From 253f9a4467289ddea453471fbfffcd6a2001dd66 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Mon, 12 Oct 2026 10:00:53 +0200 Subject: [PATCH 01/17] Java integration tests for reference chains End-to-end leak scenarios (thread-local leaks incl. late-thread and static-field-rooted leaks), leak-tag correlation across JFR round-trips, external-process launches, the search-gate behavior, reference-chain JFR parser tests, and the JavaProfiler test-seam widening they need. --- .../com/datadoghq/profiler/JavaProfiler.java | 183 ++-- .../profiler/AbstractProcessProfilerTest.java | 6 +- .../profiler/AbstractProfilerTest.java | 6 +- .../datadoghq/profiler/ExternalLauncher.java | 98 +- .../AggressiveLeakReferenceChainTest.java | 92 +- .../ExternalProcessReferenceChainTest.java | 138 +-- .../LeakTagCorrelationReferenceChainTest.java | 124 ++- .../LeakTagCorrelationScenario.java | 360 ++----- .../referencechains/LeakingCacheScenario.java | 189 ++-- .../ReferenceChainAssertions.java | 84 +- .../ReferenceChainJfrParserTest.java | 157 ++- .../ReferenceChainTestSeamsTest.java | 187 ++-- .../ReferenceChainTrackingTest.java | 898 +++++++++++++----- .../StaticFieldGrowingCollectionScenario.java | 358 ++----- .../ThreadLocalLeakReferenceChainTest.java | 64 +- .../ThreadLocalLeakScenario.java | 192 +--- 16 files changed, 1524 insertions(+), 1612 deletions(-) diff --git a/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java b/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java index ccd57efee0..6f5bd6374b 100644 --- a/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java +++ b/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java @@ -463,14 +463,15 @@ public Map getDebugCounters() { private static native int getTid0(); /** - * Test seam: returns the calling thread's profiler tid - * (ProfiledThread::currentTid()), the tid space {@code seedTidTrendSample0} matches - * against. Unlike the tracker-mutating seams it only reads thread state, so it is - * compiled unconditionally and works in release builds too. Must be called ON the - * leaking thread, or the seeded tid will match no tracked instance and no leak tag - * will be assigned. - */ - static int getTid() { + * Test seam (debug native builds only): returns the calling thread's profiler tid + * (ProfiledThread::currentTid()'s value on the native side - the same tid space + * {@code seedTidTrendSample0} matches tracked instances' allocating threads + * against). Scenarios seeding per-(klass, tid) trend ramps must call this ON + * the leaking thread and pass the result to {@code seedTidTrendSample0}, or + * the qualifying tid will match no tracked instance and no leak tag will + * ever be assigned to the scenario's real instances. + */ + public static int getTid() { return getTid0(); } @@ -544,69 +545,79 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l /** * Test seam (debug native builds only - a no-op returning {@code false}/{@code 0}/an - * empty array in release builds): lets LivenessTracker's leak-candidate detection be tested - * without depending on the probabilistic JVMTI heap sampler. + * empty array in release builds): decouples LivenessTracker's leak-candidate + * detection from ReferenceChainTracker's chain reconstruction, each independently + * verifiable end-to-end without depending on both the probabilistic JVMTI heap + * sampler and the reference-chain BFS search organically producing the right + * conditions in the same test run. *

* Enables/disables LivenessTracker's per-klass population tracking directly, * bypassing {@code initialize()}'s live-JVM requirement. Returns {@code true} on * debug builds. */ - static native boolean setGcGenerationsEnabled0(boolean enabled); + public static native boolean setGcGenerationsEnabled0(boolean enabled); /** * Test seam (debug native builds only): seeds one epoch's worth of population * history for {@code klassId} directly into LivenessTracker's ring buffer, * bypassing real allocation sampling. Repeated calls (with distinct * {@code epoch} values) build up a trend {@link #selectLeakCandidateKlassIds0()} - * can then rank. + * can then rank, letting a test assert a slope signal would be generated for a + * chosen klass id without waiting on real GC epochs. */ - static native void seedKlassPopulationSample0(int klassId, int count, long epoch); + public static native void seedKlassPopulationSample0(int klassId, int count, long epoch); /** * Test seam (debug native builds only): seeds one epoch's worth of per-tid trend * history for {@code klassId}, the (klass, tid) qualification - * selectLeakCandidates() requires on top of the klass-level ramp seeded by + * selectLeakCandidates() now requires on top of the klass-level ramp seeded by * {@link #seedKlassPopulationSample0}. Repeated calls with the same rising shape - * (and the same {@code tid}) qualify {@code tid} as a leak-site thread. {@code tid} - * must come from {@link #getTid()} whenever the scenario relies on leak tagging of - * real tracked instances. + * (and the same {@code tid}) build the sustained rise that qualifies {@code tid} + * as a leak-site thread. {@code tid} must be the leaking thread's real profiler + * tid from {@link #getTid()} whenever the scenario also relies on leak tagging + * of real tracked instances; see that method's own comment. */ - static native void seedTidTrendSample0(int klassId, int tid, int count, long epoch); + public static native void seedTidTrendSample0(int klassId, int tid, int count, long epoch); /** * Test seam (debug native builds only): wires {@code representative} in as {@code klassId}'s * leak-candidate representative directly (a fresh weak global ref owned by LivenessTracker), - * bypassing the real allocation-sampling path. Combined with - * {@link #seedKlassPopulationSample0} and {@link #tagAsReferenceChainRoot0}, lets - * {@link #pollReferenceChainTargets0()}'s bridging step run without the real sampler or - * root-seeded walk. + * bypassing the real allocation-sampling path that would otherwise populate this. Combined + * with {@link #seedKlassPopulationSample0} and {@link #tagAsReferenceChainRoot0}, lets a test + * join a synthetic slope signal to a real, directly-tagged object so + * {@link #pollReferenceChainTargets0()}'s bridging step can be exercised end-to-end with + * neither the real sampler nor the real root-seeded walk involved. */ - static native void setKlassPopulationRepresentativeForTest0(int klassId, Object representative); + public static native void setKlassPopulationRepresentativeForTest0(int klassId, Object representative); /** * Test seam (debug native builds only): clears LivenessTracker's per-klass population table, * so a later test in the same JVM does not observe leak candidates seeded by an earlier one. */ - static native void resetKlassPopulationForTest0(); + public static native void resetKlassPopulationForTest0(); /** * Test seam (debug native builds only): returns the klass ids LivenessTracker's * real leak-candidate ranking (positive population slope, top 5) currently * selects - the same call ReferenceChainTracker's restart gate and target-polling - * bridge use in production. Does not require a reference-chain search to be running. + * bridge use in production, exposed here so a test can assert a slope signal was + * generated (real or seeded via {@link #seedKlassPopulationSample0}) without + * needing a reference-chain search to also be running. */ - static native int[] selectLeakCandidateKlassIds0(); + public static native int[] selectLeakCandidateKlassIds0(); /** * Test seam (debug native builds only): tags {@code target} and inserts it * directly as a reference-chain frontier root, bypassing ReferenceChainTracker's * normal discovery path (a root-seeded FollowReferences walk) and - * LivenessTracker's leak-candidate selection entirely. Returns the assigned - * frontier tag (matching the {@code target_tag} a resulting - * {@code datadog.ReferenceChain} event reports), or {@code 0} on failure (reference - * chains disabled, or the frontier table is at capacity). + * LivenessTracker's leak-candidate selection entirely. Lets a test drive + * {@link #runReferenceChainPass0()}/{@link #pollReferenceChainTargets0()} against + * a known, caller-chosen live object. Returns the assigned frontier tag (matching + * the {@code target_tag} a resulting {@code datadog.ReferenceChain} event + * reports), or {@code 0} on failure (reference chains disabled, or the frontier + * table is at capacity). */ - static native long tagAsReferenceChainRoot0(Object target); + public static native long tagAsReferenceChainRoot0(Object target); /** * Test seam (debug native builds only): runs exactly one bounded BFS pass of the @@ -614,7 +625,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * background thread/cadence. Returns {@code false} if reference chains are * disabled or the tracker was never started. */ - static native boolean runReferenceChainPass0(); + public static native boolean runReferenceChainPass0(); /** * Test seam (debug native builds only): runs one poll of @@ -623,24 +634,26 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * {@link #runReferenceChainPass0()} walk, reconstructs and queues its chain * event, rather than waiting on the background thread's own scheduling cycle. */ - static native void pollReferenceChainTargets0(); + public static native void pollReferenceChainTargets0(); /** - * Test seam (debug native builds only): drains the reference-chain events queued by - * {@link #pollReferenceChainTargets0()} so far (the same queue {@code Profiler.dump()} drains - * in production to write {@code datadog.ReferenceChain} JFR events) and returns how many of - * them have {@code leaf}'s class as their leaf (first) hop. Chains for other targets, e.g. left - * cached by an earlier test in the same JVM, are not counted. + * Test seam (debug native builds only): drains and returns the number of + * reference-chain events queued by {@link #pollReferenceChainTargets0()} so far + * (the same queue {@code Profiler.dump()} drains in production to write + * {@code datadog.ReferenceChain} JFR events) - lets a test assert a chain was + * actually reconstructed without needing a real JFR dump. */ - static native int drainReferenceChainEventCountForLeaf0(Object leaf); + public static native int drainReferenceChainEventCount0(); /** * Test seam (debug native builds only): resets ReferenceChainTracker's search/frontier state - * back to a brand-new tracker's, releasing any tags a previous search still held. The tracker - * is a process-wide singleton and runPass() walks from the roots only once per search, so an - * in-process test needing its own root-seeded walk must call this first. + * back to a brand-new tracker's, releasing any tags a previous search still held. Since the + * tracker is a process-wide singleton, an in-process test that needs its own genuine first + * root-seeded walk (runPass() only re-walks from the roots once per search's whole lifetime) + * calls this at the start of its test body to force one, rather than depending on being the + * first reference-chain test to run in a shared test JVM. */ - static native void resetReferenceChainSearchForTest0(); + public static native void resetReferenceChainSearchForTest0(); /** * Test seam (debug native builds only): diagnostic-only, does not tag {@code target}. Reads @@ -649,52 +662,32 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * (0 = expands next) if still queued, {@code -1} if tagged but no longer queued (already * expanded), or {@code -2} if never admitted at all. */ - static native long getReferenceChainPendingPositionForTest0(Object target); + public static native long getReferenceChainPendingPositionForTest0(Object target); /** * Test seam (debug native builds only): the current size of ReferenceChainTracker's * pending-expansion queue, for computing {@link #getReferenceChainPendingPositionForTest0}'s * position as a fraction of the current backlog. */ - static native long getReferenceChainPendingSizeForTest0(); - - /** - * Test seam (-DDEBUG native builds only - debug/asan/tsan; returns -1 in release): does not - * tag {@code target}. The raw {@code FrontierEntryState} (canonical values: - * referenceChainFrontier.h) of the current search's frontier entry for target - 0 = FRONTIER - * (admitted, not yet expanded), 1 = EXPANDED, 2 = EDGE (retired: never produced by the - * production walk, so this seam does not return it in practice), 3 = ABANDONED - or - * {@code -1} if target has no frontier entry (never admitted, or still carrying only a leak - * tag). - */ - static native int getReferenceChainFrontierStateForTest0(Object target); - - /** - * Test seam (-DDEBUG native builds only - debug/asan/tsan; returns 0 in release): does not - * tag {@code target}. The targetTag the {@code datadog.ReferenceChain} event for target - * carries, if a cached chain exists for target; 0 otherwise. When target carries a frontier - * tag, only the current search's cached chain counts. When target carries a leak tag, a chain - * cached by any search generation counts, but only if it was built during target's current - * ownership of that leak tag: leak tags are recycled after their object dies, so identity is - * the (leak tag, ownership-period stamp) pair, not the tag alone. - */ - static native long getReferenceChainResolvedTargetTagForTest0(Object target); + public static native long getReferenceChainPendingSizeForTest0(); /** * Test seam (debug native builds only): seeds one heap-floor-ring sample - the input to * {@code LivenessTracker::secondsToOOM()}'s time-to-OOM projection - directly, bypassing the * real {@code GarbageCollectionFinish} callback. {@code timestampNs} values are only ever - * compared against each other, never against a real wall clock, so any strictly increasing - * sequence is valid. + * compared against each other, never against a real wall clock, so a test may use any + * self-consistent, strictly increasing sequence to build an arbitrary rising or flat + * heap-usage-over-time history without waiting on real GCs. */ - static native void heapFloorRecordForTest0(long usedBytes, long timestampNs); + public static native void heapFloorRecordForTest0(long usedBytes, long timestampNs); /** * Test seam (debug native builds only): overrides the max-heap-size {@code secondsToOOM()} - * projects against, bypassing the real {@code Runtime.maxMemory()} resolution, so the - * projection does not depend on the test JVM's {@code -Xmx}. + * projects against, bypassing the real {@code Runtime.maxMemory()} resolution - so a test can + * exercise the projection deterministically, independent of whatever {@code -Xmx} this JVM's + * own shared, no-{@code forkEvery} fork happens to run with. */ - static native void setMaxHeapBytesForTest0(long maxHeapBytes); + public static native void setMaxHeapBytesForTest0(long maxHeapBytes); /** * Test seam (debug native builds only): temporarily disables {@code onGC()}'s own @@ -703,49 +696,27 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * with a real {@code OS::nanotime()} timestamp and real heap usage, corrupting * {@code secondsToOOM()}'s projection. Pass {@code false} to disable, {@code true} to restore. */ - static native void setHeapFloorRecordingForTest0(boolean enabled); - - /** - * Test seam (debug native builds only): clears the heap-floor ring seeded via - * {@link #heapFloorRecordForTest0(long, long)} so the next test in the same JVM does not - * inherit this test's samples into its {@code secondsToOOM()} projection. Must be called - * while heap-floor recording is disabled (i.e. before the - * {@link #setHeapFloorRecordingForTest0(boolean)} restore in a finally block) - the seam - * asserts when called while recording is enabled, because a concurrent sample cannot be - * excluded from the two non-atomic index stores otherwise. - */ - static native void heapFloorResetForTest0(); - - /** - * Test seam (debug native builds only): reports whether the seeded heap-floor ring - * currently shows a sustained rise ({@code heapFloorRising()}) - the aggregate growth - * read {@code hasLeakSignal()}'s gate uses alongside {@code secondsToOOM()}'s urgent - * projection. Returns {@code false} both before any seeding and after - * {@link #heapFloorResetForTest0()} emptied the ring, which is how tests assert the - * reset actually cleared the indices. - */ - static native boolean heapFloorRisingForTest0(); + public static native void setHeapFloorRecordingForTest0(boolean enabled); /** * Test seam (debug native builds only): reports whether ReferenceChainTracker's search-restart * gate ({@code canAffordNewSearch()} -> {@code hasLeakSignal()}) would currently allow a * fresh/terminal search to start - in particular, whether {@code secondsToOOM()}'s urgent-OOM - * bypass opens this gate even with zero per-klass leak candidates. Unlike - * {@link #runReferenceChainPass0()}, which calls {@code runPass()} unconditionally, this - * evaluates the gate without running a pass. This is not a read-only query: under the native - * engine lock it may account a completed search's pain and restart/reset terminal search - * state. + * bypass opens this gate even with zero per-klass leak candidate (confirmable in the same test + * via {@link #selectLeakCandidateKlassIds0()}). Unlike {@link #runReferenceChainPass0()}, which + * calls {@code runPass()} unconditionally, this reads the gate itself without running a pass. */ - static native boolean shouldRunPassForTest0(); + public static native boolean shouldRunPassForTest0(); /** * Test seam (debug native builds only): the number of BFS passes run for the current/most - * recent reference-chain search. Waiting for it to advance past the value read before creating - * an object guarantees a later match came from a pass whose {@code expandFrontier()} (and - * therefore {@code collectStaleExpandedEntriesForRotation()}) ran strictly after the object - * existed, not from a pass racing its creation. + * recent reference-chain search. Lets a test note this count before creating an object, then + * wait for it to advance before trusting a match against that object - the only way to be + * certain the match came from a pass whose own {@code expandFrontier()} (and therefore {@code + * collectStaleExpandedEntriesForRotation()}) ran strictly after the object existed, rather + * than from the same pass racing the object's creation. */ - static native int referenceChainPassesRunForTest0(); + public static native int referenceChainPassesRunForTest0(); // ---- Test-only reads of the current thread's OTEP record ---------------------------------- // Each resolves the current carrier's record directly (like the write primitives above) with diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProcessProfilerTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProcessProfilerTest.java index e0f79c7046..78ea02983f 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProcessProfilerTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProcessProfilerTest.java @@ -60,8 +60,10 @@ protected final LaunchResult launch(String target, List jvmArgs, String /** * Same as the 6-arg overload above, but with a caller-supplied wait timeout instead of the - * default 10 seconds, for child scenarios that run substantially longer than an attach/init - * check. + * hardcoded 10 seconds - needed by scenarios that run substantially longer than a plain + * attach/init check, e.g. {@code ExternalProcessReferenceChainTest}'s population-growth loop + * (up to 25 rounds plus a grace period, ~20s+ observed in-process, plus a whole separate + * JVM's own startup/classloading cost on top). */ protected final LaunchResult launch(String target, List jvmArgs, String commands, Map env, long timeoutSeconds, Function onStdoutLine, Function onStderrLine) throws Exception { String javaHome = System.getenv("JAVA_TEST_HOME"); diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProfilerTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProfilerTest.java index acecb8fef4..7e2f880f08 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProfilerTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProfilerTest.java @@ -74,8 +74,10 @@ public static double scaledSize(JfrEvent item) { protected JavaProfiler profiler; private Path jfrDump; - // Set before getProfilerCommand() is consulted, so a subclass can vary its - // command per @Test method instead of needing one test class per configuration. + // Set at the very start of setupProfiler(), before getProfilerCommand() is + // consulted, so a subclass can branch its command on the current test + // method (e.g. distinct hop/budget/frontier-cap values per @Test) without + // needing separate test classes per configuration. protected TestInfo testInfo; private Duration cpuInterval; diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java b/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java index 6681ddc1d8..419c064432 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java @@ -39,17 +39,23 @@ *

  • leak-cache "<start command>|||<scratch dump path>" - starts the profiler with * the given start command, then runs {@link LeakingCacheScenario} in this process and exits * directly (no readiness/stdin-signal handshake, unlike the other modes above) once it - * prints its one result line. Used by {@code ExternalProcessReferenceChainTest}; a separate - * JVM is required because the one-shot root-seeded BFS walk is a process-wide, once-ever - * resource.
    • + * prints its one result line. Used by {@code ExternalProcessReferenceChainTest} + * (referencechains package) to prove the reference-chains mechanism end-to-end against a + * genuinely separate JVM, not the in-process dynamic-attach lifecycle every other test in + * this module uses - see that scenario's own class comment for why a *separate* process is + * load-bearing here (the one-shot root-seeded BFS walk is a process-wide, once-ever + * resource). *
  • leak-static-field "<start command>|||<scratch dump path>" - same packing and * lifecycle as {@code leak-cache} above, but runs {@link StaticFieldGrowingCollectionScenario} * instead: a {@code static final List} field appended to (never reassigned) after - * its owning class has already been swept once by {@code admitStaticFieldRoots()}.
    • + * its owning class has already been swept once by {@code admitStaticFieldRoots()} - + * mirroring the real leak generator found in the {@code prof-analyzer-hotdog-jb} pod. *
  • leak-correlation "<start command>|||<scratch dump path>" - same packing and * lifecycle as {@code leak-cache} above, but runs {@link LeakTagCorrelationScenario} - * instead, asserting the emitted chain's targetTag is a leak-tag-pool tag matching a - * HeapLiveObject's leakTag.
    • + * instead: a static-collection leak coexisting with ephemeral stack-local noise of another + * class and a large live filler graph, asserting the emitted chain's targetTag is a + * leak-tag-pool tag matching a HeapLiveObject's leakTag - the chain-to-live-heap-sample + * correlation use case. * */ public class ExternalLauncher { @@ -236,50 +242,84 @@ public static void main(String[] args) throws Exception { } } } else if (args[0].equals("leak-cache")) { - String[] packed = unpackScenarioArgs("leak-cache", args); - String commands = packed[0]; - String scratchPath = packed[1]; + // "|||" packed into one args[1] string rather + // than extending AbstractProcessProfilerTest.launch()'s generic 2-arg + // (target, commands) contract with a 3rd argument every other mode would have to + // ignore. + String packed = args.length == 2 ? args[1] : ""; + int sep = packed.indexOf("|||"); + if (sep < 0) { + throw new IllegalArgumentException( + "leak-cache requires \"|||\", got: " + packed); + } + String commands = packed.substring(0, sep); + String scratchPath = packed.substring(sep + "|||".length()); JavaProfiler instance = JavaProfiler.getInstance(); - // run() starts the profiler itself: it must seed its cache fixture first. + // LeakingCacheScenario.run() itself calls instance.execute(commands), not here - + // it needs to seed its cache fixture *before* starting the profiler (see that + // method's own comment for why). LeakingCacheScenario.run(instance, commands, Paths.get(scratchPath)); System.out.flush(); - // Skips the "[ready]" + stdin handshake below: the mode is one-shot and its - // result line has already been printed. + // Deliberately exits here rather than falling through to the shared + // "[ready]" + stdin-signal handshake below: this mode runs to completion in one + // shot (no live back-and-forth with the parent needed) and its own result line + // has already been printed by LeakingCacheScenario.run(). System.exit(0); } else if (args[0].equals("leak-static-field")) { - // Same packing as leak-cache (unpackScenarioArgs()). - String[] packed = unpackScenarioArgs("leak-static-field", args); - String commands = packed[0]; - String scratchPath = packed[1]; + // Same "|||" packing as leak-cache above. + String packed = args.length == 2 ? args[1] : ""; + int sep = packed.indexOf("|||"); + if (sep < 0) { + throw new IllegalArgumentException( + "leak-static-field requires \"|||\", got: " + packed); + } + String commands = packed.substring(0, sep); + String scratchPath = packed.substring(sep + "|||".length()); JavaProfiler instance = JavaProfiler.getInstance(); StaticFieldGrowingCollectionScenario.run(instance, commands, Paths.get(scratchPath)); System.out.flush(); System.exit(0); } else if (args[0].equals("leak-correlation")) { - // Same packing as leak-cache (unpackScenarioArgs()). - String[] packed = unpackScenarioArgs("leak-correlation", args); - String commands = packed[0]; - String scratchPath = packed[1]; + // Same "|||" packing as leak-cache above. + String packed = args.length == 2 ? args[1] : ""; + int sep = packed.indexOf("|||"); + if (sep < 0) { + throw new IllegalArgumentException( + "leak-correlation requires \"|||\", got: " + packed); + } + String commands = packed.substring(0, sep); + String scratchPath = packed.substring(sep + "|||".length()); JavaProfiler instance = JavaProfiler.getInstance(); LeakTagCorrelationScenario.run(instance, commands, Paths.get(scratchPath)); System.out.flush(); System.exit(0); } else if (args[0].equals("threadlocal-leak")) { - // Same packing as leak-cache (unpackScenarioArgs()). - String[] packed = unpackScenarioArgs("threadlocal-leak", args); - String commands = packed[0]; - String scratchPath = packed[1]; + // Same "|||" packing as leak-cache above. + String packed = args.length == 2 ? args[1] : ""; + int sep = packed.indexOf("|||"); + if (sep < 0) { + throw new IllegalArgumentException( + "threadlocal-leak requires \"|||\", got: " + packed); + } + String commands = packed.substring(0, sep); + String scratchPath = packed.substring(sep + "|||".length()); JavaProfiler instance = JavaProfiler.getInstance(); ThreadLocalLeakScenario.run(instance, commands, Paths.get(scratchPath)); System.out.flush(); System.exit(0); } else if (args[0].equals("threadlocal-leak-late")) { // Same packing as threadlocal-leak, but the leak thread is - // started only AFTER the recording began, exercising - // Profiler::onThreadStart's registerThreadObject() wiring. - String[] packed = unpackScenarioArgs("threadlocal-leak-late", args); - String commands = packed[0]; - String scratchPath = packed[1]; + // started only AFTER the recording began - the regression + // shape for Profiler::onThreadStart's registerThreadObject() + // wiring (ThreadLocalLeakScenario.run()'s lateThread comment). + String packed = args.length == 2 ? args[1] : ""; + int sep = packed.indexOf("|||"); + if (sep < 0) { + throw new IllegalArgumentException( + "threadlocal-leak-late requires \"|||\", got: " + packed); + } + String commands = packed.substring(0, sep); + String scratchPath = packed.substring(sep + "|||".length()); JavaProfiler instance = JavaProfiler.getInstance(); ThreadLocalLeakScenario.run(instance, commands, Paths.get(scratchPath), true); System.out.flush(); diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java index db78767791..8cc7f9a440 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java @@ -6,7 +6,7 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.AbstractProfilerTest; -import com.datadoghq.profiler.ReferenceChainTestHooks; +import com.datadoghq.profiler.JavaProfiler; import com.datadoghq.profiler.Platform; import org.junit.jupiter.api.Test; @@ -56,9 +56,9 @@ protected boolean isPlatformSupported() { } private static void assumeDebugBuild() { - assumeTrue(ReferenceChainAssertions.isDebugInstrumentedBuild(), + assumeTrue("debug".equals(System.getProperty("ddprof_test.config")), "heapFloorRecordForTest0/setMaxHeapBytesForTest0/shouldRunPassForTest0 only exist in a " - + "-DDEBUG native build - debug/asan/tsan (javaApi.cpp's #ifdef DEBUG guard)"); + + "debug native build (javaApi.cpp's #ifdef DEBUG guard)"); } /** @@ -82,50 +82,44 @@ private static void assumeDebugBuild() { public void shouldOpenSearchGateOnAggressiveHeapWideGrowthWithNoLeakCandidate() throws InterruptedException { assumeDebugBuild(); - ReferenceChainTestHooks.setHeapFloorRecordingForTest0(false); - ReferenceChainTestHooks.resetKlassPopulationForTest0(); - ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); + JavaProfiler.setHeapFloorRecordingForTest0(false); + JavaProfiler.resetKlassPopulationForTest0(); + JavaProfiler.resetReferenceChainSearchForTest0(); try { - // Baseline BEFORE publishing any urgency input: the live BFS thread may run the one - // urgency-authorized search as soon as the samples below land, and that pass must count. - int passesBefore = ReferenceChainTestHooks.referenceChainPassesRunForTest0(); // 1000 MiB fake max heap, rising from 100 MiB to 991 MiB over 9 (fake) seconds: ~99 MiB/s, // 9 MiB of headroom left at the last sample -> projected time-to-OOM ~= 9/99 s, far under // OOM_URGENT_THRESHOLD_S = 300s. - ReferenceChainTestHooks.setMaxHeapBytesForTest0(1000L * 1024 * 1024); + JavaProfiler.setMaxHeapBytesForTest0(1000L * 1024 * 1024); for (int i = 0; i < 10; i++) { long usedBytes = (100L + i * 99L) * 1024 * 1024; long timestampNs = i * 1_000_000_000L; - ReferenceChainTestHooks.heapFloorRecordForTest0(usedBytes, timestampNs); + JavaProfiler.heapFloorRecordForTest0(usedBytes, timestampNs); } - int[] candidates = ReferenceChainTestHooks.selectLeakCandidateKlassIds0(); + int[] candidates = JavaProfiler.selectLeakCandidateKlassIds0(); assertTrue(candidates == null || candidates.length == 0, "This test's own precondition: no per-klass candidate should exist, so passes running " + "below can only come from the aggregate urgent-OOM bypass"); + int passesBefore = JavaProfiler.referenceChainPassesRunForTest0(); // Idle BFS cadence is ~1s/pass; urgency ramps it to ~10ms after the latch. 20s covers the // first evaluation landing up to one idle cadence after the seeding loop. long deadline = System.currentTimeMillis() + 20_000; - while (ReferenceChainTestHooks.referenceChainPassesRunForTest0() == passesBefore + while (JavaProfiler.referenceChainPassesRunForTest0() == passesBefore && System.currentTimeMillis() < deadline) { Thread.sleep(50); } - assertTrue(ReferenceChainTestHooks.referenceChainPassesRunForTest0() > passesBefore, + assertTrue(JavaProfiler.referenceChainPassesRunForTest0() > passesBefore, "Expected the BFS thread to run passes from the urgent heap-wide OOM projection alone, " + "with zero per-klass leak candidate"); - candidates = ReferenceChainTestHooks.selectLeakCandidateKlassIds0(); + candidates = JavaProfiler.selectLeakCandidateKlassIds0(); assertTrue(candidates == null || candidates.length == 0, "The passes that just ran must still have had zero per-klass candidates - the " + "aggregate urgent-OOM projection was the only possible trigger"); } finally { - // Reset the ring while recording is still disabled so the restore below cannot - // let a real GC interleave a sample with the reset, and so the next test in this - // JVM does not inherit this test's seeded samples into its secondsToOOM(). - ReferenceChainTestHooks.heapFloorResetForTest0(); - ReferenceChainTestHooks.setMaxHeapBytesForTest0(-1); - ReferenceChainTestHooks.setHeapFloorRecordingForTest0(true); + JavaProfiler.setMaxHeapBytesForTest0(-1); + JavaProfiler.setHeapFloorRecordingForTest0(true); } } @@ -138,63 +132,25 @@ public void shouldOpenSearchGateOnAggressiveHeapWideGrowthWithNoLeakCandidate() @Test public void shouldNotOpenSearchGateOnFlatHeapFloorWithNoLeakCandidate() { assumeDebugBuild(); - ReferenceChainTestHooks.setHeapFloorRecordingForTest0(false); - ReferenceChainTestHooks.resetKlassPopulationForTest0(); - ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); + JavaProfiler.setHeapFloorRecordingForTest0(false); + JavaProfiler.resetKlassPopulationForTest0(); + JavaProfiler.resetReferenceChainSearchForTest0(); try { - ReferenceChainTestHooks.setMaxHeapBytesForTest0(1000L * 1024 * 1024); + JavaProfiler.setMaxHeapBytesForTest0(1000L * 1024 * 1024); for (int i = 0; i < 10; i++) { - ReferenceChainTestHooks.heapFloorRecordForTest0(200L * 1024 * 1024, i * 1_000_000_000L); + JavaProfiler.heapFloorRecordForTest0(200L * 1024 * 1024, i * 1_000_000_000L); } - int[] candidates = ReferenceChainTestHooks.selectLeakCandidateKlassIds0(); + int[] candidates = JavaProfiler.selectLeakCandidateKlassIds0(); assertTrue(candidates == null || candidates.length == 0, "This test's own precondition: no per-klass candidate should exist either"); - assertFalse(ReferenceChainTestHooks.shouldRunPassForTest0(), + assertFalse(JavaProfiler.shouldRunPassForTest0(), "Expected the search-restart gate to stay closed: no heap growth and no per-klass " + "candidate give hasLeakSignal() nothing to trust"); } finally { - // Same order as the seeding test above: ring reset first, still disabled. - ReferenceChainTestHooks.heapFloorResetForTest0(); - ReferenceChainTestHooks.setMaxHeapBytesForTest0(-1); - ReferenceChainTestHooks.setHeapFloorRecordingForTest0(true); - } - } - - /** - * Kills a no-op'd {@code heapFloorResetForTest0()} mutation: every other call site resets in - * a finally block that no assertion observes, so without this test a reset whose body was - * dropped (or whose JNI entry was left as the release stub) would leave the whole suite - * green while leaking one test's seeded samples into the next test's JVM. The rising-then- - * empty pair is asserted directly through {@code heapFloorRising()} - the same read the - * aggregate gate uses - so the reset's effect is checked, not assumed. - */ - @Test - public void shouldEmptyHeapFloorRingOnReset() { - assumeDebugBuild(); - ReferenceChainTestHooks.setHeapFloorRecordingForTest0(false); - ReferenceChainTestHooks.resetKlassPopulationForTest0(); - ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); - try { - // Same rising seeds as shouldOpenSearchGateOnAggressiveHeapWideGrowthWithNoLeakCandidate: - // 100 MiB to 991 MiB over 9 fake seconds, which clears heapFloorRising()'s growth and - // floor bars at exactly the min-fill trend window (fill = 10 samples). - for (int i = 0; i < 10; i++) { - long usedBytes = (100L + i * 99L) * 1024 * 1024; - long timestampNs = i * 1_000_000_000L; - ReferenceChainTestHooks.heapFloorRecordForTest0(usedBytes, timestampNs); - } - assertTrue(ReferenceChainTestHooks.heapFloorRisingForTest0(), - "Precondition: the seeded samples must read as a sustained rise before the reset"); - ReferenceChainTestHooks.heapFloorResetForTest0(); - assertFalse(ReferenceChainTestHooks.heapFloorRisingForTest0(), - "heapFloorResetForTest0() must empty the ring: fill = 0 falls below the min-fill " - + "trend gate heapFloorRising() requires"); - } finally { - // Same order as the other tests: ring reset first, still disabled. - ReferenceChainTestHooks.heapFloorResetForTest0(); - ReferenceChainTestHooks.setHeapFloorRecordingForTest0(true); + JavaProfiler.setMaxHeapBytesForTest0(-1); + JavaProfiler.setHeapFloorRecordingForTest0(true); } } } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java index 55da7b61ff..cb91ad34f8 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java @@ -12,7 +12,6 @@ import java.nio.file.Files; import java.nio.file.Path; -import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.concurrent.atomic.AtomicReference; @@ -23,20 +22,30 @@ import static org.junit.jupiter.api.Assumptions.assumeFalse; /** - * Separate-process end-to-end coverage for the reference-chains target-selection mechanism, - * complementing {@link ReferenceChainTrackingTest}'s in-process coverage: runs a "leaking Java - * app" (see {@link LeakingCacheScenario}) in a child JVM and asserts on the child's reported - * result. + * Genuinely separate-process end-to-end coverage for the reference-chains target-selection + * mechanism, complementing {@link ReferenceChainTrackingTest}'s in-process coverage: runs a real + * "leaking Java app" (an ever-growing, never-evicted {@code HashMap}-backed cache - see + * {@link LeakingCacheScenario}) in a genuinely separate child JVM, launched the same way + * {@code JavaProfilerTest}/{@code JVMAccessTest} already launch child processes, and asserts on + * that child's own reported result rather than reading a JFR file back out of this test's own + * process. * *

    Why a separate process, not another {@code @Test} in {@code ReferenceChainTrackingTest}: + * an earlier attempt added a second success-path {@code @Test} method there, using this exact + * same {@code HashMap}-based leak shape, sharing that class's in-process {@code AbstractProfilerTest} + * dynamic-attach lifecycle. It failed reliably whenever it ran after + * {@code ReferenceChainTrackingTest}'s own {@code ChainLink} test in the same JVM - not a + * test-ordering bug, but a genuine, non-obvious property of {@code ReferenceChainTracker}: * {@code runPass()} (referenceChains.cpp) performs exactly one root-seeded {@code FollowReferences} * walk per search's *entire lifetime* ({@code _search_started}); every later pass only expands * frontier entries that walk already discovered ({@code expandFrontier()}) - it never * re-examines GC roots or revisits an already-{@code EXPANDED} entry for newly-added children. - * Since {@code ReferenceChainTracker} is a process-wide singleton, only the *first* test to call - * {@code runPass()} in a given JVM gets a root-seeded walk; later tests' independently-rooted - * locals are invisible to it. A child JVM per scenario gets its own fresh singleton and - * therefore its own first root walk. + * Since {@code ReferenceChainTracker} is a process-wide singleton, only the *first* test to ever + * call {@code runPass()} in a given JVM gets a real root-seeded walk; every subsequent test's own, + * independently-rooted local variables are structurally invisible to the mechanism afterward, no + * matter how they are built. A genuinely separate child JVM per scenario sidesteps this + * entirely: each process gets its own fresh {@code ReferenceChainTracker} singleton, and + * therefore its own guaranteed first-ever root walk. */ @Tag("slow") public class ExternalProcessReferenceChainTest extends AbstractProcessProfilerTest { @@ -53,39 +62,50 @@ void shouldReconstructReferrerChainInSeparateProcess() throws Exception { // LeakingCacheScenario.run() (inside the child) creates this file on its own first dump() - // an empty placeholder here would make that first dump() attempt fail confusingly. Files.deleteIfExists(scratchDumpPath); - // "start" requires a "jfr,file=..." clause (JavaProfiler.execute() throws "Flight Recorder - // output file is not specified" without one) even though its content is never read. + // "start" requires a "jfr,file=..." clause (found the hard way: JavaProfiler.execute() + // throws "Flight Recorder output file is not specified" without one) even though this + // scenario never reads its content - only the explicit dump() calls + // LeakingCacheScenario.run() makes to scratchDumpPath matter. Path continuousJfrPath = Files.createTempFile("referencechains-external-process-continuous", ".jfr"); try { - // budget=200000 (up from the in-process test's 4000): a cold external JVM's - // reachable-from-roots graph (full JUnit/JMC/Gradle-worker classpath) is far larger than - // the in-process test's, and each pass's JVMTI walk cost scales with cumulative frontier - // size - budget=4000 stayed truncated=1 at 76000+ admitted edges after 19 passes and never - // reached the cache before timeout. _budget is the pacing controller's hard ceiling (see - // updatePacing(), referenceChains.cpp) - pausetarget only paces *within* it. - // memory=64:l:1.0 - the 100% live-sample ratio removes the default 10% subsampling - // lottery from the tracked-instance pool; total volume stays capped by the 256KiB - // interval floor, so the tracking table remains tiny. + // budget=200000 (up from the in-process test's 4000, found via TEST_LOG instrumentation + // in referenceChains.cpp/livenessTracker.cpp): a genuinely fresh external JVM's + // reachable-from-roots graph (full JUnit/JMC/Gradle-worker classpath, bootstrapped from + // scratch - no benefit from a warm, already-running shared worker JVM) is far larger than + // the in-process test's, and each pass's own JVMTI walk cost scales with cumulative + // frontier size, not with this scenario's own allocation rate - budget=4000 stayed + // truncated=1 at 76000+ admitted edges after 19 real passes and never got close to this + // scenario's own cache before the test's own timeout. _budget is the pacing controller's + // hard ceiling (see updatePacing()'s own comment, referenceChains.cpp) - pausetarget alone + // cannot compensate for a ceiling set too low, only pacing *within* it. + // memory=64:l:1.0 - the explicit 100% live-sample ratio removes the + // default 10% subsampling lottery from the tracked-instance pool + // (see LeakTagCorrelationReferenceChainTest's own comment for the + // full analysis); total volume stays capped by the 256KiB interval + // floor, so the tracking table remains tiny. String startCommand = "start,memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=200000:ttl=120000:framecap=2000000:pausetarget=60000" + ",jfr,file=" + continuousJfrPath.toAbsolutePath(); - // Packed into one args[1] string to avoid extending AbstractProcessProfilerTest.launch()'s - // generic (target, commands) contract with a 3rd argument. + // Packed into one args[1] string - see ExternalLauncher's own "leak-cache" mode comment + // for why (avoids extending AbstractProcessProfilerTest.launch()'s generic (target, + // commands) contract with a 3rd argument every other mode would have to ignore). String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); - // ddprof_test.config is set on the Test task by ProfilerTestPlugin.kt and is not inherited - // by a ProcessBuilder-launched child; the scenario needs it for its debug-only seeding. - // requiredTestConfig() also fails loud when the property is unset instead of forwarding - // the literal "null", which the child would classify as a release build. + // Propagates this JVM's own ddprof_test.config (set by ProfilerTestPlugin.kt on the + // ddprof-test Test task itself, not inherited by a ProcessBuilder-launched child on its + // own) so LeakingCacheScenario can use the same debug-only seeded-representative fallback + // ReferenceChainTrackingTest already relies on instead of depending purely on real + // allocation-sampling timing. List jvmArgs = Collections.singletonList( - "-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); + "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); AtomicReference resultLine = new AtomicReference<>(); LaunchResult result = launch("leak-cache", jvmArgs, packedCommand, Collections.emptyMap(), - // Generous: a separate JVM's startup/classloading cost on top of the up-to-25-round - // growth loop plus grace period (~20s in-process). - childTimeoutSeconds(90), + // Generous: a whole separate JVM's startup/classloading cost, on top of the same + // up-to-25-round population-growth loop plus grace period that takes ~20s in-process + // (ReferenceChainTrackingTest's own history). + 90, line -> { if (line.startsWith(LeakingCacheScenario.FOUND_MARKER) || line.equals(LeakingCacheScenario.NOT_FOUND_MARKER) @@ -116,10 +136,12 @@ void shouldReconstructReferrerChainInSeparateProcess() throws Exception { * Mirrors {@link #shouldReconstructReferrerChainInSeparateProcess()}, but against {@link * StaticFieldGrowingCollectionScenario} instead of {@link LeakingCacheScenario}: a {@code * static final List} field appended to (never reassigned) after its owning class has - * already been swept once by {@code admitStaticFieldRoots()} (referenceChains.cpp), as opposed - * to {@code LeakingCacheScenario}'s local-variable (stack-root) cache. Checks that - * {@code collectStaleExpandedEntriesForRotation()} re-expands an already-{@code EXPANDED} - * static-field-rooted collection to pick up elements added after its one-time sweep. + * already been swept once by {@code admitStaticFieldRoots()} (referenceChains.cpp) - the exact + * shape found in the {@code prof-analyzer-hotdog-jb} pod's real leak generator, as opposed to + * {@code LeakingCacheScenario}'s local-variable (stack-root) cache. Local, fast reproduction of + * whether {@code collectStaleExpandedEntriesForRotation()}'s rotation mechanism actually + * re-expands an already-{@code EXPANDED} static-field-rooted collection to pick up elements + * added after its one-time sweep. */ @Test void shouldReconstructReferrerChainForGrowingStaticFieldCollection() throws Exception { @@ -131,47 +153,34 @@ void shouldReconstructReferrerChainForGrowingStaticFieldCollection() throws Exce Files.deleteIfExists(scratchDumpPath); Path continuousJfrPath = Files.createTempFile("referencechains-static-field-external-process-continuous", ".jfr"); try { - // budget/pausetarget/memory: see shouldReconstructReferrerChainInSeparateProcess(). - // painbudget=100 - the safepoint pain budget exists to protect a production - // app from back-to-back expensive passes, but here it starves the engine - // on a loaded box: a cold external JVM's search costs seconds of measured - // safepoint pain, the default cap (5% of wall-clock) clears that debt in - // ~a minute, and the tail then watches a terminal engine with all tags - // released and no new search for its whole window (observed as 1900+ - // consecutive blocked-iteration evaluations and the watched chunk reading - // tag=0 at every poll - the pass/fail line between otherwise identical - // runs). 100% only lets debt clear as fast as it accrues; cadence stays - // bounded by each search's own ~seconds of work, so this cannot spin. + // See ExternalProcessReferenceChainTest.shouldReconstructReferrerChainInSeparateProcess()'s + // own comment for why budget/pausetarget are raised this far above the in-process test's + // defaults for a genuinely fresh, cold external JVM. + // memory=64:l:1.0 - the explicit 100% live-sample ratio removes the + // default 10% subsampling lottery from the tracked-instance pool + // (see LeakTagCorrelationReferenceChainTest's own comment for the + // full analysis); total volume stays capped by the 256KiB interval + // floor, so the tracking table remains tiny. String startCommand = "start,memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=200000:ttl=120000:framecap=2000000:pausetarget=60000" - + ":painbudget=100" + ",jfr,file=" + continuousJfrPath.toAbsolutePath(); String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); - List jvmArgs = new ArrayList<>(); - jvmArgs.add("-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); - // --add-opens: the scenario reflects into Collections$SynchronizedList.list and - // ArrayList.elementData to check its holders' expansion state before creating lateChunk. - // JDK 8 has no module system (that reflection needs no opening) and rejects the option. - if (Platform.isJavaVersionAtLeast(9)) { - jvmArgs.add("--add-opens=java.base/java.util=ALL-UNNAMED"); - } + List jvmArgs = Collections.singletonList( + "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); AtomicReference resultLine = new AtomicReference<>(); - AtomicReference seamPathLine = new AtomicReference<>(); LaunchResult result = launch("leak-static-field", jvmArgs, packedCommand, Collections.emptyMap(), // Wider than shouldReconstructReferrerChainInSeparateProcess()'s 90s: this scenario's // own tail wait (StaticFieldGrowingCollectionScenario.run()) needs up to ~60s on top of // the round loop for a cold JVM's first full pass to actually complete - see that // method's own comment. - childTimeoutSeconds(150), + 150, line -> { if (line.startsWith(StaticFieldGrowingCollectionScenario.FOUND_MARKER) || line.equals(StaticFieldGrowingCollectionScenario.NOT_FOUND_MARKER)) { resultLine.set(line); - } else if (line.startsWith(StaticFieldGrowingCollectionScenario.SEAM_PATH_MARKER)) { - seamPathLine.set(line); } return LineConsumerResult.CONTINUE; }, @@ -179,17 +188,14 @@ void shouldReconstructReferrerChainForGrowingStaticFieldCollection() throws Exce assertTrue(result.inTime, "Child process did not exit within the wait timeout"); assertEquals(0, result.exitCode, "Child process exited with a non-zero code"); - // The scenario's native test seams are compiled into every -DDEBUG build (debug/asan/tsan), - // so the strong seam path must be taken on exactly those configs - the same single - // encoding the child itself uses, not an independent string match here. - boolean expectSeams = ReferenceChainAssertions.isDebugInstrumentedBuild(); - assertEquals(StaticFieldGrowingCollectionScenario.SEAM_PATH_MARKER + expectSeams, - seamPathLine.get(), - "scenario's seam-path predicate must match the native -DDEBUG build set"); assertNotNull(resultLine.get(), "Child process never printed a recognizable result marker on stdout"); assertEquals( - // "byte[]", not "[B": JMC's IMCType renders array types in Java source notation. + // "byte[]", not byte[].class.getName()'s "[B": StaticFieldGrowingCollectionScenario + // prints match.chain.get(0).getFullName(), and JMC's IMCType renders array types in + // Java source notation, not JVM signature notation - see + // ReferenceChainAssertions.jmcStyleName()'s own comment for why matching required the + // same distinction. StaticFieldGrowingCollectionScenario.FOUND_MARKER + "byte[]", resultLine.get(), "Expected a successfully reconstructed chain to a byte[] chunk appended to the static " diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java index d292f78753..656be82fa1 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java @@ -17,18 +17,14 @@ import java.util.Collections; import java.util.Deque; import java.util.List; -import java.util.Map; import java.util.concurrent.atomic.AtomicBoolean; import java.util.concurrent.atomic.AtomicReference; -import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_BASE; -import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_POOL_SIZE; import static org.junit.jupiter.api.Assertions.assertEquals; import static org.junit.jupiter.api.Assertions.assertNotNull; import static org.junit.jupiter.api.Assertions.assertTrue; import static org.junit.jupiter.api.Assertions.fail; import static org.junit.jupiter.api.Assumptions.assumeFalse; -import static org.junit.jupiter.api.Assumptions.assumeTrue; /** * End-to-end coverage of the leak-tag correlation use case in a genuinely separate child @@ -39,31 +35,39 @@ * AND matches a {@code datadog.HeapLiveObject}'s {@code leakTag}. See * {@link LeakTagCorrelationScenario}'s own header for what each ingredient reproduces. * - *

    Diagnostics on failure: the child's {@code TEST_LOG} stream (queue depths, batch - * sizes, interception counts) arrives on this process's stdout consumer. A failing run embeds - * a filtered tail of it in the assertion message, so the failure mode is diagnosable from the - * test report alone. + *

    Diagnostics on failure: unlike the pod-debugging loop this scenario exists to + * replace, the child's {@code TEST_LOG} stream (queue depths, batch sizes, interception + * counts - the same evidence collected off a live pod's logs) arrives on this process's + * stdout consumer. A failing run embeds a filtered tail of it in the assertion message, so + * the failure mode is diagnosable without redeploying anything. */ @Tag("slow") public class LeakTagCorrelationReferenceChainTest extends AbstractProcessProfilerTest { + // Mirrored from referenceChains.h (LEAK_TAG_BASE/LEAK_TAG_POOL_SIZE) - the contract under + // test, asserted against the runtime event values the child reports. + private static final long LEAK_TAG_BASE = 0x40000000L; + private static final long LEAK_TAG_POOL_SIZE = 256; + @Test void shouldCorrelateLeakChainTargetTagWithLiveObjectLeakTag() throws Exception { assertCorrelationFound("pausetarget=60000"); } /** - * The tight-window variant of the correlation use case: the same scenario under a tight - * pass window (pausetarget in single-digit ms, narrower than a large tag map's - * GetObjectsWithTags cost floor). Full correlation cannot be the pass criterion at this - * window width: the scenario's trend gates are tuned for the loose window's crawl/GC - * interleaving, and under tight windows the leak klass's real-fold trend can flip within a - * single run (chains arrive via the plain crawl path while pool tagging/interception loses - * the race, reported as [correlation-tag-out-of-pool]). What this variant asserts - * deterministically is the machinery the window exists to exercise: the leak-accumulation - * rotation must engage and select FRONTIER-state (un-expanded backlog) holders. Without - * that, the rotation tier selects nothing while known parent candidates pile up in the - * backlog. GetObjectsWithTags batch control is + * The pod-regime variant of the correlation use case: the same scenario under a + * pod-like tight pass window (pausetarget in single-digit ms, as on the production-like + * pod whose expand window was ~10ms against a 14-41ms GetObjectsWithTags floor at a + * 242k-entry tag map, ev-leaktag-onpod-round4). Full correlation cannot be the pass + * criterion at this window width: the scenario's trend gates were tuned for the loose + * window's crawl/GC interleaving, and under tight windows the leak klass's real-fold + * trend can flip within a single run - the same knife-edge the pod itself lives on + * (chains arrive via the plain crawl path while pool tagging/interception loses the + * race; observed: [correlation-tag-out-of-pool] with zero interceptions). What CAN be + * asserted deterministically here is the machinery this window exists to exercise: + * the leak-accumulation rotation must engage and select FRONTIER-state (un-expanded + * backlog) holders - the round-4 fix whose absence made that tier select zero on the + * pod while holding 51k known parent candidates. GetObjectsWithTags batch control is * covered unit-level (gotwWindowNs() widening): a real child JVM's local tag map * (~100k filler) keeps the per-call floor under the nominal window, so the widening * regime cannot be reproduced end-to-end locally without a 242k-entry tag map. @@ -73,6 +77,11 @@ void shouldRotateFrontierLeakHoldersUnderPodLikeTightWindows() throws Exception assertCorrelationFound("pausetarget=10", /*requireFrontierRotation=*/ true); } + /** + * Drives the leak-correlation child JVM and asserts the correlated chain, with the + * referencechains pausetarget given by {@code pauseTargetOption} (everything else held + * fixed across the two callers so the variant differs in exactly the pass-window regime). + */ private void assertCorrelationFound(String pauseTargetOption) throws Exception { assertCorrelationFound(pauseTargetOption, /*requireFrontierRotation=*/ false); } @@ -81,27 +90,17 @@ private void assertCorrelationFound(String pauseTargetOption) throws Exception { * Drives the leak-correlation child JVM and asserts the correlated chain, with the * referencechains pausetarget given by {@code pauseTargetOption} (everything else held * fixed across the two callers so the variant differs in exactly the pass-window regime). - * With {@code requireFrontierRotation} (the tight-window variant), the + * With {@code requireFrontierRotation} (the tight-window pod-regime variant), the * leak-accumulation rotation's FRONTIER-state selection is additionally asserted, and - * the correlation result markers that the tight window legitimately produces without the + * the correlation result markers that the pod regime legitimately produces without the * full correlation completing (not-found, tag-out-of-pool - see the tight variant's own - * comment) are accepted instead of failed. This variant runs only on DEBUG-instrumented - * native builds and forces reference-chains debug level 2 in the child; the loose variant - * runs on every build. + * comment) are accepted instead of failed. */ private void assertCorrelationFound(String pauseTargetOption, boolean requireFrontierRotation) throws Exception { assumeFalse(Platform.isJavaVersion(8)); assumeFalse(Platform.isJ9()); assumeFalse(Platform.isZing()); - if (requireFrontierRotation) { - // The FRONTIER-rotation signal is a level-2 TEST_LOG line (referenceChainWalk.cpp, - // collectLeakAccumulationCandidatesForRotation) - compiled out without -DDEBUG - // (debug/asan/tsan only) and silent unless DD_PROFILING_REFERENCE_CHAINS_DEBUG=2. - assumeTrue(ReferenceChainAssertions.isDebugInstrumentedBuild(), - "FRONTIER-rotation assertion needs the reference-chains TEST_LOG stream, only " - + "compiled into DEBUG-instrumented builds (debug/asan/tsan)"); - } Path scratchDumpPath = Files.createTempFile("referencechains-correlation-", ".jfr"); Files.deleteIfExists(scratchDumpPath); @@ -114,12 +113,17 @@ private void assertCorrelationFound(String pauseTargetOption, // Same raised budget as ExternalProcessReferenceChainTest's own scenarios: a genuinely // fresh, cold external JVM's reachable graph is far larger than the in-process tests', // and this scenario adds ~100k filler objects on top. The pausetarget varies by caller. - // memory=64:l:1.0 - the explicit liveness-sample ratio is load-bearing: the default - // (10%, arguments.h's _live_samples_ratio) makes LivenessTracker::track() drop 90% of - // tracked instances, and with only tens of 1MB leak chunks the (klass, tid) population - // becomes a per-run lottery (observed as intermittent "tagLeakInstances ZERO" runs). - // 1.0 makes LeakTagCorrelationScenario's "every allocation is sampled, tracked, and - // taggable" assumption true. + // memory=64:l:1.0 - the explicit liveness-sample ratio is load-bearing, + // not decoration: without a ratio segment, the default is 10% + // (arguments.h's _live_samples_ratio) and LivenessTracker::track() + // drops 90% of tracked instances probabilistically. This scenario's + // leak cohort is only tens of 1MB chunks, so the default makes the + // (klass, tid) population a per-run Bernoulli lottery - observed live + // as the intermittent "tagLeakInstances ZERO" runs where zero chunks + // survived the filter (passing runs' stable "tagged=5" is exactly the + // ~10% tail of ~50 chunks). 1.0 makes the scenario's documented + // assumption ("every allocation is sampled, tracked, and taggable", + // LeakTagCorrelationScenario) actually true. String startCommand = "start,memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=200000:ttl=120000:framecap=2000000:" + pauseTargetOption @@ -127,30 +131,22 @@ private void assertCorrelationFound(String pauseTargetOption, String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); List jvmArgs = Collections.singletonList( - "-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); + "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); AtomicReference resultLine = new AtomicReference<>(); - // Level 2 is required for the FRONTIER-selection TEST_LOG line (rcDebugLevel.h); the - // loose variant keeps the default (silent) level. - Map childEnv = requireFrontierRotation - ? Collections.singletonMap("DD_PROFILING_REFERENCE_CHAINS_DEBUG", "2") - : Collections.emptyMap(); LaunchResult result = launch("leak-correlation", jvmArgs, packedCommand, - childEnv, + Collections.emptyMap(), // The scenario's own round loop (up to 25 rounds plus a 5-attempt grace period, // ~40-60s observed) on top of a cold external JVM's startup/classloading cost and - // this scenario's larger graph - same margin logic as the existing scenarios. The - // stale-owner check after a debug-build correlation adds up to ~10s. - childTimeoutSeconds(150), + // this scenario's larger graph - same margin logic as the existing scenarios. + 150, line -> { if (line.startsWith(LeakTagCorrelationScenario.FOUND_MARKER) || line.equals(LeakTagCorrelationScenario.NOT_FOUND_MARKER) || line.startsWith(LeakTagCorrelationScenario.TAG_OUT_OF_POOL_MARKER) || line.startsWith(LeakTagCorrelationScenario.NO_LIVE_OBJECT_MARKER) || line.startsWith(LeakTagCorrelationScenario.TRANSIENT_CHAIN_MARKER) - || line.startsWith(LeakTagCorrelationScenario.NOISE_CHAIN_MARKER) - || line.startsWith(LeakTagCorrelationScenario.NOT_OWNER_VERIFIED_MARKER) - || line.startsWith(LeakTagCorrelationScenario.STALE_OWNER_CHAIN_MARKER)) { + || line.startsWith(LeakTagCorrelationScenario.NOISE_CHAIN_MARKER)) { resultLine.set(line); } if (line.startsWith("[TEST::INFO]")) { @@ -158,21 +154,16 @@ private void assertCorrelationFound(String pauseTargetOption, && line.contains("state=FRONTIER")) { frontierRotationSeen.set(true); } - // The reader thread can still be running after a join timeout, so every access - // to the tail is synchronized (diagnostics() reads a snapshot). - synchronized (testLogTail) { - testLogTail.addLast(line); - while (testLogTail.size() > 2000) { - testLogTail.removeFirst(); - } + testLogTail.addLast(line); + while (testLogTail.size() > 2000) { + testLogTail.removeFirst(); } } return LineConsumerResult.CONTINUE; }, null); - assertTrue(result.inTime, "Child process did not exit within the wait timeout" - + diagnostics(testLogTail)); + assertTrue(result.inTime, "Child process did not exit within the wait timeout"); assertEquals(0, result.exitCode, "Child process exited with a non-zero code"); assertNotNull(resultLine.get(), "Child process never printed a recognizable result marker" + " on stdout" + diagnostics(testLogTail)); @@ -180,8 +171,9 @@ private void assertCorrelationFound(String pauseTargetOption, if (requireFrontierRotation) { assertTrue(frontierRotationSeen.get(), "leak-accumulation rotation never selected a FRONTIER-state (un-expanded) " - + "holder under the tight window - a dead rotation tier (zero selections) " - + "looks exactly like this" + diagnostics(testLogTail)); + + "holder under the pod-like tight window - the round-4 regression this " + + "variant exists to catch (tier dead: zero selections) would look exactly " + + "like this" + diagnostics(testLogTail)); } if (line.startsWith(LeakTagCorrelationScenario.FOUND_MARKER)) { long targetTag = Long.parseLong( @@ -193,7 +185,7 @@ private void assertCorrelationFound(String pauseTargetOption, } if (requireFrontierRotation && (line.equals(LeakTagCorrelationScenario.NOT_FOUND_MARKER) || line.startsWith(LeakTagCorrelationScenario.TAG_OUT_OF_POOL_MARKER))) { - // The tight window legitimately produces these without full correlation completing + // The pod regime legitimately produces these without full correlation completing // (see the tight variant's comment); the loose variant still fails on them. return; } @@ -210,11 +202,7 @@ private void assertCorrelationFound(String pauseTargetOption, * gotw batch-size trace (batch control regressions), and any leak-tag interception or * correlation lines. Capped so the message stays readable. */ - private static String diagnostics(Deque testLogTailRef) { - List testLogTail; - synchronized (testLogTailRef) { - testLogTail = new ArrayList<>(testLogTailRef); - } + private static String diagnostics(Deque testLogTail) { if (testLogTail.isEmpty()) { return "\n(no TEST_LOG output captured - non-debug build or no reference-chain passes ran)"; } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java index 346728f387..f83eb16c15 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java @@ -6,26 +6,21 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.JavaProfiler; -import com.datadoghq.profiler.ReferenceChainTestHooks; import org.openjdk.jmc.common.IMCType; import org.openjdk.jmc.common.item.IItem; import org.openjdk.jmc.common.item.IItemCollection; import org.openjdk.jmc.common.item.IItemIterable; import org.openjdk.jmc.common.item.IMemberAccessor; import org.openjdk.jmc.common.item.IType; -import org.openjdk.jmc.common.item.ItemFilters; import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit; import java.io.InputStream; import java.nio.file.Files; import java.nio.file.Path; import java.util.ArrayList; -import java.util.HashMap; import java.util.List; -import java.util.Map; - -import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_BASE; -import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_POOL_SIZE; +import java.util.ArrayList; +import java.util.List; /** * The "leak-tag correlation" use case, run inside a genuinely separate child JVM by @@ -36,8 +31,9 @@ * matching a {@code datadog.HeapLiveObject} event's {@code leakTag} for the same object - * the chain-to-live-heap-sample correlation the whole leak-tag pool exists to provide. * - *

    Each ingredient reproduces, in miniature, a condition of large deployments that - * smaller local tests do not reach: + *

    Each ingredient exists to reproduce, in miniature, a condition that only showed + * against real large deployments before this scenario existed (all observed live on a + * production-like pod, each escaping every earlier local test): *

      *
    • Scale ({@link #FILLER}): ~100k live filler objects grow the JVMTI tag map * enough that {@code GetObjectsWithTags} has a real per-call cost floor, the BFS @@ -56,12 +52,7 @@ * chunk's chain must carry a {@code targetTag} in the leak-tag pool's range - * mirrored here from {@code LEAK_TAG_BASE}/{@code LEAK_TAG_POOL_SIZE} * (referenceChains.h) - and at least one {@code datadog.HeapLiveObject} event for a - * {@code byte[]} must carry the same value in {@code leakTag} (joined on - * {@code (tag, leakTagIncarnation)}, since leak tags are recycled). On -DDEBUG builds the - * chain must also be the one {@code getReferenceChainResolvedTargetTagForTest0} resolves for - * a live {@link #LEAK_SINK} chunk (instance identity, not just class), and after that owner - * chunk is dropped and its tag released, its chain must stop being emitted under that - * {@code (tag, leakTagIncarnation)}.
      • + * {@code byte[]} must carry the same value in {@code leakTag}. *
    * *

    Same separate-process rationale as {@code LeakingCacheScenario}'s own class comment @@ -80,7 +71,9 @@ private LeakTagCorrelationScenario() {} * discovering contents added after a resize is exactly the hard production case * this scenario must prove works: the live holder's re-walk has to admit each new * backing array, and only then can its new chunks be admitted and leak-tag - * intercepted. + * intercepted. (An earlier fixed-array version of this fixture sidestepped that + * requirement and still failed - see the scenario history in the investigation + * notes - which is what exposed the rotation starvation this fixture now encodes.) */ static final List LEAK_SINK = new ArrayList<>(); @@ -116,6 +109,13 @@ private static void addChunk() { LEAK_SINK.add(new byte[CHUNK_BYTES]); } + // Mirrored from referenceChains.h (LEAK_TAG_BASE/LEAK_TAG_POOL_SIZE): the pool range a + // correlated chain's targetTag must fall into, and the range a matching HeapLiveObject's + // leakTag must fall into. This is the contract under test, asserted against runtime + // event values - not constants compared to constants. + private static final long LEAK_TAG_BASE = 0x40000000L; + private static final long LEAK_TAG_POOL_SIZE = 256; + /** * Transient handoff channel for the noise representative - deliberately a local of * {@code run()} (captured by the noise thread's lambda), NOT a static field: any static @@ -185,35 +185,10 @@ NoisePayload take() { */ public static final String NOISE_CHAIN_MARKER = "[correlation-noise-chain-emitted] "; - /** - * Printed (with the tag) if no correlated in-pool byte[] chain was the chain the identity seam - * resolves for a live {@link #LEAK_SINK} chunk. -DDEBUG builds only. - */ - public static final String NOT_OWNER_VERIFIED_MARKER = "[correlation-not-owner-verified] "; - - /** - * Printed (with the tag) if, after the verified owner chunk was dropped, every dump still - * emitted a byte[] chain under the owner's {@code (tag, leakTagIncarnation)} - the dead - * owner's cached chain outliving its tag (ownership-stamp regression). -DDEBUG builds only. - */ - public static final String STALE_OWNER_CHAIN_MARKER = "[correlation-stale-owner-chain] "; - - /** Dumps the stale-owner check waits through for the dropped chunk's tag to be released. */ - private static final int STALE_CHECK_ATTEMPTS = 10; - - /** - * Scan outcome: payload fields from one dump; transientViolations/noiseChains accumulated - * across all scans by keepBest(). - */ + /** One dump's scan outcome - all fields per the latest dump only. */ private static final class ScanResult { ReferenceChainAssertions.ChainMatch payloadChain; boolean payloadChainInPool; - // In-pool and (on -DDEBUG builds) resolved by the identity seam for a live LEAK_SINK chunk. - boolean payloadChainOwnerVerified; - // LEAK_SINK index of that chunk at scan time; -1 when not verified or on release builds. - int payloadOwnerIndex = -1; - // ReferenceChain.leakTagIncarnation of payloadChain; -1 when the field is absent. - long payloadChainIncarnation = -1; int liveObjectMatchesForChainTag; final List transientViolations = new ArrayList<>(); final List noiseChains = new ArrayList<>(); @@ -243,7 +218,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } // The tid must be captured on THIS thread: the per-(klass, tid) seeding below // qualifies the allocating thread, and the noise instances are all allocated here. - handoff.publish(held[0], ReferenceChainTestHooks.getTid()); + handoff.publish(held[0], JavaProfiler.getTid()); long slot = 0; while (true) { try { @@ -253,10 +228,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } // Churn one slot at a time: the population stays live-but-ephemeral (constant live // count, nothing durably retained beyond the frame) while still allocating. - // held[0] is reserved: it is the published noise representative, and after - // handoff.take() this frame is its only strong reference (the tracker holds just a - // weak ref) - churning it would let the representative be collected. - held[1 + (int) (slot++ % (held.length - 1))] = new NoisePayload(); + held[(int) (slot++ % held.length)] = new NoisePayload(); } }, "leak-correlation-noise"); noiseThread.setDaemon(true); @@ -266,7 +238,9 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD profiler.execute(startCommand); } - boolean debugBuild = ReferenceChainAssertions.isDebugInstrumentedBuild(); + boolean debugBuild = "debug".equals(System.getProperty("ddprof_test.config")); + // Declared at method scope: the per-round and final-attempt maintenance + // seeding below (in their own debugBuild blocks) reuse these tids. int leakTid = 0; int noiseTid = 0; if (debugBuild) { @@ -281,19 +255,8 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // process's life; the noise representative only via the noise thread's frame (the // handoff's own reference is dropped by take()) - exactly what makes one a valid // leak candidate and the other a gate test. - // The noise thread publishes asynchronously: wait for it, or take() below could - // return null (no alias to the real NoisePayload klass) and handoff.tid could be 0 - // (no real allocating tid qualified) - noise suppression would then go unexercised. - // Plain volatile read, NOT take(): take() drops the handoff's reference. - long noisePublicationDeadline = System.nanoTime() + 30_000_000_000L; - while (handoff.representative == null && System.nanoTime() < noisePublicationDeadline) { - Thread.sleep(10); - } - if (handoff.representative == null || handoff.tid <= 0) { - throw new IllegalStateException("Noise thread did not publish a representative and tid"); - } - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(LEAK_KLASS_ID, LEAK_SINK.get(0)); - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(NOISE_KLASS_ID, handoff.take()); + JavaProfiler.setKlassPopulationRepresentativeForTest0(LEAK_KLASS_ID, LEAK_SINK.get(0)); + JavaProfiler.setKlassPopulationRepresentativeForTest0(NOISE_KLASS_ID, handoff.take()); // Per-(klass, tid) qualification seeds: selectLeakCandidates() now also // requires a qualifying ALLOCATING THREAD, and tagLeakInstances() scopes leak // tags to exactly those tids' instances - so the seeded qualification must @@ -302,40 +265,35 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // the tagging scope. Same epoch-aligned ramp shape as the klass seeds // (scaled to fit the per-tid u8 ring); the synthetic flag keeps these // ramps immune to the real fold's absent-tid decay between rounds. - leakTid = ReferenceChainTestHooks.getTid(); + leakTid = JavaProfiler.getTid(); noiseTid = handoff.tid; for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); - ReferenceChainTestHooks.seedKlassPopulationSample0(NOISE_KLASS_ID, epoch * 10, epoch); - ReferenceChainTestHooks.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, epoch * 3, epoch); - ReferenceChainTestHooks.seedTidTrendSample0(NOISE_KLASS_ID, noiseTid, epoch * 3, epoch); + JavaProfiler.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); + JavaProfiler.seedKlassPopulationSample0(NOISE_KLASS_ID, epoch * 10, epoch); + JavaProfiler.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, epoch * 3, epoch); + JavaProfiler.seedTidTrendSample0(NOISE_KLASS_ID, noiseTid, epoch * 3, epoch); } - // Maintenance continues the seeded ramp instead of restarting at 1. - hysteresisEpoch = SEED_EPOCHS_FOR_HYSTERESIS; // Wait for the BFS thread to fully complete its first pass (static sweep AND frontier // expansion) before any growth round - same load-bearing wait and rationale as // StaticFieldGrowingCollectionScenario: the late chunks added afterward must be // discovered via rotation re-walks, not by a first pass that has not even run yet. - int initialPasses = ReferenceChainTestHooks.referenceChainPassesRunForTest0(); + int initialPasses = JavaProfiler.referenceChainPassesRunForTest0(); for (int i = 0; i < 300; i++) { - if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() != initialPasses) { + if (JavaProfiler.referenceChainPassesRunForTest0() != initialPasses) { break; } Thread.sleep(100); } - ReferenceChainTestHooks.pollReferenceChainTargets0(); + JavaProfiler.pollReferenceChainTargets0(); } else { - // No test seams outside -DDEBUG builds (debug/asan/tsan) - give the real allocation sampler and the + // No debug seams outside debug builds - give the real allocation sampler and the // pass loop time to notice the seeded population on their own. Thread.sleep(5000); } // Each dump re-emits every resolved chain (drainPendingChainEvents()'s // snapshot-and-keep contract), so a later dump's scan is a superset state - the - // latest scan with a payload chain observed is always the best payload evidence. Gate - // violations are NOT taken from the latest scan alone: keepBest() accumulates them - // across every scan (a violating resolved chain may be invalidated/evicted before a - // later dump, and the gates are 'ever emitted' contracts). + // latest scan with a payload chain observed is always the best evidence. ScanResult best = null; int totalRounds = 25; // Slow growth per round is deliberate: each chunk clears the allocation @@ -346,13 +304,13 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD addChunk(); if (debugBuild) { hysteresisEpoch++; - ReferenceChainTestHooks.seedKlassPopulationSample0( + JavaProfiler.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - ReferenceChainTestHooks.seedKlassPopulationSample0( + JavaProfiler.seedKlassPopulationSample0( NOISE_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - ReferenceChainTestHooks.seedTidTrendSample0( + JavaProfiler.seedTidTrendSample0( LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); - ReferenceChainTestHooks.seedTidTrendSample0( + JavaProfiler.seedTidTrendSample0( NOISE_KLASS_ID, noiseTid, hysteresisEpoch * 3, hysteresisEpoch); } System.gc(); @@ -366,10 +324,9 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // win the tagging priority. Rounds are still dumped every time so // the final dump always holds the freshest chains. if (round % 3 == 0) { - // The identity seam is read after the dump: a chain in the dump for a live chunk stays - // cached (snapshot-and-keep), and chains built since only add keys the dump lacks. - best = keepBest(best, scan(scratchDumpPath, debugBuild ? liveOwnerTags() : null)); - if (correlated(best)) { + best = keepBest(best, scan(scratchDumpPath)); + if (best != null && best.payloadChainInPool + && best.liveObjectMatchesForChainTag > 0) { break; // full correlation achieved - no need to grow further } } @@ -377,215 +334,67 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } for (int attempt = 0; attempt < 5; attempt++) { - if (correlated(best)) { + if (best != null && best.payloadChainInPool && best.liveObjectMatchesForChainTag > 0) { break; } if (debugBuild) { hysteresisEpoch++; - ReferenceChainTestHooks.seedKlassPopulationSample0( + JavaProfiler.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - ReferenceChainTestHooks.seedKlassPopulationSample0( + JavaProfiler.seedKlassPopulationSample0( NOISE_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - ReferenceChainTestHooks.seedTidTrendSample0( + JavaProfiler.seedTidTrendSample0( LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); - ReferenceChainTestHooks.seedTidTrendSample0( + JavaProfiler.seedTidTrendSample0( NOISE_KLASS_ID, noiseTid, hysteresisEpoch * 3, hysteresisEpoch); } Thread.sleep(1000); System.gc(); profiler.dump(scratchDumpPath); - best = keepBest(best, scan(scratchDumpPath, debugBuild ? liveOwnerTags() : null)); + best = keepBest(best, scan(scratchDumpPath)); } - // Gate violations are 'ever emitted' contracts, independent of whether a payload chain - // was found - report them first so a NOT_FOUND result (accepted by the tight-window - // variant) can never mask a suppression regression. - if (best != null && !best.transientViolations.isEmpty()) { - System.out.println(TRANSIENT_CHAIN_MARKER + best.transientViolations); + if (best == null || best.payloadChain == null) { + System.out.println(NOT_FOUND_MARKER); return; } - if (best != null && !best.noiseChains.isEmpty()) { - System.out.println(NOISE_CHAIN_MARKER + best.noiseChains); + if (!best.transientViolations.isEmpty()) { + System.out.println(TRANSIENT_CHAIN_MARKER + best.transientViolations); return; } - // Marker order mirrors the evidence ranking in evidenceScore() below: - // out-of-pool (0) < unverified in-pool (1) < owner-verified in-pool (2) - - // report the weakest evidence first, and keep this cascade in lockstep with - // evidenceScore() if the ranking ever changes. - if (best == null || best.payloadChain == null) { - System.out.println(NOT_FOUND_MARKER); + if (!best.noiseChains.isEmpty()) { + System.out.println(NOISE_CHAIN_MARKER + best.noiseChains); return; } if (!best.payloadChainInPool) { System.out.println(TAG_OUT_OF_POOL_MARKER + best.payloadChain.targetTag); return; } - if (!best.payloadChainOwnerVerified) { - System.out.println(NOT_OWNER_VERIFIED_MARKER + best.payloadChain.targetTag); - return; - } if (best.liveObjectMatchesForChainTag == 0) { System.out.println(NO_LIVE_OBJECT_MARKER + best.payloadChain.targetTag); return; } - if (debugBuild) { - long ownedTag = best.payloadChain.targetTag; - long ownedIncarnation = best.payloadChainIncarnation; - // Drop the verified owner: its tracked entry dies, cleanup_table() releases the leak tag - // (stamp bump), and the next acquire may hand the same tag to another object. The dead - // owner's chain must never be emitted under its old (tag, stamp) again. The removed chunk - // is deliberately not kept in a local. - LEAK_SINK.remove(best.payloadOwnerIndex); - boolean clean = false; - for (int attempt = 0; attempt < STALE_CHECK_ATTEMPTS && !clean; attempt++) { - System.gc(); - Thread.sleep(500); - profiler.dump(scratchDumpPath); - clean = !hasByteArrayChain(scratchDumpPath, ownedTag, ownedIncarnation) - // Without the stamp field the tag alone cannot tell a new owner from the dead one. - || (ownedIncarnation < 0 && liveOwnerTags().containsKey(ownedTag)); - } - if (!clean) { - System.out.println(STALE_OWNER_CHAIN_MARKER + ownedTag); - return; - } - } System.out.println(FOUND_MARKER + best.payloadChain.targetTag); } - private static boolean correlated(ScanResult r) { - return r != null && r.payloadChainInPool && r.payloadChainOwnerVerified - && r.liveObjectMatchesForChainTag > 0; - } - - /** - * Leak tag -> LEAK_SINK index of the chunk whose own cached chain carries it, via the identity - * seam (0 means no chain resolved for that chunk). Stores indices, never chunk references, so - * an owner can still die. - */ - private static Map liveOwnerTags() { - Map owners = new HashMap<>(); - for (int i = 0; i < LEAK_SINK.size(); i++) { - long tag = - ReferenceChainTestHooks.getReferenceChainResolvedTargetTagForTest0(LEAK_SINK.get(i)); - if (tag != 0) { - owners.put(tag, i); - } - } - return owners; - } - - /** - * Whether the dump holds a byte[] chain with this targetTag and leakTagIncarnation (-1 matches - * a chain without the field). - */ - private static boolean hasByteArrayChain(Path scratchDumpPath, long tag, long incarnation) - throws Exception { - if (!Files.exists(scratchDumpPath)) { - return false; - } - IItemCollection events; - try (InputStream in = Files.newInputStream(scratchDumpPath)) { - events = JfrLoaderToolkit.loadEvents(in); - } - IItemCollection chains = events.apply( - ItemFilters.type("datadog.ReferenceChain")); - for (IItemIterable iterable : chains) { - IType type = iterable.getType(); - IMemberAccessor chainAccessor = ReferenceChainAssertions.findAccessor(type, "chain"); - IMemberAccessor targetTagAccessor = - ReferenceChainAssertions.findAccessor(type, "targetTag"); - IMemberAccessor incarnationAccessor = - ReferenceChainAssertions.findAccessor(type, "leakTagIncarnation"); - if (chainAccessor == null || targetTagAccessor == null) { - continue; - } - for (IItem item : iterable) { - Object chainValue = chainAccessor.getMember(item); - if (!(chainValue instanceof Object[])) { - continue; - } - Object[] rawChain = (Object[]) chainValue; - if (rawChain.length == 0 || !(rawChain[0] instanceof IMCType) - || !"byte[]".equals(((IMCType) rawChain[0]).getFullName())) { - continue; - } - long chainIncarnation = incarnationAccessor != null - ? ReferenceChainAssertions.numberValue(incarnationAccessor.getMember(item)) : -1; - if (ReferenceChainAssertions.numberValue(targetTagAccessor.getMember(item)) == tag - && chainIncarnation == incarnation) { - return true; - } - } - } - return false; - } - - /** - * Payload state comes from the latest scan that saw a payload chain (a scan without one - * never displaces one that had it). Gate violations (transient/noise chains) are - * accumulated across ALL scans - they are 'ever emitted' contracts, and a violating - * resolved chain may be invalidated/evicted before a later dump. - */ + /** Latest scan wins; a scan without a payload chain never displaces one that had it. */ private static ScanResult keepBest(ScanResult best, ScanResult scan) { if (scan == null) { return best; } - if (best == null) { + if (scan.payloadChain != null) { return scan; } - // Same evidence ranking scan() applies within one dump: an owner-verified - // in-pool chain (2) outranks an unverified in-pool one (1), which outranks - // any out-of-pool chain (0). A later scan only wins on equal or better - // evidence, so noise churn and tag recycling cannot displace the - // best-evidenced correlation mid-run. - int bestScore = evidenceScore(best); - int scanScore = evidenceScore(scan); - ScanResult result = scanScore > bestScore || (scanScore == bestScore - && scan.payloadChain != null) ? scan : best; - ScanResult other = result == scan ? best : scan; - // Both non-null here: the early returns above already handled a null scan - // (kept best) and a null best (kept scan), so the loser always exists. - mergeDistinct(result.transientViolations, other.transientViolations); - mergeDistinct(result.noiseChains, other.noiseChains); - return result; - } - - private static int evidenceScore(ScanResult scan) { - if (scan.payloadChain == null) { - return -1; - } - return evidenceRank(scan.payloadChainInPool, scan.payloadChainOwnerVerified); - } - - // The single definition of the scan-evidence ranking: owner-verified in-pool (2) - // > unverified in-pool (1) > out-of-pool (0). scan()'s within-dump candidate - // selection and keepBest()'s cross-dump merge both derive from this, so a - // ranking change cannot leave one site disagreeing with the others. - private static int evidenceRank(boolean inPool, boolean ownerVerified) { - return inPool ? (ownerVerified ? 2 : 1) : 0; - } - - private static void mergeDistinct(List into, List from) { - for (String s : from) { - if (!into.contains(s)) { - into.add(s); - } - } + return best != null ? best : scan; } /** - * Scans one dump: the best leaked {@code byte[]} chain (if any), whether its targetTag is - * in the leak-tag pool and owned by a live LEAK_SINK chunk, how many - * {@code datadog.HeapLiveObject} events for a leaked {@code byte[]} carry that same - * {@code (leakTag, leakTagIncarnation)}, plus the two gate regressions (transient-rooted - * depth<=1 chains, any {@link NoisePayload} chain). - * - * @param liveOwners {@link #liveOwnerTags()} read after this dump, or null on release builds - * (no identity seam: any in-pool chain counts as owner-verified) + * Scans one dump: the first leaked {@code byte[]} chain (if any), whether its targetTag is + * in the leak-tag pool, how many {@code datadog.HeapLiveObject} events for a + * leaked {@code byte[]} carry that same tag in {@code leakTag}, plus the two gate + * regressions (transient-rooted depth<=1 chains, any {@link NoisePayload} chain). */ - private static ScanResult scan(Path scratchDumpPath, Map liveOwners) - throws Exception { + private static ScanResult scan(Path scratchDumpPath) throws Exception { if (!Files.exists(scratchDumpPath)) { return null; } @@ -596,7 +405,7 @@ private static ScanResult scan(Path scratchDumpPath, Map liveOwne ScanResult result = new ScanResult(); IItemCollection chains = events.apply( - ItemFilters.type("datadog.ReferenceChain")); + org.openjdk.jmc.common.item.ItemFilters.type("datadog.ReferenceChain")); for (IItemIterable iterable : chains) { IType type = iterable.getType(); IMemberAccessor chainAccessor = ReferenceChainAssertions.findAccessor(type, "chain"); @@ -605,8 +414,6 @@ private static ScanResult scan(Path scratchDumpPath, Map liveOwne IMemberAccessor depthAccessor = ReferenceChainAssertions.findAccessor(type, "depth"); IMemberAccessor rootKindAccessor = ReferenceChainAssertions.findAccessor(type, "rootKind"); - IMemberAccessor incarnationAccessor = - ReferenceChainAssertions.findAccessor(type, "leakTagIncarnation"); for (IItem item : iterable) { Object chainValue = chainAccessor.getMember(item); if (!(chainValue instanceof Object[])) { @@ -634,14 +441,9 @@ private static ScanResult scan(Path scratchDumpPath, Map liveOwne // instance of the candidate class gets one, and only the tracked-and- // tagged instances carry a pool-range targetTag - the rest legitimately // carry their frontier tag (the correlation is additive on top of the - // chain, not a property of every chain). Prefer the first owner-verified - // in-pool chain, then any in-pool one, over an out-of-pool one seen earlier. - boolean ownerVerified = - inPool && (liveOwners == null || liveOwners.containsKey(targetTag)); - int score = evidenceRank(inPool, ownerVerified); - int currentScore = result.payloadChain == null ? -1 - : evidenceRank(result.payloadChainInPool, result.payloadChainOwnerVerified); - if (score > currentScore) { + // chain, not a property of every chain). Prefer the first in-pool + // (correlated) chain over any out-of-pool one seen earlier. + if ((inPool && !result.payloadChainInPool) || result.payloadChain == null) { List chain = new ArrayList<>(rawChain.length); for (Object element : rawChain) { chain.add((IMCType) element); @@ -649,11 +451,6 @@ private static ScanResult scan(Path scratchDumpPath, Map liveOwne result.payloadChain = new ReferenceChainAssertions.ChainMatch( chain, targetTag, depth); result.payloadChainInPool = inPool; - result.payloadChainOwnerVerified = ownerVerified; - result.payloadOwnerIndex = - ownerVerified && liveOwners != null ? liveOwners.get(targetTag) : -1; - result.payloadChainIncarnation = incarnationAccessor != null - ? ReferenceChainAssertions.numberValue(incarnationAccessor.getMember(item)) : -1; } } } @@ -661,36 +458,17 @@ private static ScanResult scan(Path scratchDumpPath, Map liveOwne if (result.payloadChainInPool) { IItemCollection liveObjects = events.apply( - ItemFilters.type("datadog.HeapLiveObject")); + org.openjdk.jmc.common.item.ItemFilters.type("datadog.HeapLiveObject")); for (IItemIterable iterable : liveObjects) { IType type = iterable.getType(); IMemberAccessor leakTagAccessor = ReferenceChainAssertions.findAccessor(type, "leakTag"); IMemberAccessor objectClassAccessor = ReferenceChainAssertions.findAccessor(type, "objectClass"); - IMemberAccessor incarnationAccessor = - ReferenceChainAssertions.findAccessor(type, "leakTagIncarnation"); - // Fail loud if either identity field is missing, mirroring - // ThreadLocalLeakScenario's guard: without the tag every live object - // reads -1 and never matches, without the incarnation the match - // degrades to tag-only - both must surface as errors, not as an empty - // correlation with no diagnostic. - if (leakTagAccessor == null) { - throw new IllegalStateException( - "datadog.HeapLiveObject events have no leakTag accessor"); - } - if (incarnationAccessor == null) { - throw new IllegalStateException( - "datadog.HeapLiveObject events have no leakTagIncarnation accessor"); - } for (IItem item : iterable) { - long leakTag = - ReferenceChainAssertions.numberValue(leakTagAccessor.getMember(item)); - long incarnation = - ReferenceChainAssertions.numberValue(incarnationAccessor.getMember(item)); - // Leak tags are recycled: the tag alone is ambiguous across chunks. - if (leakTag != result.payloadChain.targetTag - || incarnation != result.payloadChainIncarnation) { + long leakTag = leakTagAccessor != null + ? ReferenceChainAssertions.numberValue(leakTagAccessor.getMember(item)) : -1; + if (leakTag != result.payloadChain.targetTag) { continue; } Object objectClass = objectClassAccessor != null diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java index f23d5f2312..ed47fe10f3 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java @@ -6,13 +6,8 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.JavaProfiler; -import com.datadoghq.profiler.ReferenceChainTestHooks; import org.openjdk.jmc.common.IMCType; -import org.openjdk.jmc.common.item.IItem; import org.openjdk.jmc.common.item.IItemCollection; -import org.openjdk.jmc.common.item.IItemIterable; -import org.openjdk.jmc.common.item.IMemberAccessor; -import org.openjdk.jmc.common.item.IType; import org.openjdk.jmc.common.item.ItemFilters; import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit; @@ -23,42 +18,66 @@ import java.util.Map; /** - * The "leaking Java app" body run inside a separate child JVM by {@code ExternalLauncher}'s - * {@code leak-cache} mode, driven by {@code ExternalProcessReferenceChainTest}. Deliberately not a - * JUnit test: it must run alone in its own process so the process-wide {@code ReferenceChainTracker} - * singleton's one-shot root-seeded BFS walk belongs to this scenario only (see - * {@code ExternalProcessReferenceChainTest}'s class comment). The leak shape is an ever-growing, - * never-evicted {@code HashMap}-backed cache. + * The actual "leaking Java app" body run inside a genuinely separate child JVM by + * {@code ExternalLauncher}'s {@code leak-cache} mode, driven by + * {@code ExternalProcessReferenceChainTest}. Deliberately not a JUnit test itself - no + * {@code AbstractProfilerTest}/dynamic-attach lifecycle, no shared-JVM {@code ReferenceChainTracker} + * singleton with any other test - this class's whole point is to run alone in its own process, so + * the one-shot root-seeded BFS walk (see this class's own comment on why a previous attempt at + * folding this scenario into {@code ReferenceChainTrackingTest} as a second {@code @Test} method + * failed) always belongs to this scenario and only this scenario. * - *

    Why {@code cache} is populated before the profiler is started: - * {@code threadLoop()} (referenceChains.cpp) sleeps {@code _effective_cadence_ns} - 1 second, - * initially - before its first {@code shouldRunPass()} check, which always returns {@code true} - * on that first check ({@code !_search_started}). So the one-and-only root-seeded walk fires - * roughly one second after {@code startThread()}, or earlier if woken by a GC-finish signal. On a - * cold JVM, allocating only after starting the profiler lost that race essentially every time: - * the walk caught {@code cache} still empty, permanently blocking discovery of everything added - * afterward (a frontier entry once marked {@code EXPANDED} is never revisited for new children - - * see {@code expandFrontier()}). Seeding before {@code profiler.execute()} removes the race. + *

    Same realistic-leak shape as {@code ReferenceChainTrackingTest}'s own (now-removed) in-process + * attempt: an ever-growing, never-evicted {@code HashMap}-backed cache, held by a local variable. + * + *

    Why {@code cache} is seeded and populated before the profiler is even started + * (found the hard way, against a real separate-process run): {@code threadLoop()} + * (referenceChains.cpp) calls {@code OS::sleep(_effective_cadence_ns)} - 1 second, initially - + * *before* its very first {@code shouldRunPass()} check, and {@code shouldRunPass()} always + * returns {@code true} on that first-ever check ({@code !_search_started}). So the process's + * one-and-only root-seeded walk fires roughly one second after {@code startThread()}, or earlier + * if woken by a GC-finish signal - a race {@code ReferenceChainTrackingTest}'s own + * {@code shouldReportAbandonedSearchOnTinyFrontierCap()} comment already documents ("that wakeup + * can race the thread's own startup ... and be missed"). An initial in-process attempt at this + * exact scenario created {@code cache} and started allocating only *after* starting the profiler + * (mirroring {@code ReferenceChainTrackingTest}'s {@code gcRootHolder}, which happened to work by + * luck of scheduling in a warm, already-running JVM) - against a genuinely fresh, cold JVM this + * lost the race essentially every time: the one-shot walk caught {@code cache} still empty, + * permanently blocking discovery of everything added to it afterward (a frontier entry once + * marked {@code EXPANDED} is never revisited for new children - see {@code expandFrontier()}'s + * own comment). Seeding {@code cache} with real data *before* {@code profiler.execute()} is even + * called removes the race entirely: no matter how fast the walk fires, {@code cache} is never + * empty when it does. */ public final class LeakingCacheScenario { private LeakingCacheScenario() {} - // Arbitrary klass id - LivenessTracker treats it as an opaque key (see KlassPopulationEntry) - // and this process runs no other reference-chains scenario, so it cannot collide. + // Arbitrary, scenario-chosen klass id - this process's own LivenessTracker population table + // treats it as an opaque key (see KlassPopulationEntry's own comment) and this process never + // runs any other reference-chains scenario, so no collision risk with e.g. + // ReferenceChainTrackingTest's/ReferenceChainTestSeamsTest's own klass ids in their own, + // separate JVMs. private static final int CACHED_PAYLOAD_TEST_KLASS_ID = 987301; - // LivenessTracker's hysteresis gate (livenessTracker.h's KLASS_POPULATION_MIN_FILL_FOR_TREND=10 / - // LEAK_TREND_HYSTERESIS_BASE=5) only starts incrementing consecutive_positive once ring_fill - // reaches 10, so exactly 10 seedKlassPopulationSample0() calls cap consecutive_positive at 1 - - // short of what selectLeakCandidates() requires before hasLeakSignal() reports a candidate, which - // generations=true needs to authorize the BFS thread's first real pass. + // See ReferenceChainTrackingTest.SEED_EPOCHS_FOR_HYSTERESIS's own comment for the full + // derivation: LivenessTracker's hysteresis gate (livenessTracker.h's + // KLASS_POPULATION_MIN_FILL_FOR_TREND=10 / LEAK_TREND_HYSTERESIS_BASE=5) only starts + // incrementing consecutive_positive once ring_fill has reached 10, so a batch of exactly 10 + // seedKlassPopulationSample0() calls caps consecutive_positive at 1 - far short of what + // selectLeakCandidates() (livenessTracker.cpp) requires before ReferenceChainTracker:: + // hasLeakSignal() reports a candidate, which is what this scenario's own generations=true + // startCommand needs to authorize the BFS thread's first real pass at all. private static final int SEED_EPOCHS_FOR_HYSTERESIS = 15; /** * Durable holder for the cache fixture. The discovered-chain gate suppresses * chains shallower than the first real holder hop that are rooted at a TRANSIENT - * root (stack/JNI local) - a frame-held "leak" is not a leak - so the cache must - * be retained through a static field rather than only {@code run()}'s local. + * root (stack/JNI local) - a frame-held "leak" is by definition not a leak, so the + * cache must be retained through a static field (the real singleton-collection + * shape) rather than only {@code run()}'s own local, which is exactly the + * transient-rooted shape the gate suppresses. {@code run()}'s local {@code cache} + * variable below aliases this static; the durable root is what makes the emitted + * chain durable-rooted. */ private static final Map CACHE = new HashMap<>(); @@ -69,25 +88,35 @@ private LeakingCacheScenario() {} public static final String NOT_FOUND_MARKER = "[chain-not-found]"; /** - * Printed to stdout (with the offending chain appended) if a match was found but its - * chain did not pass through {@code java.util.HashMap}'s internal storage. + * Printed to stdout (with the offending class name appended) if a match was found but its + * chain did not pass through {@code java.util.HashMap}'s own internal storage - see + * {@code ExternalProcessReferenceChainTest} for why this is asserted in the parent process + * rather than here (keeping this scenario's own stdout contract to "found/not-found" and + * leaving richer chain-shape assertions to the JUnit side, the same separation of concerns + * {@code ReferenceChainJfrParserTest} already uses for the lower-level JFR-format proof). */ public static final String NO_HASHMAP_INTERNALS_MARKER = "[chain-found-no-hashmap-internals] "; /** * Printed to stdout (with an "N/M" re-emitted-dump count appended) if the chain was - * reconstructed but did not re-emit into one or more subsequent JFR dumps - i.e. the - * "snapshot-and-keep" contract of {@code ReferenceChainTracker::drainPendingChainEvents()} - * (referenceChains.cpp) failed to hold across dumps. + * successfully reconstructed but did not re-emit into one or more subsequent, + * independently written JFR dumps - i.e. the "snapshot-and-keep" contract of + * {@code ReferenceChainTracker::drainPendingChainEvents()} (referenceChains.cpp), which + * {@code Profiler::dump()} invokes on every dump without clearing the resolved-chain cache, + * failed to hold across dumps. Asserted by {@code ExternalProcessReferenceChainTest}. */ public static final String CHAIN_NOT_PERSISTED_MARKER = "[chain-not-persisted] "; /** - * Seeds {@code cache}, *then* starts the profiler (see the class comment for why that order is - * load-bearing), then grows the cache, dumping to {@code scratchDumpPath} after every round - * until a {@code datadog.ReferenceChain} event whose {@code chain[0]} is {@link CachedPayload} - * appears, and prints exactly one result line to stdout. The profiler is started here rather - * than in {@code ExternalLauncher} so {@code cache} can be seeded first. + * Seeds {@code cache} with an initial batch, *then* starts the profiler (see this class's own + * comment for why that order is load-bearing), then runs the same population-growth loop + * {@code ReferenceChainTrackingTest} pioneered - dumping to {@code scratchDumpPath} after every + * round (and a short grace period beyond the last round) until a {@code datadog.ReferenceChain} + * event whose {@code chain[0]} is {@link CachedPayload} appears - then prints exactly one + * result line to stdout. Called from {@code ExternalLauncher} (a different package - hence + * {@code public}), which owns the generic child-process bootstrap (JVMTI/library init, process + * exit) this scenario deliberately stays agnostic of; starting the profiler itself happens + * here, not in {@code ExternalLauncher}, specifically so {@code cache} can be seeded first. */ public static void run(JavaProfiler profiler, String startCommand, Path scratchDumpPath) throws Exception { Map cache = CACHE; @@ -99,7 +128,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } System.out.println("[debug] profiler.execute() returned"); - boolean debugBuild = ReferenceChainAssertions.isDebugInstrumentedBuild(); + boolean debugBuild = "debug".equals(System.getProperty("ddprof_test.config")); boolean seededTestKlassTrend = false; ReferenceChainAssertions.ChainMatch match = null; int totalRounds = 25; @@ -119,26 +148,36 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD match = findMatch(scratchDumpPath); if (match == null && debugBuild) { - // Debug-only seeded short-circuit: decouples the assertion from whether probabilistic - // allocation sampling notices CachedPayload's trend within the fixed round budget, by - // clearing hasLeakSignal()'s hysteresis gate outright. "seed-0" stays reachable via - // cache for the whole run, so it is a valid representative on any round. - // Representative BEFORE seeding: setKlassPopulationRepresentativeForTest0 aliases the - // synthetic id to the representative's real klass id, so the seeds below land in the - // real population entry (candidate matching is keyed by real id). - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(CACHED_PAYLOAD_TEST_KLASS_ID, cache.get("seed-0")); + // Same debug-only, seeded-representative short-circuit as ReferenceChainTrackingTest's + // own shouldReconstructReferrerChainThroughUnboundedCacheLeak() (see that method's own + // comment, and SEED_EPOCHS_FOR_HYSTERESIS's own comment above): decouples this scenario's + // assertion from whether the real, probabilistic allocation-sampling-driven slope + // detection happens to notice CachedPayload's own population trend within this scenario's + // fixed round/timeout budget - by clearing hasLeakSignal()'s own hysteresis gate outright, + // which is what actually authorizes the BFS thread's first real pass, rather than assuming + // some earlier pass has already tagged anything. "seed-0" (from seedInitialBatch()) is + // reachable via cache for the scenario's entire lifetime, so it is a safe, always-valid + // representative regardless of which round this fires on. + // Representative BEFORE seeding: setKlassPopulationRepresentativeForTest0 + // resolves the representative's real klass id and aliases the synthetic id + // to it, so the hysteresis seeds below land in the real population entry + // (candidate matching is real-id keyed since the leak-tag pool redesign). + JavaProfiler.setKlassPopulationRepresentativeForTest0(CACHED_PAYLOAD_TEST_KLASS_ID, cache.get("seed-0")); if (!seededTestKlassTrend) { - // The qualifying tid is THIS thread's - the creator of "seed-0". The per-round - // allocator threads are one-shot, so none of their tids carries a sustained - // per-tid signal. - int leakTid = ReferenceChainTestHooks.getTid(); + // Per-(klass, tid) qualification seeds: the qualifying tid is THIS + // thread's - the creator of "seed-0", the always-reachable representative + // the seeded ramp and the match below hang off. (The per-round allocator + // threads are one-shot, so no single one of their tids carries a sustained + // per-tid signal - exactly the one-cohort-per-thread shape the retained- + // count bar / synthetic seeds exist to keep qualifying.) + int leakTid = JavaProfiler.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0(CACHED_PAYLOAD_TEST_KLASS_ID, epoch * 10, epoch); - ReferenceChainTestHooks.seedTidTrendSample0(CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch * 3, epoch); + JavaProfiler.seedKlassPopulationSample0(CACHED_PAYLOAD_TEST_KLASS_ID, epoch * 10, epoch); + JavaProfiler.seedTidTrendSample0(CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch * 3, epoch); } seededTestKlassTrend = true; } - ReferenceChainTestHooks.pollReferenceChainTargets0(); + JavaProfiler.pollReferenceChainTargets0(); profiler.dump(scratchDumpPath); match = findMatch(scratchDumpPath); } @@ -178,10 +217,14 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD return; } - // Across-dumps persistence: Profiler::dump() re-snapshots the resolved-chain cache without - // clearing it (drainPendingChainEvents(), "snapshot-and-keep, not a drain"), so a still-live - // sample's chain must re-emit into every dump. `cache` keeps the sample live; each dump - // targets a brand-new file, so a match there can only come from re-emission. + // Across-dumps persistence: a resolved chain must re-emit into EVERY subsequent dump the + // sample survives into, not only the one dump that first observed it. Profiler::dump() + // re-snapshots the whole resolved-chain cache without clearing it on every call + // (drainPendingChainEvents(), referenceChains.cpp - "snapshot-and-keep, not a drain"), so a + // still-live sample's chain re-emits into every chunk. `cache` still holds every + // CachedPayload here, so the sample stays live across these extra dumps; each dump targets a + // brand-new file, so a chain found there can only be present because it was re-emitted into + // that dump, not left over from the round-loop's own scratchDumpPath. int persistChecks = 3; int persisted = 0; for (int i = 1; i <= persistChecks; i++) { @@ -207,7 +250,13 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD System.out.println(FOUND_MARKER + match.chain.get(0).getFullName()); } - /** Key namespace "seed-" is disjoint from the round loop's "leak-". */ + /** + * Populates {@code cache} with {@code count} entries under a key namespace ("seed-") disjoint + * from the round loop's own ("leak-") - called before the profiler (and therefore + * {@code ReferenceChainTracker}'s BFS thread) even starts, so the process's one-shot + * root-seeded walk can never catch {@code cache} empty (see this class's own comment on why + * that race is otherwise real). + */ private static void seedInitialBatch(Map cache, int count) { for (int i = 0; i < count; i++) { String key = "seed-" + i; @@ -215,6 +264,7 @@ private static void seedInitialBatch(Map cache, int count } } + /** Temporary diagnostic: print all native debug counters. */ private static void debugDumpCounters(JavaProfiler profiler) { try { Map counters = profiler.getDebugCounters(); @@ -228,6 +278,7 @@ private static void debugDumpCounters(JavaProfiler profiler) { } } + /** Temporary diagnostic: print every datadog.ReferenceChain event's chain[0] class, if any. */ private static void debugDumpAllChainLeaves(Path scratchDumpPath) { try { if (!Files.exists(scratchDumpPath)) { @@ -247,15 +298,15 @@ private static void debugDumpAllChainLeaves(Path scratchDumpPath) { IItemCollection abandoned = events.apply(ItemFilters.type("datadog.ReferenceChainAbandoned")); long totalAbandoned = abandoned.stream().mapToLong(it -> it.getItemCount()).sum(); System.out.println("[debug] datadog.ReferenceChainAbandoned total events: " + totalAbandoned); - for (IItemIterable iterable : chains) { - IType type = iterable.getType(); - IMemberAccessor chainAccessor = + for (org.openjdk.jmc.common.item.IItemIterable iterable : chains) { + org.openjdk.jmc.common.item.IType type = iterable.getType(); + org.openjdk.jmc.common.item.IMemberAccessor chainAccessor = ReferenceChainAssertions.findAccessor(type, "chain"); if (chainAccessor == null) { System.out.println("[debug] no chain accessor found"); continue; } - for (IItem item : iterable) { + for (org.openjdk.jmc.common.item.IItem item : iterable) { Object chainValue = chainAccessor.getMember(item); if (chainValue instanceof Object[]) { Object[] raw = (Object[]) chainValue; @@ -283,10 +334,12 @@ private static ReferenceChainAssertions.ChainMatch findMatch(Path scratchDumpPat } /** - * Leak fixture. The 32 {@code long} fields exist so far fewer entries reach - * {@code ObjectSampler}'s 256KiB sampling floor - plain fields, not a nested array, because a - * companion array would be a second allocation competing for the size-weighted sampler's - * attention. + * Realistic-leak fixture - identical shape to {@code ReferenceChainTrackingTest}'s own + * (now-removed) in-process attempt. The 32 {@code long} fields exist purely so a given number + * of megabytes needs far fewer entries to reach {@code ObjectSampler}'s real 256KiB sampling + * floor - deliberately plain fields, not a nested array (a same-instance companion array would + * be a *second*, separate heap allocation the size-weighted allocation sampler would compete + * for, taking sampling attention away from {@code CachedPayload} itself). */ static final class CachedPayload { final String key; diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java index 735720170f..447a35cfbf 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java @@ -21,52 +21,22 @@ import java.util.Map; /** - * Shared {@code datadog.ReferenceChain} JFR-parsing helpers. + * Shared {@code datadog.ReferenceChain} JFR-parsing helpers, extracted out of + * {@code ReferenceChainTrackingTest} so both that in-process JUnit test and + * {@link LeakingCacheScenario} (run inside a genuinely separate child JVM by + * {@code ExternalProcessReferenceChainTest}) can reuse the exact same JMC-accessor logic + * rather than maintaining two copies. * - *

    Two overloads because callers load recordings differently: - * {@code ReferenceChainTrackingTest} uses {@code AbstractProfilerTest}'s {@code JfrEvents} - * helpers ({@link #findMatchForClass(JfrEvents, Class)}), while {@link LeakingCacheScenario} loads - * via JMC's {@code JfrLoaderToolkit} ({@link #findMatchForClass(IItemCollection, Class)}). + *

    {@link #findMatchForClass(JfrEvents, Class)} is a separate, jafar-backed counterpart to + * {@link #findMatchForClass(IItemCollection, Class)} for {@code ReferenceChainTrackingTest}, which + * loads recordings via {@code AbstractProfilerTest}'s {@code JfrEvents}-returning helpers. + * {@link LeakingCacheScenario} and {@code ReferenceChainJfrParserTest} + * load recordings directly via JMC's {@code JfrLoaderToolkit} and keep using the + * {@code IItemCollection} overload unchanged. */ public final class ReferenceChainAssertions { private ReferenceChainAssertions() {} - /** - * Leak-tag pool range, mirrored from referenceChains.h / livenessTracker.h (LEAK_TAG_BASE, - * LEAK_TAG_POOL_SIZE): a correlated chain's targetTag and its HeapLiveObject's leakTag must fall - * into [LEAK_TAG_BASE, LEAK_TAG_BASE + LEAK_TAG_POOL_SIZE). Asserted against runtime event - * values. - */ - public static final long LEAK_TAG_BASE = 0x40000000L; - - public static final long LEAK_TAG_POOL_SIZE = 256; - - /** - * True on every native build that compiles javaApi.cpp's {@code #ifdef DEBUG} test seams: debug, - * asan and tsan (all add -DDEBUG, ConfigurationPresets.kt). Release builds get no-op seam stubs. - * Child JVMs see the same answer because the launchers forward {@code -Dddprof_test.config}. - */ - public static boolean isDebugInstrumentedBuild() { - String config = System.getProperty("ddprof_test.config"); - return config != null && ("debug".equals(config) || config.endsWith("san")); - } - - /** - * The {@code ddprof_test.config} value ProfilerTestPlugin.kt sets on every test<config> task. - * Launchers forwarding it to a child JVM must fail loud when it is unset (a test run directly - * from an IDE, outside the Gradle tasks) instead of concatenating the literal "null", which the - * child would silently classify as a release build and take the unseeded, flakier path. - */ - public static String requiredTestConfig() { - String config = System.getProperty("ddprof_test.config"); - if (config == null) { - throw new IllegalStateException( - "ddprof_test.config is not set; run via a test Gradle task so the child " - + "JVM sees the right build configuration"); - } - return config; - } - /** Result of {@link #findMatchForClass(IItemCollection, Class)}: one resolved chain event's fields. */ public static final class ChainMatch { public final List chain; @@ -100,21 +70,6 @@ public static final class JfrChainMatch { * own comment). Returns {@code null} if {@code events} is empty or none match. */ public static ChainMatch findMatchForClass(IItemCollection events, Class targetClass) { - return findMatch(events, targetClass, false, 0); - } - - /** - * Same as {@link #findMatchForClass(IItemCollection, Class)}, but identifies one specific - * instance: only an item whose {@code targetTag} equals {@code requiredTargetTag} matches (an - * item without a readable {@code targetTag} never does). - */ - public static ChainMatch findMatchForClassAndTargetTag(IItemCollection events, - Class targetClass, long requiredTargetTag) { - return findMatch(events, targetClass, true, requiredTargetTag); - } - - private static ChainMatch findMatch(IItemCollection events, Class targetClass, - boolean requireTag, long requiredTargetTag) { if (events == null || !events.hasItems()) { return null; } @@ -139,14 +94,11 @@ private static ChainMatch findMatch(IItemCollection events, Class targetClass || !targetName.equals(((IMCType) rawChain[0]).getFullName())) { continue; } - long targetTag = targetTagAccessor != null ? numberValue(targetTagAccessor.getMember(item)) : -1; - if (requireTag && targetTag != requiredTargetTag) { - continue; - } List chain = new ArrayList<>(rawChain.length); for (Object element : rawChain) { chain.add((IMCType) element); } + long targetTag = targetTagAccessor != null ? numberValue(targetTagAccessor.getMember(item)) : -1; int depth = depthAccessor != null ? (int) numberValue(depthAccessor.getMember(item)) : -1; return new ChainMatch(chain, targetTag, depth); } @@ -185,9 +137,15 @@ public static JfrChainMatch findMatchForClass(JfrEvents events, Class targetC } /** - * {@code targetClass}'s name in {@code IMCType.getFullName()} format: {@code Class.getName()} - * renders {@code byte[].class} as {@code "[B"}, but JMC renders it as {@code "byte[]"}, so a - * direct comparison never matches an array-typed leaf. Non-array names are unchanged. + * {@code targetClass}'s name in the same format {@code IMCType.getFullName()} uses for array + * types - found the hard way: {@code Class.getName()} renders {@code byte[].class} as {@code + * "[B"} (JVM internal signature notation), but JMC's chunk parser renders the same array class's + * {@code IMCType.getFullName()} as {@code "byte[]"} (Java source notation), so comparing {@link + * Class#getName()} directly against {@code getFullName()} - as both {@code findMatchForClass} + * overloads above used to - can never match an array-typed leaf class, even when the correct + * event is genuinely present in the recording. Only affects array {@code targetClass} values + * (e.g. {@code byte[].class}); a non-array class's {@code getName()} already matches {@code + * getFullName()} as-is. */ private static String jmcStyleName(Class targetClass) { int dimensions = 0; diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java index 30e7537c53..d33072a588 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java @@ -5,7 +5,6 @@ package com.datadoghq.profiler.referencechains; -import org.junit.jupiter.api.Assumptions; import org.junit.jupiter.api.Test; import org.openjdk.jmc.common.IMCType; import org.openjdk.jmc.common.item.IAccessorKey; @@ -15,7 +14,6 @@ import org.openjdk.jmc.common.item.IMemberAccessor; import org.openjdk.jmc.common.item.IType; import org.openjdk.jmc.common.item.ItemFilters; -import org.openjdk.jmc.common.unit.IQuantity; import org.openjdk.jmc.flightrecorder.CouldNotLoadRecordingException; import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit; @@ -27,7 +25,6 @@ import java.util.ArrayList; import java.util.List; import java.util.Map; -import java.util.Properties; import static org.junit.jupiter.api.Assertions.assertEquals; import static org.junit.jupiter.api.Assertions.assertNotNull; @@ -35,53 +32,60 @@ import static org.junit.jupiter.api.Assertions.fail; /** - * Verifies JMC resolves {@code datadog.ReferenceChain}'s {@code chain} field - declared in - * jfrMetadata.cpp as {@code field("chain", T_CLASS, ..., F_CPOOL | F_ARRAY)}, an array of - * constant-pool {@code T_CLASS} indices. Neither scalar F_CPOOL fields (e.g. {@code objectClass}) - * nor F_ARRAY-of-struct fields (e.g. {@code jdk.StackTrace#frames}) cover this combination. + * PROF-15341 design doc, Open Question: does JMC's parser actually resolve the {@code + * datadog.ReferenceChain} event's {@code chain} field - declared in jfrMetadata.cpp as {@code + * field("chain", T_CLASS, ..., F_CPOOL | F_ARRAY)}, i.e. an array of scalar + * constant-pool-index {@code T_CLASS} values - the same way it resolves a plain scalar + * F_CPOOL field (e.g. {@code objectClass}, already exercised by {@code AbstractProfilerTest}) + * or a plain F_ARRAY-of-composite-struct field (e.g. {@code jdk.StackTrace#frames})? Neither + * already-exercised shape proves this exact combination. * - *

    Loads the .jfr produced by the companion gtest ({@code referenceChainJfrRoundtrip_ut.cpp}) - * directly, with no live profiler, and asserts the seeded class names in leaf-to-root order. + *

    This test loads the standalone .jfr file produced by the companion gtest ({@code + * ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp}) directly via {@link + * JfrLoaderToolkit} - no live profiler attach, no {@code AbstractProfilerTest} lifecycle - and + * asserts the {@code chain} field resolves to the exact class names that gtest seeded, in the + * exact leaf-to-root order {@code ReferenceChainTracker::buildChainEvent()} (referenceChains.h) + * produces. * *

    Why a generic accessor, not {@code Attribute.attr(...)}: JMC's v1 chunk parser - * ({@code ArrayReader#getContentType()}) registers {@code UnitLookup.UNKNOWN} as the content type - * of every array field, so it cannot be bound via a typed {@code Attribute}. Looking it up by - * identifier via {@code IType#getAccessorKeys()} still goes through {@code ArrayReader}'s - * per-element {@code PoolReader} resolution - the thing this test exists to prove. + * (internal.parser.v1.ValueReaders.ArrayReader#getContentType()) registers {@code + * UnitLookup.UNKNOWN} as the declared content type for every array field, regardless of + * what its element reader resolves to - this is generic to all array fields, not specific to the + * cpool case. A field registered as UNKNOWN cannot be bound via {@code + * Attribute.attr(id, name, desc, CLASS).getAccessor(type)} (that requires the field's registered + * content type to match). This test instead looks the field up by identifier via {@code + * IType#getAccessorKeys()} and calls {@code IType#getAccessor(IAccessorKey)} directly - the same + * lower-level lookup JMC's own UI uses for fields it has no compile-time-known attribute for. + * This is not a workaround for a missing capability; it is the correct API for an unregistered + * custom field, and it still calls through the very code + * ({@code ArrayReader.read()}/{@code resolve()} delegating per-element to the field's element + * reader, which for {@code chain} is a {@code PoolReader}) that resolves each array element's + * constant-pool index to its class - the actual thing this test exists to prove. */ public class ReferenceChainJfrParserTest { private static final String EVENT_TYPE = "datadog.ReferenceChain"; - /** Set by the build for both this test and the companion gtest (see build.gradle.kts). */ - private static final String ROUNDTRIP_JFR_ENV = "DDPROF_REFERENCE_CHAIN_ROUNDTRIP_JFR"; + /** + * Same path {@code chainRoundtripJfrPath()} in the companion gtest resolves to: the OS temp + * dir (TMPDIR, falling back to /tmp), agreed by both sides rather than by a shared build + * directory - the gtest (ddprof-lib) and this test (ddprof-test) are different Gradle + * modules/tasks with no other filesystem contract between them. + */ + private static Path roundtripJfrPath() { + String tmp = System.getenv("TMPDIR"); + String dir = (tmp != null && !tmp.isEmpty()) ? tmp : "/tmp"; + return Paths.get(dir, "datadog_reference_chain_roundtrip.jfr"); + } @Test public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() throws IOException, CouldNotLoadRecordingException { - String configured = System.getenv(ROUNDTRIP_JFR_ENV); - Assumptions.assumeTrue(configured != null && !configured.isEmpty(), - ROUNDTRIP_JFR_ENV + " is not set - this test only runs from the Gradle test tasks"); - Path jfrPath = Paths.get(configured); - // Assumption, not assertion: the producing gtest does not run on CI runners without Google - // Test (e.g. the el7 testRelease job) or with -Pskip-gtest. The build deletes the file before - // the gtest runs, and when the gtest is skipped, so an existing file is always this build's. - Assumptions.assumeTrue(Files.exists(jfrPath), + Path jfrPath = roundtripJfrPath(); + assertTrue(Files.exists(jfrPath), "Expected " + jfrPath + " to exist - run " + ":ddprof-lib:gtestDebug_referenceChainJfrRoundtrip_ut first " + "(referenceChainJfrRoundtrip_ut.cpp produces this file)."); - // The seeded values the companion gtest wrote next to the recording - the - // single source of truth for this test's expectations, so the producer and - // this consumer cannot drift apart silently. - Path expectedPath = Paths.get(configured + ".expected"); - Assumptions.assumeTrue(Files.exists(expectedPath), - "Expected " + expectedPath + " to exist - run " - + ":ddprof-lib:gtestDebug_referenceChainJfrRoundtrip_ut first " - + "(referenceChainJfrRoundtrip_ut.cpp produces this sidecar)."); - Properties expected = new Properties(); - try (InputStream in = Files.newInputStream(expectedPath)) { - expected.load(in); - } IItemCollection events; try (InputStream in = Files.newInputStream(jfrPath)) { @@ -92,7 +96,6 @@ public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() List resolvedChain = null; long targetTag = -1; - long leakTagIncarnation = -1; int depth = -1; for (IItemIterable iterable : chainEvents) { IType type = iterable.getType(); @@ -100,9 +103,6 @@ public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() IMemberAccessor edgesAccessor = findAccessor(type, "edges"); IMemberAccessor targetTagAccessor = findAccessor(type, "targetTag"); IMemberAccessor depthAccessor = findAccessor(type, "depth"); - IMemberAccessor incarnationAccessor = findAccessor(type, "leakTagIncarnation"); - assertNotNull(incarnationAccessor, "No accessor for 'leakTagIncarnation' field on " - + EVENT_TYPE); assertNotNull(chainAccessor, "No accessor for 'chain' field on " + EVENT_TYPE); assertNotNull(edgesAccessor, "No accessor for 'edges' field on " + EVENT_TYPE + " - the new retention-edge label array (T_STRING|F_ARRAY) did not make it " @@ -126,40 +126,39 @@ public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() chain.add((IMCType) element); } resolvedChain = chain; - // Retention-edge labels, one per hop. The gtest has no JNIEnv, so it seeds kind labels - // instead of decoded ones; this checks the array field parses, not the decode - // (covered natively by referenceChains_ut). + // Retention-edge labels: one per chain hop, aligned with it (the + // gtest seeds kind labels because its JNIEnv is null - the label + // DECODE is skipped; the Java side validates the ARRAY FIELD parses, + // not the decode itself, which referenceChains_ut covers natively). Object edgesValue = edgesAccessor.getMember(item); assertNotNull(edgesValue, "'edges' field resolved to null"); assertTrue(edgesValue instanceof Object[], "'edges' field resolved to " + edgesValue.getClass() + ", expected an array"); Object[] rawEdges = (Object[]) edgesValue; - assertEquals(expectedInt(expected, "chain.length"), rawEdges.length, - "edges must align with the chain, one label per hop"); + assertEquals(3, rawEdges.length, "edges must align with the chain, one label per hop"); for (Object e : rawEdges) { assertTrue(e instanceof String, "edges[] element resolved to " + (e == null ? "null" : e.getClass()) + ", expected a String"); } - assertEquals(expected.getProperty("edges.0"), rawEdges[0]); - assertEquals(expected.getProperty("edges.1"), rawEdges[1]); - assertEquals(expected.getProperty("edges.2"), rawEdges[2]); + assertEquals("field", rawEdges[0]); + assertEquals("element", rawEdges[1]); + assertEquals("jni_global", rawEdges[2]); if (targetTagAccessor != null) { Object v = targetTagAccessor.getMember(item); if (v instanceof Number) { targetTag = ((Number) v).longValue(); - } else if (v instanceof IQuantity) { - targetTag = ((IQuantity) v).longValue(); + } else if (v instanceof org.openjdk.jmc.common.unit.IQuantity) { + targetTag = ((org.openjdk.jmc.common.unit.IQuantity) v).longValue(); } } - leakTagIncarnation = longValue(incarnationAccessor.getMember(item)); if (depthAccessor != null) { Object v = depthAccessor.getMember(item); if (v instanceof Number) { depth = ((Number) v).intValue(); - } else if (v instanceof IQuantity) { - depth = (int) ((IQuantity) v).longValue(); + } else if (v instanceof org.openjdk.jmc.common.unit.IQuantity) { + depth = (int) ((org.openjdk.jmc.common.unit.IQuantity) v).longValue(); } } break; // referenceChainJfrRoundtrip_ut.cpp writes exactly one event @@ -170,55 +169,15 @@ public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() } assertNotNull(resolvedChain, "Never iterated a " + EVENT_TYPE + " item"); - assertEquals(expectedInt(expected, "chain.length"), resolvedChain.size(), - "Expected leaf/middle/root - as many entries as the gtest seeded"); + assertEquals(3, resolvedChain.size(), "Expected leaf/middle/root - 3 entries"); // Leaf-to-root order, matching ReferenceChainTracker::buildChainEvent()'s // FrontierTable::reconstructChain() contract and the gtest's insert() calls - // (tag=3 leaf -> tag=2 middle -> tag=1 root). The sidecar carries the gtest's - // slashed internal names; JMC renders IMCType full names with dots. - for (int i = 0; i < resolvedChain.size(); i++) { - assertEquals(expected.getProperty("chain." + i).replace('/', '.'), - resolvedChain.get(i).getFullName(), - "chain[" + i + "] must be the gtest's seeded class in leaf-to-root order"); - } - assertEquals(expectedLong(expected, "targetTag"), targetTag, - "targetTag should be the leaf's frontier tag the gtest seeded"); - assertEquals(expectedInt(expected, "depth"), depth, - "depth should be the leaf's own depth the gtest seeded"); - assertEquals(expectedLong(expected, "leakTagIncarnation"), leakTagIncarnation, - "leakTagIncarnation should carry the event's ownership stamp the gtest seeded"); - } - - // Both sidecar readers report the offending key with the value: a bare parse - // exception names neither, and a MISSING key surfaces as a null parse whose - // built-in message ("null") says nothing about which sidecar entry is absent. - private static int expectedInt(Properties expected, String key) { - String value = expected.getProperty(key); - try { - return Integer.parseInt(value); - } catch (RuntimeException e) { - throw new IllegalStateException( - "malformed or missing '" + key + "' in the roundtrip sidecar (value: " + value + ")", e); - } - } - - private static long expectedLong(Properties expected, String key) { - String value = expected.getProperty(key); - try { - return Long.parseLong(value); - } catch (RuntimeException e) { - throw new IllegalStateException( - "malformed or missing '" + key + "' in the roundtrip sidecar (value: " + value + ")", e); - } - } - - private static long longValue(Object v) { - if (v instanceof Number) { - return ((Number) v).longValue(); - } else if (v instanceof IQuantity) { - return ((IQuantity) v).longValue(); - } - return -1; + // (tag=3 leaf -> tag=2 middle -> tag=1 root). + assertEquals("com.test.ChainLeaf", resolvedChain.get(0).getFullName()); + assertEquals("com.test.ChainMiddle", resolvedChain.get(1).getFullName()); + assertEquals("com.test.ChainRoot", resolvedChain.get(2).getFullName()); + assertEquals(3L, targetTag, "targetTag should be the leaf's frontier tag (3)"); + assertEquals(2, depth, "depth should be the leaf's own depth (2 hops from the root)"); } private static IMemberAccessor findAccessor(IType type, String identifier) { diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java index d50f79c647..0d33e8fba2 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java @@ -7,7 +7,6 @@ import com.datadoghq.profiler.AbstractProfilerTest; import com.datadoghq.profiler.JavaProfiler; -import com.datadoghq.profiler.ReferenceChainTestHooks; import com.datadoghq.profiler.Platform; import org.junit.jupiter.api.Test; @@ -15,10 +14,13 @@ import static org.junit.jupiter.api.Assumptions.assumeTrue; /** - * {@code ReferenceChainTrackingTest} exercises {@code LivenessTracker}'s probabilistic slope - * detection and {@code ReferenceChainTracker}'s root-seeded BFS discovery together, which is - * reliable only when both line up within the same retry window. This class decouples them via the - * debug-build-only seams on {@link JavaProfiler} (javaApi.cpp), verifying each in isolation: + * PROF-15341 follow-up: {@code ReferenceChainTrackingTest} exercises {@code LivenessTracker}'s + * probabilistic allocation-sampling-driven slope detection and {@code ReferenceChainTracker}'s + * root-seeded BFS discovery together, in one real-JVM run - reliable only when both mechanisms + * happen to line up within the same bounded retry window. This class decouples them via the + * debug-build-only test seams on {@link JavaProfiler} (backed by {@code LivenessTracker}'s + * existing {@code *ForTest} seams and a new {@code ReferenceChainTracker::tagAsRootForTest()}, + * see javaApi.cpp), so each mechanism can be verified end-to-end in isolation: *

      *
    • {@link #shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope()} - asserts a slope signal * would fire from directly-seeded population history, with no allocation sampling involved.
      • @@ -27,15 +29,20 @@ * dependency on {@code selectLeakCandidates()} organically picking the right klass. *
    * - *

    Only runs under -DDEBUG native builds (debug/asan/tsan) - the backing native methods are - * no-op stubs in a release build (javaApi.cpp's {@code #ifdef DEBUG} guard). + *

    Only runs under the debug native build ({@code testdebug}) - the backing native methods do + * not exist in a release build (see javaApi.cpp's {@code #ifdef DEBUG} guard), mirroring + * {@code JVMAccessTest}'s own {@code "debug".equals(System.getProperty("ddprof_test.config"))} + * pattern for the same reason. */ public class ReferenceChainTestSeamsTest extends AbstractProfilerTest { - // Arbitrary klass ids, opaque to the population table except when a representative is set: - // that aliases the representative's real class id onto the synthetic id, so the chain test - // targets a unique nested class - a real entry with existing (noisy) history, e.g. - // java.lang.Object's, would outrank the seeded ramp. + // Arbitrary, test-chosen klass ids - opaque keys for the population table, EXCEPT + // where a representative is involved: setKlassPopulationRepresentativeForTest() now + // aliases the representative's REAL class id onto the seeded synthetic id (the + // leak-tag redesign keys every consumer by real ids), so shouldReconstructChainForDirectlyTaggedRoot() + // must target a class whose real population entry does not already exist - a unique + // nested class, not java.lang.Object - otherwise the real entry's genuine (noisy) + // history outranks the seeded ramp and the target never becomes a candidate. private static final int SLOPE_TEST_KLASS_ID = 987001; private static final int CHAIN_TEST_KLASS_ID = 987002; @@ -44,18 +51,26 @@ private static final class ChainTarget {} /** * Durable root for {@link #shouldReconstructChainForDirectlyTaggedRoot()}'s target: the - * noise gate (suppressChainEvent) drops depth<2 chains whose root is transient (stack/JNI - * local), so a static holder is required for the chain event to be emitted at all. + * noise gate (suppressChainEvent) intentionally drops depth<2 chains whose root is + * transient (stack local / JNI local) - a method-local target is transient BY DESIGN, so + * holding it statically (the canonical leak shape: static field) is required for the + * chain event to be emitted at all. Shared-JVM hygiene: nulled in a finally below so the + * next test in this no-forkEvery JVM does not inherit the reference. */ private static Object chainTargetHolder; @Override protected String getProfilerCommand() { - // generations=true: required for selectLeakCandidates() to return anything, real or seeded. - // referencechains=true: constructs the FrontierTable the seams insert into. - // framecap=2000000: the first pass's IterateOverReachableObjects admits every GC root in the - // JVM, and a small framecap fills with them before the tagged root is expanded, abandoning - // with FRONTIER_CAP and no chain event. + // generations=true: gates LivenessTracker's population tracking (gcGenerationsEnabled()) - + // required for selectLeakCandidates() to return anything at all, real or seeded. + // referencechains=true: constructs ReferenceChainTracker's FrontierTable so + // tagAsReferenceChainRoot0()/runReferenceChainPass0() have a table to insert into. + // framecap=2000000 (not 1024): shouldReconstructChainForDirectlyTaggedRoot()'s first pass + // runs IterateOverReachableObjects, which admits every GC root in the whole JVM - not just + // this test's directly-tagged target - into the same frontier. A small framecap fills with + // that ambient root count before the tagged root ever gets to expandFrontier(), hitting + // SearchAbandonReason::FRONTIER_CAP with no chain event queued. Same value/rationale as + // ReferenceChainTrackingTest's own success-path tests (see that class's header comment). return "generations=true,referencechains=true:hops=32:budget=500:ttl=60000:framecap=2000000"; } @@ -65,7 +80,7 @@ protected boolean isPlatformSupported() { } private static void assumeDebugBuild() { - assumeTrue(ReferenceChainAssertions.isDebugInstrumentedBuild()); + assumeTrue("debug".equals(System.getProperty("ddprof_test.config"))); } /** @@ -78,20 +93,25 @@ private static void assumeDebugBuild() { @Test public void shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope() { assumeDebugBuild(); - ReferenceChainTestHooks.resetKlassPopulationForTest0(); - ReferenceChainTestHooks.setGcGenerationsEnabled0(true); - - // KLASS_POPULATION_MIN_FILL_FOR_TREND = 10 only makes a trend eligible; selectLeakCandidates() - // also needs LEAK_TREND_HYSTERESIS_BASE = 5 consecutive qualifying epochs, so at least - // 10 + (5 - 1) = 14 increasing samples are needed; 20 gives headroom. + JavaProfiler.resetKlassPopulationForTest0(); + JavaProfiler.setGcGenerationsEnabled0(true); + + // KLASS_POPULATION_MIN_FILL_FOR_TREND = 10 (livenessTracker.h) is only the floor at which a + // trend becomes eligible at all - selectLeakCandidates() also requires consecutive_positive + // to reach LEAK_TREND_HYSTERESIS_BASE = 5 consecutive qualifying epochs before trusting it + // (the sustained-trend hysteresis gate), so at least 10 + (5 - 1) = 14 strictly increasing + // samples are needed; 20 gives headroom. for (int epoch = 1; epoch <= 20; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0(SLOPE_TEST_KLASS_ID, epoch * 10, epoch); - // selectLeakCandidates() also requires a qualifying allocating thread. No tracked instance - // needs to match here, so a fixed synthetic tid suffices. - ReferenceChainTestHooks.seedTidTrendSample0(SLOPE_TEST_KLASS_ID, 4242, epoch * 3, epoch); + JavaProfiler.seedKlassPopulationSample0(SLOPE_TEST_KLASS_ID, epoch * 10, epoch); + // Per-(klass, tid) qualification: selectLeakCandidates() now requires a + // qualifying allocating thread on top of the klass-level ramp. This test + // only asserts the klass makes it into the candidate list - it has no + // tracked instances whose tid a tagging scope would need to match - so a + // fixed synthetic tid suffices here. + JavaProfiler.seedTidTrendSample0(SLOPE_TEST_KLASS_ID, 4242, epoch * 3, epoch); } - int[] candidates = ReferenceChainTestHooks.selectLeakCandidateKlassIds0(); + int[] candidates = JavaProfiler.selectLeakCandidateKlassIds0(); boolean found = false; for (int klassId : candidates) { if (klassId == SLOPE_TEST_KLASS_ID) { @@ -109,63 +129,92 @@ public void shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope() { * seeded leak candidate's representative, then drives one BFS pass and one poll cycle * synchronously. This is the "trigger the refchain on a known live heap sample" seam: it * proves {@code runPass()}/{@code pollWatchedTargets()}/{@code buildChainEvent()} correctly - * produce a chain event whose leaf is this test's {@link ChainTarget}, decoupled from whether - * LivenessTracker's probabilistic sampler would have picked the same object on its own. Only - * chains with a {@code ChainTarget} leaf count, so a chain another test left cached in this - * shared JVM cannot satisfy the assertion. + * produce a chain event for a target this test controls directly, decoupled from whether + * LivenessTracker's probabilistic sampler would have picked the same object on its own. */ @Test public void shouldReconstructChainForDirectlyTaggedRoot() { assumeDebugBuild(); - ReferenceChainTestHooks.resetKlassPopulationForTest0(); - ReferenceChainTestHooks.setGcGenerationsEnabled0(true); - // Guards against inheriting a full/tiny FrontierTable from an earlier test in this - // no-forkEvery JVM (e.g. ReferenceChainTrackingTest's framecap=1 abandonment test), against - // which tagAsReferenceChainRoot0()'s insert() could fail. - ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); - - // Referenced only through the static holder, never a local: a local would make the target a - // stack-local GC root for the whole test body, and the noise gate suppresses chains rooted in - // a transient stack slot. + JavaProfiler.resetKlassPopulationForTest0(); + JavaProfiler.setGcGenerationsEnabled0(true); + // Guards against inheriting a FrontierTable an earlier test in this same, no-forkEvery + // JVM left permanently full/tiny - e.g. ReferenceChainTrackingTest's own + // shouldReportAbandonedSearchOnTinyFrontierCap deliberately drives the shared table to + // framecap=1 and leaves it that way. Same defensive pattern that class's own tests already + // use (see its header comment); without it, tagAsReferenceChainRoot0()'s insert() below can + // fail against a table this test never sized itself. + JavaProfiler.resetReferenceChainSearchForTest0(); + + // The target is referenced ONLY through the static holder - never bound to a + // live local of this frame. A local `target` variable would make the object a + // STACK_LOCAL GC root for the whole test body, and the noise gate (rightly) + // suppresses depth-0 chains rooted in a transient stack slot: the durable + // roots this fixture wants (the static holder, plus the JNI-global-weak-ref + // root LivenessTracker's representative itself creates) then lose the + // durability race only if a stack-local root exists at all. Accessing the + // object only via the static field leaves its frame slots empty between + // calls, so no stack root is ever enumerated. chainTargetHolder = new ChainTarget(); - // Representative before seeding: setting it registers the synthetic->real id alias, so the - // seeds land under the target's real class id. - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(CHAIN_TEST_KLASS_ID, chainTargetHolder); + // Representative BEFORE seeding: with the aliasing seam, setting the representative is + // what registers the synthetic->real id alias, so the seeding below lands re-keyed under + // the target's real class id (seeding first still works - the synthetic entry gets + // re-keyed at representative-set time - but rep-first is the documented load-bearing order). + JavaProfiler.setKlassPopulationRepresentativeForTest0(CHAIN_TEST_KLASS_ID, chainTargetHolder); - // 20 epochs to clear the hysteresis gate - see the slope test above. + // See shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope()'s comment above for why 20 + // (not just KLASS_POPULATION_MIN_FILL_FOR_TREND = 10) is needed to clear the hysteresis gate. for (int epoch = 1; epoch <= 20; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0(CHAIN_TEST_KLASS_ID, epoch * 10, epoch); - // This thread's real tid, since the target was allocated here. Belt-and-braces: the - // chain's primary path is the directly-tagged root plus the seeded representative. - ReferenceChainTestHooks.seedTidTrendSample0( - CHAIN_TEST_KLASS_ID, ReferenceChainTestHooks.getTid(), epoch * 3, epoch); + JavaProfiler.seedKlassPopulationSample0(CHAIN_TEST_KLASS_ID, epoch * 10, epoch); + // Per-(klass, tid) qualification, seeded with THIS thread's real + // profiler tid: the target was allocated here, so if any path in the + // pass/poll cycle below does hinge on leak tagging of the target as a + // tracked instance, the qualifying tid matches it. (The chain's primary + // path is the directly-tagged frontier root + seeded representative, so + // this is belt-and-braces, not a proven requirement.) + JavaProfiler.seedTidTrendSample0( + CHAIN_TEST_KLASS_ID, JavaProfiler.getTid(), epoch * 3, epoch); } - // Poll before the direct tag: it admits the seeded klass as a watched candidate, and - // tagAsRootForTest's recordDiscoveredInstance only lands when a candidate slot already - // watches the klass. - ReferenceChainTestHooks.pollReferenceChainTargets0(); - - long tag = ReferenceChainTestHooks.tagAsReferenceChainRoot0(chainTargetHolder); + // One poll BEFORE the direct tag: the first pollReferenceChainTargets0() + // admits the seeded klass as a watched candidate (canary slot), and the + // seam's discovery recording (tagAsRootForTest's recordDiscoveredInstance) + // only lands when a candidate slot already watches the klass - the + // leak-tag redesign removed the marker-tag path the original pre-poll tag + // used to ride. + JavaProfiler.pollReferenceChainTargets0(); + + // The target is referenced ONLY through the static holder - never bound to a + // live local of this frame. A local `target` variable would make the object a + // STACK_LOCAL GC root for the whole test body, and the noise gate (rightly) + // suppresses depth-0 chains rooted in a transient stack slot: the durable + // roots this fixture wants (the static holder, plus the JNI-global-weak-ref + // root LivenessTracker's representative itself creates) then lose the + // durability race only if a stack-local root exists at all. Accessing the + // object only via the static field leaves its frame slots empty between + // calls, so no stack root is ever enumerated. + long tag = JavaProfiler.tagAsReferenceChainRoot0(chainTargetHolder); assertTrue(tag > 0, "Expected tagAsReferenceChainRoot0 to assign a valid frontier tag"); - // One pass is not enough: admitStaticFieldRoots() sweeps loaded classes in budget-bounded - // chunks, and the target's durable root_kind is only discovered on the pass whose chunk - // covers ChainTarget's holder class. 40 passes give several full sweep laps of headroom - // (~10 passes for ~4000 classes). The engine lock (runPassSerialized/ - // pollWatchedTargetsSerialized) keeps the BFS thread from racing these calls. + // Drive pass+poll cycles until the chain event lands. One pass is NOT enough: + // admitStaticFieldRoots() sweeps loaded classes in chunks (a few hundred per pass, + // bounded by the budget) and the first pass truncates before reaching this test's + // class - the durable (static-field) root discovery that upgrades the target's + // root_kind only happens on the pass whose chunk covers ChainTarget's holder class. + // The bound (40) gives the full sweep lap (~10 passes for ~4000 loaded classes) + // several round trips of headroom; the BFS thread is excluded from racing these + // calls by the engine lock (runPassSerialized/pollWatchedTargetsSerialized). int eventCount = 0; for (int pass = 0; pass < 40 && eventCount == 0; pass++) { - boolean sawPassRun = ReferenceChainTestHooks.runReferenceChainPass0(); + boolean sawPassRun = JavaProfiler.runReferenceChainPass0(); assertTrue(sawPassRun || pass > 0, "Expected the first runReferenceChainPass0 to run (reference chains enabled)"); - ReferenceChainTestHooks.pollReferenceChainTargets0(); - eventCount = ReferenceChainTestHooks.drainReferenceChainEventCountForLeaf0(chainTargetHolder); + JavaProfiler.pollReferenceChainTargets0(); + eventCount = JavaProfiler.drainReferenceChainEventCount0(); } assertTrue(eventCount > 0, - "Expected pollWatchedTargets() to have queued at least one chain event whose leaf is " - + "ChainTarget (the directly-tagged, seeded-representative target)"); + "Expected pollWatchedTargets() to have queued at least one chain event for the " + + "directly-tagged, seeded-representative target"); chainTargetHolder = null; // shared-JVM hygiene } } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java index 867e02af18..c3fc86ec6b 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java @@ -6,7 +6,7 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.AbstractProfilerTest; -import com.datadoghq.profiler.ReferenceChainTestHooks; +import com.datadoghq.profiler.JavaProfiler; import com.datadoghq.profiler.JfrEvent; import com.datadoghq.profiler.JfrEvents; import com.datadoghq.profiler.Platform; @@ -15,17 +15,17 @@ import org.junit.jupiter.api.Tag; import org.junit.jupiter.api.Test; import org.junit.jupiter.api.TestMethodOrder; +import org.junitpioneer.jupiter.RetryingTest; import java.nio.file.Files; import java.util.concurrent.LinkedBlockingQueue; import java.util.concurrent.Semaphore; -import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicLong; import java.nio.file.Path; import java.nio.file.Paths; import java.util.ArrayList; import java.util.HashMap; import java.util.List; -import java.lang.reflect.Method; import java.util.Map; import static org.junit.jupiter.api.Assertions.assertEquals; @@ -33,121 +33,239 @@ import static org.junit.jupiter.api.Assertions.assertTrue; /** - * End-to-end coverage for {@code ReferenceChainTracker} (referenceChains.h/.cpp) against a real - * JVM, real GCs and a real JVMTI heap walk. {@code Profiler::dump()} emits - * {@code datadog.ReferenceChainAbandoned} once the search has ended in - * {@code SearchState::ABANDONED}; {@code pollWatchedTargets()} emits {@code datadog.ReferenceChain} - * for ranked {@code selectLeakCandidates()} klasses whose representative a {@code runPass()} walk - * has already tagged ({@code getTag() > 0} - a read, never a {@code SetTag} seed). + * PROF-15341 (+ lifecycle-wiring follow-up, + the Remaining Work Plan's target-selection bridging, + * pause-time pacing, and reporting work): end-to-end + * coverage for {@code ReferenceChainTracker} (ddprof-lib/src/main/cpp/referenceChains.h/.cpp). * - *

    Why {@code @TestMethodOrder}: {@code ReferenceChainTracker} is a process-wide - * singleton. Leaving {@code SearchState::RUNNING} releases every tag the search assigned - * ({@code releaseSearchTags()}), and its {@code FrontierTable} is sized only by the first - * {@code start()} in this JVM ({@code if (_frontier == nullptr)} guard; no {@code forkEvery}, see - * {@code ProfilerTestPlugin.kt}). {@link #shouldReportAbandonedSearchOnTinyFrontierCap()} drives - * the search to {@code ABANDONED}, while both success-path tests need it {@code RUNNING} to see - * non-zero tags and have no fallback for losing that race, so they run first - * ({@code @Order(1)}/{@code @Order(2)}). Their relative order does not matter: they target - * different klasses ({@link ChainLink} vs {@link CachedPayload}) and neither exhausts the search. + *

    Scope note: {@code ReferenceChainTracker::start()} is now called from + * {@code Profiler::start()} (profiler.cpp), gated on {@code args._reference_chains}, followed by + * {@code ReferenceChainTracker::startThread()} which spawns its BFS thread; {@code Profiler::stop()} + * calls the matching {@code stopThread()}/{@code stop()} pair. A {@code datadog.ReferenceChainAbandoned} + * event now reaches a live {@code Recording}: {@code Profiler::dump()} calls + * {@code buildAbandonedEvent()} and writes its output via + * {@code Profiler::writeReferenceChainAbandoned()}/{@code FlightRecorder::recordReferenceChainAbandoned()} + * whenever the search has ended in {@code SearchState::ABANDONED} - mirroring the + * {@code LivenessTracker::flush()} call site there. {@link #shouldReportAbandonedSearchOnTinyFrontierCap()} + * exercises that path end-to-end below. + * + *

    {@code buildChainEvent()}'s target-selection feed (Remaining Work Plan's target-selection + * bridging step): + * {@code ReferenceChainTracker::pollWatchedTargets()} (referenceChains.cpp), called from + * {@code threadLoop()} once per scheduling cycle after {@code runPass()}, closes the gap this class's + * header comment used to describe as unclosed. It polls + * {@code LivenessTracker::selectLeakCandidates()} (positive population-slope ranking over a rolling + * per-klass survivor-count window, gated on {@code _gc_generations} - design doc's Open Question 3) + * and, for each ranked klass whose representative instance an ordinary {@code runPass()} walk has + * *already* tagged ({@code getTag() > 0} - a read, never a {@code SetTag} seed), reconstructs and + * emits its chain via {@code Profiler::writeReferenceChain()}. {@link #shouldReconstructReferrerChainToGcRoot()} + * below exercises this end to end against a real JVM, real GCs, and a real JVMTI heap walk - not a + * synthetic frontier fixture (see {@code referenceChainJfrRoundtrip_ut.cpp}/{@code ReferenceChainJfrParserTest} + * for that already-covered, lower-level reconstruction-correctness proof). + * + *

    Why {@code @TestMethodOrder}/{@code @Order(1)}: {@code ReferenceChainTracker} is a + * process-wide singleton whose single, singleton-owned search (design doc's Open Question 3 + * "Shipped" note) never restarts once it leaves {@code SearchState::RUNNING} - + * {@code shouldRunPass()} (referenceChains.cpp) returns {@code false} forever after that point, and + * the transition itself releases every tag the search ever assigned + * ({@code releaseSearchTags()}). Its {@code FrontierTable} is sized once, the first time any test + * in this JVM calls {@code ReferenceChainTracker::start()}, and never resized on later + * start()/stop() cycles (referenceChains.cpp's {@code if (_frontier == nullptr)} guard) - so + * whichever test runs first also fixes that capacity for every test that runs after it in the same + * JVM (no {@code forkEvery} configured, see {@code ProfilerTestPlugin.kt}, so this whole class runs + * in one). {@link #shouldReportAbandonedSearchOnTinyFrontierCap()} below deliberately drives that + * shared search to {@code SearchState::ABANDONED}, via an artificially tiny frontier cap when it + * gets to build the table itself, or its own {@code ttl} fallback otherwise (see that method's own + * comment). Both {@link #shouldReconstructReferrerChainToGcRoot()} and + * {@link #shouldReconstructReferrerChainThroughUnboundedCacheLeak()} need the search still + * {@code RUNNING} to find their own candidates' tags non-zero, so they are pinned to run first, + * via {@code @Order(1)}/{@code @Order(2)} respectively - without that ordering all three tests + * would race for which ones get to observe a still-{@code RUNNING} search, and neither + * success-path test has a fallback for losing that race the way the abandonment test does. The + * relative order between the two success-path tests does not itself matter - both target + * different klasses ({@link ChainLink} vs {@link CachedPayload}) within the same shared search, + * and neither exhausts it - only their both running before the abandonment test does. */ @TestMethodOrder(MethodOrderer.OrderAnnotation.class) @Tag("slow") public class ReferenceChainTrackingTest extends AbstractProfilerTest { - // Arbitrary klass ids for the debug-only population-seeding seams. Distinct from each other and - // from ReferenceChainTestSeamsTest's ids to avoid collisions in the shared, no-forkEvery JVM. + // Arbitrary, test-chosen klass ids for the debug-only population-seeding seams below (see + // ReferenceChainTestSeamsTest's own comment: LivenessTracker's population table treats these as + // opaque keys, so they need not resolve to any real class). Distinct per test/from + // ReferenceChainTestSeamsTest's own ids purely as cheap insurance against collision in a shared, + // no-forkEvery test JVM. private static final int CHAIN_LINK_TEST_KLASS_ID = 987201; private static final int CACHED_PAYLOAD_TEST_KLASS_ID = 987202; - // Static, not local: the discovered-chain gate suppresses shallow chains rooted at a transient - // root (stack/JNI local), and ChainLinks at depth 1 of a locally-held list are exactly that - // shape. (CachedPayload chains go three hops through HashMap internals, which the gate lets - // through regardless of root kind.) Cleared in the test's finally so it does not keep its - // population reachable for later tests in this shared JVM. + // Durable (static-field) holder for the gc-root fixture below. The + // discovered-chain gate suppresses chains shallower than the first real + // holder hop that are rooted at a TRANSIENT root (stack/JNI local) - a + // frame-held "leak" is by definition not a leak - and + // shouldReconstructReferrerChainToGcRoot()'s ChainLink instances sit at + // depth 1 of a locally-held list, exactly the transient-rooted shape the + // gate exists to suppress. A static field gives them the real + // unmaintained-singleton-collection retention shape instead. (The cache + // fixture below needs no such change: its CachedPayload chains are three + // hops deep through HashMap's own internals, which the gate correctly + // lets through regardless of root kind.) Cleared in the test's finally: + // this is a shared, no-forkEvery test JVM, and a leftover holder would + // keep its entire population reachable for every later test here. private static List gcRootHolder; - // consecutive_positive only starts incrementing once ring_fill reaches - // KLASS_POPULATION_MIN_FILL_FOR_TREND=10 (ringThirdsStats()'s fill < min_fill guard resets it to - // 0 before that), and selectLeakCandidates() needs it at LEAK_TREND_HYSTERESIS_BASE=5 (or 3 when - // heapFloorRising() corroborates). hasLeakSignal() - which shouldRunPass() gates even the first - // pass on under generations=true - consults that. 10 + 5 - 1 = 14 seeded epochs is the minimum; - // +1 for margin. + // The current round's allocation batch, handed to the persistent allocator + // thread below. Volatile: written here, read by the allocator thread every + // round - the request queue's happens-before (offer after set, take before + // read) already covers it, but the visibility of a plain field handed + // across threads is kept explicit rather than relying on queue semantics + // alone. + private static volatile List currentBatch; + + // LivenessTracker's own hysteresis gate (livenessTracker.h's + // KLASS_POPULATION_MIN_FILL_FOR_TREND=10 / LEAK_TREND_HYSTERESIS_BASE=5; + // livenessTracker.cpp's recordKlassPopulationSampleLocked()/hasQualifyingGrowth()) only starts + // incrementing KlassPopulationEntry::consecutive_positive once ring_fill has reached 10 - every + // call before that resets it straight back to 0 (ringThirdsStats()'s own fill < min_fill guard). + // A single batch of exactly 10 seedKlassPopulationSample0() calls therefore caps + // consecutive_positive at 1 (only the 10th call ever sees ring_fill==10), far short of the >=5 + // (or >=3 if LivenessTracker::heapFloorRising() independently corroborates) that + // selectLeakCandidates() (livenessTracker.cpp) requires before it reports a candidate at all - + // which is what ReferenceChainTracker::hasLeakSignal() consults, and what shouldRunPass() + // (referenceChains.cpp) gates even this search's very first pass on whenever generations=true + // (see this class's own header comment on why runPass() never otherwise fires here without one). + // 10 (KLASS_POPULATION_MIN_FILL_FOR_TREND) + 5 (LEAK_TREND_HYSTERESIS_BASE) - 1 = 14 calls are + // the minimum for the 5 qualifying calls at ring_fill>=10 (epochs 10-14) to actually land; +1 + // for margin against off-by-one uncertainty in that derivation. private static final int SEED_EPOCHS_FOR_HYSTERESIS = 15; - // Dedicated id for shouldReportAbandonedSearchOnTinyFrontierCap()'s seeding, for the same - // collision-avoidance reason as the ids above. + // Dedicated id for shouldReportAbandonedSearchOnTinyFrontierCap()'s own seeding (see that + // method's own comment) - distinct from CHAIN_LINK_TEST_KLASS_ID/CACHED_PAYLOAD_TEST_KLASS_ID + // for the same cheap-insurance-against-collision reason those two are distinct from each other. private static final int ABANDON_TEST_KLASS_ID = 987203; - // T_REFERENCE_CHAIN in jfrMetadata.h - the jdk.ActiveSetting "id" written by flightRecorder.cpp's - // writeBoolSetting(buf, T_REFERENCE_CHAIN, "enabled", ...). Must stay in sync with that enum. - private static final long REFERENCE_CHAIN_EVENT_ID = 129; - @Override protected String getProfilerCommand() { String testName = testInfo != null - ? testInfo.getTestMethod().map(Method::getName).orElse("") + ? testInfo.getTestMethod().map(java.lang.reflect.Method::getName).orElse("") : ""; if ("shouldReconstructReferrerChainToGcRoot".equals(testName) || "shouldReconstructReferrerChainThroughUnboundedCacheLeak".equals(testName)) { - // generations=true: pollWatchedTargets() does nothing unless - // LivenessTracker::gcGenerationsEnabled() is true; referencechains=... alone stays - // whole-graph-only. A large framecap avoids FRONTIER_CAP abandonment against this JVM's - // real root-reachable graph, and a long ttl avoids TTL abandonment mid-test - either would - // call releaseSearchTags() and zero every tag this test depends on. + // memory=...:l + generations=true: LivenessTracker::gcGenerationsEnabled() (Remaining + // Work Plan's population tracking / target-selection bridging, livenessTracker.h) must be true for pollWatchedTargets() + // (referenceChains.cpp) to do anything at all - referencechains=... alone stays + // whole-graph-only (design doc's Open Question 3 "still undecided" fallback). A small + // sampling interval maximizes the chance the many ChainLink instances this test + // allocates below actually get liveness-tracked (LivenessTracker::track(), invoked from + // the allocation-sampling path whenever _gc_generations || _record_liveness is set, + // objectSampler.cpp). A large framecap avoids an early + // SearchAbandonReason::FRONTIER_CAP abandonment against this JVM's real, + // not-controlled-by-this-test root-reachable graph size, and a long ttl avoids a + // TTL abandonment mid-test - either would call releaseSearchTags() and permanently + // zero every tag this test depends on (see this class's header comment on why this + // test is pinned to @Order(1)). // - // pausetarget=5000: measured FollowReferences/GetObjectsWithTags latency starts ~150ms and - // climbs past 1s as cumulative progress grows (each pass re-scans the discovered set). - // Against the default 5ms ceiling (DEFAULT_REFERENCE_CHAINS_PAUSE_TARGET_MS) updatePacing() - // settles at MIN_EFFECTIVE_BUDGET=50 edges/pass and MAX_EFFECTIVE_CADENCE_NS=4s, too slow - // for this test's wall-clock budget; a merely generous ceiling only postpones that. A - // ceiling above the expected peak per-pass cost keeps _effective_budget at budget=4000. + // pausetarget=5000: the pause-time pacing controller's updatePacing() (referenceChains.cpp) measures this JVM's real + // FollowReferences/GetObjectsWithTags call latency at ~150ms early on, climbing past a full + // second as this test's own allocation keeps handing the search more to discover (each pass + // re-scans the whole already-discovered/tagged set, so cost grows with cumulative progress, + // not with this test's own allocation *rate*) - i.e. that latency is dominated by per-call + // overhead, not by the requested edge budget. Against the default pausetarget=5ms ceiling + // (DEFAULT_REFERENCE_CHAINS_PAUSE_TARGET_MS, arguments.h) every observed pass is "over + // ceiling even at the floor", so the controller settles at MIN_EFFECTIVE_BUDGET=50 edges/pass + // and MAX_EFFECTIVE_CADENCE_NS=4s between passes - a real but glacial discovery rate this + // test's own wall-clock budget cannot outwait, and one a merely-generous ceiling (e.g. 500ms) + // only postpones: once cumulative progress pushes the real per-pass cost back past *that* + // ceiling too, the same throttling recurs. A ceiling comfortably above the highest per-call + // cost this test's own scale of population growth is expected to reach instead lets the + // controller keep _effective_budget at this test's own configured budget=4000 ceiling for + // the method's entire run, the same convergence behavior referenceChains_ut.cpp's own pacing + // tests already exercise synthetically. // - // painbudget=100: the @Order(2) test needs a search restart (canAffordNewSearch()) after - // the @Order(1) search terminates. PainBudget (painBudget.h) gates that on - // pain_spent_ms / refill_rate of cooldown, which at the default 1% refill can run to - // minutes - past this test's bounded retry loop. Nothing else here competes for the budget. + // painbudget=100: shouldReconstructReferrerChainThroughUnboundedCacheLeak shares this + // singleton search with shouldReconstructReferrerChainToGcRoot (@Order(1), runs first) and + // needs a restart (canAffordNewSearch(), referenceChains.cpp) once that first search + // reaches a terminal state. PainBudget (painBudget.h) gates that restart on + // pain_spent_ms / refill_rate milliseconds of cooldown; the default + // DEFAULT_REFERENCE_CHAINS_PAIN_BUDGET_PERCENT=1 (1% refill) can make that cooldown run to + // tens of seconds to minutes for a search this large - far past this test's own bounded + // retry loop (16 rounds plus a short grace period). painbudget=100 keeps the restart gate + // affordable immediately, which is fine here since nothing else in this JVM is competing + // for the pain budget. // - // firstpassbudget=200000: root enumeration (runPassManualWalk()'s - // IterateOverReachableObjects) otherwise shares budget=4000, which was observed exhausting - // on other roots' subtrees before ever admitting an edge from this thread's stack (where - // the cache test's HashMap lives). Raising only the root-enumeration budget leaves the - // steady-state expansion pacing (updatePacing()) untouched. - // - // memory=64:l:1.0 - the explicit 100% live-sample ratio is load-bearing: the default 10% - // (_live_samples_ratio, arguments.h) makes LivenessTracker::track() drop 90% of tracked - // instances, thinning the representative and trend pools (observed as intermittent - // "representative died/evicted" and zero-tag runs). Tracking volume is still capped by the - // 256KiB sampling-interval floor, so the table stays small. + // firstpassbudget=200000: root/stack-ref enumeration (runPassManualWalk()'s + // IterateOverReachableObjects call) shares budget=4000 with expandFrontier()'s steady-state + // expansion unless overridden - in this shared, forked test JVM's real (not controlled by + // this test) root-reachable graph, that leaves this method's own CachedPayload-holding + // cache HashMap (a direct stack-local root on this test's own thread) at the mercy of + // whatever order JVMTI's enumeration happens to visit roots in: budget=4000 was observed + // exhausting itself on other roots' subtrees every single attempt, never once admitting a + // single edge from this thread's own stack. Overriding just root enumeration's own budget + // (not budget=4000, which the pacing controller has already been tuned around - raising it + // instead throttles every expansion pass down to + // MIN_EFFECTIVE_BUDGET/MAX_EFFECTIVE_CADENCE_NS, see updatePacing()) gives every root + // enumeration attempt (the first pass, and any later one ROOT_ENUM_MIN_INTERVAL_NS gates + // back in - see that constant's own comment) enough headroom to reach this thread's stack + // without slowing down the steady-state expansion passes that follow. + // memory=64:l:1.0 - the explicit 100% live-sample ratio is load-bearing: + // without a ratio segment the default is 10% (arguments.h's + // _live_samples_ratio) and LivenessTracker::track() drops 90% of + // tracked instances probabilistically, thinning the pool the + // representative-minting and candidate trend rings draw from - + // observed live as the intermittent "representative died/evicted" + // and zero-tag runs (see LeakTagCorrelationReferenceChainTest's own + // comment for the full lottery analysis). Total tracking volume is + // still capped by the 256KiB sampling-interval floor, not the ratio, + // so 100% keeps the tracking table tiny. return "memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=4000:ttl=120000:framecap=2000000:pausetarget=5000:painbudget=100:firstpassbudget=200000"; } - // shouldReportAbandonedSearchOnTinyFrontierCap needs the frontier table, not the per-pass - // budget, to run out first: heapReferenceCallback() checks the budget before - // FrontierTable::insert(), so budget<=framecap completes normally instead of abandoning. A - // larger budget lets a second root-referenced object hit the full table, which runPass() - // abandons on. - // - // framecap=1 only sizes the table if this is the first start() in the JVM - // (`if (_frontier == nullptr)` guard); otherwise @Order(1)'s framecap=2000000 wins. ttl=100 is - // the fallback trigger: _search_start_ns is set when the shared search first started, so on an - // inherited oversized table the ttl check fires almost immediately. Either path produces - // datadog.ReferenceChainAbandoned, which is all this method asserts on. + // shouldReportAbandonedSearchOnTinyFrontierCap needs the frontier table (not the + // per-pass budget) to be what runs out first: heapReferenceCallback() (referenceChains.cpp) + // checks the budget before ever calling FrontierTable::insert(), so a budget as small as + // the frontier cap itself (e.g. budget=1:framecap=1) only ever exhausts the budget after + // admitting exactly one object - insert() never gets a chance to fail, and the search + // completes normally instead of abandoning. A budget comfortably larger than framecap=1 + // lets a *second* root-referenced object reach insert() and hit the actually-full table, + // which is what runPass() treats as grounds to abandon (Termination section priority 1). // - // painbudget=100: restartSearch()/resetSearchStateForTest() both call - // _pain_budget.spend(_search_pain_ms) unconditionally, so the reset below inherits the - // previous long-running search's pain debt; at the default 1% refill, draining it back to - // canStartNow()==true takes minutes, past this method's retry budget. + // framecap=1 only actually controls the table's capacity the *first* time + // ReferenceChainTracker::start() ever constructs its FrontierTable in this JVM + // (referenceChains.cpp's `if (_frontier == nullptr)` guard - the table, like + // LivenessTracker's own, survives every later start()/stop() cycle at whatever size it was + // first built with). This method's own @Order(1) pinning on + // shouldReconstructReferrerChainToGcRoot means *that* test's own, much larger framecap=2000000 + // wins that race instead - so this method also supplies a small ttl as a second, independent + // abandonment trigger. runPass()'s Termination-section priority still checks frontier-cap + // first, so a fresh, genuinely-tiny table (this method running first, e.g. in isolation via + // `-Ptests=ReferenceChainTrackingTest.shouldReportAbandonedSearchOnTinyFrontierCap`) still + // abandons via SearchAbandonReason::FRONTIER_CAP as originally designed; inheriting an + // already-oversized table instead falls through to the ttl check, which fires almost + // immediately regardless of table size because _search_start_ns (referenceChains.h) is set + // once, the first time the shared search ever started - by the time this method's own + // start() call re-parses ttl, that clock already reads however long + // shouldReconstructReferrerChainToGcRoot's own run took. Either path produces a + // datadog.ReferenceChainAbandoned event, which is all this method actually asserts on. // - // memory=64:l:1.0 is load-bearing: Profiler::start() only starts the ReferenceChainTracker - // when allocation sampling activated (activated & EM_ALLOC); a bare referencechains=... falls - // back to cpu-only and never runs the search. No generations=true: LivenessTracker::initialize() - // then clears _gc_generations, so hasLeakSignal() returns true without any population trend. + // painbudget=100, for the same reason shouldReconstructReferrerChainThroughUnboundedCacheLeak() + // above needs it (see that method's own comment on painbudget=100): this method's own + // resetReferenceChainSearchForTest0() call spends whatever _search_pain_ms + // shouldReconstructReferrerChainThroughUnboundedCacheLeak()'s own long-running search left + // behind (found the hard way - that search runs 20+ passes admitting tens of thousands of + // edges each, and nothing zeroes _search_pain_ms between its own end and this method's start() + // reconstructing a fresh, zero-balance PainBudget) into *this* method's own PainBudget + // (referenceChains.cpp's restartSearch()/resetSearchStateForTest(), both call + // _pain_budget.spend(_search_pain_ms) unconditionally) - at the default 1% refill rate, + // draining that debt back to canStartNow()==true would take on the order of minutes, far past + // this method's own retry budget below. painbudget=100 keeps that gate affordable immediately, + // the same way it does for the sibling method. if ("shouldReportAbandonedSearchOnTinyFrontierCap".equals(testName)) { - return "memory=64:l:1.0,referencechains=true:hops=32:budget=500:framecap=1:ttl=100:painbudget=100"; + return "referencechains=true:hops=32:budget=500:framecap=1:ttl=100:painbudget=100"; } - // shouldExposeReferenceChainsSettingWhenEnabled: a referencechains-only command. Arguments::parse() - // implicitly falls back to cpu profiling, whose ActiveSetting is also "enabled"="true", so the - // test also matches on the ActiveSetting "id" (T_REFERENCE_CHAIN, REFERENCE_CHAIN_EVENT_ID). + // Deliberately does not request cpu/wall/memory/nativemem: those categories also + // write an "enabled" ActiveSetting (flightRecorder.cpp:1141-1144) and all default to + // false when not requested, so "enabled"="true" is unambiguous evidence of the + // datadog.ReferenceChain setting specifically without needing to disambiguate by the + // ActiveSetting "id" field (JMC's generic accessor lookup does not resolve that field + // for this custom event type - not worth a bespoke accessor for one assertion). return "referencechains=true:hops=32:budget=500:ttl=2000:framecap=256"; } @@ -162,141 +280,271 @@ protected boolean isPlatformSupported() { /** * Verifies the {@code referencechains=...} flag round-trips through * {@code Arguments} parsing (arguments.cpp's {@code CASE("referencechains")}) into the - * {@code datadog.ReferenceChain} JFR setting (flightRecorder.cpp's + * {@code datadog.ReferenceChain} JFR setting (flightRecorder.cpp:1143's * {@code writeBoolSetting(buf, T_REFERENCE_CHAIN, "enabled", args._reference_chains)}). */ - @Test + @RetryingTest(5) public void shouldExposeReferenceChainsSettingWhenEnabled() { stopProfiler(); JfrEvents settings = verifyEvents("jdk.ActiveSetting"); boolean sawEnabledSetting = false; for (JfrEvent item : settings) { - if (item.getLong("id", -1) == REFERENCE_CHAIN_EVENT_ID - && "enabled".equals(item.getString("name")) - && "true".equals(item.getString("value"))) { + if ("enabled".equals(item.getString("name")) && "true".equals(item.getString("value"))) { sawEnabledSetting = true; - break; } } assertTrue(sawEnabledSetting, "datadog.ReferenceChain#enabled setting was not found"); } /** - * Allocates a growing, statically-held population of {@link ChainLink} instances with a GC and - * dump between rounds until {@code selectLeakCandidates()} trusts the trend, then waits for - * {@code pollWatchedTargets()} to emit the candidate's chain once a {@code runPass()} walk has - * tagged it. + * This test's stated success-path scenario, now exercising the Remaining Work Plan's + * target-selection bridging feed instead of staying disabled: allocates a growing population of + * {@link ChainLink} instances, forcing GCs between allocation rounds so + * {@code LivenessTracker::cleanup_table()}'s epoch-advance pass (livenessTracker.cpp) observes a + * rising per-klass survivor count each time, until {@code selectLeakCandidates()} trusts the + * resulting trend (needs {@code KLASS_POPULATION_MIN_FILL_FOR_TREND = 10} ring-buffer samples). + * Then waits for {@code ReferenceChainTracker::pollWatchedTargets()} to notice that ranked + * candidate has already been tagged by an ordinary {@code runPass()} walk and reconstruct + + * emit its chain, and asserts on the resulting {@code datadog.ReferenceChain} event. * - *

    Each round needs an explicit {@link #dump(Path)}: {@code cleanup_table()}'s per-klass - * population accounting only runs (unforced) via {@code flush_table()} from - * {@code LivenessTracker::flush()}, which is called only from {@code Profiler::dump()} - there - * is no timer-driven flush. {@code System.gc()} bumps {@code _gc_epoch} synchronously in the - * {@code GarbageCollectionFinish} callback, so no sleep is needed between the GC and the dump. + *

    Each population-growth round pairs with an explicit {@link #dump(Path)}: per + * livenessTracker.cpp, {@code cleanup_table()}'s per-klass population accounting only runs + * (unforced) from {@code flush_table()}, which only runs from {@code LivenessTracker::flush()}, + * which is called *only* from {@code Profiler::dump()} - there is no timer-driven flush. + * {@code System.gc()} bumps {@code LivenessTracker::_gc_epoch} synchronously inside the + * {@code GarbageCollectionFinish} callback ({@code onGC()}), so by the time {@code System.gc()} + * returns to Java the epoch bump is already visible - no extra sleep is needed between the + * {@code gc()} and the {@code dump()} that observes it. */ @Test @Order(1) public void shouldReconstructReferrerChainToGcRoot() throws Exception { - // Seed one element *before* resetting the search: ArrayList's backing array starts as the - // shared empty sentinel, and expandFrontier() freezes a node's children when it is expanded - // and never re-examines it. An unrelated GC can wake the restarted BFS thread before round 1's - // addAll(); expanding the holder while still empty would leave every later ChainLink - // unreachable (seen in CI as tag=0 on every poll). Every later grow() copies index 0, so - // whichever array the walk snapshots is non-empty. + // Seed gcRootHolder with one live element *before* resetting the search below: ArrayList's + // backing array starts out as the shared empty-array sentinel, and only gets replaced with a + // real array on its first grow() (addAll()). ReferenceChainTracker::expandFrontier() + // (referenceChains.cpp) freezes whatever children it observes for a node the moment that + // node is expanded - it never re-examines an already-EXPANDED node for a later field mutation, + // regardless of how many times root/stack-ref enumeration itself reruns over the search's + // lifetime (runPassManualWalk()'s own comment). If gcRootHolder's node gets expanded while + // elementData still pointed at the empty sentinel (nothing stops some *unrelated* GC in this + // shared, no-forkEvery JVM from waking the freshly (re)started BFS thread in the gap between + // resetting the search below and round 1's own addAll()), the frozen children set would be + // permanently empty, and no ChainLink added in any of the 16 rounds that follow would ever + // become reachable - matching a real CI failure where pollWatchedTargets() reported tag=0 for + // this klass on every single poll across the whole test. Seeding one element first means the + // backing array is never empty at any point after the search (re)starts: every later + // addAll()/grow() copies all prior elements (including this one) into the new array, so + // whichever array the walk happens to snapshot when it expands the node, index 0 is always + // present in it. gcRootHolder = new ArrayList<>(); gcRootHolder.add(new ChainLink("gc-root-seed")); - if (ReferenceChainAssertions.isDebugInstrumentedBuild()) { - // @Order(1) only orders this class: another test class in this no-forkEvery JVM may have - // left the singleton search non-RUNNING, after which runPass() never takes its root-seeded - // walk again. The population reset is needed for the same reason: _klass_population - // survives stop()/start(), and a leftover klass already past the hysteresis gate would let - // the first pass start regardless of this method's own seeding, masking whether it is - // sufficient. Debug-only: these native seams do not exist in a release build. - ReferenceChainTestHooks.resetKlassPopulationForTest0(); - ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); + if ("debug".equals(System.getProperty("ddprof_test.config"))) { + // Being pinned to run first *within this class* (this class's own header comment, "Why + // @TestMethodOrder/@Order(1)") does not guarantee this is the first reference-chain test + // to ever call into the shared, process-wide singleton ReferenceChainTracker in this whole + // test JVM - no forkEvery is configured (same header comment), so another test class can + // run first and leave the singleton search already non-RUNNING/already-tagged, in which + // case runPass() never takes its real root-seeded-walk branch again. Force a genuine fresh + // search so this test's own ChainLink population is guaranteed reachable by a real walk, + // regardless of what ran earlier in this JVM. Debug-only: this native seam does not exist + // in a release build. + // + // resetKlassPopulationForTest0() first, for the same "no forkEvery" reason: + // LivenessTracker's _klass_population table (livenessTracker.cpp) also survives stop()/ + // start() cycles, so an unrelated earlier test class in this same shared JVM (e.g. another + // generations=true scenario) could leave a klass already past hasLeakSignal()'s + // consecutive_positive hysteresis gate (selectLeakCandidates(), livenessTracker.cpp) + // sitting in that table - which would let this test's first pass start for a reason that + // has nothing to do with the seeding this method does further down (see + // SEED_EPOCHS_FOR_HYSTERESIS's own comment), masking whether that seeding is actually + // sufficient on its own. + JavaProfiler.resetKlassPopulationForTest0(); + JavaProfiler.resetReferenceChainSearchForTest0(); } - // Every ChainLink is allocated by one persistent thread - see PersistentAllocator. - PersistentAllocator allocator = new PersistentAllocator("togcroot-leak-allocator"); + // One persistent allocator thread, reused by every round - NOT a fresh + // spawned thread per round. Same JVMTI property the per-round spawn + // relied on (SampledObjectAlloc never fires for this JUnit worker + // thread's own allocations, but reliably fires for threads created + // after Profiler::start() already ran), plus the decisive per-tid + // consequence: LivenessTracker's per-(klass, tid) qualification trend + // accumulates REAL samples for this one thread's tid every round + // (foldKlassCountsLocked() folds each tracked instance's tid), so + // qualification is organic and cannot age out mid-test. The previous + // per-round spawns gave every round a DIFFERENT short-lived tid, so + // the seeded (klass, worker-tid) qualification ramp was the only + // qualifying signal - and once its ring slots aged out (observed + // live: slope decayed to ~0 at ring_fill=22, consecutive_positive + // reset, the candidate never returned again) the candidate dropped + // out of selectLeakCandidates() with the whole crawl still unfinished. + LinkedBlockingQueue allocRequests = new LinkedBlockingQueue<>(); + Semaphore roundDone = new Semaphore(0); + AtomicLong allocatorTid = new AtomicLong(-1); + Thread allocator = new Thread(() -> { + allocatorTid.set(JavaProfiler.getTid()); + try { + Integer requested; + while ((requested = allocRequests.take()) != null) { + List batch = currentBatch; + for (int i = 0; i < requested; i++) { + batch.add(new ChainLink("leak-" + requested + "-" + i)); + } + roundDone.release(); + } + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); // test shutdown - see finally below + } + }, "togcroot-leak-allocator"); + allocator.start(); + // The seeding block below needs the allocator's tid; the thread publishes + // its own tid as its first action, so this wait is bounded by thread start. + while (allocatorTid.get() == -1) { + Thread.sleep(1); + } Path scratchDumpPath = Paths.get("referencechains-population-scratch.jfr"); try { - // KLASS_POPULATION_MIN_FILL_FOR_TREND = 10 needs 10 epochs that actually observe a surviving - // ChainLink sample, and sampling is probabilistic, so the loop grows per-round counts and - // checks every round instead of committing to a fixed count. Staying under - // KLASS_POPULATION_RING_SIZE = 30 keeps every round within the slope window. Capped at 16 - // because the shared fork (-Xmx512m, no forkEvery) hit "Java heap space" at 25. + // Up to 16 rounds: selectLeakCandidates()'s KLASS_POPULATION_MIN_FILL_FOR_TREND = 10 + // (livenessTracker.h) needs 10 *epochs that actually observe a surviving ChainLink sample*, + // not just 10 dump() calls - allocation sampling is probabilistic (see below), so some + // early, smaller rounds may not land a single ChainLink sample. Growing the per-round count + // compensates, and this loop keeps going (checking for the event every round) rather than + // committing to a fixed round count up front, so it self-adjusts to whatever this JVM's + // actual sampling behavior turns out to be. Staying under KLASS_POPULATION_RING_SIZE = 30 + // keeps every round's sample within the trend computeKlassPopulationSlope() reads back out. + // Capped at 16 rather than a larger margin above the 10-round minimum: this loop's own + // worst case (every round retained, no early match) runs inside the same forked test JVM + // every other ddprof-test class shares (ProfilerTestPlugin.kt's shared -Xmx512m default, + // no forkEvery) - a prior CI run hit "Java heap space" in that shared fork with this loop + // capped at 25, so the cap trades some of the original margin above the 10-round minimum + // for staying inside that shared heap. // - // Growth is clamped at round 10: later rounds only add retries against the lock-contention - // race below (the trend is already eligible), and unclamped growth was what exhausted the - // heap. + // Per-round size growth itself is clamped to round 10 (Math.min(round, 10) below): rounds + // past 10 exist only to give pollWatchedTargets() more retries against the lock-contention + // race described below, not to keep building the population trend (already eligible by + // round 10) - letting round*600 keep scaling unclamped through round 16 made rounds 11-16 + // each add strictly more retained garbage than the last for no trend benefit, which is what + // drove the "Java heap space" failure this comment's own history refers to. // - // Sized against ObjectSampler::check()'s 256KiB minimum interval, not "memory=64" (which - // only affects LivenessTracker's table capacity). ChainLink's padding keeps the instance - // count - and so the graph the BFS walk must traverse - small. Other klasses (e.g. byte[]) - // may also be flagged, so matching is by ChainLink specifically. + // Instance count is sized against ObjectSampler::check() (objectSampler.cpp), not this + // test's own "memory=64" request: "do not allow shorter interval than 256KiB" means the + // *actual* allocation-sampling interval is 262144 bytes regardless of the small value + // requested above (that request only affects LivenessTracker's own table-capacity formula, + // livenessTracker.cpp's initialize_table()). ChainLink's own padding fields (see that + // class's comment) get enough total megabytes sampled from far fewer instances than plain, + // unpadded ~40-byte instances would need - keeping this test's own contribution to the real + // JVM's root-reachable graph (which ReferenceChainTracker's BFS walk must also traverse, + // Triggering section) from ballooning to the point the walk can't practically catch up + // within this test's own wall-clock budget. ChainLink competes on equal footing against + // other incidental klasses (e.g. "[B"/byte[]) that this same mechanism may also legitimately + // flag as leak candidates - this test's own assertions below look for ChainLink specifically + // among however many datadog.ReferenceChain events actually appear, rather than assuming it + // is the only one. ReferenceChainAssertions.JfrChainMatch match = null; boolean seededTestKlassTrend = false; int totalRounds = 16; for (int round = 1; round <= totalRounds && match == null; round++) { int newInstances = Math.min(round, 10) * 600; List newLinks = new ArrayList<>(newInstances); - allocator.run(() -> { - for (int i = 0; i < newInstances; i++) { - newLinks.add(new ChainLink("leak-" + newInstances + "-" + i)); - } - }); + currentBatch = newLinks; // published before the request - see the allocator's loop + if (!allocRequests.offer(newInstances)) { + throw new IllegalStateException( + "allocRequests queue rejected instance count " + newInstances); + } + roundDone.acquireUninterruptibly(); gcRootHolder.addAll(newLinks); System.gc(); dump(scratchDumpPath); match = ReferenceChainAssertions.findMatchForClass(verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false), ChainLink.class); - if (match == null && ReferenceChainAssertions.isDebugInstrumentedBuild()) { - // Under generations=true, shouldRunPass() gates even the first pass on hasLeakSignal(), - // which this early falls through to selectLeakCandidates()'s hysteresis gate for some - // klass. Seeding SEED_EPOCHS_FOR_HYSTERESIS epochs clears it, authorizing the BFS - // thread's next wake to run the root-seeded walk. The poll below is therefore - // best-effort: it only reconstructs once the representative's getTag() > 0, so the - // retries give the background thread's own post-pass pollWatchedTargets() time to run. + if (match == null && "debug".equals(System.getProperty("ddprof_test.config"))) { + // Debug-only native seams - a no-op in release builds, so this leaves release-build + // coverage of the organic path below completely unchanged. // - // Seed exactly once: recordKlassPopulationSampleLocked() always appends a ring slot, so - // reseeding would turn the ramp into a sawtooth and destroy the positive slope. + // Seeding a klass_id's population ring here is not just a ranking shortcut for an + // object some other pass has already tagged - with generations=true, + // ReferenceChainTracker::shouldRunPass() (referenceChains.cpp) gates even this search's + // very first pass on LivenessTracker::hasLeakSignal(), which (once secondsToOOM() has + // nothing to report yet, this early) falls through to selectLeakCandidates() requiring + // consecutive_positive >= LEAK_TREND_HYSTERESIS_BASE for *some* klass, real or not (see + // SEED_EPOCHS_FOR_HYSTERESIS's own comment for why 10 seeded epochs alone cannot clear + // that bar). Seeding SEED_EPOCHS_FOR_HYSTERESIS epochs for this test-chosen id clears it + // outright, which is what actually authorizes the background BFS thread's next + // scheduled wake to run its real, root-seeded runPass() walk - nothing before that point + // has tagged gcRootHolder's own ChainLink yet. pollReferenceChainTargets0() right below + // is therefore best-effort, not guaranteed on this call: it only reconstructs a chain + // once getTag() on the representative is actually > 0 (pollWatchedTargets()'s only + // precondition), which needs that background pass to have already run. The retry loop + // below (a 300ms-sleep-then-dump fallback, repeated across rounds) gives the + // now-unblocked background thread room to do that and have its own post-pass + // pollWatchedTargets() call (threadLoop(), referenceChains.cpp) pick the chain up on its + // own, independent of this method's own poll call succeeding on the first try. // - // Representative before seeding: setting it aliases the synthetic id to the - // representative's real klass id, so the seeds land in the real population entry - // (seeds under a bare synthetic id satisfy only hasLeakSignal()'s candidate count). - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(CHAIN_LINK_TEST_KLASS_ID, gcRootHolder.get(0)); + // Seed exactly once (recordKlassPopulationSampleLocked(), livenessTracker.cpp, always + // *appends* a fresh ring slot rather than overwriting one for a repeated epoch - calling + // this whole block again on a later round would append a second ramp right after the + // first, turning the ring into a non-monotonic sawtooth and destroying the very + // positive-slope signal selectLeakCandidates() needs). Only the poll+dump recheck below + // needs to repeat across rounds - not the seeding - to give the background pass, or a + // lock-contended dump(), more rounds to resolve. + // Representative BEFORE seeding: setKlassPopulationRepresentativeForTest0 + // resolves the representative's real klass id and aliases the synthetic + // id to it, so the hysteresis seeds below land in the real population + // entry (candidate matching is real-id keyed since the leak-tag pool + // redesign; seeds under a bare synthetic id authorize only + // hasLeakSignal()'s candidate-count check and match nothing else). + JavaProfiler.setKlassPopulationRepresentativeForTest0(CHAIN_LINK_TEST_KLASS_ID, gcRootHolder.get(0)); if (!seededTestKlassTrend) { - // The allocator thread owns every ChainLink allocation, so its tid is the qualifying - // one; the seeds accelerate the organic per-tid growth it produces every round. - int leakTid = allocator.tid(); - // Seed counts match the organic ramp (+1 per epoch): hasQualifyingGrowth() compares - // third-window means over seeds followed by real folds, and inflated seeds (epoch*10) - // made the slope go negative (-20..-40 observed) once real samples displaced them. - // With matched scale ([1..15, 1, 2, 3, ...]) every window pairing stays positive. + // Per-(klass, tid) qualification seeds - the persistent allocator + // thread owns every ChainLink allocation, so ITS tid is the + // qualifying one; the seeds accelerate the organic per-tid growth + // its own tracked instances produce every round (see the + // allocator block's own comment for why qualification aging out + // stranded the crawl before this thread existed). + int leakTid = (int) allocatorTid.get(); + // Seed counts scale as the organic ramp itself (+1 per epoch), + // NOT some inflated multiple: the ring is one continuous series + // of seeds followed by the real folds, and hasQualifyingGrowth() + // takes the difference of third-window MEANS over that whole + // series. Seeds of epoch*10 (10..150) dwarf the real generation + // counts (the real ramp is +1 per epoch, ~1..15 by test end), so + // the moment real samples displace the seeded tail the slope + // went NEGATIVE (-20..-40 observed live: the "transition cliff") + // and the candidate never returned again. With matched-scale + // seeds the series is [1..15, 1, 2, 3, ...] and every third- + // window pairing across the transition still yields a positive + // slope - the candidate keeps qualifying organically the whole + // run, the real signal seamlessly taking over from the seeds. for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0(CHAIN_LINK_TEST_KLASS_ID, epoch, epoch); - ReferenceChainTestHooks.seedTidTrendSample0(CHAIN_LINK_TEST_KLASS_ID, leakTid, epoch, epoch); + JavaProfiler.seedKlassPopulationSample0(CHAIN_LINK_TEST_KLASS_ID, epoch, epoch); + JavaProfiler.seedTidTrendSample0(CHAIN_LINK_TEST_KLASS_ID, leakTid, epoch, epoch); } seededTestKlassTrend = true; } - ReferenceChainTestHooks.pollReferenceChainTargets0(); + JavaProfiler.pollReferenceChainTargets0(); dump(scratchDumpPath); match = ReferenceChainAssertions.findMatchForClass(verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false), ChainLink.class); } if (match == null) { - // A quiet window with no dump() in flight: Profiler::dump() holds every _locks[] entry - // exclusively during _jfr.dump() (rotateDictsAndRun()'s lockAll()/unlockAll()), and - // writeReferenceChain() needs a slot to record anything, so back-to-back dumps leave - // pollWatchedTargets() no window. No gc() before this dump, so cleanup_table()'s - // epoch-advance stays a no-op and the trend is undisturbed. + // A quiet window with no dump() in flight: Profiler::dump() (profiler.cpp) holds every + // entry of _locks[] exclusively for the duration of its own _jfr.dump() call + // (rotateDictsAndRun()'s lockAll()/unlockAll() pair) - the same array + // Profiler::writeReferenceChain() (profiler.cpp) needs a slot from to record an event at + // all. Back-to-back rounds with essentially no gap between one dump() and the next leave + // pollWatchedTargets() (referenceChains.cpp) little to no window to ever win that race; + // sleeping briefly here, then dumping again with no intervening dump()/gc() in between + // (so cleanup_table()'s epoch-advance pass, livenessTracker.cpp, stays a no-op and the + // population trend built up so far is undisturbed), gives it one. Thread.sleep(300); dump(scratchDumpPath); match = ReferenceChainAssertions.findMatchForClass(verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false), ChainLink.class); } } - // Grace period: the trend only became eligible partway through the loop, and the same lock - // contention can delay the write past the last dump(). + // Grace period: the population trend only became eligible (ring_fill >= 10) partway through + // the loop above, and the same lock contention the loop's own comment describes can still + // delay the resulting write past this method's very last dump() - retry a few more times, + // well past that contention window, before concluding the mechanism genuinely did not fire. for (int attempt = 0; match == null && attempt < 5; attempt++) { Thread.sleep(1000); dump(scratchDumpPath); @@ -307,60 +555,118 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { "Never observed a datadog.ReferenceChain event whose chain[0] is " + ChainLink.class + " after " + gcRootHolder.size() + " retained ChainLink instances across up to " + totalRounds + " population-growth rounds plus a grace period"); - // chain[0] is the target's own class, not its holder's: reconstructChain() appends each - // entry's referrer_klass leaf-to-root, and referrer_klass is the discovered object's own - // class (see referenceChainJfrRoundtrip_ut.cpp). Hops above chain[0] are JDK collection - // internals this test does not control, so they are not asserted. + // chain[0] is the *target* object's own class, not its holder's: + // ReferenceChainTracker::buildChainEvent()'s reconstructChain() (referenceChains.h) + // appends each visited FrontierEntry's referrer_klass leaf-to-root, and referrer_klass is + // populated from the *discovered object's own* GetClassSignature at insertion time (see + // referenceChainJfrRoundtrip_ut.cpp's insert(tag, parent_tag, referrer_klass, depth) calls, + // where tag 3's own referrer_klass is leafKlass, not middleKlass). The target here is + // always some currently-live ChainLink instance - the only class this test's leak-candidate + // population trend was built from - regardless of exactly which of the many instances + // allocated above LivenessTracker::foldKlassCountsLocked() (livenessTracker.cpp) happened to + // keep as its representative. Everything above chain[0] reflects real JDK-internal + // collection representation (e.g. ArrayList's backing array) rather than anything this test + // controls, so it is deliberately not asserted beyond "at least one hop was reconstructed". assertEquals(ChainLink.class.getName(), match.chain.get(0)); assertTrue(match.targetTag > 0, "targetTag should be a valid, non-zero JVMTI tag"); assertTrue(match.depth >= 0, "depth should be a non-negative hop count"); assertTrue(!gcRootHolder.isEmpty()); // keeps every allocated ChainLink reachable until here } finally { gcRootHolder = null; // shared-JVM hygiene - see the static holder's own comment - allocator.close(); + currentBatch = null; + // Shut the persistent allocator thread down before leaving: this is a + // shared, no-forkEvery test JVM, and a leftover allocation thread would + // keep allocating (and keep its tid trend alive) into every later test. + allocator.interrupt(); + allocator.join(1000); Files.deleteIfExists(scratchDumpPath); } } /** - * Same target-selection mechanism as {@link #shouldReconstructReferrerChainToGcRoot()}, against - * a common real-world leak shape: an ever-growing, never-evicted {@link java.util.HashMap} cache - * of {@link CachedPayload} values. Also asserts the chain threads through HashMap's internal - * storage, proving the walk handles real JDK collection internals. + * A second, independent end-to-end scenario for the same target-selection mechanism as + * {@link #shouldReconstructReferrerChainToGcRoot()}, using a shape much closer to a real-world + * leak than that method's hand-rolled {@link ChainLink} list: an ever-growing, never-evicted + * {@link java.util.HashMap}-backed cache - a very common real leak pattern - holding + * {@link CachedPayload} values. Beyond confirming a chain fires for the leaking value type, + * this also asserts the reconstructed chain actually threads back through + * {@code java.util.HashMap}'s own internal storage ({@code HashMap$Node}), i.e. that the + * mechanism correctly walks a real JDK collection's internals rather than only ever having + * been proven against a single purpose-built linked fixture. + * + *

    Why {@code cache} is a local variable, not a {@code static} field (found the hard + * way): {@code ReferenceChainTracker::expandFrontier()} (referenceChains.cpp) freezes + * whatever children it observes for a node the moment that node is expanded - it never + * re-examines an already-{@code EXPANDED} entry for newly-added children, regardless of how + * many times root/stack-ref enumeration itself reruns over the search's lifetime + * ({@code runPassManualWalk()}'s own comment). A {@code static} field becomes a root at + * class-load time, essentially guaranteeing some early pass catches it (and marks it + * {@code EXPANDED}) while still empty - permanently blocking discovery of anything added to it + * afterward, no matter how many rounds run. A local variable created fresh at the top of this + * method, immediately followed by round-1 allocation, gives root enumeration a real chance to + * catch it only after it already holds live data - mirroring + * {@link #shouldReconstructReferrerChainToGcRoot()}'s {@code gcRootHolder}, which works for + * exactly this reason (a local {@code ArrayList}, not a {@code static} one). * - *

    Why {@code cache} is a local variable, not a {@code static} field: - * {@code expandFrontier()} freezes a node's children when it is expanded and never re-examines - * it. A {@code static} field is a root from class-load time, so an early pass would almost - * certainly expand it while still empty and block discovery of everything added later. + *

    See this class's own header comment for why this runs as {@code @Order(2)}, before + * {@link #shouldReportAbandonedSearchOnTinyFrontierCap()}, and for why its relative order + * against {@link #shouldReconstructReferrerChainToGcRoot()} does not itself matter. */ @Test @Order(2) public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exception { - // Seed one entry before the resets, for the same empty-sentinel/frozen-children reason as - // gcRootHolder's seeding: HashMap's table is only allocated on the first put(). + // Seed cache with one live entry *before* the resets below, mirroring + // shouldReconstructReferrerChainToGcRoot()'s own gcRootHolder seeding (see that method's + // comment): HashMap's backing table also starts out as a shared, lazily-replaced empty + // sentinel (only allocated on the first put()), so the same one-shot-BFS-freeze hazard + // documented there - a concurrent GC-triggered walk expanding this node's children while the + // backing table is still the empty sentinel, permanently freezing an empty children set - + // applies here too. Seeding one entry first means the backing table is never empty at any + // point after the search (re)starts. Map cache = new HashMap<>(); cache.put("cache-leak-seed", new CachedPayload("cache-leak-seed")); - if (ReferenceChainAssertions.isDebugInstrumentedBuild()) { - // The natural restart after the @Order(1) search ends is gated on canAffordNewSearch() and - // not guaranteed within this method's retry budget, so force a fresh search. The population - // reset is also needed: resetReferenceChainSearchForTest0() leaves LivenessTracker's rings - // alone, and ChainLink's leftover positive slope could outrank CachedPayload. - // Debug-only: these native seams do not exist in a release build. - ReferenceChainTestHooks.resetKlassPopulationForTest0(); - ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); + if ("debug".equals(System.getProperty("ddprof_test.config"))) { + // Mirrors shouldReconstructReferrerChainToGcRoot()'s own reset (see that method's comment): + // the natural restartSearch() cycle (shouldRunPass(), referenceChains.cpp) that would + // otherwise give this method its own fresh root walk once shouldReconstructReferrerChainToGcRoot()'s + // own ChainLink candidate is found and its tags released is gated on cadence/pacing budget + // (canAffordNewSearch()) - not guaranteed to fire again before this method's own round/retry + // budget runs out. Force a genuine fresh search here too, rather than depend on that timing, + // so cache (below) is guaranteed reachable by a real walk regardless of it. Debug-only: this + // native seam does not exist in a release build. + // + // resetReferenceChainSearchForTest0() only resets ReferenceChainTracker's own search state + // (frontier/tags/search-progress fields); it does not touch LivenessTracker's per-klass + // population-history rings, which selectLeakCandidates() consults independently to decide + // which klass is "trending". Without also resetting those, a klass ChainLink already + // accumulated a positive slope for during shouldReconstructReferrerChainToGcRoot() can still + // outrank CachedPayload as the leak candidate here, so the fresh search below ends up + // reconstructing ChainLink's chain again instead of CachedPayload's. + JavaProfiler.resetKlassPopulationForTest0(); + JavaProfiler.resetReferenceChainSearchForTest0(); } - // Every CachedPayload is allocated by one persistent thread - see PersistentAllocator. - PersistentAllocator allocator = new PersistentAllocator("cache-leak-allocator"); Path scratchDumpPath = Paths.get("referencechains-cache-leak-scratch.jfr"); try { - // Same round-growth/retry shape (and caps) as shouldReconstructReferrerChainToGcRoot(). + // Same round-growth/retry shape as shouldReconstructReferrerChainToGcRoot() - see that + // method's own comment for why the loop self-adjusts rather than committing to a fixed + // round count, why per-round scale is sized against ObjectSampler's real 256KiB sampling + // floor rather than this test's own "memory=64" request, why totalRounds is capped at + // 16 rather than a larger margin above the 10-round minimum (shared-fork heap headroom), + // and why per-round growth itself is clamped to round 10 (Math.min(round, 10) below). ReferenceChainAssertions.JfrChainMatch match = null; boolean seededTestKlassTrend = false; int totalRounds = 16; - // Keys are pre-generated: a String key (and its byte[]) allocated alongside each - // CachedPayload would compete for the size-weighted sampler. Allocating them all up front - // lets their own population trend flatten before CachedPayload's starts growing. + // Pre-generate every key this loop will ever need, up front, rather than concatenating a + // fresh String on every put() below. CachedPayload's own class comment already documents + // why this fixture uses plain long fields instead of a byte[] (an earlier version's byte[] + // field stole every allocation-sampling hit from CachedPayload itself) - the key String + // (plus its own backing byte[]) is the same kind of same-instant, size-weighted-sampler + // competitor, just a *separate* object instead of a field. Generating all keys in one + // batch before the round loop starts lets their own klass_population trend flatten out + // (selectLeakCandidates() needs KLASS_POPULATION_MIN_FILL_FOR_TREND=10 *new* samples, not + // just a nonzero ring) well before CachedPayload's own ring starts growing, so the sampler + // has nothing else in flight to compete with once round 1 begins. int maxEntries = 0; for (int round = 1; round <= totalRounds; round++) { maxEntries += Math.min(round, 10) * 600; @@ -372,38 +678,52 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc int nextKey = 0; for (int round = 1; round <= totalRounds && match == null; round++) { - // Same *600 rate as the ChainLink test: the two classes are near-identical in size, and a - // lower rate let CachedPayload's ring stall short of KLASS_POPULATION_MIN_FILL_FOR_TREND. + // Matches shouldReconstructReferrerChainToGcRoot()'s own *600 growth rate (not *300, this + // method's previous value) - CachedPayload and ChainLink are near-identical in size (same + // padding fields; CachedPayload is actually slightly smaller, missing ChainLink's `next` + // reference), so halving the growth rate here bought no headroom and instead just let + // CachedPayload's own population ring stall short of KLASS_POPULATION_MIN_FILL_FOR_TREND + // within the same totalRounds budget both methods share. int newEntries = Math.min(round, 10) * 600; int keyOffset = nextKey; - allocator.run(() -> { + Thread allocator = new Thread(() -> { for (int i = 0; i < newEntries; i++) { String key = keys[keyOffset + i]; cache.put(key, new CachedPayload(key)); } }); + allocator.start(); + allocator.join(); nextKey += newEntries; System.gc(); dump(scratchDumpPath); JfrEvents events1 = verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false); match = ReferenceChainAssertions.findMatchForClass(events1, CachedPayload.class); - if (match == null && ReferenceChainAssertions.isDebugInstrumentedBuild()) { - // Same seed-once, representative-first, best-effort-poll rationale as - // shouldReconstructReferrerChainToGcRoot(). - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(CACHED_PAYLOAD_TEST_KLASS_ID, cache.get(keys[0])); + if (match == null && "debug".equals(System.getProperty("ddprof_test.config"))) { + // Same deterministic short-circuit as shouldReconstructReferrerChainToGcRoot() - see + // that method's own comment for the full mechanism (why seeding + // SEED_EPOCHS_FOR_HYSTERESIS epochs is what actually authorizes the background BFS + // thread's next real pass, and why this method's own pollReferenceChainTargets0() call + // right below is therefore best-effort rather than something the seed alone + // guarantees on this call). Seed exactly once - see that method's own comment for why + // reseeding the same ramp on a later round would corrupt the ring into a non-monotonic + // sawtooth and destroy the positive-slope signal instead of just re-establishing it. + // Representative BEFORE seeding - same real-id aliasing rationale as + // shouldReconstructReferrerChainToGcRoot()'s own comment above. + JavaProfiler.setKlassPopulationRepresentativeForTest0(CACHED_PAYLOAD_TEST_KLASS_ID, cache.get(keys[0])); if (!seededTestKlassTrend) { - // The allocator thread owns every CachedPayload allocation, and the seeds use the - // organic ramp's scale - both for the reasons shouldReconstructReferrerChainToGcRoot() - // gives. - int leakTid = allocator.tid(); + // Per-(klass, tid) qualification seeds - see LeakingCacheScenario's + // own seeding block for why this thread's tid (the representative's + // creator) is the qualifying one for the one-cohort-per-round shape. + int leakTid = JavaProfiler.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0(CACHED_PAYLOAD_TEST_KLASS_ID, epoch, epoch); - ReferenceChainTestHooks.seedTidTrendSample0(CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch, epoch); + JavaProfiler.seedKlassPopulationSample0(CACHED_PAYLOAD_TEST_KLASS_ID, epoch * 10, epoch); + JavaProfiler.seedTidTrendSample0(CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch * 3, epoch); } seededTestKlassTrend = true; } - ReferenceChainTestHooks.pollReferenceChainTargets0(); + JavaProfiler.pollReferenceChainTargets0(); dump(scratchDumpPath); JfrEvents events2 = verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false); match = ReferenceChainAssertions.findMatchForClass(events2, CachedPayload.class); @@ -450,43 +770,98 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc + "storage (cache is a HashMap) - chain was: " + match.chain); assertTrue(!cache.isEmpty()); // keeps every cached CachedPayload reachable until here } finally { - allocator.close(); Files.deleteIfExists(scratchDumpPath); } } /** - * Drives the shared search to {@code SearchState::ABANDONED} - via {@code framecap=1} when this - * method sizes the {@code FrontierTable}, otherwise via the {@code ttl=100} fallback (see - * {@code getProfilerCommand()}) - and asserts a {@code datadog.ReferenceChainAbandoned} event is - * written on {@code dump()}, without asserting which reason produced it. + * This test's stated abandonment-path scenario: an artificially tiny frontier cap + * ({@code getProfilerCommand()}'s {@code framecap=1} for this test method, see that method's own + * comment for why {@code budget} must stay larger than {@code framecap}) makes the very first + * BFS pass hit the frontier cap once a second root-referenced object is discovered, so + * {@code runPass()} (referenceChains.cpp) abandons the search rather than silently truncating it + * - or, if this method's own + * {@code framecap=1} lost the race to size the shared {@code FrontierTable} (see + * {@code getProfilerCommand()}'s own comment on this method), its {@code ttl=100} fallback + * abandons the search instead once enough wall-clock time has passed, which by the time this + * method runs it always has. Either path exercises the same {@code buildAbandonedEvent()} / + * {@code Profiler::writeReferenceChainAbandoned()} / {@code FlightRecorder::recordReferenceChainAbandoned()} + * write into the recording that {@code Profiler::dump()} triggers - this method only asserts that + * a {@code datadog.ReferenceChainAbandoned} event exists, not which reason produced it. * - *

    {@code @Order(3)}: abandoning the singleton search would break the two success-path tests. - * The debug-build reset makes the fresh-search precondition explicit: if an earlier test's - * trend never fired, the search may still be {@code RUNNING} with a large frontier. + *

    {@code @Order(3)}: this permanently exhausts the process-wide {@code ReferenceChainTracker} + * singleton's one-and-only search (see this class's header comment), so it must run after + * {@link #shouldReconstructReferrerChainToGcRoot()} and + * {@link #shouldReconstructReferrerChainThroughUnboundedCacheLeak()}. It used to rely on being + * the last method in source order plus JUnit's default (unannotated methods sort after + * {@code @Order}-annotated ones) for that - which happened to guarantee run order, but not the + * search *state* this method's own comment above presumes: if either earlier test's own + * organic GC/allocation-sampling trend never fired in time (observed in practice - real + * flakiness, not this test's fault), the shared search can still be {@code RUNNING} with a + * large, non-fresh frontier when this method starts, instead of the small, just-abandoned one + * its own {@code framecap=1}/{@code ttl=100} scenario assumes. Calling + * {@code resetReferenceChainSearchForTest0()} here, exactly as both earlier tests already do for + * their own scenarios, makes this method's own precondition (a fresh search) something it + * establishes itself rather than something it presumes a prior test left behind. Debug-only: + * this native seam does not exist in a release build. * - *

    Why the population seeding: {@code resetReferenceChainSearchForTest0()} alone was - * observed never running a first pass. With this command ({@code memory=64:l:1.0}, no - * {@code generations=true}) {@code LivenessTracker::initialize()} clears generations, so - * {@code hasLeakSignal()} returns true unconditionally; the seeding is defensive in case the - * command re-enables generations, in which case {@code shouldRunPass()} falls through to - * {@code selectLeakCandidates()} with nothing left from the cache test's population reset. No - * representative is set: a qualifying entry counts toward {@code hasLeakSignal()} regardless, - * and {@code resolveCandidateRepresentative()} is null-safe. + *

    Why this method also seeds a klass population trend, despite requesting no + * {@code generations=true} of its own (found the hard way: {@code resetReferenceChainSearchForTest0()} + * alone was not enough - the search's first pass never ran at all, so it could never reach + * {@code SearchState::ABANDONED} for {@code dump()} to observe): {@code LivenessTracker::_gc_generations} + * (livenessTracker.cpp's {@code initialize()}) is only ever updated when a {@code start()} command + * actually requests liveness tracking - a bare {@code referencechains=true:...} command like this + * method's own does not call {@code LivenessTracker::start()} at all, so + * {@code gcGenerationsEnabled()} stays stuck at whatever the two {@code generations=true} tests + * above last left it (confirmed directly: this method's own native trace shows + * {@code gc_generations=1}). {@code ReferenceChainTracker::hasLeakSignal()}, which + * {@code shouldRunPass()} consults for even this search's very first pass, therefore falls + * through to {@code selectLeakCandidates()} exactly as the two tests above do - with nothing + * left over from {@link #shouldReconstructReferrerChainThroughUnboundedCacheLeak()}'s own + * {@code resetKlassPopulationForTest0()} call to satisfy it. Seeding + * {@code SEED_EPOCHS_FOR_HYSTERESIS} epochs for a dedicated klass id (see + * {@code SEED_EPOCHS_FOR_HYSTERESIS}'s own comment for the full derivation) clears that gate the + * same way it does there - this method never sets a representative or polls for it, since it has + * no reconstructed chain of its own to prove; {@code selectLeakCandidates()} + * (livenessTracker.cpp) counts a qualifying entry toward {@code hasLeakSignal()}'s candidate + * count regardless of whether its representative was ever set, and + * {@code resolveCandidateRepresentative()} is null-safe against one that wasn't. * - *

    Why a {@code System.gc()} + throwaway {@code dump()} precede the seeding: - * {@code cleanup_table()} wipes {@code _klass_population} once when the class map's - * generation changes (which this method's fresh {@code start()} causes), but only after the - * {@code if (!is_epoch_owner && !forced) return;} guard, which an unforced dump-triggered call - * passes only when a new GC epoch is pending. Without a GC first, the wipe would be deferred to - * the next forced cleanup (on the BFS thread's wake after the GCs below) and discard the seed. - * The success-path tests get this for free from their round-1 GC + dump. + *

    Why the seeding is preceded by a {@code System.gc()} and a throwaway {@code dump()} + * (found the hard way, twice: a bare {@code dump()} with no preceding GC still lost the + * race): {@code cleanup_table()} (livenessTracker.cpp) compares + * {@code Profiler::classMap()->generation()} against its own cached copy and, on a mismatch - + * which this method's own fresh {@code start()} causes, by clearing that map - wipes + * {@code _klass_population} back to empty before folding anything else, exactly once per + * mismatch; but that comparison sits *after* an early-return guard + * (`{@code if (!is_epoch_owner && !forced) return;}`) that a {@code dump()}-triggered call + * (always {@code forced=false}) only clears when a genuinely new, not-yet-processed GC epoch + * is pending - a {@code dump()} with no GC since the last {@code cleanup_table()} pass never + * reaches the mismatch check at all. The two methods above never hit any of this because their + * own seed loop runs only after their round-1 {@code System.gc()}+{@code dump()} pair has + * already triggered that one-time wipe-and-resync as a side effect of their own allocation + * loop; seeding before any GC/dump of this method's own would instead leave the seed to be + * discarded by the *next* call that does clear the guard - this class's own + * {@code maybeForceCleanup()} tick (called once per {@code ReferenceChainTracker::threadLoop()} + * wake, {@code forced=true} unconditionally clears the guard), which fires on this method's own + * 3 {@code System.gc()} calls below regardless. The explicit {@code System.gc()}+{@code dump()} + * pair here forces that one-time wipe-and-resync to happen now, before seeding, exactly like + * the two methods above get for free from their own round-1 allocation loop. */ @Test @Order(3) public void shouldReportAbandonedSearchOnTinyFrontierCap() throws Exception { - if (ReferenceChainAssertions.isDebugInstrumentedBuild()) { - // GC + throwaway dump before seeding - see javadoc. + if ("debug".equals(System.getProperty("ddprof_test.config"))) { + // See this method's own javadoc ("Why this method also seeds a klass population trend...") + // for why this is needed even though this method requests no generations=true of its own. + // + // A System.gc() + throwaway dump() first - see this method's own javadoc ("Why the seeding + // is preceded by...") for why *both* are needed: a dump() alone triggers cleanup_table() + // with forced=false, which only clears the class-map-generation-mismatch guard (and + // therefore only wipes/resyncs _klass_population) when a new GC epoch is actually pending - + // this System.gc() is what makes that true for this call, rather than leaving it to chance + // (or to this method's own 3 System.gc() calls below, which run after the seed and would + // let maybeForceCleanup()'s forced=true tick discard it first). System.gc(); Path warmupDumpPath = Paths.get("referencechains-abandoned-test-warmup.jfr"); try { @@ -494,14 +869,17 @@ public void shouldReportAbandonedSearchOnTinyFrontierCap() throws Exception { } finally { Files.deleteIfExists(warmupDumpPath); } - ReferenceChainTestHooks.resetKlassPopulationForTest0(); - // Gate-only seeding: no tagged instance needs to match, so any tid would do. - int abandonTid = ReferenceChainTestHooks.getTid(); + JavaProfiler.resetKlassPopulationForTest0(); + // Per-(klass, tid) qualification seeds - gate-only usage (this test + // drives the search to ABANDONED and asserts on the abandon marker, no + // tagged instance needs to match), so the tid is this thread's real one + // but any distinct tid would do. + int abandonTid = JavaProfiler.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0(ABANDON_TEST_KLASS_ID, epoch * 10, epoch); - ReferenceChainTestHooks.seedTidTrendSample0(ABANDON_TEST_KLASS_ID, abandonTid, epoch * 3, epoch); + JavaProfiler.seedKlassPopulationSample0(ABANDON_TEST_KLASS_ID, epoch * 10, epoch); + JavaProfiler.seedTidTrendSample0(ABANDON_TEST_KLASS_ID, abandonTid, epoch * 3, epoch); } - ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); + JavaProfiler.resetReferenceChainSearchForTest0(); } List gcRootHolder = new ArrayList<>(); gcRootHolder.add(new ChainLink("middle", new ChainLink("leaf"))); @@ -520,9 +898,17 @@ public void shouldReportAbandonedSearchOnTinyFrontierCap() throws Exception { Path dumpPath = Paths.get("referencechains-abandoned-test.jfr"); try { - // The pass still has to be woken and reach the frontier-cap/ttl cutoff within whatever time - // the shared JVM grants it; a single fixed sleep-then-assert failed when it landed a beat - // early. Retry spaced far enough apart to tolerate a slow wake or a larger inherited heap. + // Even with the seeding above clearing hasLeakSignal()'s gate so the search's first pass is + // actually allowed to start (this method's own javadoc), that pass still has to be woken by + // the BFS thread and still has to actually reach the frontier cap/ttl cutoff, inside whatever + // real wall-clock time this shared, no-forkEvery test JVM's own scheduling happens to grant + // it (this class's own header comment) - a single fixed-length sleep-then-dump-then-assert, + // with no room to retry, previously failed outright whenever that one attempt landed a beat + // early. Retry across a few more dumps, spaced far enough apart to tolerate a slow + // BFS-thread wake or a walk over a larger-than-usual inherited heap, before concluding the + // search genuinely never abandoned - mirroring the bounded retry loops + // shouldReconstructReferrerChainToGcRoot()/shouldReconstructReferrerChainThroughUnboundedCacheLeak() + // already use above. JfrEvents abandoned = null; for (int attempt = 0; attempt < 8; attempt++) { dump(dumpPath); @@ -542,9 +928,15 @@ public void shouldReportAbandonedSearchOnTinyFrontierCap() throws Exception { } /** - * Referrer-type fixture for the success-path and abandonment-path tests. The 32 {@code long} - * fields cut the instance count needed per sampled megabyte. Plain fields, not an array: an - * array would be a separate allocation competing for the size-weighted sampler. + * Referrer-type fixture shared by both the success-path and abandonment-path tests. The 32 + * {@code long} fields below exist purely so {@link #shouldReconstructReferrerChainToGcRoot()} + * needs far fewer instances to allocate a given number of megabytes of ChainLink - deliberately + * plain fields, not a nested array: an array field would be a *second*, separate heap + * allocation, and the allocation-sampling interval that method's comment describes picks + * whichever allocation happens to cross its byte threshold size-weighted, so a same-instance + * companion array would take sampling attention away from ChainLink itself rather than adding + * to it. Plays no role in {@link #shouldReportAbandonedSearchOnTinyFrontierCap()}'s tiny, + * two-object fixture beyond trivially increasing its size. */ private static final class ChainLink { final String name; @@ -563,9 +955,17 @@ private static final class ChainLink { } /** - * Cache-value fixture for {@link #shouldReconstructReferrerChainThroughUnboundedCacheLeak()}. - * Padded with plain {@code long} fields for the same reason as {@link ChainLink}; a - * {@code byte[]} field was observed taking every sample away from {@code CachedPayload}. + * Realistic-leak fixture for {@link #shouldReconstructReferrerChainThroughUnboundedCacheLeak()}: + * models the single most common real-world leak shape this mechanism is meant to catch - an + * unbounded, never-evicted cache - as opposed to {@link ChainLink}'s hand-rolled linked list. + * The 32 {@code long} fields exist purely so a given number of megabytes needs far fewer + * entries to reach {@code ObjectSampler}'s real 256KiB sampling floor - deliberately plain + * fields, not a nested array, for exactly the reason {@link ChainLink}'s own comment already + * documents: a same-instance companion array would be a *second*, separate heap allocation + * that the size-weighted allocation sampler would compete for, taking sampling attention away + * from {@code CachedPayload} itself (an earlier version of this fixture used a {@code byte[]} + * field and never observed a single {@code CachedPayload} sample as a result - the sampler was + * catching the array instead). */ private static final class CachedPayload { final String key; diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java index 5f5e3f2fb6..a1251f5fed 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java @@ -6,20 +6,16 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.JavaProfiler; -import com.datadoghq.profiler.ReferenceChainTestHooks; import org.openjdk.jmc.common.item.IItemCollection; import org.openjdk.jmc.common.item.ItemFilters; import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit; import java.io.InputStream; -import java.lang.reflect.Field; import java.nio.file.Files; import java.nio.file.Path; import java.util.ArrayList; -import java.util.Arrays; import java.util.Collections; import java.util.List; -import java.util.concurrent.TimeUnit; /** * Mimics the real leak shape found in the {@code prof-analyzer-hotdog-jb} pod's leak generator @@ -44,12 +40,9 @@ private StaticFieldGrowingCollectionScenario() {} /** * Mirrors production's {@code ProfileAnalyzer.LEAK_BUFFER}: a static field holding a * {@code synchronizedList}, appended to (never reassigned) for the process's whole - * life. The backing ArrayList is pre-sized so it never reallocates during the scenario: the - * elementData array checked as EXPANDED before lateChunk is appended is the very array that ends - * up holding lateChunk. + * life. */ - static final List LEAK_BUFFER = - Collections.synchronizedList(new ArrayList<>(StaticFieldGrowingCollectionScenario.LEAK_BUFFER_CAPACITY)); + static final List LEAK_BUFFER = Collections.synchronizedList(new ArrayList<>()); // Arbitrary, scenario-chosen klass id - see LeakingCacheScenario.CACHED_PAYLOAD_TEST_KLASS_ID's // own comment; distinct from that scenario's id since both may run in the same suite (each in @@ -68,36 +61,9 @@ private StaticFieldGrowingCollectionScenario() {} private static final int SEED_CHUNKS = 10; - private static final int TOTAL_ROUNDS = 25; - - // Each tail rotation appends a chunk to LEAK_BUFFER, so LEAK_BUFFER_CAPACITY covers these too. - private static final int TAIL_ATTEMPTS = 40; - - // Consecutive tail attempts the same chunk stays the watched target before rotating - see the - // tail loop. - private static final int TAIL_CHUNK_ATTEMPTS = 8; - - // Seeds + lateChunk + one per round + one per tail attempt (worst case), so LEAK_BUFFER's - // elementData never reallocates. - private static final int LEAK_BUFFER_CAPACITY = - SEED_CHUNKS + 1 + TOTAL_ROUNDS + TAIL_ATTEMPTS; - - // FrontierEntryState::EXPANDED (referenceChainFrontier.h), as reported by - // ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(). - private static final int FRONTIER_STATE_EXPANDED = 1; - - // ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0()'s "no frontier entry" sentinel. - private static final int FRONTIER_STATE_NONE = -1; - /** Printed to stdout, followed by the matched leaf class's name, on success. */ public static final String FOUND_MARKER = "[chain-found] "; - /** - * Printed to stdout, followed by {@code true}/{@code false}, once the scenario has decided - * whether it takes the native test-seam path (every -DDEBUG build: debug/asan/tsan). - */ - public static final String SEAM_PATH_MARKER = "[seam-path] "; - /** Printed to stdout (with no class name suffix) if no match was ever observed. */ public static final String NOT_FOUND_MARKER = "[chain-not-found]"; @@ -105,7 +71,7 @@ private StaticFieldGrowingCollectionScenario() {} * Seeds {@link #LEAK_BUFFER}, starts the profiler, then keeps appending new {@code byte[]} * chunks to the same list instance - the exact shape implicated in the live hotdog-pod stall - * watching specifically for a chain to a chunk appended *after* the static field's one-time - * sweep, until a {@code datadog.ReferenceChain} event for it appears or {@code TOTAL_ROUNDS} is + * sweep, until a {@code datadog.ReferenceChain} event for it appears or {@code totalRounds} is * exhausted. */ public static void run(JavaProfiler profiler, String startCommand, Path scratchDumpPath) throws Exception { @@ -116,140 +82,87 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD profiler.execute(startCommand); } - // The seams used below are compiled into every -DDEBUG native build - debug, asan and tsan - // (javaApi.cpp's #ifdef DEBUG block; ConfigurationPresets.kt) - so the seam path must be - // enabled on all three. Same predicate as LeakTagCorrelationReferenceChainTest's rotation - // gate; release builds get the no-op stubs. - boolean debugBuild = ReferenceChainAssertions.isDebugInstrumentedBuild(); - System.out.println(SEAM_PATH_MARKER + debugBuild); + boolean debugBuild = "debug".equals(System.getProperty("ddprof_test.config")); int hysteresisEpoch = 0; + // Declared at method scope: the per-round maintenance seeding below (in + // its own debugBuild block) reuses this tid. int leakTid = 0; // Snapshotted BEFORE seeding anything, while the BFS thread's search has not run a single // pass yet (referenceChainPassesRunForTest0() reads 0 here) - see the wait loop below for why // this exact value, not just "nonzero", is what the wait needs to advance past. - int initialPasses = debugBuild ? ReferenceChainTestHooks.referenceChainPassesRunForTest0() : -1; + int initialPasses = debugBuild ? JavaProfiler.referenceChainPassesRunForTest0() : -1; if (debugBuild) { - // Pins the frontier-state seam's -1 sentinel: an untagged object (tag 0) has no frontier - // entry. Probed before any seeding - no pass can run until shouldRunPass() sees a leak - // signal - so the BFS root walk cannot have tagged the probe yet. - int untaggedState = ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(new Object()); - if (untaggedState != FRONTIER_STATE_NONE) { - throw new IllegalStateException("frontier-state seam returned " + untaggedState - + " for an untagged probe object, expected " + FRONTIER_STATE_NONE); - } - // Wire a representative for the seeded klass BEFORE the seeds (set-representative-first - // is the load-bearing order: klassPopulationSetRepresentativeForTest() re-keys the - // synthetic entry to the representative's real klass id, and only a representative lets - // the entry mint stable_class_tag). Without a representative topKlassesByGenerationCount() - // skips the entry (no live instance was ever resolved), _watched_leak_klass_count stays - // 0, and runPass() declares the search COMPLETED after every pass - and the terminal - // pass itself then releases every frontier tag (releaseSearchTags()) while - // restartSearch() re-runs the identical walk. The frontier-state seam below blocks on - // _engine_lock mid-pass, so it can only read between passes - where the tags are already - // released - and the EXPANDED wait below can never observe its condition (observed as - // "holders never all reached EXPANDED within 45s" with states [-1, -1, -1]). - // The representative MUST be a byte[] chunk - the leaked klass itself - never the - // list holding it: the representative's real klass becomes the candidate klass, and only - // candidate-klass instances get leak-tagged by tagLeakInstances() and recorded by the - // leak-tag interception path whose chains the seam below reads. A non-byte[] - // representative (e.g. LEAK_BUFFER's own SynchronizedList klass, which has no tracked - // instances in this child JVM) mints no leak tags at all, and lateChunk is never - // discovered (observed as 0/6 runs, the seam returning 0 forever). Watching byte[] does - // flood _leak_parent_fanout with unrelated JVM-wide Object[] parents (~9.5k - // entries/search observed), starving the leak-accumulation rotation prong - but discovery - // does not depend on that prong: the static-anchor descend walk re-walks LEAK_BUFFER's - // whole subtree every search and intercepts every leak-tagged chunk in it (observed - // 10/10 searches), so lateChunk's chain is rebuilt once per search generation regardless. - // The seed chunk is held strongly by the static field, so the tracker's weak - // representative ref stays live. - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(LEAK_BUFFER_TEST_KLASS_ID, - LEAK_BUFFER.get(0)); - // Seed hysteresis-qualifying epochs so hasLeakSignal()/shouldRunPass() authorize the BFS - // thread's first pass. Must precede the passesRun() wait below: a pass only runs once - // shouldRunPass() sees a leak signal, so waiting first deadlocks. Per-(klass, tid) seeds - // (see LeakTagCorrelationScenario): the qualifying tid must be the allocating thread, and - // this thread allocates every LEAK_BUFFER chunk. - leakTid = ReferenceChainTestHooks.getTid(); + // Seed enough hysteresis-qualifying epochs to unlock ReferenceChainTracker::hasLeakSignal()/ + // shouldRunPass() - WITHOUT wiring in a representative object yet (setKlassPopulationRepresentativeForTest0 + // is not called here). hasLeakSignal() only asks selectLeakCandidates() for a nonzero count - + // it never reads/dereferences the representative field - so this step's only job is + // authorizing the BFS thread's first pass to actually start. Doing this BEFORE waiting on + // passesRun() advancing below is load-bearing, found the hard way: a pass only ever runs + // once shouldRunPass() sees a leak signal - waiting on passesRun() before seeding anything is + // a deadlock, not just a slow path. + // Per-(klass, tid) qualification seeds (see LeakTagCorrelationScenario's own + // seeding block for the rationale): the qualifying tid must be the thread that + // allocates the tracked instances - this thread allocates every LEAK_BUFFER + // chunk, including the lateChunk this scenario watches. + leakTid = JavaProfiler.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0(LEAK_BUFFER_TEST_KLASS_ID, epoch * 10, epoch); - ReferenceChainTestHooks.seedTidTrendSample0(LEAK_BUFFER_TEST_KLASS_ID, leakTid, epoch * 3, epoch); + JavaProfiler.seedKlassPopulationSample0(LEAK_BUFFER_TEST_KLASS_ID, epoch * 10, epoch); + JavaProfiler.seedTidTrendSample0(LEAK_BUFFER_TEST_KLASS_ID, leakTid, epoch * 3, epoch); } hysteresisEpoch = SEED_EPOCHS_FOR_HYSTERESIS; } - // Wait until LEAK_BUFFER's holders are ReferenceChainTracker-EXPANDED - strictly before this + // Wait for the BFS thread to fully complete its own first pass - not just + // admitStaticFieldRoots()'s one-time sweep of LEAK_BUFFER's *current* contents (an earlier, + // narrower version of this wait checked exactly that, via a since-removed + // hasCompletedStaticFieldSweepForTest0() seam), but the WHOLE pass, static-field sweep and + // expandFrontier()/collectStaleExpandedEntriesForRotation() alike - strictly before this // scenario creates the one chunk whose chain it is actually going to watch for. This is the // entire point of this scenario: proving that an element appended to a static field's - // collection AFTER that field's List is already EXPANDED gets discovered via a LATER - // re-expansion of that stale entry, not via the very first pass that admitted it. - // Release (non-DEBUG) builds have no frontier-state seam and fall back to a sleep: they never - // pin a specific representative and rely on much-slower real allocation sampling, so the - // margin changes nothing about what the eventual match proves. + // collection AFTER that field's List is already ReferenceChainTracker-EXPANDED gets discovered + // via a LATER re-expansion of that stale entry, not via the very first pass that admitted it. + // Waiting on only the static-field sub-step (found the hard way, by actually instrumenting + // runPassManualWalk() and reading cacheResolvedChain()'s own timestamp against it) is not + // enough: admitStaticFieldRoots() and expandFrontier() are two steps of the SAME runPass() + // call, so Java can observe the former's completion while the latter - which is what actually + // marks LEAK_BUFFER's List entry EXPANDED - is still in flight, still racing lateChunk's + // creation exactly the way the sleep-based version this replaced did. Waiting for + // referenceChainPassesRunForTest0() to advance past its pre-seeding snapshot instead only + // becomes true once that ENTIRE pass (both steps) has finished. Non-debug builds have no such + // seam and fall back to a generous sleep - acceptable there because the non-debug path never + // pins a specific representative anyway (see the debugBuild branch below): it just waits on + // real, much-slower allocation sampling to notice the growth on its own, so a few extra + // seconds of margin either way changes nothing about what the eventual match would prove. if (debugBuild) { - // A changed pass counter alone is not proof that LEAK_BUFFER's holders were expanded: - // truncated passes also bump it, and admitStaticFieldRoots() only processes a bounded - // chunk of classes per call. So the wait synchronizes on the holders' ACTUAL frontier state - // instead: the SynchronizedList, its backing ArrayList and that ArrayList's elementData - // array must all be EXPANDED before lateChunk exists - only then can lateChunk be reached - // exclusively via a later re-expansion. The pass-counter check stays as a precondition - // (and gates the reflective holder reads until the first pass - with its root - // enumeration - has finished). - Field backingListField; - Field elementDataField; - try { - backingListField = - Class.forName("java.util.Collections$SynchronizedList").getDeclaredField("list"); - backingListField.setAccessible(true); - elementDataField = ArrayList.class.getDeclaredField("elementData"); - elementDataField.setAccessible(true); - } catch (ReflectiveOperationException | RuntimeException e) { - throw new IllegalStateException("cannot reach LEAK_BUFFER's backing ArrayList/elementData" - + " - run with --add-opens java.base/java.util=ALL-UNNAMED", e); - } - // admitStaticFieldRoots() sweeps every loaded class - a cold external JVM's full - // JUnit/JMC/Gradle-worker classpath (thousands of classes) can need several retries - // against pause-time-SLO pacing, and the expansion backlog ahead of LEAK_BUFFER's holders - // is FIFO - generous margin for the same reason ExternalProcessReferenceChainTest's own - // budget/pausetarget are raised this far above the in-process test's defaults. Wall-clock - // deadline: the seam reads can contend with a running pass's locks. Not scaled for - // asan/tsan: the parent's 150s launch timeout must still cover this wait + rounds + the 60s - // tail. - long deadline = System.nanoTime() + TimeUnit.SECONDS.toNanos(45); - boolean holdersExpanded = false; - while (!holdersExpanded && System.nanoTime() < deadline) { - holdersExpanded = ReferenceChainTestHooks.referenceChainPassesRunForTest0() != initialPasses - && leakBufferHoldersExpanded(backingListField, elementDataField); - if (!holdersExpanded) { + boolean passCompleted = false; + // admitStaticFieldRoots() sweeps every loaded class in one FollowReferences call - a cold + // external JVM's full JUnit/JMC/Gradle-worker classpath (thousands of classes) can need + // several retries against pause-time-SLO pacing before one completes without truncating (see + // that method's own header comment on retry-from-scratch-but-cheap-on-already-admitted) - + // generous margin for the same reason ExternalProcessReferenceChainTest's own budget/ + // pausetarget are raised this far above the in-process test's defaults. + for (int i = 0; i < 300 && !passCompleted; i++) { + passCompleted = JavaProfiler.referenceChainPassesRunForTest0() != initialPasses; + if (!passCompleted) { Thread.sleep(100); } } - if (!holdersExpanded) { + if (!passCompleted) { throw new IllegalStateException( - "LEAK_BUFFER's holders never all reached EXPANDED within 45s (passesRun=" - + ReferenceChainTestHooks.referenceChainPassesRunForTest0() + ", initial=" + initialPasses - + ", frontier states [list, backing ArrayList, elementData]=" - + describeHolderStates(backingListField, elementDataField) - + ") - cannot safely create the chunk this scenario is supposed to discover only " - + "via a later re-expansion of an already-EXPANDED static-field entry"); + "ReferenceChainTracker never completed its first pass within 30s - cannot safely " + + "create the chunk this scenario is supposed to discover only via a later " + + "re-expansion of an already-EXPANDED static-field entry"); } } else { Thread.sleep(3000); } - // Snapshotted right after the wait above confirms the holders are EXPANDED - any + // Snapshotted right after the wait above confirms the first pass has fully completed - any // later change (advance, or reset-to-lower via a restart) proves a walk that started strictly // after lateChunk existed. - int passesRunBeforeLateChunk = debugBuild ? ReferenceChainTestHooks.referenceChainPassesRunForTest0() : -1; - // lateChunk is deliberately NOT held in a local: the main thread's stack is a root-walk root, - // so a live local lets the root enumeration admit (and, once the canary candidate aliases to - // byte[] and a GC runs tagLeakInstances(), leak-tag) lateChunk directly - the resulting - // stack-local-rooted chain never resolves into the static-field chain this scenario watches, - // and the pre-existing tag blocks the elementData re-walk from admitting lateChunk under the - // stale entry at all (observed as buildChainEvent "target_tag not in frontier" for the whole - // run). Re-fetch the chunk from LEAK_BUFFER on every use instead - the only durable path to - // it is the static field, so its discovery proves the stale-entry re-expansion. - final int LATE_CHUNK_INDEX = SEED_CHUNKS; - LEAK_BUFFER.add(new byte[CHUNK_BYTES]); + int passesRunBeforeLateChunk = debugBuild ? JavaProfiler.referenceChainPassesRunForTest0() : -1; + byte[] lateChunk = new byte[CHUNK_BYTES]; + LEAK_BUFFER.add(lateChunk); // From here on, seeded incrementally, one epoch per round below, rather than as a single // upfront burst - found the hard way: profiler.execute()'s start() resets @@ -261,10 +174,15 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // per round instead is self-healing exactly the way the real leak this scenario mirrors is: // LEAK_BUFFER keeps growing every round regardless of any one-time startup housekeeping, so // however many rounds a wipe costs, the trend simply resumes accumulating from the next - // round's seed call. + // round's seed call. (Waiting for the first pass to fully complete above already makes this + // particular race very unlikely to matter by this point, but there is no reason to give up the + // self-healing margin now that it costs nothing.) ReferenceChainAssertions.ChainMatch match = null; - for (int round = 1; round <= TOTAL_ROUNDS && match == null; round++) { - // Mirrors the real leak's continuous growth; lateChunk stays the watched target. + int totalRounds = 25; + for (int round = 1; round <= totalRounds && match == null; round++) { + // Continues growing LEAK_BUFFER every round after lateChunk - mirrors the real leak's own + // continuous growth - but lateChunk itself (created above, strictly after the first sweep) + // stays the fixed target this scenario watches for throughout. LEAK_BUFFER.add(new byte[CHUNK_BYTES]); System.gc(); @@ -280,17 +198,20 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // legitimately produces a continuous real signal in production; seeding continuously here // is what actually mirrors that, not an artifact to gate away. // - // The representative pins lateChunk, not whatever the real sampler picks. Seeding stays - // uncapped past SEED_EPOCHS_FOR_HYSTERESIS so a wipe costing early rounds still leaves - // enough rounds to requalify. + // Same debug-only seeded-representative short-circuit as LeakingCacheScenario's own - + // watches lateChunk specifically (added after the static field's first sweep), not + // whatever the real allocation sampler happens to pick. See SEED_EPOCHS_FOR_HYSTERESIS's + // own comment for the minimum epoch count this needs - kept uncapped here (not stopped + // once that minimum is reached) specifically so a wipe that costs an early round or two + // still leaves enough remaining rounds to reach it, rather than exhausting a fixed budget + // of calls before ever getting there. hysteresisEpoch++; - ReferenceChainTestHooks.seedKlassPopulationSample0( + JavaProfiler.seedKlassPopulationSample0( LEAK_BUFFER_TEST_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - ReferenceChainTestHooks.seedTidTrendSample0( + JavaProfiler.seedTidTrendSample0( LEAK_BUFFER_TEST_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(LEAK_BUFFER_TEST_KLASS_ID, - LEAK_BUFFER.get(LATE_CHUNK_INDEX)); - ReferenceChainTestHooks.pollReferenceChainTargets0(); + JavaProfiler.setKlassPopulationRepresentativeForTest0(LEAK_BUFFER_TEST_KLASS_ID, lateChunk); + JavaProfiler.pollReferenceChainTargets0(); // Only TRUST a match once passesRun() has genuinely changed since the snapshot taken right // before lateChunk was created - either advanced (the same, never-restarted search ran a @@ -300,82 +221,40 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // one race this whole seam exists to rule out: the very first, still-in-flight pass finding // lateChunk by accident because admitStaticFieldRoots() and expandFrontier() are two steps // of that SAME call, and Java can observe the former's completion before the latter runs. - // - // The match is pinned to lateChunk's OWN chain: any byte[] chain (the seed chunks created - // before the first pass, discovered instances, other representatives) is not enough. The - // tag is read BEFORE dumping - the dump snapshots the same resolved-chain cache - and a - // round where the current search has not resolved lateChunk's chain yet is skipped. - if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() != passesRunBeforeLateChunk) { - long lateChunkTargetTag = ReferenceChainTestHooks.getReferenceChainResolvedTargetTagForTest0( - LEAK_BUFFER.get(LATE_CHUNK_INDEX)); - if (lateChunkTargetTag != 0) { - profiler.dump(scratchDumpPath); - match = findMatch(scratchDumpPath, lateChunkTargetTag); - } + if (JavaProfiler.referenceChainPassesRunForTest0() != passesRunBeforeLateChunk) { + profiler.dump(scratchDumpPath); + match = findMatch(scratchDumpPath); } } - // Release (non-DEBUG) builds have no identity seam: class-only matching, as before. if (match == null && !debugBuild) { profiler.dump(scratchDumpPath); - match = findMatch(scratchDumpPath, 0); + match = findMatch(scratchDumpPath); } if (match == null && !debugBuild) { Thread.sleep(300); profiler.dump(scratchDumpPath); - match = findMatch(scratchDumpPath, 0); + match = findMatch(scratchDumpPath); } } // A cold external JVM's one-shot root-seeded walk over its whole reachable graph (full - // JUnit/JMC/Gradle-worker classpath) takes far longer than the round loop - a 5 x 1s tail - // gave up moments before runPass() completed and built the chain. - int watchedIndex = -1; - int attemptsOnWatchedChunk = 0; - for (int attempt = 0; match == null && attempt < TAIL_ATTEMPTS; attempt++) { + // JUnit/JMC/Gradle-worker classpath) takes far longer than this scenario's own round loop - + // found the hard way: a first attempt at this scenario's tail wait (5 x 1s) gave up and + // printed NOT_FOUND_MARKER mere moments before the tracker's own runPass() actually + // completed (searchState=COMPLETED) and successfully built the chain. Mirrors + // ExternalProcessReferenceChainTest's own comment on why budget/pausetarget are raised this + // far for exactly this reason. + for (int attempt = 0; match == null && attempt < 40; attempt++) { Thread.sleep(1500); - // Same passesRun()-changed guard as the round loop. - long requiredTargetTag = 0; - if (debugBuild) { - if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() == passesRunBeforeLateChunk) { - continue; - } - // The tail watches, one at a time, chunks appended to LEAK_BUFFER well after that - // collection was first EXPANDED - exactly the discovery this scenario exists to prove. - // Watching a chunk allocated once at scenario start (lateChunk above) is not durable: - // the whole leak-tag pipeline keys on the chunk's allocation-tracking record, records - // are only minted at allocation, and the tracking table's churn can evict an old - // chunk's record for the rest of the run - observed as the representative resolving - // that chunk correctly but reading tag=0 for 2000+ consecutive polls (no leak tag ever - // minted, so no interception and no chain ever built for it). A FRESHLY appended chunk - // has a guaranteed-live record: the explicit poll below tags it immediately, the next - // static-anchor descend intercepts it, and a later attempt's poll resolves its chain. - // But discovery takes several walk cycles (interception, then a later poll's chain - // build) - measured at more than one 1.5s attempt - so the SAME chunk must stay the - // watched target for several attempts before rotating to a new one; rotating every - // attempt reads a just-allocated chunk that has not matured yet and abandons each - // chunk right before it would resolve (observed as 0/8 runs). If a chunk still has - // not resolved after TAIL_CHUNK_ATTEMPTS attempts, its record most likely died the - // same death lateChunk's can - rotate. Same no-local discipline as lateChunk above: - // each watched chunk is reachable only through LEAK_BUFFER, so any walk that reaches - // it comes through elementData, never through a stack-local root. - if (watchedIndex < 0 || attemptsOnWatchedChunk >= TAIL_CHUNK_ATTEMPTS) { - LEAK_BUFFER.add(new byte[CHUNK_BYTES]); - watchedIndex = LEAK_BUFFER.size() - 1; - attemptsOnWatchedChunk = 0; - } - attemptsOnWatchedChunk++; - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(LEAK_BUFFER_TEST_KLASS_ID, - LEAK_BUFFER.get(watchedIndex)); - ReferenceChainTestHooks.pollReferenceChainTargets0(); - requiredTargetTag = ReferenceChainTestHooks.getReferenceChainResolvedTargetTagForTest0( - LEAK_BUFFER.get(watchedIndex)); - if (requiredTargetTag == 0) { - continue; - } + // Same passesRun()-advanced check as the round loop above (debug builds only) - by this + // point in a real run it has virtually always already flipped, but there is no reason to + // drop the guarantee here just because the round loop above didn't need it. + if (debugBuild && JavaProfiler.referenceChainPassesRunForTest0() == passesRunBeforeLateChunk) { + continue; } profiler.dump(scratchDumpPath); - match = findMatch(scratchDumpPath, requiredTargetTag); + match = findMatch(scratchDumpPath); } if (match == null) { @@ -385,12 +264,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD System.out.println(FOUND_MARKER + match.chain.get(0).getFullName()); } - /** - * {@code requiredTargetTag == 0}: the first byte[] chain (class-only, non-debug builds). - * Otherwise: only the byte[] chain whose targetTag identifies that one instance. - */ - private static ReferenceChainAssertions.ChainMatch findMatch(Path scratchDumpPath, - long requiredTargetTag) throws Exception { + private static ReferenceChainAssertions.ChainMatch findMatch(Path scratchDumpPath) throws Exception { if (!Files.exists(scratchDumpPath)) { return null; } @@ -398,41 +272,7 @@ private static ReferenceChainAssertions.ChainMatch findMatch(Path scratchDumpPat try (InputStream in = Files.newInputStream(scratchDumpPath)) { events = JfrLoaderToolkit.loadEvents(in); } - IItemCollection chains = events.apply(ItemFilters.type("datadog.ReferenceChain")); - return requiredTargetTag == 0 - ? ReferenceChainAssertions.findMatchForClass(chains, byte[].class) - : ReferenceChainAssertions.findMatchForClassAndTargetTag( - chains, byte[].class, requiredTargetTag); - } - - /** - * Frontier states of LEAK_BUFFER, its backing ArrayList and that list's elementData array. - * The holders are fetched fresh on every call and never kept beyond it - a static field or a - * long-lived local would add a second root path to them. - */ - private static int[] holderStates(Field backingListField, Field elementDataField) - throws IllegalAccessException { - Object backing = backingListField.get(LEAK_BUFFER); - Object elementData = elementDataField.get(backing); - return new int[] { - ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(LEAK_BUFFER), - ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(backing), - ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(elementData) - }; - } - - private static boolean leakBufferHoldersExpanded(Field backingListField, Field elementDataField) - throws IllegalAccessException { - for (int state : holderStates(backingListField, elementDataField)) { - if (state != FRONTIER_STATE_EXPANDED) { - return false; - } - } - return true; - } - - private static String describeHolderStates(Field backingListField, Field elementDataField) - throws IllegalAccessException { - return Arrays.toString(holderStates(backingListField, elementDataField)); + return ReferenceChainAssertions.findMatchForClass( + events.apply(ItemFilters.type("datadog.ReferenceChain")), byte[].class); } } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakReferenceChainTest.java index b0e631a740..f72d4fa1ec 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakReferenceChainTest.java @@ -19,8 +19,6 @@ import java.util.List; import java.util.concurrent.atomic.AtomicReference; -import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_BASE; -import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_POOL_SIZE; import static org.junit.jupiter.api.Assertions.assertEquals; import static org.junit.jupiter.api.Assertions.assertNotNull; import static org.junit.jupiter.api.Assertions.assertTrue; @@ -35,11 +33,19 @@ * {@code ThreadLocal} map must still produce a correlated * {@code datadog.ReferenceChain} - {@code targetTag} in the leak-tag pool * range, matched by a {@code datadog.HeapLiveObject} {@code leakTag}. The - * scenario is {@code ThreadLocalLeakScenario}. + * scenario is {@code ThreadLocalLeakScenario}; this test drives it and + * asserts the reported correlation, with a filtered child-log tail embedded + * in any failure message for diagnosability without a redeploy. */ @Tag("slow") public class ThreadLocalLeakReferenceChainTest extends AbstractProcessProfilerTest { + // Mirrored from referenceChains.h (LEAK_TAG_BASE/LEAK_TAG_POOL_SIZE) - the + // contract under test, asserted against the runtime event values the child + // reports. + private static final long LEAK_TAG_BASE = 0x40000000L; + private static final long LEAK_TAG_POOL_SIZE = 256; + @Test void shouldCorrelateThreadLocalHeldLeakChain() throws Exception { assumeFalse(Platform.isJavaVersion(8)); @@ -61,35 +67,30 @@ void shouldCorrelateThreadLocalHeldLeakChain() throws Exception { String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); List jvmArgs = Collections.singletonList( - "-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); + "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); AtomicReference resultLine = new AtomicReference<>(); LaunchResult result = launch("threadlocal-leak", jvmArgs, packedCommand, Collections.emptyMap(), - childTimeoutSeconds(150), + 150, line -> { if (line.startsWith(ThreadLocalLeakScenario.FOUND_MARKER) || line.equals(ThreadLocalLeakScenario.NOT_FOUND_MARKER) || line.startsWith(ThreadLocalLeakScenario.TAG_OUT_OF_POOL_MARKER) - || line.startsWith(ThreadLocalLeakScenario.NO_LIVE_OBJECT_MARKER) - || line.equals(ThreadLocalLeakScenario.HANDOFF_TIMEOUT_MARKER)) { + || line.startsWith(ThreadLocalLeakScenario.NO_LIVE_OBJECT_MARKER)) { resultLine.set(line); } if (line.startsWith("[TEST::INFO]")) { - // Synchronized: the reader thread can outlive a join timeout. - synchronized (testLogTail) { - testLogTail.addLast(line); - while (testLogTail.size() > 2000) { - testLogTail.removeFirst(); - } + testLogTail.addLast(line); + while (testLogTail.size() > 2000) { + testLogTail.removeFirst(); } } return LineConsumerResult.CONTINUE; }, null); - assertTrue(result.inTime, "Child process did not exit within the wait timeout" - + diagnostics(testLogTail)); + assertTrue(result.inTime, "Child process did not exit within the wait timeout"); assertEquals(0, result.exitCode, "Child process exited with a non-zero code"); assertNotNull(resultLine.get(), "Child process never printed a recognizable result " + "marker on stdout" + diagnostics(testLogTail)); @@ -139,35 +140,30 @@ void shouldCorrelateLeakOnThreadCreatedAfterRecordingStart() throws Exception { String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); List jvmArgs = Collections.singletonList( - "-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); + "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); AtomicReference resultLine = new AtomicReference<>(); LaunchResult result = launch("threadlocal-leak-late", jvmArgs, packedCommand, Collections.emptyMap(), - childTimeoutSeconds(150), + 150, line -> { if (line.startsWith(ThreadLocalLeakScenario.FOUND_MARKER) || line.equals(ThreadLocalLeakScenario.NOT_FOUND_MARKER) || line.startsWith(ThreadLocalLeakScenario.TAG_OUT_OF_POOL_MARKER) - || line.startsWith(ThreadLocalLeakScenario.NO_LIVE_OBJECT_MARKER) - || line.equals(ThreadLocalLeakScenario.HANDOFF_TIMEOUT_MARKER)) { + || line.startsWith(ThreadLocalLeakScenario.NO_LIVE_OBJECT_MARKER)) { resultLine.set(line); } if (line.startsWith("[TEST::INFO]")) { - // Synchronized: the reader thread can outlive a join timeout. - synchronized (testLogTail) { - testLogTail.addLast(line); - while (testLogTail.size() > 2000) { - testLogTail.removeFirst(); - } + testLogTail.addLast(line); + while (testLogTail.size() > 2000) { + testLogTail.removeFirst(); } } return LineConsumerResult.CONTINUE; }, null); - assertTrue(result.inTime, "Child process did not exit within the wait timeout" - + diagnostics(testLogTail)); + assertTrue(result.inTime, "Child process did not exit within the wait timeout"); assertEquals(0, result.exitCode, "Child process exited with a non-zero code"); assertNotNull(resultLine.get(), "Child process never printed a recognizable result " + "marker on stdout" + diagnostics(testLogTail)); @@ -181,12 +177,14 @@ void shouldCorrelateLeakOnThreadCreatedAfterRecordingStart() throws Exception { } } - /** Filtered summary of the child's TEST_LOG stream, embedded in failure messages. */ - private static String diagnostics(Deque testLogTailRef) { - List testLogTail; - synchronized (testLogTailRef) { - testLogTail = new ArrayList<>(testLogTailRef); - } + /** + * A filtered summary of the child's TEST_LOG stream for failure messages - + * same first-things-to-check selection as + * LeakTagCorrelationReferenceChainTest.diagnostics(): the thread-walk and + * pass summaries (the new machinery this scenario exercises), the gotw + * batch-size trace, and any leak-tag interception or correlation lines. + */ + private static String diagnostics(Deque testLogTail) { if (testLogTail.isEmpty()) { return "\n(no TEST_LOG output captured - non-debug build or no reference-chain passes ran)"; } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java index 5f7fb799bf..b0f2e10ee2 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java @@ -6,14 +6,12 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.JavaProfiler; -import com.datadoghq.profiler.ReferenceChainTestHooks; import org.openjdk.jmc.common.IMCType; import org.openjdk.jmc.common.item.IItem; import org.openjdk.jmc.common.item.IItemCollection; import org.openjdk.jmc.common.item.IItemIterable; import org.openjdk.jmc.common.item.IMemberAccessor; import org.openjdk.jmc.common.item.IType; -import org.openjdk.jmc.common.item.ItemFilters; import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit; import java.io.InputStream; @@ -25,9 +23,6 @@ import java.util.concurrent.BlockingQueue; import java.util.concurrent.TimeUnit; -import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_BASE; -import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_POOL_SIZE; - /** * The thread-local taxonomy of the leak-tag correlation use case, run inside a * separate child JVM by {@code ExternalLauncher}'s {@code threadlocal-leak} mode: @@ -57,9 +52,10 @@ public final class ThreadLocalLeakScenario { private ThreadLocalLeakScenario() {} /** - * The leak sink, touched ONLY by the leaking thread. Deliberately NOT - * static-retained: the only durable path to the chunks must run through - * the leaking thread's ThreadLocalMap. + * The leak sink: a per-thread growing list, touched ONLY by the leaking + * thread below. Deliberately NOT static-retained anywhere - the whole + * point is that the only durable path to the chunks runs through the + * leaking thread's ThreadLocalMap. */ private static final ThreadLocal> SINK = ThreadLocal.withInitial(() -> new ArrayList<>()); @@ -85,6 +81,10 @@ private ThreadLocalLeakScenario() {} */ private static final int CHUNK_BYTES = 1_000_000; + // Mirrored from referenceChains.h (LEAK_TAG_BASE/LEAK_TAG_POOL_SIZE). + private static final long LEAK_TAG_BASE = 0x40000000L; + private static final long LEAK_TAG_POOL_SIZE = 256; + /** * Handoff for the leak thread's profiler tid and one seed chunk - the * main thread seeds LivenessTracker's per-(klass, tid) qualification with @@ -108,10 +108,11 @@ byte[] take() { } /** - * Required in both thread-start modes: neither starting the thread - * before {@code profiler.execute()} nor after it guarantees it has - * published by the time run() consumes the handoff. Must be called - * before take() (it polls seedChunk, which take() clears). + * Bounded wait for the leak thread's first publish. Only the + * late-thread mode needs it: there the thread is started after the + * profiler (and thus after {@code profiler.execute()} returned), so the + * main thread cannot rely on the start-command's JNI work having + * scheduled the leak thread far enough to publish. */ boolean awaitPublication(long timeoutMs) throws InterruptedException { long deadline = System.nanoTime() @@ -135,17 +136,9 @@ boolean awaitPublication(long timeoutMs) throws InterruptedException { /** Printed to stdout (with the tag) if no HeapLiveObject matched the chain's tag. */ public static final String NO_LIVE_OBJECT_MARKER = "[tl-correlation-no-live-object] "; - /** - * Printed to stdout if the leak thread never published its tid and seed chunk - a fixture - * failure, reported apart from a correlation miss. - */ - public static final String HANDOFF_TIMEOUT_MARKER = "[tl-correlation-handoff-timeout]"; - private static final class ScanResult { ReferenceChainAssertions.ChainMatch payloadChain; boolean payloadChainInPool; - // ReferenceChain.leakTagIncarnation of payloadChain; -1 when the field is absent. - long payloadChainIncarnation = -1; int liveObjectMatchesForChainTag; } @@ -184,22 +177,17 @@ public static void run(JavaProfiler profiler, String startCommand, // always allocated on the same qualifying tid). BlockingQueue rounds = new ArrayBlockingQueue<>(32); Thread leakThread = new Thread(() -> { - // No local ever holds the sink: re-fetch it via SINK on every use so - // the only durable path to the chunks is Thread.threadLocals -> - // ThreadLocalMap. A live stack local would let root enumeration reach - // ArrayList -> elementData -> byte[] directly (a depth-2 stack-local - // chain the transient-root gate does not suppress), bypassing the - // thread-scoped walk this scenario exists to prove. + List sink = SINK.get(); for (int i = 0; i < SEED_CHUNKS; i++) { - SINK.get().add(new byte[CHUNK_BYTES]); + sink.add(new byte[CHUNK_BYTES]); } - handoff.publish(ReferenceChainTestHooks.getTid(), SINK.get().get(0)); + handoff.publish(JavaProfiler.getTid(), sink.get(0)); while (true) { try { if (rounds.poll(50, TimeUnit.MILLISECONDS) == null) { continue; } - SINK.get().add(new byte[CHUNK_BYTES]); + sink.add(new byte[CHUNK_BYTES]); } catch (InterruptedException e) { return; } @@ -216,43 +204,39 @@ public static void run(JavaProfiler profiler, String startCommand, if (lateThread) { leakThread.start(); - } - if (!handoff.awaitPublication(30000)) { - System.out.println(HANDOFF_TIMEOUT_MARKER); - return; + // The debug seeding below consumes the handoff immediately; the + // thread is only just started, so wait for its first publish. + if (!handoff.awaitPublication(30000)) { + System.out.println(NOT_FOUND_MARKER); + return; + } } - boolean debugBuild = ReferenceChainAssertions.isDebugInstrumentedBuild(); + boolean debugBuild = "debug".equals(System.getProperty("ddprof_test.config")); int leakTid = 0; if (debugBuild) { - // Representative first, seeds second: the rep's real klass id must - // own the seeds or they authorize nothing. take() drops the handoff's - // reference, so the rep chunk stays reachable only via ThreadLocalMap. - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(LEAK_KLASS_ID, handoff.take()); + // Representative first, seeds second - same aliasing rationale as + // LeakTagCorrelationScenario (the rep's real klass id must own the + // seeds or the seeds authorize nothing). The rep chunk stays durably + // reachable only through the leak thread's ThreadLocalMap - the + // take() above dropped this handoff's reference. + JavaProfiler.setKlassPopulationRepresentativeForTest0(LEAK_KLASS_ID, handoff.take()); leakTid = handoff.tid; for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); - ReferenceChainTestHooks.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, epoch * 3, epoch); + JavaProfiler.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); + JavaProfiler.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, epoch * 3, epoch); } - // Maintenance continues the seeded ramp (next epoch = - // SEED_EPOCHS_FOR_HYSTERESIS + 1) instead of restarting at 1 - same as - // StaticFieldGrowingCollectionScenario. - hysteresisEpoch = SEED_EPOCHS_FOR_HYSTERESIS; // Wait for the BFS thread's first full pass, then poll - same // load-bearing wait as LeakTagCorrelationScenario. - int initialPasses = ReferenceChainTestHooks.referenceChainPassesRunForTest0(); + int initialPasses = JavaProfiler.referenceChainPassesRunForTest0(); for (int i = 0; i < 300; i++) { - if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() != initialPasses) { + if (JavaProfiler.referenceChainPassesRunForTest0() != initialPasses) { break; } Thread.sleep(100); } - ReferenceChainTestHooks.pollReferenceChainTargets0(); + JavaProfiler.pollReferenceChainTargets0(); } else { - // Drop the handoff's chunk reference: the lambda (captured by the - // Thread's runnable) retains `handoff`, so a never-taken seedChunk - // would be a second, non-ThreadLocalMap path to a chunk. - handoff.take(); Thread.sleep(5000); } @@ -264,9 +248,9 @@ public static void run(JavaProfiler profiler, String startCommand, } if (debugBuild) { hysteresisEpoch++; - ReferenceChainTestHooks.seedKlassPopulationSample0( + JavaProfiler.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - ReferenceChainTestHooks.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); + JavaProfiler.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); } Thread.sleep(300); System.gc(); @@ -288,9 +272,9 @@ public static void run(JavaProfiler profiler, String startCommand, } if (debugBuild) { hysteresisEpoch++; - ReferenceChainTestHooks.seedKlassPopulationSample0( + JavaProfiler.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - ReferenceChainTestHooks.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); + JavaProfiler.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); } if (!rounds.offer(attempt)) { throw new IllegalStateException( @@ -317,48 +301,23 @@ public static void run(JavaProfiler profiler, String startCommand, System.out.println(FOUND_MARKER + best.payloadChain.targetTag); } - private static boolean passesThroughThreadLocalMap(Object[] rawChain) { - for (Object element : rawChain) { - if (element instanceof IMCType) { - String name = ((IMCType) element).getFullName(); - if (name != null && name.contains("ThreadLocalMap")) { - return true; - } - } - } - return false; - } - private static ScanResult keepBest(ScanResult best, ScanResult scan) { if (scan == null) { return best; } - // Unlike LeakTagCorrelationScenario.keepBest, the losing scan has nothing - // to merge: this scenario's ScanResult carries no transient/noise evidence - // (that is LeakTagCorrelation's contract), and a scan without a payload - // chain has no other populated field worth keeping. If evidence fields are - // ever added here, merge them like LeakTagCorrelationScenario's mergeDistinct. - if (best == null || best.payloadChain == null) { + if (scan.payloadChain != null) { return scan; } - if (scan.payloadChain == null) { - return best; - } - // Mirror scan()'s own within-scan preference: an in-pool (correlated) - // chain outranks an out-of-pool one no matter which scan observed it, so - // a later out-of-pool chain cannot displace an earlier correlated one. - if (best.payloadChainInPool != scan.payloadChainInPool) { - return best.payloadChainInPool ? best : scan; - } - return scan; + return best != null ? best : scan; } /** - * Scans one dump for a leaked {@code byte[]} chain through a ThreadLocalMap - * hop, whether its targetTag is in the leak-tag pool, and how many - * {@code datadog.HeapLiveObject} {@code byte[]} events carry that tag in - * {@code leakTag}. No transient/noise gate scans - those are - * LeakTagCorrelationScenario's contracts. + * Scans one dump: the first leaked {@code byte[]} chain (if any), whether + * its targetTag is in the leak-tag pool, and how many + * {@code datadog.HeapLiveObject} events for a leaked {@code byte[]} carry + * that same tag in {@code leakTag}. Simplified from + * LeakTagCorrelationScenario.scan() - no transient/noise gate scans (those + * are that scenario's own contracts). */ private static ScanResult scan(Path scratchDumpPath) throws Exception { if (!Files.exists(scratchDumpPath)) { @@ -371,15 +330,13 @@ private static ScanResult scan(Path scratchDumpPath) throws Exception { ScanResult result = new ScanResult(); IItemCollection chains = events.apply( - ItemFilters.type("datadog.ReferenceChain")); + org.openjdk.jmc.common.item.ItemFilters.type("datadog.ReferenceChain")); for (IItemIterable iterable : chains) { IType type = iterable.getType(); IMemberAccessor chainAccessor = ReferenceChainAssertions.findAccessor(type, "chain"); IMemberAccessor targetTagAccessor = ReferenceChainAssertions.findAccessor(type, "targetTag"); - IMemberAccessor incarnationAccessor = - ReferenceChainAssertions.findAccessor(type, "leakTagIncarnation"); for (IItem item : iterable) { Object chainValue = chainAccessor.getMember(item); if (!(chainValue instanceof Object[])) { @@ -393,13 +350,6 @@ private static ScanResult scan(Path scratchDumpPath) throws Exception { if (!"byte[]".equals(leaf)) { continue; } - // Only a chain through the leaking thread's ThreadLocalMap proves the - // thread-scoped walk; any other byte[] chain must not satisfy this - // scenario (with thread registration broken it would be the only - // kind of chain left, and the scenario must report NOT_FOUND). - if (!passesThroughThreadLocalMap(rawChain)) { - continue; - } boolean inPool = targetTag >= LEAK_TAG_BASE && targetTag < LEAK_TAG_BASE + LEAK_TAG_POOL_SIZE; // Prefer the first in-pool (correlated) chain over any out-of-pool @@ -412,61 +362,23 @@ private static ScanResult scan(Path scratchDumpPath) throws Exception { } result.payloadChain = new ReferenceChainAssertions.ChainMatch(chain, targetTag, 0); result.payloadChainInPool = inPool; - // The (tag, incarnation) pair is the chain's identity; an unresolved - // -1 stamp must fail loud rather than degrade to tag-only matching, - // which a recycled tag's chunk could satisfy. - if (incarnationAccessor == null) { - throw new IllegalStateException( - "datadog.ReferenceChain events have no leakTagIncarnation accessor"); - } - long chainIncarnation = - ReferenceChainAssertions.numberValue(incarnationAccessor.getMember(item)); - if (chainIncarnation == -1) { - throw new IllegalStateException( - "chain leakTagIncarnation is not a numeric value; " - + "tag-only correlation is ambiguous across recycled tags"); - } - result.payloadChainIncarnation = chainIncarnation; } } } if (result.payloadChainInPool) { IItemCollection liveObjects = events.apply( - ItemFilters.type("datadog.HeapLiveObject")); + org.openjdk.jmc.common.item.ItemFilters.type("datadog.HeapLiveObject")); for (IItemIterable iterable : liveObjects) { IType type = iterable.getType(); IMemberAccessor leakTagAccessor = ReferenceChainAssertions.findAccessor(type, "leakTag"); IMemberAccessor objectClassAccessor = ReferenceChainAssertions.findAccessor(type, "objectClass"); - IMemberAccessor incarnationAccessor = - ReferenceChainAssertions.findAccessor(type, "leakTagIncarnation"); - // Fail loud if either identity field is missing: without the tag, every - // live object reads -1 and never matches the chain's targetTag; without - // the incarnation, the match degrades to tag-only, which a recycled - // tag's stale chunk could satisfy. Both must surface as errors, not as - // an empty correlation with no diagnostic. - if (incarnationAccessor == null) { - throw new IllegalStateException( - "datadog.HeapLiveObject events have no leakTagIncarnation accessor"); - } - if (leakTagAccessor == null) { - throw new IllegalStateException( - "datadog.HeapLiveObject events have no leakTag accessor"); - } for (IItem item : iterable) { - long leakTag = - ReferenceChainAssertions.numberValue(leakTagAccessor.getMember(item)); - long incarnation = - ReferenceChainAssertions.numberValue(incarnationAccessor.getMember(item)); - // Leak tags are recycled: the tag alone is ambiguous across chunks. - // An unresolved -1 incarnation is a hard mismatch, never a tag-only - // match: a stale chunk that inherited the recycled tag must not - // count as this chain's live object. - if (incarnation == -1 - || leakTag != result.payloadChain.targetTag - || incarnation != result.payloadChainIncarnation) { + long leakTag = leakTagAccessor != null + ? ReferenceChainAssertions.numberValue(leakTagAccessor.getMember(item)) : -1; + if (leakTag != result.payloadChain.targetTag) { continue; } Object objectClass = objectClassAccessor != null From 2b7386e8f622247465e8614df29b86dfe564de51 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Mon, 12 Oct 2026 10:00:57 +0200 Subject: [PATCH 02/17] javaApi: re-baseline class-map generation in the population reset seam selectLeakCandidates() returns nothing while classMap()->generation() differs from the tracker's baseline, and that baseline is only re-synced by cleanup_table()'s GC-driven sweep. A test JVM typically runs several recordings before a seeding test, each start() bumping the generation, and no GC may land between start() and the seeded select call. After the reset seam's wipe no stale-namespace population data remains, so adopt the current generation. --- ddprof-lib/src/main/cpp/javaApi.cpp | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/ddprof-lib/src/main/cpp/javaApi.cpp b/ddprof-lib/src/main/cpp/javaApi.cpp index f9365be145..8e53d568f5 100644 --- a/ddprof-lib/src/main/cpp/javaApi.cpp +++ b/ddprof-lib/src/main/cpp/javaApi.cpp @@ -1181,11 +1181,8 @@ Java_com_datadoghq_profiler_JavaProfiler_resetKlassPopulationForTest0( // recordings (each Profiler::start() clearAll() bumps the generation) // before this test's seeding, and no GC may land between start() and // the seeded selectLeakCandidates() call. After the wipe above there is - // no stale-namespace population data left, and - // classMapGenerationSetForTest() itself invalidates every tracking entry's - // cached_klass_id when the generation changes (the same thing - // cleanup_table()'s reset branch does), so adopting the current - // generation is safe. + // no stale-namespace population data left to protect, so adopting the + // current generation is safe. LivenessTracker::instance()->classMapGenerationSetForTest( Profiler::instance()->classMap()->generation()); } From 95693bbaa301f756935d5b3604f6169e40d3c779 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Mon, 12 Oct 2026 10:09:23 +0200 Subject: [PATCH 03/17] Add reference-chain repro, sweep, and reporting tooling --- .claude/commands/build-and-summarize | 169 ++++++++++- .gitignore | 14 +- ddprof-stresstest/build.gradle.kts | 39 +++ .../com/datadoghq/profiler/chaos/Main.java | 2 + .../chaos/ReferenceChainLeakAntagonist.java | 106 +++++++ .../repro/ReferenceChainLeakDemo.java | 282 ++++++++++++++++++ utils/compare-refchains-repro.sh | 163 ++++++++++ utils/refchains-jfr-metrics.py | 79 +++++ utils/refchains-report-multi.py | 254 ++++++++++++++++ utils/refchains-report.py | 231 ++++++++++++++ utils/run-chaos-harness.sh | 38 ++- utils/run-refchains-repro.sh | 136 +++++++++ utils/sweep-refchains-all.sh | 149 +++++++++ utils/sweep-refchains-budgets.sh | 139 +++++++++ utils/vendor/chart.umd.min.js | 14 + 15 files changed, 1796 insertions(+), 19 deletions(-) create mode 100644 ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java create mode 100644 ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java create mode 100755 utils/compare-refchains-repro.sh create mode 100644 utils/refchains-jfr-metrics.py create mode 100644 utils/refchains-report-multi.py create mode 100644 utils/refchains-report.py create mode 100755 utils/run-refchains-repro.sh create mode 100644 utils/sweep-refchains-all.sh create mode 100644 utils/sweep-refchains-budgets.sh create mode 100644 utils/vendor/chart.umd.min.js diff --git a/.claude/commands/build-and-summarize b/.claude/commands/build-and-summarize index 3923dc7df0..0056df710a 100755 --- a/.claude/commands/build-and-summarize +++ b/.claude/commands/build-and-summarize @@ -72,13 +72,164 @@ else echo "✖ Gradle failed with status $status. Full log at: $LOG" fi -# Hand over to your logs analyst agent — keep the main session output tiny. +# Generate the summary artifacts deterministically — no LLM, no claude spawn. +# (The old tail spawned a headless `claude` per build; managed settings pin that +# to sonnet-5 via the AI gateway, billing real money for every log parse.) echo -echo "Delegating to gradle-logs-analyst agent…" -# If your CLI supports non-streaming, set it here to avoid verbose output. -# Example (uncomment if supported): export CLAUDE_NO_STREAM=1 - -# Sub-agents would inherit the full parent env, including CLAUDECODE, which -# apparently causes problems with some versions of Claude (e.g. 4.6). -unset CLAUDECODE -claude "Act as the gradle-logs-analyst agent to parse the build log at: $LOG. Generate the required Gradle summary artifacts as specified in the gradle-logs-analyst agent definition." +echo "Generating gradle summary…" +python3 - "$LOG" <<'PYEOF' || echo "⚠ gradle summary generation failed — full log at: $LOG" +import json, os, re, sys + +log_path = sys.argv[1] if len(sys.argv) > 1 else "" +OUT_DIR = os.path.join("build", "reports", "claude") +MD = os.path.join(OUT_DIR, "gradle-summary.md") +JS = os.path.join(OUT_DIR, "gradle-summary.json") + +status, total_time, cur_task = "UNKNOWN", None, None +failed_tasks, headlines, dep_issues, test_failures = [], [], [], [] +warnings, seen_warnings = [], set() +tests = {"total": 0, "failed": 0, "skipped": 0, "modules": {}} + +RE_STATUS = re.compile(r"^BUILD (SUCCESSFUL|FAILED)(?: in (.+?))?\s*$") +RE_TASK = re.compile(r"^> Task (\S+)") +RE_GSUM = re.compile(r"(\d+) tests? (successful|failed|skipped)") +RE_COMP = re.compile(r"(\d+) tests? completed(?:, (\d+) failed)?(?:, (\d+) skipped)?") +RE_GTEST_P = re.compile(r"\[ PASSED \] (\d+) tests?") +RE_GTEST_F = re.compile(r"\[ FAILED \] (\d+) tests?") +RE_DEP = re.compile(r"Could not (?:resolve|find|get)|timed out|status code: 40[13]|artifact .* not found", re.I) +RE_WARN = re.compile(r"\bw: |warning:|deprecat", re.I) + +def mod(name): + return tests["modules"].setdefault(name, {"total": 0, "failed": 0, "skipped": 0}) + +def add_counts(name, ok, failed, skipped): + m = mod(name) + m["total"] += ok + failed + skipped + m["failed"] += failed + m["skipped"] += skipped + tests["total"] += ok + failed + skipped + tests["failed"] += failed + tests["skipped"] += skipped + +if not log_path or not os.path.isfile(log_path) or os.path.getsize(log_path) == 0: + why = f"log not found: {log_path!r}" if not log_path or not os.path.isfile(log_path) else "log is empty" + os.makedirs(OUT_DIR, exist_ok=True) + open(MD, "w").write(f"# Gradle Summary\n\n- Status: UNKNOWN ({why})\n\nFull log unavailable or empty.\n") + json.dump({"status": "UNKNOWN", "totalTime": None, "failedTasks": [], "warnings": [], + "tests": tests, "slowTasks": [], "depIssues": [why], "actions": []}, open(JS, "w"), indent=1) + print(f"Gradle log unusable ({why}); wrote {MD} and {JS}") + sys.exit(0) + +grab_headline = False +with open(log_path, encoding="utf-8", errors="replace") as f: + for line in f: + line = line.rstrip("\n") + m = RE_STATUS.match(line) + if m: + status = m.group(1) + total_time = m.group(2) + continue + m = RE_TASK.match(line) + if m: + cur_task = m.group(1) + if line.endswith("FAILED") and m.group(1) not in failed_tasks: + failed_tasks.append(m.group(1)) + continue + if "FAILURE: Build failed with an exception" in line: + grab_headline = True + continue + if grab_headline and line.strip().startswith("* What went wrong"): + headlines.append("") + continue + if grab_headline: + s = line.strip() + if s.startswith("*") or not s: + if headlines and headlines[-1]: + grab_headline = False + continue + if len(headlines[-1]) < 200: + headlines[-1] += (" " if headlines[-1] else "") + s + continue + m = RE_COMP.search(line) + if m: + total = int(m.group(1)) + failed = int(m.group(2) or 0) + skipped = int(m.group(3) or 0) + add_counts(cur_task or "(unknown)", total - failed - skipped, failed, skipped) + continue + m = RE_GSUM.search(line) + if m: + n, verb = int(m.group(1)), m.group(2) + mm = mod(cur_task or "(unknown)") + mm["total"] += n + tests["total"] += n + if verb == "failed": + mm["failed"] += n + tests["failed"] += n + elif verb == "skipped": + mm["skipped"] += n + tests["skipped"] += n + continue + m = RE_GTEST_P.search(line) + if m: + add_counts(cur_task or "(gtest)", int(m.group(1)), 0, 0) + continue + m = RE_GTEST_F.search(line) + if m: + add_counts(cur_task or "(gtest)", 0, int(m.group(1)), 0) + continue + if re.search(r" > \S+(?:\.\S+)+.* FAILED$", line) or re.search(r"\[ FAILED \] (\S+)", line): + test_failures.append(line.strip()) + continue + if RE_DEP.search(line) and len(dep_issues) < 20: + if line not in dep_issues: + dep_issues.append(line.strip()) + continue + wm = RE_WARN.search(line) + if wm and len(warnings) < 40: + key = line.strip()[:160] + if key not in seen_warnings: + seen_warnings.add(key) + warnings.append(key) + +failed = [t + (" — " + h if h else "") for t, h in zip(failed_tasks, headlines + [""] * len(failed_tasks))] +data = {"status": status, "totalTime": total_time, "failedTasks": failed, "warnings": warnings, + "tests": tests, "slowTasks": [], "depIssues": dep_issues, "actions": []} + +os.makedirs(OUT_DIR, exist_ok=True) +with open(JS, "w") as f: + json.dump(data, f, indent=1) + +L = ["# Gradle Summary\n", f"- Status: {status}", f"- Total time: {total_time or 'UNKNOWN'}", + f"- Log: {log_path}\n"] +if failed: + L.append("## Failing Tasks") + L += [f"- {t}" for t in failed] + L.append("") +if headlines: + L.append("## Primary Failure") + L += [f"```text\n{h}\n```" for h in headlines[:3] if h] + L.append("") +if tests["total"]: + L.append("## Tests") + L.append(f"- Total: {tests['total']}, failed: {tests['failed']}, skipped: {tests['skipped']}") + for name, m in tests["modules"].items(): + L.append(f" - {name}: {m['total']} total, {m['failed']} failed, {m['skipped']} skipped") + if test_failures: + L.append("- Top failing tests:") + L += [f" - {t}" for t in test_failures[:10]] + L.append("") +if warnings: + L.append("## Warnings") + L += [f"- {w}" for w in warnings[:20]] + L.append("") +if dep_issues: + L.append("## Dependency / Network Issues") + L += [f"- {d}" for d in dep_issues[:10]] + L.append("") +L.append("- Per-task durations are not present in plain `-i` console logs; slowTasks omitted.") +open(MD, "w").write("\n".join(L) + "\n") + +print(f"{status} (time: {total_time or 'n/a'}); {len(failed)} failing task(s), {tests['failed']} test failure(s)") +print(f"Wrote {MD} and {JS}") +PYEOF diff --git a/.gitignore b/.gitignore index 38ff268849..61e98e96a3 100644 --- a/.gitignore +++ b/.gitignore @@ -51,4 +51,16 @@ __pycache__/ # CLAUDE.md is auto-generated from AGENTS.md bootstrap instructions CLAUDE.md -.sphinx +# OS/editor cruft +.DS_Store + +# AI review/agent tooling scratch state +.sphinx/ +.skill-builder-temp/ +.claude/scheduled_tasks.lock + +# Python bytecode cache +*.pyc + +# AI investigation scratch state (never committed) +.investigations/ diff --git a/ddprof-stresstest/build.gradle.kts b/ddprof-stresstest/build.gradle.kts index 550baee43b..67896f2b7d 100644 --- a/ddprof-stresstest/build.gradle.kts +++ b/ddprof-stresstest/build.gradle.kts @@ -101,6 +101,45 @@ tasks.register("chaosJar") { } } +// --- reference-chains repro app --------------------------------------------- +// Plain, dependency-free demo app for manually reproducing the reference-chains +// feature: launched directly with `-agentpath:libjavaProfiler.so=start,...` +// (no dd-trace-java agent, no dynamic attach), so it deliberately has zero +// compile/runtime dependency on ddprof-lib or dd-trace - the profiler is +// entirely out-of-process from this app's own point of view. + +sourceSets { + create("repro") +} + +dependencies { + // ddprof-lib's Java API only - not the native library itself (that's the one + // already loaded in-process via -agentpath). Used solely to call + // JavaProfiler.getInstance().dump(...) periodically: Profiler::dump() + // (profiler.cpp) is the only code path that drains ReferenceChainTracker's + // pending chain-event queue and actually writes datadog.ReferenceChain into + // the JFR file - nothing does this automatically on a timer, and in + // production it's dd-trace-java's own recording-chunk rotation that calls + // it. Without this dependency+call, chain events get built and enqueued + // (visible in TEST_LOG output) but are silently dropped when the process + // exits, and the JFR file never shows a single datadog.ReferenceChain event. + "reproImplementation"(project(mapOf("path" to ":ddprof-lib", "configuration" to "debug"))) +} + +tasks.register("reproJar") { + group = "build" + description = "Demo app that leaks memory in a controlled way, for manually reproducing reference-chains via -agentpath" + archiveFileName.set("refchains_repro.jar") + from(sourceSets["repro"].output) + from({ + configurations["reproRuntimeClasspath"].map { if (it.isDirectory) it else zipTree(it) } + }) + duplicatesStrategy = DuplicatesStrategy.EXCLUDE + manifest { + attributes("Main-Class" to "com.datadoghq.profiler.repro.ReferenceChainLeakDemo") + } +} + tasks.register("runStressTests") { dependsOn(tasks.named("jmhJar")) diff --git a/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/Main.java b/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/Main.java index 7e846c02d1..a8e51e8666 100644 --- a/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/Main.java +++ b/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/Main.java @@ -92,6 +92,8 @@ private static Antagonist create(String name) { return new WeakRefWaveAntagonist(); case "dump-storm": return new DumpStormAntagonist(); + case "reference-chain-leak": + return new ReferenceChainLeakAntagonist(); case "reapply-context-value": return new ReapplyContextValueAntagonist(); // Deferred: dlopen-churn (needs per-arch dummy .so built in CI prep). diff --git a/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java b/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java new file mode 100644 index 0000000000..a63c613752 --- /dev/null +++ b/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java @@ -0,0 +1,106 @@ +/* + * Copyright 2026, Datadog, Inc + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + */ +package com.datadoghq.profiler.chaos; + +import java.time.Duration; +import java.util.Map; +import java.util.concurrent.ConcurrentHashMap; + +/** + * Grows an ever-referenced, never-evicted cache to give the reference-chains + * feature (LivenessTracker/ReferenceChainTracker) a real, steadily growing + * population to detect and walk. Growth is capped, not open-ended: once + * {@link #CAP_ENTRIES} is reached the cache stops growing and the antagonist + * just holds it there for the rest of the run, so a long chaos duration + * (hours) still produces the same bounded leak instead of eventually OOMing + * the JVM out from under the other antagonists sharing its heap. + * + *

    Same object shape as {@code LeakingCacheScenario.CachedPayload} + * (ddprof-test's reference-chain integration test) — plain long fields + * rather than a nested array, so a single instance clears the allocation + * sampler's real size floor without a second, competing heap allocation per + * entry. + */ +public final class ReferenceChainLeakAntagonist implements Antagonist { + + // ~64MiB of CachedEntry payloads at steady state (entries are a little + // over 300 bytes with object header/field overhead) — enough for the + // liveness tracker's population-growth trend detection to have a real, + // sustained trend to lock onto, without meaningfully competing with the + // other antagonists' own memory budget for the run's whole duration. + private static final int CAP_ENTRIES = 200_000; + private static final int BATCH_SIZE = 200; + private static final long BATCH_INTERVAL_MS = 50L; + + private final Map cache = new ConcurrentHashMap<>(); + private volatile boolean running; + private Thread growthDriver; + private long nextKey; + + @Override + public String name() { + return "reference-chain-leak"; + } + + @Override + public void start() { + running = true; + growthDriver = new Thread(this::growthLoop, "chaos-refchain-leak"); + growthDriver.setDaemon(true); + growthDriver.start(); + } + + @Override + public void stopGracefully(Duration timeout) { + running = false; + try { + growthDriver.join(timeout.toMillis()); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + } + } + + private void growthLoop() { + while (running && cache.size() < CAP_ENTRIES) { + for (int i = 0; i < BATCH_SIZE && cache.size() < CAP_ENTRIES; i++) { + String key = "refchain-leak-" + (nextKey++); + cache.put(key, new CachedEntry(key)); + MemoryGovernor.pace(); + } + try { + Thread.sleep(BATCH_INTERVAL_MS); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + return; + } + } + // Cap reached: keep the reference alive (do nothing) for the rest of + // the run instead of exiting the thread, so `cache` stays reachable + // via this antagonist's own field for as long as the harness runs. + while (running) { + try { + Thread.sleep(1_000L); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + return; + } + } + } + + static final class CachedEntry { + final String key; + long p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15; + long p16, p17, p18, p19, p20, p21, p22, p23, p24, p25, p26, p27, p28, p29, p30, p31; + + CachedEntry(String key) { + this.key = key; + } + } +} diff --git a/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java b/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java new file mode 100644 index 0000000000..0416a1fea1 --- /dev/null +++ b/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java @@ -0,0 +1,282 @@ +/* + * Copyright 2026, Datadog, Inc + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + */ +package com.datadoghq.profiler.repro; + +import com.datadoghq.profiler.JavaProfiler; +import java.lang.management.ManagementFactory; +import java.lang.management.MemoryUsage; +import java.nio.file.Path; +import java.nio.file.Paths; +import java.util.HashMap; +import java.util.Map; + +/** + * Standalone demo app for manually reproducing the reference-chains feature end-to-end. + * Meant to be launched directly with the native agent loaded at JVM startup, e.g. + * + * 

    + * java -agentpath:/path/to/libjavaProfiler.so=start,memory=64:l,generations=true,\
+ *   referencechains=true:hops=64:budget=4000:ttl=120000:framecap=2000000:\
+ *   pausetarget=5000:painbudget=100,jfr,file=repro.jfr \
+ *   -jar refchains_repro.jar repro.jfr /path/to/libjavaProfiler.so
+ *
    + * + *

    Takes the JFR output path as {@code args[0]} (must match {@code file=} above) and the + * agent's own {@code .so} path as {@code args[1]} (must match the {@code -agentpath} value + * above), and periodically calls {@link JavaProfiler#dump}. Both are load-bearing: + * + *

    An optional {@code args[2]} duration in seconds switches from the default "run forever" + * manual mode to a bounded session that dumps once more and prints a single {@code [metrics]} + * line at exit (throughput, round latency, heap growth) - see + * {@code utils/compare-refchains-repro.sh}, which runs this app twice (referencechains on vs. + * off) over the same duration and diffs those lines against each run's safepoint/GC logs. + *

      + *
    • The dump call itself: {@code Profiler::dump()} (profiler.cpp) is the only code path + * that drains {@code ReferenceChainTracker}'s pending chain-event queue and actually writes + * {@code datadog.ReferenceChain} into the JFR file - nothing drains that queue on a timer, + * and in production it's dd-trace-java's own periodic recording-chunk rotation that calls + * {@code dump()}. Without it, chain events get built and enqueued (visible via {@code + * TEST_LOG}) but are silently discarded when the process exits. + *
    • Passing the {@code .so} path explicitly to {@link JavaProfiler#getInstance(String, + * String)}: with no {@code libLocation}, {@code getInstance()} extracts the jar's own + * bundled copy of the library to a fresh temp file and {@code System.load()}s that + * instead of attaching to the one {@code -agentpath} already loaded - a second, never-{@code + * start()}-ed {@code Profiler} singleton whose {@code dump()} calls are silent no-ops. + * Passing the same path lets the dynamic linker dedup the load onto the already-running + * singleton, the same way dd-trace-java attaches to its own {@code -agentpath} agent. + *
    + * + *

    Deliberately omits {@code firstpassbudget}: the tracker auto-scales its + * first pass's budget from the plain {@code budget} value + * ({@code ReferenceChainTracker::AUTO_FIRST_PASS_BUDGET_MULTIPLIER}, capped at + * {@code AUTO_FIRST_PASS_BUDGET_CAP}, referenceChains.h) rather than reusing + * {@code budget} as-is for that first, cold root-seeded walk - reusing it directly + * truncates every pass before it gets anywhere near this app's {@code CachedEntry} + * population, and the target's JVMTI tag stays 0 forever. Pass + * {@code firstpassbudget=N} explicitly only to override that auto-scaled default. + * + *

    Grows an ever-referenced, never-evicted {@code HashMap}-backed cache (same shape as + * ddprof-test's {@code LeakingCacheScenario}/the chaos harness's {@code + * ReferenceChainLeakAntagonist}). Two things this app does deliberately, both found the hard + * way by running it without them and never seeing a chain get discovered: + * + *

      + *
    • Explicit {@code System.gc()} every round. {@code LivenessTracker}'s + * population-growth trend ({@code computeKlassPopulationSlope}, livenessTracker.cpp) needs at + * least {@code KLASS_POPULATION_MIN_FILL_FOR_TREND} (10) distinct GC epochs of population + * samples before it will even attempt a slope, and {@code _gc_epoch} only advances on a + * {@code GarbageCollectionFinish} JVMTI callback - i.e. on an actual GC. Left to whatever GCs + * the JVM decides to run on its own, a slow, modest allocation rate against a large default + * heap can go many minutes without a single GC, so the epoch count - and therefore the trend - + * never moves. Forcing a GC every round (same pattern {@code LeakingCacheScenario}'s round + * loop and {@code ReferenceChainTrackingTest} already rely on) turns epoch progress into + * something this app controls directly instead of leaving it to chance. + *
    • No hard stop. A cache that grows to a fixed cap and then sits flat stops being a + * growing population the instant it stops growing - {@code computeKlassPopulationSlope} + * compares the earliest vs. most recent third of its 30-epoch ring, so a long enough flat + * period after the cap pushes the slope back to zero (or the real growth epochs age out of the + * ring before the search ever gets scheduled/its own pain-budget cooldown clears). This app + * keeps growing forever instead, self-throttling its own pace against a heap-usage watermark + * (see {@link #run}) so it stays a real, positive, continuously-observable trend without ever + * growing fast/large enough to actually exhaust the heap. + *
    + * + *

    Seeds the cache with an initial batch on the very first line of {@code main} - before + * printing anything or sleeping - so the agent's one-shot, root-seeded first pass (which fires + * roughly a second after the agent's own background thread starts, i.e. before {@code + * Agent_OnLoad} even returns control to this class's {@code main}) has a real chance of finding + * {@code cache} already non-empty. See {@code LeakingCacheScenario}'s own comment for the full + * story of why that ordering is load-bearing. + */ +public final class ReferenceChainLeakDemo { + + // Heap-usage watermarks gating growth pace, mirroring the chaos harness's own + // MemoryGovernor - a much simpler version since this app has only one grower to pace, + // not several antagonists sharing a budget. + private static final double HIGH_WATERMARK = 0.70; + private static final double CRITICAL_WATERMARK = 0.85; + + private static final int NORMAL_BATCH_SIZE = 2_000; + private static final int THROTTLED_BATCH_SIZE = 100; + private static final long ROUND_INTERVAL_MS = 300L; + private static final long THROTTLED_ROUND_INTERVAL_MS = 2_000L; + + // How often to call JavaProfiler.dump() to drain any pending reference-chain + // events into the JFR file - see this class's own header comment for why this + // call, not just this app's own memory growth, is load-bearing for the repro. + private static final int DUMP_EVERY_N_ROUNDS = 10; + + public static void main(String[] args) throws Exception { + if (args.length < 2) { + System.err.println("usage: ReferenceChainLeakDemo [duration-seconds] " + + "(both required args must match the -agentpath:=...jfr,file= values; " + + "duration-seconds runs a bounded, metrics-reporting session instead of forever)"); + System.exit(1); + } + long durationSeconds = args.length >= 3 ? Long.parseLong(args[2]) : -1; + run(Paths.get(args[0]), args[1], durationSeconds); + } + + // FlightRecorder::dump() (flightRecorder.cpp) rejects dumping the continuous recording to + // its own file= path ("Can not dump recording to itself"), so periodic drains must target + // a different path; this is that path's suffix. + private static final String SNAPSHOT_SUFFIX = ".snapshot"; + + // Tracked so a bounded run (durationSeconds >= 0) can report throughput/latency/memory + // deltas at exit for A/B comparison against a referencechains=false baseline - see + // utils/compare-refchains-repro.sh. + private static long roundCount = 0; + private static long totalEntriesAdded = 0; + private static long totalRoundNanos = 0; + private static long maxRoundNanos = 0; + + private static void run(Path recordingPath, String agentSoPath, long durationSeconds) throws InterruptedException { + // Must differ from recordingPath itself - see SNAPSHOT_SUFFIX's comment. + Path snapshotPath = recordingPath.resolveSibling(recordingPath.getFileName() + SNAPSHOT_SUFFIX); + // Must pass the exact .so path -agentpath already loaded: JavaProfiler.getInstance() + // with no libLocation extracts the jar's own bundled copy to a fresh temp file and + // System.load()s *that* instead, producing a second, never-started Profiler singleton + // completely disconnected from the real profiling session - dump() calls against it + // are silent no-ops. Passing the same path here lets the dynamic linker dedup the + // load to the already-mapped library, i.e. the real, already-running singleton. + JavaProfiler profiler; + try { + profiler = JavaProfiler.getInstance(agentSoPath, null); + } catch (Exception e) { + throw new IllegalStateException( + "JavaProfiler.getInstance() failed - was this launched with " + + "-agentpath:libjavaProfiler.so=start,...?", e); + } + + Map cache = new HashMap<>(); + seed(cache, 300); + + System.out.println("[repro] pid=" + pid() + + " - growing cache " + (durationSeconds >= 0 ? ("for " + durationSeconds + "s") : "forever") + + ", forcing a GC every round so the profiler's " + + "population-growth trend detection has real epochs to work with; watch " + + "heapUsedMb/heapMaxMb and attach/dump once a chain shows up"); + + long startNanos = System.nanoTime(); + long deadlineNanos = durationSeconds >= 0 ? startNanos + durationSeconds * 1_000_000_000L : Long.MAX_VALUE; + long startHeapUsedMb = heapUsedMb(); + + long nextKey = 300; + int round = 0; + while (System.nanoTime() < deadlineNanos) { + long roundStartNanos = System.nanoTime(); + round++; + double heapFraction = heapUsedFraction(); + int batchSize = heapFraction >= HIGH_WATERMARK ? THROTTLED_BATCH_SIZE : NORMAL_BATCH_SIZE; + long roundIntervalMs = heapFraction >= HIGH_WATERMARK ? THROTTLED_ROUND_INTERVAL_MS : ROUND_INTERVAL_MS; + + if (heapFraction < CRITICAL_WATERMARK) { + for (int i = 0; i < batchSize; i++) { + String key = "leak-" + (nextKey++); + cache.put(key, new CachedEntry(key)); + } + totalEntriesAdded += batchSize; + } else { + System.out.println("[repro] heap usage critical (" + pct(heapFraction) + + ") - pausing growth this round, attach/dump now if you haven't"); + } + + // Forces a GC every round regardless of watermark state, so _gc_epoch (and + // therefore the population-growth ring) keeps advancing even while paused/ + // throttled - see this class's own header comment for why that's load-bearing. + System.gc(); + + if (round % 10 == 0 || heapFraction >= HIGH_WATERMARK) { + System.out.println("[repro] round=" + round + " cache.size()=" + cache.size() + + " heapUsedMb=" + heapUsedMb() + " heapFraction=" + pct(heapFraction)); + } + + if (round % DUMP_EVERY_N_ROUNDS == 0) { + profiler.dump(snapshotPath); + } + + long roundNanos = System.nanoTime() - roundStartNanos; + roundCount++; + totalRoundNanos += roundNanos; + maxRoundNanos = Math.max(maxRoundNanos, roundNanos); + + Thread.sleep(roundIntervalMs); + } + + if (durationSeconds >= 0) { + profiler.dump(snapshotPath); + reportMetrics(startNanos, startHeapUsedMb); + } + } + + // Printed with a distinct "[metrics]" prefix so utils/compare-refchains-repro.sh can grep + // it out of the two runs' stdout (referencechains=true vs. false) and diff throughput/ + // latency/memory-growth directly, without needing to touch the safepoint/GC logs for those. + private static void reportMetrics(long startNanos, long startHeapUsedMb) { + long wallNanos = System.nanoTime() - startNanos; + double wallSeconds = wallNanos / 1_000_000_000.0; + double avgRoundMs = roundCount == 0 ? 0 : (totalRoundNanos / (double) roundCount) / 1_000_000.0; + double maxRoundMs = maxRoundNanos / 1_000_000.0; + double entriesPerSec = wallSeconds > 0 ? totalEntriesAdded / wallSeconds : 0; + long heapGrowthMb = heapUsedMb() - startHeapUsedMb; + + System.out.println("[metrics] wallSeconds=" + String.format("%.1f", wallSeconds) + + " rounds=" + roundCount + + " entriesAdded=" + totalEntriesAdded + + " entriesPerSec=" + String.format("%.1f", entriesPerSec) + + " avgRoundMs=" + String.format("%.3f", avgRoundMs) + + " maxRoundMs=" + String.format("%.3f", maxRoundMs) + + " heapUsedMbStart=" + startHeapUsedMb + + " heapUsedMbEnd=" + heapUsedMb() + + " heapGrowthMb=" + heapGrowthMb); + } + + private static void seed(Map cache, int count) { + for (int i = 0; i < count; i++) { + String key = "seed-" + i; + cache.put(key, new CachedEntry(key)); + } + } + + private static String pid() { + String name = ManagementFactory.getRuntimeMXBean().getName(); + int at = name.indexOf('@'); + return at >= 0 ? name.substring(0, at) : name; + } + + private static long heapUsedMb() { + return ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getUsed() / (1024 * 1024); + } + + private static double heapUsedFraction() { + MemoryUsage heap = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); + return heap.getMax() > 0 ? (double) heap.getUsed() / (double) heap.getMax() : 0.0; + } + + private static String pct(double fraction) { + return String.format("%.1f%%", fraction * 100.0); + } + + /** + * Same shape as {@code LeakingCacheScenario.CachedPayload}/{@code + * ReferenceChainLeakAntagonist.CachedEntry}: plain long fields, not a nested array, so a + * single instance clears the allocation sampler's real size floor without a second, + * competing heap allocation per entry. + */ + static final class CachedEntry { + final String key; + long p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15; + long p16, p17, p18, p19, p20, p21, p22, p23, p24, p25, p26, p27, p28, p29, p30, p31; + + CachedEntry(String key) { + this.key = key; + } + } +} diff --git a/utils/compare-refchains-repro.sh b/utils/compare-refchains-repro.sh new file mode 100755 index 0000000000..0eaee3c90f --- /dev/null +++ b/utils/compare-refchains-repro.sh @@ -0,0 +1,163 @@ +#!/usr/bin/env bash +# +# Runs the reference-chains repro app (run-refchains-repro.sh) twice, back to +# back, over an identical bounded window - once with referencechains=true and +# once with referencechains=false - and diffs the two runs' throughput, +# safepoint/GC pause times, and heap growth, to answer: +# - is it slower overall (throughput/round latency)? +# - is it imposing lengthy STW safepoints (safepoint/GC log)? +# - is it increasing memory usage significantly (heap growth, peak RSS)? +# +# Prints a markdown comparison table plus explicit answers to those three +# questions, and saves the same content as report.md in the run's temp +# working directory alongside the raw stdout/safepoint logs. +# +# Usage: compare-refchains-repro.sh [duration-seconds] +# +# Env vars: same REFCHAINS_SO/REFCHAINS_JAR/REFCHAINS_ARGS/REFCHAINS_JAVA_HOME/ +# REFCHAINS_GC as run-refchains-repro.sh - passed through unchanged to both +# variants so the two runs stay comparable (REFCHAINS_ENABLED is set by this +# script itself, per run - don't set it yourself). + +set -euo pipefail + +HERE="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )" + +DURATION_SECONDS="${1:-120}" +WORKDIR="$(mktemp -d /tmp/refchains_compare.XXXXXX)" + +JDK_DESC="${REFCHAINS_JAVA_HOME:-java on PATH}" +GC_DESC="${REFCHAINS_GC:-JVM ergonomic default}" + +echo "Comparing referencechains=true vs. false over ${DURATION_SECONDS}s each" +echo "JDK: ${JDK_DESC}" +echo "GC: ${GC_DESC}" +echo "Working directory: ${WORKDIR}" + +run_variant() { + local label="$1" enabled="$2" jfr="${WORKDIR}/${1}.jfr" + echo + echo "=== running variant '${label}' (referencechains=${enabled}) ===" + REFCHAINS_ENABLED="${enabled}" "${HERE}/run-refchains-repro.sh" "${jfr}" "${DURATION_SECONDS}" \ + > "${WORKDIR}/${label}.stdout.log" 2>&1 & + local pid=$! + + # Peak RSS while the JVM runs - the -Xlog heap numbers only cover Java heap, + # not native/off-heap growth (e.g. the tracker's own chain-storage arena). + local peak_rss_kb=0 + while kill -0 "${pid}" 2>/dev/null; do + local rss + rss=$(ps -o rss= -p "${pid}" 2>/dev/null | tr -d ' ' || true) + if [ -n "${rss}" ] && [ "${rss}" -gt "${peak_rss_kb}" ]; then + peak_rss_kb="${rss}" + fi + sleep 1 + done + wait "${pid}" || echo "WARN: variant '${label}' exited non-zero" + echo "${peak_rss_kb}" > "${WORKDIR}/${label}.peak_rss_kb" +} + +run_variant "on" "true" +run_variant "off" "false" + +# Parses one variant's logs and echoes a single space-separated line of +# metrics (entriesPerSec avgRoundMs maxRoundMs heapGrowthMb stwCount stwTotalSec +# stwAvgSec stwMaxSec peakRssKb wallSeconds), so both variants can be captured +# into shell variables and diffed numerically rather than eyeballed as text. +parse_variant() { + local label="$1" + local stdout="${WORKDIR}/${label}.stdout.log" + local safepoint_log="${WORKDIR}/${label}.jfr.safepoint.log" + local peak_rss_kb + peak_rss_kb=$(cat "${WORKDIR}/${label}.peak_rss_kb" 2>/dev/null || echo 0) + + local metrics_line + metrics_line=$(grep '^\[metrics\]' "${stdout}" || true) + local wall_seconds entries_per_sec avg_round_ms max_round_ms heap_growth_mb + wall_seconds=$(echo "${metrics_line}" | grep -oE 'wallSeconds=[0-9.]+' | cut -d= -f2 || true) + entries_per_sec=$(echo "${metrics_line}" | grep -oE 'entriesPerSec=[0-9.]+' | cut -d= -f2 || true) + avg_round_ms=$(echo "${metrics_line}" | grep -oE 'avgRoundMs=[0-9.]+' | cut -d= -f2 || true) + max_round_ms=$(echo "${metrics_line}" | grep -oE 'maxRoundMs=[0-9.]+' | cut -d= -f2 || true) + heap_growth_mb=$(echo "${metrics_line}" | grep -oE 'heapGrowthMb=-?[0-9]+' | cut -d= -f2 || true) + + # Unified-logging safepoint format (JDK 17+, -Xlog:safepoint*): one line per + # safepoint event, e.g. `[safepoint] Safepoint "G1CollectFull", Time since + # last: ... ns, ..., Total: 11011880 ns`. "Total" is the full STW window for + # that safepoint (sync + cleanup + vmop), which includes GC pauses since GC + # itself runs at a safepoint. Sum + max (converted ns -> s) across the run + # gives total/longest STW time. + # Two -Xlog safepoint line shapes across JDK versions: + # - JDK 17+: `Safepoint "name", ... Total: N ns` (one line, everything on it) + # - JDK <=16 (e.g. 11): `Total time for which application threads were + # stopped: N seconds, Stopping threads took: ...` (separate summary line, + # no per-name "Safepoint" prefix, value already in seconds not ns) + # Try the ns-based JDK17+ shape first; fall back to the seconds-based one. + local stw_stats + stw_stats=$(grep -oE 'Safepoint "[^"]+".*Total: [0-9]+ ns' "${safepoint_log}" 2>/dev/null \ + | grep -oE 'Total: [0-9]+ ns' \ + | grep -oE '[0-9]+' \ + | awk '{sec=$1/1e9; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + if [ -z "${stw_stats}" ]; then + stw_stats=$(grep -oE 'Total time for which application threads were stopped: [0-9.]+ seconds' "${safepoint_log}" 2>/dev/null \ + | grep -oE '[0-9.]+' \ + | awk '{sec=$1; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + fi + read -r stw_count stw_total stw_avg stw_max <<< "${stw_stats:-0 0 0 0}" + + echo "${entries_per_sec:-0} ${avg_round_ms:-0} ${max_round_ms:-0} ${heap_growth_mb:-0} ${stw_count} ${stw_total} ${stw_avg} ${stw_max} ${peak_rss_kb} ${wall_seconds:-0}" +} + +read -r on_entries on_avg_round on_max_round on_heap_growth on_stw_count on_stw_total on_stw_avg on_stw_max on_rss on_wall \ + <<< "$(parse_variant "on")" +read -r off_entries off_avg_round off_max_round off_heap_growth off_stw_count off_stw_total off_stw_avg off_stw_max off_rss off_wall \ + <<< "$(parse_variant "off")" + +# Percentage delta of "on" relative to "off": positive means "on" is worse +# (slower/longer-paused/more memory). Guards div-by-zero by falling back to 0. +pct_delta() { + awk -v on="$1" -v off="$2" 'BEGIN { + if (off == 0) { printf "n/a"; exit } + printf "%+.1f%%", ((on - off) / off) * 100.0 + }' +} + +throughput_delta_pct=$(pct_delta "${off_entries}" "${on_entries}") # off/on: lower throughput with refchains on is the "cost" +avg_round_delta_pct=$(pct_delta "${on_avg_round}" "${off_avg_round}") +stw_total_delta_pct=$(pct_delta "${on_stw_total}" "${off_stw_total}") +stw_max_delta_pct=$(pct_delta "${on_stw_max}" "${off_stw_max}") +heap_growth_delta_mb=$((on_heap_growth - off_heap_growth)) +rss_delta_kb=$((on_rss - off_rss)) +rss_delta_pct=$(pct_delta "${on_rss}" "${off_rss}") + +REPORT="${WORKDIR}/report.md" +{ + echo "# reference-chains overhead comparison" + echo + echo "referencechains=true vs. false, ${DURATION_SECONDS}s each. Raw logs: \`${WORKDIR}\`" + echo + echo "JDK: ${JDK_DESC} | GC: ${GC_DESC}" + echo + echo "| metric | on (refchains=true) | off (refchains=false) | delta (on vs. off) |" + echo "|---|---|---|---|" + echo "| entries/sec (throughput) | ${on_entries} | ${off_entries} | ${throughput_delta_pct} |" + echo "| avg round latency (ms) | ${on_avg_round} | ${off_avg_round} | ${avg_round_delta_pct} |" + echo "| max round latency (ms) | ${on_max_round} | ${off_max_round} | - |" + echo "| safepoint count | ${on_stw_count} | ${off_stw_count} | - |" + echo "| total STW stop time (s) | ${on_stw_total} | ${off_stw_total} | ${stw_total_delta_pct} |" + echo "| longest single STW pause (s) | ${on_stw_max} | ${off_stw_max} | ${stw_max_delta_pct} |" + echo "| heap growth (MB) | ${on_heap_growth} | ${off_heap_growth} | ${heap_growth_delta_mb} MB |" + echo "| peak RSS (KB) | ${on_rss} | ${off_rss} | ${rss_delta_pct} (${rss_delta_kb} KB) |" + echo + echo "## Answers" + echo + echo "- **Slower overall?** throughput ${throughput_delta_pct}, avg round latency ${avg_round_delta_pct} with referencechains on." + echo "- **Lengthy STW safepoints?** total stop time ${stw_total_delta_pct}, longest single pause ${on_stw_max}s (vs. ${off_stw_max}s off)." + echo "- **Memory usage up significantly?** heap grew ${heap_growth_delta_mb} MB more, peak RSS ${rss_delta_pct} (${rss_delta_kb} KB) with referencechains on." +} > "${REPORT}" + +echo +echo "===================== results =====================" +cat "${REPORT}" +echo +echo "Report saved to: ${REPORT}" +echo "Raw logs kept in: ${WORKDIR}" diff --git a/utils/refchains-jfr-metrics.py b/utils/refchains-jfr-metrics.py new file mode 100644 index 0000000000..68197c7c5b --- /dev/null +++ b/utils/refchains-jfr-metrics.py @@ -0,0 +1,79 @@ +#!/usr/bin/env python3 +"""Extracts reference-chains discovery-latency metrics from one repro run's +JFR snapshot: how many datadog.ReferenceChain/ReferenceChainAbandoned events +got recorded, and the wall-clock time from the recording's start to the +first ReferenceChain event (the feature's actual "time to first chain"). + +`jfr print`/`jfr summary` require a ".jfr" filename extension, which the +repro app's snapshot files (foo.jfr.snapshot) don't have - the caller must +pass a path already renamed/copied to end in .jfr. + +Usage: refchains-jfr-metrics.py +Prints one line: " " +(time_to_first_chain_s is -1 if no ReferenceChain event was recorded). +""" +import json +import re +import subprocess +import sys +from datetime import datetime, timezone + + +def run_jfr(args, path): + try: + result = subprocess.run(["jfr", *args, path], capture_output=True, text=True, check=True) + except (subprocess.CalledProcessError, FileNotFoundError) as e: + stderr = getattr(e, "stderr", None) or str(e) + print(f"error: 'jfr {' '.join(args)} {path}' failed: {stderr}", file=sys.stderr) + sys.exit(1) + return result.stdout + + +def jfr_recording_start(path): + out = run_jfr(["summary"], path) + m = re.search(r"^ Start:\s+(.+?)\s*\(UTC\)\s*$", out, re.MULTILINE) + if not m: + return None + return datetime.strptime(m.group(1).strip(), "%Y-%m-%d %H:%M:%S").replace(tzinfo=timezone.utc) + + +def jfr_event_times(path, event_name): + out = run_jfr(["print", "--events", event_name, "--json"], path) + try: + data = json.loads(out) + except json.JSONDecodeError as e: + print(f"error: could not parse 'jfr print --events {event_name} --json {path}' " + f"output as JSON: {e}", file=sys.stderr) + sys.exit(1) + times = [] + for ev in data.get("recording", {}).get("events", []): + st = ev.get("values", {}).get("startTime") or ev.get("startTime") + if st is None: + continue + # jfr --json timestamps look like "2026-07-24T11:38:20.123+00:00" + times.append(datetime.fromisoformat(st.replace("Z", "+00:00"))) + return times + + +def main(): + if len(sys.argv) < 2: + print("Usage: refchains-jfr-metrics.py ", file=sys.stderr) + sys.exit(1) + path = sys.argv[1] + start = jfr_recording_start(path) + chain_times = jfr_event_times(path, "datadog.ReferenceChain") + abandoned_times = jfr_event_times(path, "datadog.ReferenceChainAbandoned") + + chain_count = len(chain_times) + abandoned_count = len(abandoned_times) + if chain_times and start is not None: + first = min(chain_times) + time_to_first_s = max(0.0, (first - start).total_seconds()) + else: + time_to_first_s = -1 + + print(f"{chain_count} {abandoned_count} {time_to_first_s:.3f}") + + +if __name__ == "__main__": + main() diff --git a/utils/refchains-report-multi.py b/utils/refchains-report-multi.py new file mode 100644 index 0000000000..666eb7c13c --- /dev/null +++ b/utils/refchains-report-multi.py @@ -0,0 +1,254 @@ +#!/usr/bin/env python3 +"""Renders sweep-refchains-all.sh's combined (knob,param_value,) CSV +into a single self-contained HTML report: one tab per knob, one Chart.js line +chart per metric within each tab. Chart.js is vendored under utils/vendor and +inlined directly into the report so it opens standalone, offline, from the +sweep's temp working directory (no CDN dependency at view time). +""" +import argparse +import csv +import html +import json +import os + +ACCENT = "#2a78d6" # dataviz palette categorical slot 1 ("blue") - one series per chart, no legend needed +GRID = "#dedcd3" +TEXT_PRIMARY = "#0b0b0b" +TEXT_SECONDARY = "#52514e" +SURFACE = "#fcfcfb" + +HERE = os.path.dirname(os.path.abspath(__file__)) +CHARTJS_PATH = os.path.join(HERE, "vendor", "chart.umd.min.js") + +METRICS = [ + ("time_to_first_chain_s", "Time to first reference chain", "s", True), + ("chain_count", "Reference chains found", "count", False), + ("abandoned_count", "Searches abandoned", "count", True), + ("entries_per_sec", "Throughput", "entries/sec", False), + ("avg_round_ms", "Avg round latency", "ms", True), + ("max_round_ms", "Max round latency", "ms", True), + ("stw_total_s", "Total STW stop time", "s", True), + ("stw_max_s", "Longest single STW pause", "s", True), + ("heap_growth_mb", "Heap growth", "MB", True), + ("peak_rss_kb", "Peak RSS", "KB", True), +] + +# time_to_first_chain_s uses -1 as a sentinel for "no chain found within the +# run's duration" (see refchains-jfr-metrics.py) - never plot that as a +# real value, and never let it participate in the min/max Y bounds. +NOT_FOUND_SENTINEL = -1.0 + + +def fnum(s): + try: + return float(s) + except (TypeError, ValueError): + return 0.0 + + +def main(): + ap = argparse.ArgumentParser() + ap.add_argument("csv_path") + ap.add_argument("html_path") + ap.add_argument("--jdk", default="") + ap.add_argument("--gc", default="") + ap.add_argument("--duration", default="") + args = ap.parse_args() + + with open(args.csv_path, newline="") as f: + rows = list(csv.DictReader(f)) + + knobs = [] + for r in rows: + if r["knob"] not in knobs: + knobs.append(r["knob"]) + + with open(CHARTJS_PATH) as f: + chartjs_src = f.read() + + tabs_nav = [] + tabs_content = [] + chart_configs = [] # list of (canvas_id, config_dict) + + for ti, knob in enumerate(knobs): + knob_rows = [r for r in rows if r["knob"] == knob] + active = "active" if ti == 0 else "" + tabs_nav.append( + f'' + ) + + xs_raw = [r["param_value"] for r in knob_rows] + xs_num = [fnum(v) for v in xs_raw] + use_log = min(xs_num) > 0 and (max(xs_num) / min(xs_num) >= 10) + + cards = [] + for field, title, unit, higher_is_worse in METRICS: + canvas_id = f"chart-{knob}-{field}" + raw_ys = [fnum(r[field]) for r in knob_rows] + if field == "time_to_first_chain_s": + not_found = sum(1 for y in raw_ys if y == NOT_FOUND_SENTINEL) + ys = [None if y == NOT_FOUND_SENTINEL else y for y in raw_ys] + badge = ( + f'{not_found}/{len(raw_ys)} runs never found a chain' + if not_found else "" + ) + else: + ys = raw_ys + badge = "" + note = "higher is worse" if higher_is_worse else "" + cards.append(f''' +

    +

    {title} ({unit}{', ' + note if note else ''}) {badge}

    +
    +
    ''') + + config = { + "type": "line", + "data": { + "labels": xs_raw, + "datasets": [{ + "label": title, + "data": ys, + "borderColor": ACCENT, + "backgroundColor": ACCENT, + "borderWidth": 2, + "pointRadius": 4, + "pointHoverRadius": 6, + "tension": 0, + "fill": False, + "spanGaps": False, + }], + }, + "options": { + "responsive": True, + "maintainAspectRatio": False, + "plugins": { + "legend": {"display": False}, + "tooltip": { + "callbacks": {}, + "backgroundColor": "#1a1a19", + "titleColor": "#ffffff", + "bodyColor": "#ffffff", + }, + }, + "scales": { + "x": { + "type": "logarithmic" if use_log else "linear", + "title": {"display": True, "text": knob + (" (log scale)" if use_log else "")}, + "grid": {"color": GRID}, + "ticks": {"color": TEXT_SECONDARY}, + }, + "y": { + "title": {"display": True, "text": unit}, + "grid": {"color": GRID}, + "ticks": {"color": TEXT_SECONDARY}, + "beginAtZero": True, + }, + }, + }, + } + chart_configs.append((canvas_id, config, xs_num if use_log else None)) + + tabs_content.append(f''' +
    +
    {"".join(cards)}
    +
    ''') + + table_header = "".join(f"{html.escape(str(k))}" for k in rows[0]) if rows else "" + table_rows = "\n".join( + "" + "".join(f"{html.escape(str(r[k]))}" for k in r) + "" for r in rows + ) + + # Chart.js logarithmic scale needs numeric x values, not category labels - + # use a scatter-with-lines dataset (x/y pairs) instead of the labels array + # for any knob using log scale, since category+log axis isn't supported. + js_chart_inits = [] + for canvas_id, config, xs_num in chart_configs: + if xs_num is not None: + ys = config["data"]["datasets"][0]["data"] + config["data"]["datasets"][0]["data"] = [{"x": x, "y": y} for x, y in zip(xs_num, ys)] + del config["data"]["labels"] + js_chart_inits.append( + f'new Chart(document.getElementById("{canvas_id}"), {json.dumps(config)});' + ) + + out = f""" + + + +reference-chains OFAT budget-knob sweep + + + +

    reference-chains OFAT budget-knob sweep

    +
    JDK: {html.escape(str(args.jdk))}  |  GC: {html.escape(str(args.gc))}  |  duration/point: {html.escape(str(args.duration))}s  |  one-factor-at-a-time: each knob swept independently, others left at their built-in defaults
    +
    {"".join(tabs_nav)}
    +{"".join(tabs_content)} +
    + Raw data ({len(rows)} runs) + + {table_header} + {table_rows} +
    +
    + + + +""" + + with open(args.html_path, "w") as f: + f.write(out) + + +if __name__ == "__main__": + main() diff --git a/utils/refchains-report.py b/utils/refchains-report.py new file mode 100644 index 0000000000..3f7cf3e0a3 --- /dev/null +++ b/utils/refchains-report.py @@ -0,0 +1,231 @@ +#!/usr/bin/env python3 +"""Renders sweep-refchains-budgets.sh's CSV into a self-contained HTML report +with one line chart per metric (param value on x, metric on y). No external +JS/CSS dependencies - everything (SVG chart bodies, tooltip behavior) is +inlined so the report opens standalone from the sweep's temp working dir. +""" +import argparse +import csv +import html +import sys + +ACCENT = "#2a78d6" # dataviz palette categorical slot 1 ("blue") - single series, no legend needed +GRID = "#dedcd3" +TEXT_PRIMARY = "#0b0b0b" +TEXT_SECONDARY = "#52514e" +SURFACE = "#fcfcfb" + +CHARTS = [ + ("entries_per_sec", "Throughput", "entries/sec", False), + ("avg_round_ms", "Avg round latency", "ms", False), + ("max_round_ms", "Max round latency", "ms", False), + ("stw_total_s", "Total STW stop time", "s", False), + ("stw_max_s", "Longest single STW pause", "s", False), + ("heap_growth_mb", "Heap growth", "MB", True), + ("peak_rss_kb", "Peak RSS", "KB", False), +] + +CHART_W, CHART_H = 640, 260 +MARGIN_L, MARGIN_R, MARGIN_T, MARGIN_B = 56, 24, 20, 32 + + +def fnum(s): + try: + return float(s) + except (TypeError, ValueError): + # Coercing an unparsable CSV cell to 0.0 lets the chart render + # instead of crashing, but a silent 0.0 looks like a real + # measurement - flag it so a malformed sweep row doesn't masquerade + # as a genuine zero data point. + print(f"warning: could not parse {s!r} as a number, using 0.0", file=sys.stderr) + return 0.0 + + +def render_chart(rows, field, title, unit): + xs = [fnum(r["param_value"]) for r in rows] + ys = [fnum(r[field]) for r in rows] + plot_w = CHART_W - MARGIN_L - MARGIN_R + plot_h = CHART_H - MARGIN_T - MARGIN_B + + # Budget-style sweep values are usually log-spaced (1000, 10000, 100000, ...). + # A linear x-scale collapses all but the top value into the left few + # pixels, so switch to log scale whenever the sweep spans more than a + # decade and every value is positive. + use_log_x = min(xs) > 0 and (max(xs) / min(xs) >= 10) + x_min, x_max = min(xs), max(xs) + y_min, y_max = min(0.0, min(ys)), max(ys) if ys else 1.0 + if y_max == y_min: + y_max = y_min + 1.0 + if x_max == x_min: + x_max = x_min + 1.0 + + def px(x): + if use_log_x: + import math + lo, hi, v = math.log10(x_min), math.log10(x_max), math.log10(x) + return MARGIN_L + (v - lo) / (hi - lo) * plot_w + return MARGIN_L + (x - x_min) / (x_max - x_min) * plot_w + + def py(y): + return MARGIN_T + plot_h - (y - y_min) / (y_max - y_min) * plot_h + + points = [(px(x), py(y)) for x, y in zip(xs, ys)] + path_d = "M " + " L ".join(f"{x:.1f},{y:.1f}" for x, y in points) + + # 4 recessive horizontal gridlines with y-axis value labels. + gridlines = [] + for i in range(5): + gy = MARGIN_T + plot_h * i / 4 + gval = y_max - (y_max - y_min) * i / 4 + gridlines.append( + f'' + f'{gval:.3g}' + ) + + x_labels = [] + for x, r in zip(xs, rows): + x_labels.append( + f'{r["param_value"]}' + ) + + markers = [] + for i, ((x, y), r) in enumerate(zip(points, rows)): + val = fnum(r[field]) + markers.append( + f'' + ) + + x_scale_note = ( + f'x: log scale' + if use_log_x else "" + ) + + svg = f''' + + {"".join(gridlines)} + + {"".join(markers)} + {"".join(x_labels)} + {x_scale_note} +''' + return svg + + +def main(): + ap = argparse.ArgumentParser() + ap.add_argument("csv_path") + ap.add_argument("html_path") + ap.add_argument("--param", default="budget") + ap.add_argument("--jdk", default="") + ap.add_argument("--gc", default="") + ap.add_argument("--duration", default="") + args = ap.parse_args() + + with open(args.csv_path, newline="") as f: + rows = list(csv.DictReader(f)) + + chart_sections = [] + for field, title, unit, higher_is_worse in CHARTS: + note = "higher is worse" if higher_is_worse else "" + svg = render_chart(rows, field, title, unit) + chart_sections.append(f""" +
    +

    {html.escape(title)} ({html.escape(unit)}{', ' + note if note else ''})

    +
    {svg}
    +
    """) + + table_rows = "\n".join( + "" + "".join(f"{html.escape(r[k])}" for k in r) + "" for r in rows + ) + table_header = "".join(f"{html.escape(k)}" for k in rows[0]) if rows else "" + + out = f""" + + + +reference-chains budget sweep — {html.escape(args.param)} + + + +

    reference-chains budget sweep — {html.escape(args.param)}

    +
    JDK: {html.escape(args.jdk)}  |  GC: {html.escape(args.gc)}  |  duration/point: {html.escape(str(args.duration))}s  |  x-axis: {html.escape(args.param)} value
    +
    +{"".join(chart_sections)} +
    + +{table_header} + +{table_rows} + +
    +
    + + +""" + + with open(args.html_path, "w") as f: + f.write(out) + + +if __name__ == "__main__": + main() diff --git a/utils/run-chaos-harness.sh b/utils/run-chaos-harness.sh index b1a62139c7..8c12b905c0 100755 --- a/utils/run-chaos-harness.sh +++ b/utils/run-chaos-harness.sh @@ -177,16 +177,31 @@ case $ALLOCATOR in if [ -n "${GLIBC_VERSION}" ] && [ "$(printf '%s\n' "2.34" "${GLIBC_VERSION}" | sort -V | head -1)" = "2.34" ]; then MALLOC_DEBUG_LIB=$(find /usr/lib/ /usr/lib64/ /lib/ /lib64/ -maxdepth 4 -name 'libc_malloc_debug.so*' 2>/dev/null | head -1) if [ -z "${MALLOC_DEBUG_LIB}" ]; then - echo "FAIL:glibc ${GLIBC_VERSION} requires libc_malloc_debug to be preloaded for MALLOC_CHECK_ to take effect, but it could not be found" >&2 + # Fatal, matching tcmalloc/jemalloc's own missing-library handling + # below: ALLOCATOR=gmalloc is an explicit test variant in the + # scheduled chaos matrix specifically to exercise MALLOC_CHECK_'s + # heap-corruption detection, and the CI caller recognizes failure + # by grepping stderr for "FAIL:". Silently downgrading this to a + # WARN would let the job report success while never actually + # performing the corruption checking this variant promises (glibc + # >= 2.34's MALLOC_CHECK_ is a silent no-op without + # libc_malloc_debug preloaded). + echo "FAIL: glibc ${GLIBC_VERSION} requires libc_malloc_debug to be preloaded for MALLOC_CHECK_ to take effect, but it could not be found" >&2 exit 1 + else + export LD_PRELOAD="${MALLOC_DEBUG_LIB}${LD_PRELOAD:+:${LD_PRELOAD}}" + echo "glibc ${GLIBC_VERSION} detected — preloading ${MALLOC_DEBUG_LIB} for MALLOC_CHECK_" fi - export LD_PRELOAD="${MALLOC_DEBUG_LIB}${LD_PRELOAD:+:${LD_PRELOAD}}" - echo "glibc ${GLIBC_VERSION} detected — preloading ${MALLOC_DEBUG_LIB} for MALLOC_CHECK_" fi fi ;; tcmalloc) - export LD_PRELOAD=$(find /usr/lib/ /usr/lib64/ /opt/homebrew/lib/ /usr/local/lib/ -maxdepth 4 -name 'libtcmalloc_minimal.so.4' -o -name 'libtcmalloc.dylib' 2>/dev/null | head -1) + TCMALLOC_LIB=$(find /usr/lib/ /usr/lib64/ /opt/homebrew/lib/ /usr/local/lib/ -maxdepth 4 -name 'libtcmalloc_minimal.so.4' -o -name 'libtcmalloc.dylib' 2>/dev/null | head -1) + if [ -z "${TCMALLOC_LIB}" ]; then + echo "FAIL: allocator=tcmalloc requested but libtcmalloc_minimal.so.4/libtcmalloc.dylib could not be found" >&2 + exit 1 + fi + export LD_PRELOAD="${TCMALLOC_LIB}" # thread-churn/dump-storm antagonists cycle many short-lived threads; # tcmalloc's defaults are slow to return their per-thread caches to the # OS, which was inflating container RSS past the OOM limit on aarch64. @@ -194,7 +209,12 @@ case $ALLOCATOR in export TCMALLOC_AGGRESSIVE_DECOMMIT=1 ;; jemalloc) - export LD_PRELOAD=$(find /usr/lib/ /usr/lib64/ /opt/homebrew/lib/ /usr/local/lib/ -maxdepth 4 -name 'libjemalloc.so' -o -name 'libjemalloc.dylib' 2>/dev/null | head -1) + JEMALLOC_LIB=$(find /usr/lib/ /usr/lib64/ /opt/homebrew/lib/ /usr/local/lib/ -maxdepth 4 -name 'libjemalloc.so' -o -name 'libjemalloc.dylib' 2>/dev/null | head -1) + if [ -z "${JEMALLOC_LIB}" ]; then + echo "FAIL: allocator=jemalloc requested but libjemalloc.so/libjemalloc.dylib could not be found" >&2 + exit 1 + fi + export LD_PRELOAD="${JEMALLOC_LIB}" # Same aarch64 RSS-inflation issue as tcmalloc above: jemalloc's default # decay times leave dirty/muzzy pages resident under heavy thread churn. export MALLOC_CONF="background_thread:true,dirty_decay_ms:1000,muzzy_decay_ms:1000" @@ -247,7 +267,7 @@ echo "disk usage ($(dirname "${DDPROF_ROOT}")): $(df -h "$(dirname "${DDPROF_ROO # OOME instead, so a failure is a single, diagnosable event. CHAOS_START=$(date +%s) timeout "$((RUNTIME + 300))" \ -java -javaagent:${PATCHED_AGENT} \ +java -javaagent:"${PATCHED_AGENT}" \ --add-opens java.base/java.lang=ALL-UNNAMED \ ${ENABLEMENT} \ -Ddd.profiling.upload.period=10 \ @@ -261,11 +281,11 @@ java -javaagent:${PATCHED_AGENT} \ -Xmx${HEAP_MB}m -Xms${HEAP_MB}m \ -XX:MaxMetaspaceSize=384m \ -XX:NativeMemoryTracking=summary \ - -XX:ErrorFile=${HS_ERR} \ + -XX:ErrorFile="${HS_ERR}" \ -XX:+ExitOnOutOfMemoryError \ - -jar ${CHAOS_JAR} \ + -jar "${CHAOS_JAR}" \ --duration ${RUNTIME}s \ - --antagonists ${ANTAGONISTS} + --antagonists "${ANTAGONISTS}" RC=$? CHAOS_ELAPSED=$(( $(date +%s) - CHAOS_START )) diff --git a/utils/run-refchains-repro.sh b/utils/run-refchains-repro.sh new file mode 100755 index 0000000000..1425bd9ef0 --- /dev/null +++ b/utils/run-refchains-repro.sh @@ -0,0 +1,136 @@ +#!/usr/bin/env bash +# +# Runs the standalone reference-chains repro app (ddprof-stresstest/src/repro) +# with -agentpath and a set of referencechains sub-options known to actually +# reach the app's leaking CachedEntry population - see ReferenceChainLeakDemo's +# own class comment for why the tracker's auto-scaled first-pass budget +# (referenceChains.h's AUTO_FIRST_PASS_BUDGET_MULTIPLIER/_CAP) matters here. +# +# The jar takes the JFR output path as its own arg and periodically calls +# JavaProfiler.dump() on it - also load-bearing, per ReferenceChainLeakDemo's +# comment: without a dump() call nothing ever drains the tracker's pending +# chain-event queue, so datadog.ReferenceChain never actually lands in the file. +# +# Usage: run-refchains-repro.sh [jfr-output-path] [duration-seconds] +# +# duration-seconds (optional) bounds the run and makes the app print a single +# "[metrics]" summary line (throughput/round-latency/heap growth) at exit +# instead of running forever - see ReferenceChainLeakDemo.reportMetrics(). Also +# enables -Xlog safepoint+GC logging to .safepoint.log and +# .gc.log for STW-pause analysis. Used by compare-refchains-repro.sh to A/B +# referencechains=true vs. false over an identical bounded window. +# +# Env vars: +# REFCHAINS_SO path to libjavaProfiler.so/.dylib (default: locate the +# locally built debug artifact under ddprof-lib/build/lib) +# REFCHAINS_JAR path to refchains_repro.jar (default: build/rebuild via +# ./gradlew :ddprof-stresstest:reproJar) +# REFCHAINS_ENABLED "true" (default) or "false" - toggles the +# referencechains=... agent sub-option itself, for A/B +# comparison against a baseline with the feature off. +# REFCHAINS_ARGS extra referencechains=... sub-options appended after the +# baked-in defaults below (e.g. "hops=32") +# REFCHAINS_JAVA_HOME JDK home to launch the repro with (default: "java" on +# PATH). Lets you A/B a specific JDK, e.g. to reproduce a +# version-specific VMStructs bug: REFCHAINS_JAVA_HOME=/usr/local/sdkman/candidates/java/25.0.3-tem +# REFCHAINS_GC GC to force via -XX:+UseGC (default: JVM's own +# ergonomic default - no flag added). Accepts either the +# bare name ("Serial", "G1", "Parallel", "Shenandoah", +# "Z", "Epsilon") or the full flag name ("SerialGC"). +# e.g. REFCHAINS_GC=Serial or REFCHAINS_GC=ZGC + +set -euo pipefail + +HERE="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )" +ROOT="$( cd "${HERE}/.." >/dev/null 2>&1 && pwd )" + +JFR_OUT="${1:-/tmp/refchains_repro.jfr}" +DURATION_SECONDS="${2:-}" + +JAVA_BIN="java" +if [ -n "${REFCHAINS_JAVA_HOME:-}" ]; then + JAVA_BIN="${REFCHAINS_JAVA_HOME}/bin/java" + if [ ! -x "${JAVA_BIN}" ]; then + echo "FAIL: ${JAVA_BIN} not found/executable - check REFCHAINS_JAVA_HOME" >&2 + exit 1 + fi +fi +echo "Using JDK: $("${JAVA_BIN}" -version 2>&1 | head -1)" + +GC_JVM_OPTS=() +if [ -n "${REFCHAINS_GC:-}" ]; then + case "${REFCHAINS_GC}" in + *GC) GC_FLAG="-XX:+Use${REFCHAINS_GC}" ;; + *) GC_FLAG="-XX:+Use${REFCHAINS_GC}GC" ;; + esac + GC_JVM_OPTS=("${GC_FLAG}") + echo "Forcing GC: ${GC_FLAG}" +else + echo "GC: JVM ergonomic default" +fi + +if [ -z "${REFCHAINS_SO:-}" ]; then + # Prefer the debug artifact: this repro is built with `assembleDebug`, and a + # stale `release/` build left over from an earlier `assembleAll` sits under + # the same build/lib tree. A bare find|head -1 picks whichever the directory + # walk hits first (observed: release), silently running the OLD binary and + # making source edits appear to have no effect - so match debug/ first and + # only fall back to any build if no debug artifact exists. + REFCHAINS_SO=$(find "${ROOT}/ddprof-lib/build/lib" \ + \( -name 'libjavaProfiler.so' -o -name 'libjavaProfiler.dylib' \) \ + -path '*/debug/*' 2>/dev/null | head -1) + if [ -z "${REFCHAINS_SO}" ]; then + REFCHAINS_SO=$(find "${ROOT}/ddprof-lib/build/lib" \ + \( -name 'libjavaProfiler.so' -o -name 'libjavaProfiler.dylib' \) \ + 2>/dev/null | head -1) + fi +fi +if [ -z "${REFCHAINS_SO}" ] || [ ! -f "${REFCHAINS_SO}" ]; then + echo "FAIL:libjavaProfiler.so/.dylib not found - build one first: ./gradlew :ddprof-lib:debugSharedLibrary" >&2 + exit 1 +fi +echo "Using agent: ${REFCHAINS_SO}" + +if [ -z "${REFCHAINS_JAR:-}" ]; then + REFCHAINS_JAR="${ROOT}/ddprof-stresstest/build/libs/refchains_repro.jar" + if [ ! -f "${REFCHAINS_JAR}" ]; then + echo "refchains_repro.jar not present - building it" + ( cd "${ROOT}" && ./gradlew :ddprof-stresstest:reproJar -q --no-daemon ) + fi +fi +if [ ! -f "${REFCHAINS_JAR}" ]; then + echo "FAIL:refchains_repro.jar unavailable" >&2 + exit 1 +fi +echo "Using jar: ${REFCHAINS_JAR}" + +# No firstpassbudget here: the tracker auto-scales the first pass's budget +# from budget=4000 (currently x50, capped at 200000 - referenceChains.h) so +# it can actually reach this app's leaking population. Pass +# REFCHAINS_ARGS="firstpassbudget=N" to override that auto-scaled default. +REFCHAINS_ENABLED="${REFCHAINS_ENABLED:-true}" +REFERENCECHAINS_OPTS="${REFCHAINS_ENABLED}:hops=64:budget=10000:ttl=120000:framecap=2000000:pausetarget=500:painbudget=100" +if [ -n "${REFCHAINS_ARGS:-}" ]; then + REFERENCECHAINS_OPTS="${REFERENCECHAINS_OPTS}:${REFCHAINS_ARGS}" +fi + +echo "JFR output: ${JFR_OUT}" +echo "referencechains enabled: ${REFCHAINS_ENABLED}" +rm -f "${JFR_OUT}" + +JAVA_LOG_OPTS=() +if [ -n "${DURATION_SECONDS}" ]; then + # Unified-logging safepoint+GC pause detail, kept per-run alongside the JFR file so + # compare-refchains-repro.sh can parse "Total time for which application threads were + # stopped" (STW safepoint pauses, includes GC) and per-GC pause times out of one file. + SAFEPOINT_LOG="${JFR_OUT}.safepoint.log" + rm -f "${SAFEPOINT_LOG}" + JAVA_LOG_OPTS=(-Xlog:safepoint*=info,gc*=info:file="${SAFEPOINT_LOG}":time,uptime,level,tags) + echo "Safepoint/GC log: ${SAFEPOINT_LOG}" +fi + +exec "${JAVA_BIN}" \ + "${JAVA_LOG_OPTS[@]}" \ + "${GC_JVM_OPTS[@]}" \ + -agentpath:"${REFCHAINS_SO}"=start,memory=64:l,generations=true,referencechains=${REFERENCECHAINS_OPTS},jfr,file="${JFR_OUT}" \ + -jar "${REFCHAINS_JAR}" "${JFR_OUT}" "${REFCHAINS_SO}" ${DURATION_SECONDS} diff --git a/utils/sweep-refchains-all.sh b/utils/sweep-refchains-all.sh new file mode 100644 index 0000000000..76cd7b7f73 --- /dev/null +++ b/utils/sweep-refchains-all.sh @@ -0,0 +1,149 @@ +#!/usr/bin/env bash +# +# One-factor-at-a-time (OFAT) sweep across all four referencechains budget +# knobs (budget, firstpassbudget, pausetarget, painbudget): for each knob, +# sweeps its own value list while holding the other three at their built-in +# defaults (i.e. omitted from the sub-option string, letting the tracker's +# own defaults/auto-scaling apply - see referenceChains.h). A full cartesian +# product across all four knobs is combinatorially far more runs for little +# extra insight over OFAT at this stage, so this is deliberately OFAT, not a +# grid search. +# +# Writes one combined CSV (knob,param_value,) covering all four +# sweeps, then renders it via refchains-report-multi.py into a single +# Chart.js-based HTML report with one tab per knob. +# +# Usage: sweep-refchains-all.sh [duration-seconds] +# +# Env vars: +# REFCHAINS_SO/REFCHAINS_JAR/REFCHAINS_JAVA_HOME/REFCHAINS_GC same as +# run-refchains-repro.sh - passed through unchanged +# to every run so all sweeps stay comparable. +# REFCHAINS_ARGS extra referencechains=... sub-options held fixed +# across every run (in addition to the defaults +# baked into run-refchains-repro.sh). + +set -euo pipefail + +HERE="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )" + +DURATION_SECONDS="${1:-60}" + +KNOBS=(budget firstpassbudget pausetarget painbudget) +declare -A KNOB_VALUES=( + [budget]="${REFCHAINS_SWEEP_BUDGET_VALUES:-1000,4000,10000,40000,100000}" + [firstpassbudget]="${REFCHAINS_SWEEP_FIRSTPASSBUDGET_VALUES:-2000,10000,50000,200000}" + [pausetarget]="${REFCHAINS_SWEEP_PAUSETARGET_VALUES:-50,100,250,500,1000}" + [painbudget]="${REFCHAINS_SWEEP_PAINBUDGET_VALUES:-10,50,100,500,1000}" +) + +WORKDIR="$(mktemp -d /tmp/refchains_sweep_all.XXXXXX)" +CSV="${WORKDIR}/sweep.csv" + +JDK_DESC="${REFCHAINS_JAVA_HOME:-java on PATH}" +GC_DESC="${REFCHAINS_GC:-JVM ergonomic default}" + +TOTAL_RUNS=0 +for k in "${KNOBS[@]}"; do + IFS=',' read -r -a vals <<< "${KNOB_VALUES[${k}]}" + TOTAL_RUNS=$((TOTAL_RUNS + ${#vals[@]})) +done + +echo "OFAT sweep across knobs: ${KNOBS[*]}" +echo "JDK: ${JDK_DESC}" +echo "GC: ${GC_DESC}" +echo "Duration per point: ${DURATION_SECONDS}s, total runs: ${TOTAL_RUNS} (~$((TOTAL_RUNS * DURATION_SECONDS / 60)) min)" +echo "Working directory: ${WORKDIR}" + +echo "knob,param_value,entries_per_sec,avg_round_ms,max_round_ms,heap_growth_mb,stw_count,stw_total_s,stw_avg_s,stw_max_s,peak_rss_kb,wall_seconds,chain_count,abandoned_count,time_to_first_chain_s" > "${CSV}" + +# Same metrics extraction as sweep-refchains-budgets.sh/compare-refchains-repro.sh - +# kept in sync across all three since they read the same stdout/-Xlog sources. +parse_run() { + local label="$1" + local stdout="${WORKDIR}/${label}.stdout.log" + local safepoint_log="${WORKDIR}/${label}.jfr.safepoint.log" + local peak_rss_kb + peak_rss_kb=$(cat "${WORKDIR}/${label}.peak_rss_kb" 2>/dev/null || echo 0) + + local metrics_line + metrics_line=$(grep '^\[metrics\]' "${stdout}" || true) + local wall_seconds entries_per_sec avg_round_ms max_round_ms heap_growth_mb + wall_seconds=$(echo "${metrics_line}" | grep -oE 'wallSeconds=[0-9.]+' | cut -d= -f2) + entries_per_sec=$(echo "${metrics_line}" | grep -oE 'entriesPerSec=[0-9.]+' | cut -d= -f2) + avg_round_ms=$(echo "${metrics_line}" | grep -oE 'avgRoundMs=[0-9.]+' | cut -d= -f2) + max_round_ms=$(echo "${metrics_line}" | grep -oE 'maxRoundMs=[0-9.]+' | cut -d= -f2) + heap_growth_mb=$(echo "${metrics_line}" | grep -oE 'heapGrowthMb=-?[0-9]+' | cut -d= -f2) + + local stw_stats + stw_stats=$(grep -oE 'Safepoint "[^"]+".*Total: [0-9]+ ns' "${safepoint_log}" 2>/dev/null \ + | grep -oE 'Total: [0-9]+ ns' \ + | grep -oE '[0-9]+' \ + | awk '{sec=$1/1e9; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + if [ -z "${stw_stats}" ]; then + stw_stats=$(grep -oE 'Total time for which application threads were stopped: [0-9.]+ seconds' "${safepoint_log}" 2>/dev/null \ + | grep -oE '[0-9.]+' \ + | awk '{sec=$1; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + fi + read -r stw_count stw_total stw_avg stw_max <<< "${stw_stats:-0 0 0 0}" + + # jfr print/summary require a ".jfr" extension - the repro app's periodic + # dump target (".snapshot", see ReferenceChainLeakDemo's own header + # comment on SNAPSHOT_SUFFIX) doesn't have one, so copy it under a .jfr + # name before handing it to refchains-jfr-metrics.py. + local snapshot="${WORKDIR}/${label}.jfr.snapshot" + local chain_count=0 abandoned_count=0 time_to_first_chain_s=-1 + if [ -f "${snapshot}" ]; then + local tmp_jfr="${WORKDIR}/${label}.metrics.jfr" + cp "${snapshot}" "${tmp_jfr}" + local chain_stats + chain_stats=$(python3 "${HERE}/refchains-jfr-metrics.py" "${tmp_jfr}" 2>/dev/null || echo "0 0 -1") + read -r chain_count abandoned_count time_to_first_chain_s <<< "${chain_stats}" + rm -f "${tmp_jfr}" + fi + + echo "${entries_per_sec:-0} ${avg_round_ms:-0} ${max_round_ms:-0} ${heap_growth_mb:-0} ${stw_count} ${stw_total} ${stw_avg} ${stw_max} ${peak_rss_kb} ${wall_seconds:-0} ${chain_count} ${abandoned_count} ${time_to_first_chain_s}" +} + +run_idx=0 +for knob in "${KNOBS[@]}"; do + IFS=',' read -r -a vals <<< "${KNOB_VALUES[${knob}]}" + for value in "${vals[@]}"; do + run_idx=$((run_idx + 1)) + label="${knob}_${value}" + jfr="${WORKDIR}/${label}.jfr" + echo + echo "=== [${run_idx}/${TOTAL_RUNS}] ${knob}=${value} ===" + + REFCHAINS_ENABLED="true" REFCHAINS_ARGS="${knob}=${value}${REFCHAINS_ARGS:+:${REFCHAINS_ARGS}}" \ + "${HERE}/run-refchains-repro.sh" "${jfr}" "${DURATION_SECONDS}" \ + > "${WORKDIR}/${label}.stdout.log" 2>&1 & + pid=$! + + peak_rss_kb=0 + while kill -0 "${pid}" 2>/dev/null; do + rss=$(ps -o rss= -p "${pid}" 2>/dev/null | tr -d ' ' || true) + if [ -n "${rss}" ] && [ "${rss}" -gt "${peak_rss_kb}" ]; then + peak_rss_kb="${rss}" + fi + sleep 1 + done + wait "${pid}" || echo "WARN: run ${knob}=${value} exited non-zero" + echo "${peak_rss_kb}" > "${WORKDIR}/${label}.peak_rss_kb" + + read -r entries avg_round max_round heap_growth stw_count stw_total stw_avg stw_max rss wall \ + chain_count abandoned_count time_to_first_chain \ + <<< "$(parse_run "${label}")" + echo "${knob},${value},${entries},${avg_round},${max_round},${heap_growth},${stw_count},${stw_total},${stw_avg},${stw_max},${rss},${wall},${chain_count},${abandoned_count},${time_to_first_chain}" >> "${CSV}" + done +done + +echo +echo "CSV written to: ${CSV}" + +REPORT_HTML="${WORKDIR}/report.html" +python3 "${HERE}/refchains-report-multi.py" "${CSV}" "${REPORT_HTML}" \ + --jdk "${JDK_DESC}" --gc "${GC_DESC}" --duration "${DURATION_SECONDS}" + +echo "HTML report written to: ${REPORT_HTML}" +echo "Raw logs kept in: ${WORKDIR}" diff --git a/utils/sweep-refchains-budgets.sh b/utils/sweep-refchains-budgets.sh new file mode 100644 index 0000000000..1d795fb6e5 --- /dev/null +++ b/utils/sweep-refchains-budgets.sh @@ -0,0 +1,139 @@ +#!/usr/bin/env bash +# +# Sweeps referencechains=... budget-related sub-options (budget, +# firstpassbudget, pausetarget, painbudget) across a matrix of values and +# runs the repro app (run-refchains-repro.sh) once per combination, to +# answer: how does each budget knob trade off throughput/round-latency, +# STW pause time, and heap/RSS growth? +# +# This is the multi-point sibling of compare-refchains-repro.sh (which only +# ever does one on/off comparison at a single fixed set of sub-options). +# Reuses the same repro app and the same metric sources (stdout +# "[metrics]" line + -Xlog safepoint/GC log + peak RSS sampling), but drives +# N runs instead of 2 and writes them to a CSV plus a self-contained HTML +# report with charts (see refchains-report.py). +# +# Usage: sweep-refchains-budgets.sh [duration-seconds] +# +# Env vars: +# REFCHAINS_SWEEP_PARAM which sub-option to sweep: "budget" (default), +# "firstpassbudget", "pausetarget", or "painbudget". +# REFCHAINS_SWEEP_VALUES comma-separated values for that sub-option +# (default depends on REFCHAINS_SWEEP_PARAM - see +# below). +# REFCHAINS_SO/REFCHAINS_JAR/REFCHAINS_JAVA_HOME/REFCHAINS_GC same as +# run-refchains-repro.sh - passed through unchanged +# to every run so they stay comparable. +# REFCHAINS_ARGS extra referencechains=... sub-options held fixed +# across the whole sweep (in addition to the +# defaults baked into run-refchains-repro.sh). + +set -euo pipefail + +HERE="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )" + +DURATION_SECONDS="${1:-120}" +SWEEP_PARAM="${REFCHAINS_SWEEP_PARAM:-budget}" + +case "${SWEEP_PARAM}" in + budget) DEFAULT_VALUES="1000,4000,10000,40000,100000" ;; + firstpassbudget) DEFAULT_VALUES="2000,10000,50000,200000" ;; + pausetarget) DEFAULT_VALUES="50,100,250,500,1000" ;; + painbudget) DEFAULT_VALUES="10,50,100,500,1000" ;; + *) + echo "FAIL: unknown REFCHAINS_SWEEP_PARAM=${SWEEP_PARAM} (expected: budget, firstpassbudget, pausetarget, painbudget)" >&2 + exit 1 + ;; +esac +IFS=',' read -r -a SWEEP_VALUES <<< "${REFCHAINS_SWEEP_VALUES:-${DEFAULT_VALUES}}" + +WORKDIR="$(mktemp -d /tmp/refchains_sweep.XXXXXX)" +CSV="${WORKDIR}/sweep.csv" + +JDK_DESC="${REFCHAINS_JAVA_HOME:-java on PATH}" +GC_DESC="${REFCHAINS_GC:-JVM ergonomic default}" + +echo "Sweeping referencechains ${SWEEP_PARAM} over: ${SWEEP_VALUES[*]}" +echo "JDK: ${JDK_DESC}" +echo "GC: ${GC_DESC}" +echo "Duration per point: ${DURATION_SECONDS}s" +echo "Working directory: ${WORKDIR}" + +echo "param_value,entries_per_sec,avg_round_ms,max_round_ms,heap_growth_mb,stw_count,stw_total_s,stw_avg_s,stw_max_s,peak_rss_kb,wall_seconds" > "${CSV}" + +# Parses one run's logs into a single space-separated metrics line - same +# fields/sources as compare-refchains-repro.sh's parse_variant, factored out +# here since this script iterates N runs instead of a fixed on/off pair. +parse_run() { + local label="$1" + local stdout="${WORKDIR}/${label}.stdout.log" + local safepoint_log="${WORKDIR}/${label}.jfr.safepoint.log" + local peak_rss_kb + peak_rss_kb=$(cat "${WORKDIR}/${label}.peak_rss_kb" 2>/dev/null || echo 0) + + local metrics_line + metrics_line=$(grep '^\[metrics\]' "${stdout}" || true) + local wall_seconds entries_per_sec avg_round_ms max_round_ms heap_growth_mb + wall_seconds=$(echo "${metrics_line}" | grep -oE 'wallSeconds=[0-9.]+' | cut -d= -f2) + entries_per_sec=$(echo "${metrics_line}" | grep -oE 'entriesPerSec=[0-9.]+' | cut -d= -f2) + avg_round_ms=$(echo "${metrics_line}" | grep -oE 'avgRoundMs=[0-9.]+' | cut -d= -f2) + max_round_ms=$(echo "${metrics_line}" | grep -oE 'maxRoundMs=[0-9.]+' | cut -d= -f2) + heap_growth_mb=$(echo "${metrics_line}" | grep -oE 'heapGrowthMb=-?[0-9]+' | cut -d= -f2) + + # Two -Xlog safepoint line shapes across JDK versions: + # - JDK 17+: `Safepoint "name", ... Total: N ns` (one line, everything on it) + # - JDK <=16 (e.g. 11): `Total time for which application threads were + # stopped: N seconds, Stopping threads took: ...` (separate summary line, + # no per-name "Safepoint" prefix, value already in seconds not ns) + # Try the ns-based JDK17+ shape first; fall back to the seconds-based one. + local stw_stats + stw_stats=$(grep -oE 'Safepoint "[^"]+".*Total: [0-9]+ ns' "${safepoint_log}" 2>/dev/null \ + | grep -oE 'Total: [0-9]+ ns' \ + | grep -oE '[0-9]+' \ + | awk '{sec=$1/1e9; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + if [ -z "${stw_stats}" ]; then + stw_stats=$(grep -oE 'Total time for which application threads were stopped: [0-9.]+ seconds' "${safepoint_log}" 2>/dev/null \ + | grep -oE '[0-9.]+' \ + | awk '{sec=$1; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + fi + read -r stw_count stw_total stw_avg stw_max <<< "${stw_stats:-0 0 0 0}" + + echo "${entries_per_sec:-0} ${avg_round_ms:-0} ${max_round_ms:-0} ${heap_growth_mb:-0} ${stw_count} ${stw_total} ${stw_avg} ${stw_max} ${peak_rss_kb} ${wall_seconds:-0}" +} + +for value in "${SWEEP_VALUES[@]}"; do + label="${SWEEP_PARAM}_${value}" + jfr="${WORKDIR}/${label}.jfr" + echo + echo "=== running ${SWEEP_PARAM}=${value} ===" + + REFCHAINS_ENABLED="true" REFCHAINS_ARGS="${SWEEP_PARAM}=${value}${REFCHAINS_ARGS:+:${REFCHAINS_ARGS}}" \ + "${HERE}/run-refchains-repro.sh" "${jfr}" "${DURATION_SECONDS}" \ + > "${WORKDIR}/${label}.stdout.log" 2>&1 & + pid=$! + + peak_rss_kb=0 + while kill -0 "${pid}" 2>/dev/null; do + rss=$(ps -o rss= -p "${pid}" 2>/dev/null | tr -d ' ' || true) + if [ -n "${rss}" ] && [ "${rss}" -gt "${peak_rss_kb}" ]; then + peak_rss_kb="${rss}" + fi + sleep 1 + done + wait "${pid}" || echo "WARN: run ${SWEEP_PARAM}=${value} exited non-zero" + echo "${peak_rss_kb}" > "${WORKDIR}/${label}.peak_rss_kb" + + read -r entries avg_round max_round heap_growth stw_count stw_total stw_avg stw_max rss wall \ + <<< "$(parse_run "${label}")" + echo "${value},${entries},${avg_round},${max_round},${heap_growth},${stw_count},${stw_total},${stw_avg},${stw_max},${rss},${wall}" >> "${CSV}" +done + +echo +echo "CSV written to: ${CSV}" + +REPORT_HTML="${WORKDIR}/report.html" +python3 "${HERE}/refchains-report.py" "${CSV}" "${REPORT_HTML}" \ + --param "${SWEEP_PARAM}" --jdk "${JDK_DESC}" --gc "${GC_DESC}" --duration "${DURATION_SECONDS}" + +echo "HTML report written to: ${REPORT_HTML}" +echo "Raw logs kept in: ${WORKDIR}" diff --git a/utils/vendor/chart.umd.min.js b/utils/vendor/chart.umd.min.js new file mode 100644 index 0000000000..008464faae --- /dev/null +++ b/utils/vendor/chart.umd.min.js @@ -0,0 +1,14 @@ +/*! + * Chart.js v4.5.1 + * https://www.chartjs.org + * (c) 2025 Chart.js Contributors + * Released under the MIT License + */ +!function(t,e){"object"==typeof exports&&"undefined"!=typeof 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o,a,r;for(o=0,a=t.length;o{s[t]=Math.max(e[t],i[t])})),s}return s(t?["left","right"]:["top","bottom"])}function os(t,e,i,s){const n=[];let o,a,r,l,h,c;for(o=0,a=t.length,h=0;ot.box.fullSize)),!0),s=Qi(Ji(e,"left"),!0),n=Qi(Ji(e,"right")),o=Qi(Ji(e,"top"),!0),a=Qi(Ji(e,"bottom")),r=Zi(e,"x"),l=Zi(e,"y");return{fullSize:i,leftAndTop:s.concat(o),rightAndBottom:n.concat(l).concat(a).concat(r),chartArea:Ji(e,"chartArea"),vertical:s.concat(n).concat(l),horizontal:o.concat(a).concat(r)}}(t.boxes),l=r.vertical,h=r.horizontal;u(t.boxes,(t=>{"function"==typeof t.beforeLayout&&t.beforeLayout()}));const c=l.reduce(((t,e)=>e.box.options&&!1===e.box.options.display?t:t+1),0)||1,d=Object.freeze({outerWidth:e,outerHeight:i,padding:n,availableWidth:o,availableHeight:a,vBoxMaxWidth:o/2/c,hBoxMaxHeight:a/2}),f=Object.assign({},n);is(f,ki(s));const g=Object.assign({maxPadding:f,w:o,h:a,x:n.left,y:n.top},n),p=ts(l.concat(h),d);os(r.fullSize,g,d,p),os(l,g,d,p),os(h,g,d,p)&&os(l,g,d,p),function(t){const e=t.maxPadding;function i(i){const s=Math.max(e[i]-t[i],0);return t[i]+=s,s}t.y+=i("top"),t.x+=i("left"),i("right"),i("bottom")}(g),rs(r.leftAndTop,g,d,p),g.x+=g.w,g.y+=g.h,rs(r.rightAndBottom,g,d,p),t.chartArea={left:g.left,top:g.top,right:g.left+g.w,bottom:g.top+g.h,height:g.h,width:g.w},u(r.chartArea,(e=>{const i=e.box;Object.assign(i,t.chartArea),i.update(g.w,g.h,{left:0,top:0,right:0,bottom:0})}))}};class hs{acquireContext(t,e){}releaseContext(t){return!1}addEventListener(t,e,i){}removeEventListener(t,e,i){}getDevicePixelRatio(){return 1}getMaximumSize(t,e,i,s){return e=Math.max(0,e||t.width),i=i||t.height,{width:e,height:Math.max(0,s?Math.floor(e/s):i)}}isAttached(t){return!0}updateConfig(t){}}class cs extends hs{acquireContext(t){return t&&t.getContext&&t.getContext("2d")||null}updateConfig(t){t.options.animation=!1}}const ds="$chartjs",us={touchstart:"mousedown",touchmove:"mousemove",touchend:"mouseup",pointerenter:"mouseenter",pointerdown:"mousedown",pointermove:"mousemove",pointerup:"mouseup",pointerleave:"mouseout",pointerout:"mouseout"},fs=t=>null===t||""===t;const gs=!!Se&&{passive:!0};function ps(t,e,i){t&&t.canvas&&t.canvas.removeEventListener(e,i,gs)}function ms(t,e){for(const i of t)if(i===e||i.contains(e))return!0}function xs(t,e,i){const s=t.canvas,n=new MutationObserver((t=>{let e=!1;for(const i of t)e=e||ms(i.addedNodes,s),e=e&&!ms(i.removedNodes,s);e&&i()}));return n.observe(document,{childList:!0,subtree:!0}),n}function bs(t,e,i){const s=t.canvas,n=new MutationObserver((t=>{let e=!1;for(const i of t)e=e||ms(i.removedNodes,s),e=e&&!ms(i.addedNodes,s);e&&i()}));return n.observe(document,{childList:!0,subtree:!0}),n}const _s=new Map;let ys=0;function vs(){const t=window.devicePixelRatio;t!==ys&&(ys=t,_s.forEach(((e,i)=>{i.currentDevicePixelRatio!==t&&e()})))}function Ms(t,e,i){const s=t.canvas,n=s&&ge(s);if(!n)return;const o=ct(((t,e)=>{const s=n.clientWidth;i(t,e),s{const e=t[0],i=e.contentRect.width,s=e.contentRect.height;0===i&&0===s||o(i,s)}));return a.observe(n),function(t,e){_s.size||window.addEventListener("resize",vs),_s.set(t,e)}(t,o),a}function ws(t,e,i){i&&i.disconnect(),"resize"===e&&function(t){_s.delete(t),_s.size||window.removeEventListener("resize",vs)}(t)}function ks(t,e,i){const s=t.canvas,n=ct((e=>{null!==t.ctx&&i(function(t,e){const i=us[t.type]||t.type,{x:s,y:n}=ve(t,e);return{type:i,chart:e,native:t,x:void 0!==s?s:null,y:void 0!==n?n:null}}(e,t))}),t);return function(t,e,i){t&&t.addEventListener(e,i,gs)}(s,e,n),n}class Ss extends hs{acquireContext(t,e){const i=t&&t.getContext&&t.getContext("2d");return i&&i.canvas===t?(function(t,e){const i=t.style,s=t.getAttribute("height"),n=t.getAttribute("width");if(t[ds]={initial:{height:s,width:n,style:{display:i.display,height:i.height,width:i.width}}},i.display=i.display||"block",i.boxSizing=i.boxSizing||"border-box",fs(n)){const e=Pe(t,"width");void 0!==e&&(t.width=e)}if(fs(s))if(""===t.style.height)t.height=t.width/(e||2);else{const e=Pe(t,"height");void 0!==e&&(t.height=e)}}(t,e),i):null}releaseContext(t){const e=t.canvas;if(!e[ds])return!1;const i=e[ds].initial;["height","width"].forEach((t=>{const n=i[t];s(n)?e.removeAttribute(t):e.setAttribute(t,n)}));const n=i.style||{};return Object.keys(n).forEach((t=>{e.style[t]=n[t]})),e.width=e.width,delete e[ds],!0}addEventListener(t,e,i){this.removeEventListener(t,e);const s=t.$proxies||(t.$proxies={}),n={attach:xs,detach:bs,resize:Ms}[e]||ks;s[e]=n(t,e,i)}removeEventListener(t,e){const i=t.$proxies||(t.$proxies={}),s=i[e];if(!s)return;({attach:ws,detach:ws,resize:ws}[e]||ps)(t,e,s),i[e]=void 0}getDevicePixelRatio(){return window.devicePixelRatio}getMaximumSize(t,e,i,s){return we(t,e,i,s)}isAttached(t){const e=t&&ge(t);return!(!e||!e.isConnected)}}function Ps(t){return!fe()||"undefined"!=typeof OffscreenCanvas&&t instanceof OffscreenCanvas?cs:Ss}var Ds=Object.freeze({__proto__:null,BasePlatform:hs,BasicPlatform:cs,DomPlatform:Ss,_detectPlatform:Ps});const Cs="transparent",Os={boolean:(t,e,i)=>i>.5?e:t,color(t,e,i){const s=Qt(t||Cs),n=s.valid&&Qt(e||Cs);return n&&n.valid?n.mix(s,i).hexString():e},number:(t,e,i)=>t+(e-t)*i};class As{constructor(t,e,i,s){const n=e[i];s=Pi([t.to,s,n,t.from]);const o=Pi([t.from,n,s]);this._active=!0,this._fn=t.fn||Os[t.type||typeof o],this._easing=fi[t.easing]||fi.linear,this._start=Math.floor(Date.now()+(t.delay||0)),this._duration=this._total=Math.floor(t.duration),this._loop=!!t.loop,this._target=e,this._prop=i,this._from=o,this._to=s,this._promises=void 0}active(){return this._active}update(t,e,i){if(this._active){this._notify(!1);const s=this._target[this._prop],n=i-this._start,o=this._duration-n;this._start=i,this._duration=Math.floor(Math.max(o,t.duration)),this._total+=n,this._loop=!!t.loop,this._to=Pi([t.to,e,s,t.from]),this._from=Pi([t.from,s,e])}}cancel(){this._active&&(this.tick(Date.now()),this._active=!1,this._notify(!1))}tick(t){const e=t-this._start,i=this._duration,s=this._prop,n=this._from,o=this._loop,a=this._to;let r;if(this._active=n!==a&&(o||e1?2-r:r,r=this._easing(Math.min(1,Math.max(0,r))),this._target[s]=this._fn(n,a,r))}wait(){const t=this._promises||(this._promises=[]);return new Promise(((e,i)=>{t.push({res:e,rej:i})}))}_notify(t){const e=t?"res":"rej",i=this._promises||[];for(let t=0;t{const a=t[s];if(!o(a))return;const r={};for(const t of e)r[t]=a[t];(n(a.properties)&&a.properties||[s]).forEach((t=>{t!==s&&i.has(t)||i.set(t,r)}))}))}_animateOptions(t,e){const i=e.options,s=function(t,e){if(!e)return;let i=t.options;if(!i)return void(t.options=e);i.$shared&&(t.options=i=Object.assign({},i,{$shared:!1,$animations:{}}));return i}(t,i);if(!s)return[];const n=this._createAnimations(s,i);return i.$shared&&function(t,e){const i=[],s=Object.keys(e);for(let e=0;e{t.options=i}),(()=>{})),n}_createAnimations(t,e){const i=this._properties,s=[],n=t.$animations||(t.$animations={}),o=Object.keys(e),a=Date.now();let r;for(r=o.length-1;r>=0;--r){const l=o[r];if("$"===l.charAt(0))continue;if("options"===l){s.push(...this._animateOptions(t,e));continue}const h=e[l];let c=n[l];const d=i.get(l);if(c){if(d&&c.active()){c.update(d,h,a);continue}c.cancel()}d&&d.duration?(n[l]=c=new As(d,t,l,h),s.push(c)):t[l]=h}return s}update(t,e){if(0===this._properties.size)return void Object.assign(t,e);const i=this._createAnimations(t,e);return i.length?(bt.add(this._chart,i),!0):void 0}}function Ls(t,e){const i=t&&t.options||{},s=i.reverse,n=void 0===i.min?e:0,o=void 0===i.max?e:0;return{start:s?o:n,end:s?n:o}}function Es(t,e){const i=[],s=t._getSortedDatasetMetas(e);let n,o;for(n=0,o=s.length;n0||!i&&e<0)return n.index}return null}function Vs(t,e){const{chart:i,_cachedMeta:s}=t,n=i._stacks||(i._stacks={}),{iScale:o,vScale:a,index:r}=s,l=o.axis,h=a.axis,c=function(t,e,i){return`${t.id}.${e.id}.${i.stack||i.type}`}(o,a,s),d=e.length;let u;for(let t=0;ti[t].axis===e)).shift()}function Ws(t,e){const i=t.controller.index,s=t.vScale&&t.vScale.axis;if(s){e=e||t._parsed;for(const t of e){const e=t._stacks;if(!e||void 0===e[s]||void 0===e[s][i])return;delete e[s][i],void 0!==e[s]._visualValues&&void 0!==e[s]._visualValues[i]&&delete e[s]._visualValues[i]}}}const Ns=t=>"reset"===t||"none"===t,Hs=(t,e)=>e?t:Object.assign({},t);class js{static defaults={};static datasetElementType=null;static dataElementType=null;constructor(t,e){this.chart=t,this._ctx=t.ctx,this.index=e,this._cachedDataOpts={},this._cachedMeta=this.getMeta(),this._type=this._cachedMeta.type,this.options=void 0,this._parsing=!1,this._data=void 0,this._objectData=void 0,this._sharedOptions=void 0,this._drawStart=void 0,this._drawCount=void 0,this.enableOptionSharing=!1,this.supportsDecimation=!1,this.$context=void 0,this._syncList=[],this.datasetElementType=new.target.datasetElementType,this.dataElementType=new.target.dataElementType,this.initialize()}initialize(){const t=this._cachedMeta;this.configure(),this.linkScales(),t._stacked=Is(t.vScale,t),this.addElements(),this.options.fill&&!this.chart.isPluginEnabled("filler")&&console.warn("Tried to use the 'fill' option without the 'Filler' plugin enabled. 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t=this.getDataset(),e=t.data||(t.data=[]),i=this._data;if(o(e)){const t=this._cachedMeta;this._data=function(t,e){const{iScale:i,vScale:s}=e,n="x"===i.axis?"x":"y",o="x"===s.axis?"x":"y",a=Object.keys(t),r=new Array(a.length);let l,h,c;for(l=0,h=a.length;l0&&i._parsed[t-1];if(!1===this._parsing)i._parsed=s,i._sorted=!0,d=s;else{d=n(s[t])?this.parseArrayData(i,s,t,e):o(s[t])?this.parseObjectData(i,s,t,e):this.parsePrimitiveData(i,s,t,e);const a=()=>null===c[l]||f&&c[l]t&&!e.hidden&&e._stacked&&{keys:Es(i,!0),values:null})(e,i,this.chart),h={min:Number.POSITIVE_INFINITY,max:Number.NEGATIVE_INFINITY},{min:c,max:d}=function(t){const{min:e,max:i,minDefined:s,maxDefined:n}=t.getUserBounds();return{min:s?e:Number.NEGATIVE_INFINITY,max:n?i:Number.POSITIVE_INFINITY}}(r);let u,f;function g(){f=s[u];const e=f[r.axis];return!a(f[t.axis])||c>e||d=0;--u)if(!g()){this.updateRangeFromParsed(h,t,f,l);break}return h}getAllParsedValues(t){const e=this._cachedMeta._parsed,i=[];let s,n,o;for(s=0,n=e.length;s=0&&tthis.getContext(i,s,e)),c);return f.$shared&&(f.$shared=r,n[o]=Object.freeze(Hs(f,r))),f}_resolveAnimations(t,e,i){const s=this.chart,n=this._cachedDataOpts,o=`animation-${e}`,a=n[o];if(a)return a;let r;if(!1!==s.options.animation){const s=this.chart.config,n=s.datasetAnimationScopeKeys(this._type,e),o=s.getOptionScopes(this.getDataset(),n);r=s.createResolver(o,this.getContext(t,i,e))}const l=new Ts(s,r&&r.animations);return r&&r._cacheable&&(n[o]=Object.freeze(l)),l}getSharedOptions(t){if(t.$shared)return this._sharedOptions||(this._sharedOptions=Object.assign({},t))}includeOptions(t,e){return!e||Ns(t)||this.chart._animationsDisabled}_getSharedOptions(t,e){const i=this.resolveDataElementOptions(t,e),s=this._sharedOptions,n=this.getSharedOptions(i),o=this.includeOptions(e,n)||n!==s;return this.updateSharedOptions(n,e,i),{sharedOptions:n,includeOptions:o}}updateElement(t,e,i,s){Ns(s)?Object.assign(t,i):this._resolveAnimations(e,s).update(t,i)}updateSharedOptions(t,e,i){t&&!Ns(e)&&this._resolveAnimations(void 0,e).update(t,i)}_setStyle(t,e,i,s){t.active=s;const n=this.getStyle(e,s);this._resolveAnimations(e,i,s).update(t,{options:!s&&this.getSharedOptions(n)||n})}removeHoverStyle(t,e,i){this._setStyle(t,i,"active",!1)}setHoverStyle(t,e,i){this._setStyle(t,i,"active",!0)}_removeDatasetHoverStyle(){const t=this._cachedMeta.dataset;t&&this._setStyle(t,void 0,"active",!1)}_setDatasetHoverStyle(){const t=this._cachedMeta.dataset;t&&this._setStyle(t,void 0,"active",!0)}_resyncElements(t){const e=this._data,i=this._cachedMeta.data;for(const[t,e,i]of this._syncList)this[t](e,i);this._syncList=[];const s=i.length,n=e.length,o=Math.min(n,s);o&&this.parse(0,o),n>s?this._insertElements(s,n-s,t):n{for(t.length+=e,a=t.length-1;a>=o;a--)t[a]=t[a-e]};for(r(n),a=t;a{s[t]=i[t]&&i[t].active()?i[t]._to:this[t]})),s}}function Ys(t,e){const i=t.options.ticks,n=function(t){const e=t.options.offset,i=t._tickSize(),s=t._length/i+(e?0:1),n=t._maxLength/i;return Math.floor(Math.min(s,n))}(t),o=Math.min(i.maxTicksLimit||n,n),a=i.major.enabled?function(t){const e=[];let i,s;for(i=0,s=t.length;io)return function(t,e,i,s){let n,o=0,a=i[0];for(s=Math.ceil(s),n=0;nn)return e}return Math.max(n,1)}(a,e,o);if(r>0){let t,i;const n=r>1?Math.round((h-l)/(r-1)):null;for(Us(e,c,d,s(n)?0:l-n,l),t=0,i=r-1;t"top"===e||"left"===e?t[e]+i:t[e]-i,qs=(t,e)=>Math.min(e||t,t);function Ks(t,e){const i=[],s=t.length/e,n=t.length;let o=0;for(;oa+r)))return h}function Js(t){return t.drawTicks?t.tickLength:0}function Zs(t,e){if(!t.display)return 0;const i=Si(t.font,e),s=ki(t.padding);return(n(t.text)?t.text.length:1)*i.lineHeight+s.height}function Qs(t,e,i){let s=ut(t);return(i&&"right"!==e||!i&&"right"===e)&&(s=(t=>"left"===t?"right":"right"===t?"left":t)(s)),s}class tn extends $s{constructor(t){super(),this.id=t.id,this.type=t.type,this.options=void 0,this.ctx=t.ctx,this.chart=t.chart,this.top=void 0,this.bottom=void 0,this.left=void 0,this.right=void 0,this.width=void 0,this.height=void 0,this._margins={left:0,right:0,top:0,bottom:0},this.maxWidth=void 0,this.maxHeight=void 0,this.paddingTop=void 0,this.paddingBottom=void 0,this.paddingLeft=void 0,this.paddingRight=void 0,this.axis=void 0,this.labelRotation=void 0,this.min=void 0,this.max=void 0,this._range=void 0,this.ticks=[],this._gridLineItems=null,this._labelItems=null,this._labelSizes=null,this._length=0,this._maxLength=0,this._longestTextCache={},this._startPixel=void 0,this._endPixel=void 0,this._reversePixels=!1,this._userMax=void 0,this._userMin=void 0,this._suggestedMax=void 0,this._suggestedMin=void 0,this._ticksLength=0,this._borderValue=0,this._cache={},this._dataLimitsCached=!1,this.$context=void 0}init(t){this.options=t.setContext(this.getContext()),this.axis=t.axis,this._userMin=this.parse(t.min),this._userMax=this.parse(t.max),this._suggestedMin=this.parse(t.suggestedMin),this._suggestedMax=this.parse(t.suggestedMax)}parse(t,e){return t}getUserBounds(){let{_userMin:t,_userMax:e,_suggestedMin:i,_suggestedMax:s}=this;return t=r(t,Number.POSITIVE_INFINITY),e=r(e,Number.NEGATIVE_INFINITY),i=r(i,Number.POSITIVE_INFINITY),s=r(s,Number.NEGATIVE_INFINITY),{min:r(t,i),max:r(e,s),minDefined:a(t),maxDefined:a(e)}}getMinMax(t){let e,{min:i,max:s,minDefined:n,maxDefined:o}=this.getUserBounds();if(n&&o)return{min:i,max:s};const a=this.getMatchingVisibleMetas();for(let r=0,l=a.length;rs?s:i,s=n&&i>s?i:s,{min:r(i,r(s,i)),max:r(s,r(i,s))}}getPadding(){return{left:this.paddingLeft||0,top:this.paddingTop||0,right:this.paddingRight||0,bottom:this.paddingBottom||0}}getTicks(){return this.ticks}getLabels(){const t=this.chart.data;return this.options.labels||(this.isHorizontal()?t.xLabels:t.yLabels)||t.labels||[]}getLabelItems(t=this.chart.chartArea){return this._labelItems||(this._labelItems=this._computeLabelItems(t))}beforeLayout(){this._cache={},this._dataLimitsCached=!1}beforeUpdate(){d(this.options.beforeUpdate,[this])}update(t,e,i){const{beginAtZero:s,grace:n,ticks:o}=this.options,a=o.sampleSize;this.beforeUpdate(),this.maxWidth=t,this.maxHeight=e,this._margins=i=Object.assign({left:0,right:0,top:0,bottom:0},i),this.ticks=null,this._labelSizes=null,this._gridLineItems=null,this._labelItems=null,this.beforeSetDimensions(),this.setDimensions(),this.afterSetDimensions(),this._maxLength=this.isHorizontal()?this.width+i.left+i.right:this.height+i.top+i.bottom,this._dataLimitsCached||(this.beforeDataLimits(),this.determineDataLimits(),this.afterDataLimits(),this._range=Di(this,n,s),this._dataLimitsCached=!0),this.beforeBuildTicks(),this.ticks=this.buildTicks()||[],this.afterBuildTicks();const r=a=n||i<=1||!this.isHorizontal())return void(this.labelRotation=s);const h=this._getLabelSizes(),c=h.widest.width,d=h.highest.height,u=Z(this.chart.width-c,0,this.maxWidth);o=t.offset?this.maxWidth/i:u/(i-1),c+6>o&&(o=u/(i-(t.offset?.5:1)),a=this.maxHeight-Js(t.grid)-e.padding-Zs(t.title,this.chart.options.font),r=Math.sqrt(c*c+d*d),l=Y(Math.min(Math.asin(Z((h.highest.height+6)/o,-1,1)),Math.asin(Z(a/r,-1,1))-Math.asin(Z(d/r,-1,1)))),l=Math.max(s,Math.min(n,l))),this.labelRotation=l}afterCalculateLabelRotation(){d(this.options.afterCalculateLabelRotation,[this])}afterAutoSkip(){}beforeFit(){d(this.options.beforeFit,[this])}fit(){const t={width:0,height:0},{chart:e,options:{ticks:i,title:s,grid:n}}=this,o=this._isVisible(),a=this.isHorizontal();if(o){const o=Zs(s,e.options.font);if(a?(t.width=this.maxWidth,t.height=Js(n)+o):(t.height=this.maxHeight,t.width=Js(n)+o),i.display&&this.ticks.length){const{first:e,last:s,widest:n,highest:o}=this._getLabelSizes(),r=2*i.padding,l=$(this.labelRotation),h=Math.cos(l),c=Math.sin(l);if(a){const e=i.mirror?0:c*n.width+h*o.height;t.height=Math.min(this.maxHeight,t.height+e+r)}else{const e=i.mirror?0:h*n.width+c*o.height;t.width=Math.min(this.maxWidth,t.width+e+r)}this._calculatePadding(e,s,c,h)}}this._handleMargins(),a?(this.width=this._length=e.width-this._margins.left-this._margins.right,this.height=t.height):(this.width=t.width,this.height=this._length=e.height-this._margins.top-this._margins.bottom)}_calculatePadding(t,e,i,s){const{ticks:{align:n,padding:o},position:a}=this.options,r=0!==this.labelRotation,l="top"!==a&&"x"===this.axis;if(this.isHorizontal()){const a=this.getPixelForTick(0)-this.left,h=this.right-this.getPixelForTick(this.ticks.length-1);let c=0,d=0;r?l?(c=s*t.width,d=i*e.height):(c=i*t.height,d=s*e.width):"start"===n?d=e.width:"end"===n?c=t.width:"inner"!==n&&(c=t.width/2,d=e.width/2),this.paddingLeft=Math.max((c-a+o)*this.width/(this.width-a),0),this.paddingRight=Math.max((d-h+o)*this.width/(this.width-h),0)}else{let i=e.height/2,s=t.height/2;"start"===n?(i=0,s=t.height):"end"===n&&(i=e.height,s=0),this.paddingTop=i+o,this.paddingBottom=s+o}}_handleMargins(){this._margins&&(this._margins.left=Math.max(this.paddingLeft,this._margins.left),this._margins.top=Math.max(this.paddingTop,this._margins.top),this._margins.right=Math.max(this.paddingRight,this._margins.right),this._margins.bottom=Math.max(this.paddingBottom,this._margins.bottom))}afterFit(){d(this.options.afterFit,[this])}isHorizontal(){const{axis:t,position:e}=this.options;return"top"===e||"bottom"===e||"x"===t}isFullSize(){return this.options.fullSize}_convertTicksToLabels(t){let e,i;for(this.beforeTickToLabelConversion(),this.generateTickLabels(t),e=0,i=t.length;e{const i=t.gc,s=i.length/2;let n;if(s>e){for(n=0;n({width:r[t]||0,height:l[t]||0});return{first:P(0),last:P(e-1),widest:P(k),highest:P(S),widths:r,heights:l}}getLabelForValue(t){return t}getPixelForValue(t,e){return NaN}getValueForPixel(t){}getPixelForTick(t){const e=this.ticks;return t<0||t>e.length-1?null:this.getPixelForValue(e[t].value)}getPixelForDecimal(t){this._reversePixels&&(t=1-t);const e=this._startPixel+t*this._length;return Q(this._alignToPixels?Ae(this.chart,e,0):e)}getDecimalForPixel(t){const e=(t-this._startPixel)/this._length;return this._reversePixels?1-e:e}getBasePixel(){return this.getPixelForValue(this.getBaseValue())}getBaseValue(){const{min:t,max:e}=this;return t<0&&e<0?e:t>0&&e>0?t:0}getContext(t){const e=this.ticks||[];if(t>=0&&ta*s?a/i:r/s:r*s0}_computeGridLineItems(t){const e=this.axis,i=this.chart,s=this.options,{grid:n,position:a,border:r}=s,h=n.offset,c=this.isHorizontal(),d=this.ticks.length+(h?1:0),u=Js(n),f=[],g=r.setContext(this.getContext()),p=g.display?g.width:0,m=p/2,x=function(t){return Ae(i,t,p)};let b,_,y,v,M,w,k,S,P,D,C,O;if("top"===a)b=x(this.bottom),w=this.bottom-u,S=b-m,D=x(t.top)+m,O=t.bottom;else if("bottom"===a)b=x(this.top),D=t.top,O=x(t.bottom)-m,w=b+m,S=this.top+u;else if("left"===a)b=x(this.right),M=this.right-u,k=b-m,P=x(t.left)+m,C=t.right;else if("right"===a)b=x(this.left),P=t.left,C=x(t.right)-m,M=b+m,k=this.left+u;else if("x"===e){if("center"===a)b=x((t.top+t.bottom)/2+.5);else if(o(a)){const t=Object.keys(a)[0],e=a[t];b=x(this.chart.scales[t].getPixelForValue(e))}D=t.top,O=t.bottom,w=b+m,S=w+u}else if("y"===e){if("center"===a)b=x((t.left+t.right)/2);else if(o(a)){const t=Object.keys(a)[0],e=a[t];b=x(this.chart.scales[t].getPixelForValue(e))}M=b-m,k=M-u,P=t.left,C=t.right}const A=l(s.ticks.maxTicksLimit,d),T=Math.max(1,Math.ceil(d/A));for(_=0;_0&&(o-=s/2)}d={left:o,top:n,width:s+e.width,height:i+e.height,color:t.backdropColor}}x.push({label:v,font:P,textOffset:O,options:{rotation:m,color:i,strokeColor:o,strokeWidth:h,textAlign:f,textBaseline:A,translation:[M,w],backdrop:d}})}return x}_getXAxisLabelAlignment(){const{position:t,ticks:e}=this.options;if(-$(this.labelRotation))return"top"===t?"left":"right";let i="center";return"start"===e.align?i="left":"end"===e.align?i="right":"inner"===e.align&&(i="inner"),i}_getYAxisLabelAlignment(t){const{position:e,ticks:{crossAlign:i,mirror:s,padding:n}}=this.options,o=t+n,a=this._getLabelSizes().widest.width;let r,l;return"left"===e?s?(l=this.right+n,"near"===i?r="left":"center"===i?(r="center",l+=a/2):(r="right",l+=a)):(l=this.right-o,"near"===i?r="right":"center"===i?(r="center",l-=a/2):(r="left",l=this.left)):"right"===e?s?(l=this.left+n,"near"===i?r="right":"center"===i?(r="center",l-=a/2):(r="left",l-=a)):(l=this.left+o,"near"===i?r="left":"center"===i?(r="center",l+=a/2):(r="right",l=this.right)):r="right",{textAlign:r,x:l}}_computeLabelArea(){if(this.options.ticks.mirror)return;const t=this.chart,e=this.options.position;return"left"===e||"right"===e?{top:0,left:this.left,bottom:t.height,right:this.right}:"top"===e||"bottom"===e?{top:this.top,left:0,bottom:this.bottom,right:t.width}:void 0}drawBackground(){const{ctx:t,options:{backgroundColor:e},left:i,top:s,width:n,height:o}=this;e&&(t.save(),t.fillStyle=e,t.fillRect(i,s,n,o),t.restore())}getLineWidthForValue(t){const e=this.options.grid;if(!this._isVisible()||!e.display)return 0;const i=this.ticks.findIndex((e=>e.value===t));if(i>=0){return e.setContext(this.getContext(i)).lineWidth}return 0}drawGrid(t){const e=this.options.grid,i=this.ctx,s=this._gridLineItems||(this._gridLineItems=this._computeGridLineItems(t));let n,o;const a=(t,e,s)=>{s.width&&s.color&&(i.save(),i.lineWidth=s.width,i.strokeStyle=s.color,i.setLineDash(s.borderDash||[]),i.lineDashOffset=s.borderDashOffset,i.beginPath(),i.moveTo(t.x,t.y),i.lineTo(e.x,e.y),i.stroke(),i.restore())};if(e.display)for(n=0,o=s.length;n{this.drawBackground(),this.drawGrid(t),this.drawTitle()}},{z:s,draw:()=>{this.drawBorder()}},{z:e,draw:t=>{this.drawLabels(t)}}]:[{z:e,draw:t=>{this.draw(t)}}]}getMatchingVisibleMetas(t){const e=this.chart.getSortedVisibleDatasetMetas(),i=this.axis+"AxisID",s=[];let n,o;for(n=0,o=e.length;n{const s=i.split("."),n=s.pop(),o=[t].concat(s).join("."),a=e[i].split("."),r=a.pop(),l=a.join(".");ue.route(o,n,l,r)}))}(e,t.defaultRoutes);t.descriptors&&ue.describe(e,t.descriptors)}(t,o,i),this.override&&ue.override(t.id,t.overrides)),o}get(t){return this.items[t]}unregister(t){const e=this.items,i=t.id,s=this.scope;i in e&&delete e[i],s&&i in ue[s]&&(delete ue[s][i],this.override&&delete re[i])}}class sn{constructor(){this.controllers=new en(js,"datasets",!0),this.elements=new en($s,"elements"),this.plugins=new en(Object,"plugins"),this.scales=new en(tn,"scales"),this._typedRegistries=[this.controllers,this.scales,this.elements]}add(...t){this._each("register",t)}remove(...t){this._each("unregister",t)}addControllers(...t){this._each("register",t,this.controllers)}addElements(...t){this._each("register",t,this.elements)}addPlugins(...t){this._each("register",t,this.plugins)}addScales(...t){this._each("register",t,this.scales)}getController(t){return this._get(t,this.controllers,"controller")}getElement(t){return this._get(t,this.elements,"element")}getPlugin(t){return this._get(t,this.plugins,"plugin")}getScale(t){return this._get(t,this.scales,"scale")}removeControllers(...t){this._each("unregister",t,this.controllers)}removeElements(...t){this._each("unregister",t,this.elements)}removePlugins(...t){this._each("unregister",t,this.plugins)}removeScales(...t){this._each("unregister",t,this.scales)}_each(t,e,i){[...e].forEach((e=>{const s=i||this._getRegistryForType(e);i||s.isForType(e)||s===this.plugins&&e.id?this._exec(t,s,e):u(e,(e=>{const s=i||this._getRegistryForType(e);this._exec(t,s,e)}))}))}_exec(t,e,i){const s=w(t);d(i["before"+s],[],i),e[t](i),d(i["after"+s],[],i)}_getRegistryForType(t){for(let e=0;et.filter((t=>!e.some((e=>t.plugin.id===e.plugin.id))));this._notify(s(e,i),t,"stop"),this._notify(s(i,e),t,"start")}}function an(t,e){return e||!1!==t?!0===t?{}:t:null}function rn(t,{plugin:e,local:i},s,n){const o=t.pluginScopeKeys(e),a=t.getOptionScopes(s,o);return i&&e.defaults&&a.push(e.defaults),t.createResolver(a,n,[""],{scriptable:!1,indexable:!1,allKeys:!0})}function ln(t,e){const i=ue.datasets[t]||{};return((e.datasets||{})[t]||{}).indexAxis||e.indexAxis||i.indexAxis||"x"}function hn(t){if("x"===t||"y"===t||"r"===t)return t}function cn(t,...e){if(hn(t))return t;for(const s of e){const e=s.axis||("top"===(i=s.position)||"bottom"===i?"x":"left"===i||"right"===i?"y":void 0)||t.length>1&&hn(t[0].toLowerCase());if(e)return e}var i;throw new Error(`Cannot determine type of '${t}' axis. Please provide 'axis' or 'position' option.`)}function dn(t,e,i){if(i[e+"AxisID"]===t)return{axis:e}}function un(t,e){const i=re[t.type]||{scales:{}},s=e.scales||{},n=ln(t.type,e),a=Object.create(null);return Object.keys(s).forEach((e=>{const r=s[e];if(!o(r))return console.error(`Invalid scale configuration for scale: ${e}`);if(r._proxy)return console.warn(`Ignoring resolver passed as options for scale: ${e}`);const l=cn(e,r,function(t,e){if(e.data&&e.data.datasets){const i=e.data.datasets.filter((e=>e.xAxisID===t||e.yAxisID===t));if(i.length)return dn(t,"x",i[0])||dn(t,"y",i[0])}return{}}(e,t),ue.scales[r.type]),h=function(t,e){return t===e?"_index_":"_value_"}(l,n),c=i.scales||{};a[e]=b(Object.create(null),[{axis:l},r,c[l],c[h]])})),t.data.datasets.forEach((i=>{const n=i.type||t.type,o=i.indexAxis||ln(n,e),r=(re[n]||{}).scales||{};Object.keys(r).forEach((t=>{const e=function(t,e){let i=t;return"_index_"===t?i=e:"_value_"===t&&(i="x"===e?"y":"x"),i}(t,o),n=i[e+"AxisID"]||e;a[n]=a[n]||Object.create(null),b(a[n],[{axis:e},s[n],r[t]])}))})),Object.keys(a).forEach((t=>{const e=a[t];b(e,[ue.scales[e.type],ue.scale])})),a}function fn(t){const e=t.options||(t.options={});e.plugins=l(e.plugins,{}),e.scales=un(t,e)}function gn(t){return(t=t||{}).datasets=t.datasets||[],t.labels=t.labels||[],t}const pn=new Map,mn=new Set;function xn(t,e){let i=pn.get(t);return i||(i=e(),pn.set(t,i),mn.add(i)),i}const bn=(t,e,i)=>{const s=M(e,i);void 0!==s&&t.add(s)};class _n{constructor(t){this._config=function(t){return(t=t||{}).data=gn(t.data),fn(t),t}(t),this._scopeCache=new Map,this._resolverCache=new Map}get platform(){return this._config.platform}get type(){return this._config.type}set type(t){this._config.type=t}get data(){return this._config.data}set data(t){this._config.data=gn(t)}get options(){return this._config.options}set options(t){this._config.options=t}get plugins(){return this._config.plugins}update(){const t=this._config;this.clearCache(),fn(t)}clearCache(){this._scopeCache.clear(),this._resolverCache.clear()}datasetScopeKeys(t){return xn(t,(()=>[[`datasets.${t}`,""]]))}datasetAnimationScopeKeys(t,e){return xn(`${t}.transition.${e}`,(()=>[[`datasets.${t}.transitions.${e}`,`transitions.${e}`],[`datasets.${t}`,""]]))}datasetElementScopeKeys(t,e){return xn(`${t}-${e}`,(()=>[[`datasets.${t}.elements.${e}`,`datasets.${t}`,`elements.${e}`,""]]))}pluginScopeKeys(t){const e=t.id;return xn(`${this.type}-plugin-${e}`,(()=>[[`plugins.${e}`,...t.additionalOptionScopes||[]]]))}_cachedScopes(t,e){const i=this._scopeCache;let s=i.get(t);return s&&!e||(s=new Map,i.set(t,s)),s}getOptionScopes(t,e,i){const{options:s,type:n}=this,o=this._cachedScopes(t,i),a=o.get(e);if(a)return a;const r=new Set;e.forEach((e=>{t&&(r.add(t),e.forEach((e=>bn(r,t,e)))),e.forEach((t=>bn(r,s,t))),e.forEach((t=>bn(r,re[n]||{},t))),e.forEach((t=>bn(r,ue,t))),e.forEach((t=>bn(r,le,t)))}));const l=Array.from(r);return 0===l.length&&l.push(Object.create(null)),mn.has(e)&&o.set(e,l),l}chartOptionScopes(){const{options:t,type:e}=this;return[t,re[e]||{},ue.datasets[e]||{},{type:e},ue,le]}resolveNamedOptions(t,e,i,s=[""]){const o={$shared:!0},{resolver:a,subPrefixes:r}=yn(this._resolverCache,t,s);let l=a;if(function(t,e){const{isScriptable:i,isIndexable:s}=Ye(t);for(const o of e){const e=i(o),a=s(o),r=(a||e)&&t[o];if(e&&(S(r)||vn(r))||a&&n(r))return!0}return!1}(a,e)){o.$shared=!1;l=$e(a,i=S(i)?i():i,this.createResolver(t,i,r))}for(const t of e)o[t]=l[t];return o}createResolver(t,e,i=[""],s){const{resolver:n}=yn(this._resolverCache,t,i);return o(e)?$e(n,e,void 0,s):n}}function yn(t,e,i){let s=t.get(e);s||(s=new Map,t.set(e,s));const n=i.join();let o=s.get(n);if(!o){o={resolver:je(e,i),subPrefixes:i.filter((t=>!t.toLowerCase().includes("hover")))},s.set(n,o)}return o}const vn=t=>o(t)&&Object.getOwnPropertyNames(t).some((e=>S(t[e])));const Mn=["top","bottom","left","right","chartArea"];function wn(t,e){return"top"===t||"bottom"===t||-1===Mn.indexOf(t)&&"x"===e}function kn(t,e){return function(i,s){return i[t]===s[t]?i[e]-s[e]:i[t]-s[t]}}function Sn(t){const e=t.chart,i=e.options.animation;e.notifyPlugins("afterRender"),d(i&&i.onComplete,[t],e)}function Pn(t){const e=t.chart,i=e.options.animation;d(i&&i.onProgress,[t],e)}function Dn(t){return fe()&&"string"==typeof t?t=document.getElementById(t):t&&t.length&&(t=t[0]),t&&t.canvas&&(t=t.canvas),t}const Cn={},On=t=>{const e=Dn(t);return Object.values(Cn).filter((t=>t.canvas===e)).pop()};function An(t,e,i){const s=Object.keys(t);for(const n of s){const s=+n;if(s>=e){const o=t[n];delete t[n],(i>0||s>e)&&(t[s+i]=o)}}}class Tn{static defaults=ue;static instances=Cn;static overrides=re;static registry=nn;static version="4.5.1";static getChart=On;static register(...t){nn.add(...t),Ln()}static unregister(...t){nn.remove(...t),Ln()}constructor(t,e){const s=this.config=new _n(e),n=Dn(t),o=On(n);if(o)throw new Error("Canvas is already in use. Chart with ID '"+o.id+"' must be destroyed before the canvas with ID '"+o.canvas.id+"' can be reused.");const a=s.createResolver(s.chartOptionScopes(),this.getContext());this.platform=new(s.platform||Ps(n)),this.platform.updateConfig(s);const r=this.platform.acquireContext(n,a.aspectRatio),l=r&&r.canvas,h=l&&l.height,c=l&&l.width;this.id=i(),this.ctx=r,this.canvas=l,this.width=c,this.height=h,this._options=a,this._aspectRatio=this.aspectRatio,this._layers=[],this._metasets=[],this._stacks=void 0,this.boxes=[],this.currentDevicePixelRatio=void 0,this.chartArea=void 0,this._active=[],this._lastEvent=void 0,this._listeners={},this._responsiveListeners=void 0,this._sortedMetasets=[],this.scales={},this._plugins=new on,this.$proxies={},this._hiddenIndices={},this.attached=!1,this._animationsDisabled=void 0,this.$context=void 0,this._doResize=dt((t=>this.update(t)),a.resizeDelay||0),this._dataChanges=[],Cn[this.id]=this,r&&l?(bt.listen(this,"complete",Sn),bt.listen(this,"progress",Pn),this._initialize(),this.attached&&this.update()):console.error("Failed to create chart: can't acquire context from the given item")}get aspectRatio(){const{options:{aspectRatio:t,maintainAspectRatio:e},width:i,height:n,_aspectRatio:o}=this;return s(t)?e&&o?o:n?i/n:null:t}get data(){return this.config.data}set data(t){this.config.data=t}get options(){return this._options}set options(t){this.config.options=t}get registry(){return nn}_initialize(){return this.notifyPlugins("beforeInit"),this.options.responsive?this.resize():ke(this,this.options.devicePixelRatio),this.bindEvents(),this.notifyPlugins("afterInit"),this}clear(){return Te(this.canvas,this.ctx),this}stop(){return bt.stop(this),this}resize(t,e){bt.running(this)?this._resizeBeforeDraw={width:t,height:e}:this._resize(t,e)}_resize(t,e){const i=this.options,s=this.canvas,n=i.maintainAspectRatio&&this.aspectRatio,o=this.platform.getMaximumSize(s,t,e,n),a=i.devicePixelRatio||this.platform.getDevicePixelRatio(),r=this.width?"resize":"attach";this.width=o.width,this.height=o.height,this._aspectRatio=this.aspectRatio,ke(this,a,!0)&&(this.notifyPlugins("resize",{size:o}),d(i.onResize,[this,o],this),this.attached&&this._doResize(r)&&this.render())}ensureScalesHaveIDs(){u(this.options.scales||{},((t,e)=>{t.id=e}))}buildOrUpdateScales(){const t=this.options,e=t.scales,i=this.scales,s=Object.keys(i).reduce(((t,e)=>(t[e]=!1,t)),{});let n=[];e&&(n=n.concat(Object.keys(e).map((t=>{const i=e[t],s=cn(t,i),n="r"===s,o="x"===s;return{options:i,dposition:n?"chartArea":o?"bottom":"left",dtype:n?"radialLinear":o?"category":"linear"}})))),u(n,(e=>{const n=e.options,o=n.id,a=cn(o,n),r=l(n.type,e.dtype);void 0!==n.position&&wn(n.position,a)===wn(e.dposition)||(n.position=e.dposition),s[o]=!0;let h=null;if(o in i&&i[o].type===r)h=i[o];else{h=new(nn.getScale(r))({id:o,type:r,ctx:this.ctx,chart:this}),i[h.id]=h}h.init(n,t)})),u(s,((t,e)=>{t||delete i[e]})),u(i,(t=>{ls.configure(this,t,t.options),ls.addBox(this,t)}))}_updateMetasets(){const t=this._metasets,e=this.data.datasets.length,i=t.length;if(t.sort(((t,e)=>t.index-e.index)),i>e){for(let t=e;te.length&&delete this._stacks,t.forEach(((t,i)=>{0===e.filter((e=>e===t._dataset)).length&&this._destroyDatasetMeta(i)}))}buildOrUpdateControllers(){const t=[],e=this.data.datasets;let i,s;for(this._removeUnreferencedMetasets(),i=0,s=e.length;i{this.getDatasetMeta(e).controller.reset()}),this)}reset(){this._resetElements(),this.notifyPlugins("reset")}update(t){const e=this.config;e.update();const i=this._options=e.createResolver(e.chartOptionScopes(),this.getContext()),s=this._animationsDisabled=!i.animation;if(this._updateScales(),this._checkEventBindings(),this._updateHiddenIndices(),this._plugins.invalidate(),!1===this.notifyPlugins("beforeUpdate",{mode:t,cancelable:!0}))return;const n=this.buildOrUpdateControllers();this.notifyPlugins("beforeElementsUpdate");let o=0;for(let t=0,e=this.data.datasets.length;t{t.reset()})),this._updateDatasets(t),this.notifyPlugins("afterUpdate",{mode:t}),this._layers.sort(kn("z","_idx"));const{_active:a,_lastEvent:r}=this;r?this._eventHandler(r,!0):a.length&&this._updateHoverStyles(a,a,!0),this.render()}_updateScales(){u(this.scales,(t=>{ls.removeBox(this,t)})),this.ensureScalesHaveIDs(),this.buildOrUpdateScales()}_checkEventBindings(){const t=this.options,e=new Set(Object.keys(this._listeners)),i=new Set(t.events);P(e,i)&&!!this._responsiveListeners===t.responsive||(this.unbindEvents(),this.bindEvents())}_updateHiddenIndices(){const{_hiddenIndices:t}=this,e=this._getUniformDataChanges()||[];for(const{method:i,start:s,count:n}of e){An(t,s,"_removeElements"===i?-n:n)}}_getUniformDataChanges(){const t=this._dataChanges;if(!t||!t.length)return;this._dataChanges=[];const e=this.data.datasets.length,i=e=>new Set(t.filter((t=>t[0]===e)).map(((t,e)=>e+","+t.splice(1).join(",")))),s=i(0);for(let t=1;tt.split(","))).map((t=>({method:t[1],start:+t[2],count:+t[3]})))}_updateLayout(t){if(!1===this.notifyPlugins("beforeLayout",{cancelable:!0}))return;ls.update(this,this.width,this.height,t);const e=this.chartArea,i=e.width<=0||e.height<=0;this._layers=[],u(this.boxes,(t=>{i&&"chartArea"===t.position||(t.configure&&t.configure(),this._layers.push(...t._layers()))}),this),this._layers.forEach(((t,e)=>{t._idx=e})),this.notifyPlugins("afterLayout")}_updateDatasets(t){if(!1!==this.notifyPlugins("beforeDatasetsUpdate",{mode:t,cancelable:!0})){for(let t=0,e=this.data.datasets.length;t=0;--e)this._drawDataset(t[e]);this.notifyPlugins("afterDatasetsDraw")}_drawDataset(t){const e=this.ctx,i={meta:t,index:t.index,cancelable:!0},s=Ni(this,t);!1!==this.notifyPlugins("beforeDatasetDraw",i)&&(s&&Ie(e,s),t.controller.draw(),s&&ze(e),i.cancelable=!1,this.notifyPlugins("afterDatasetDraw",i))}isPointInArea(t){return Re(t,this.chartArea,this._minPadding)}getElementsAtEventForMode(t,e,i,s){const n=Ki.modes[e];return"function"==typeof n?n(this,t,i,s):[]}getDatasetMeta(t){const e=this.data.datasets[t],i=this._metasets;let s=i.filter((t=>t&&t._dataset===e)).pop();return s||(s={type:null,data:[],dataset:null,controller:null,hidden:null,xAxisID:null,yAxisID:null,order:e&&e.order||0,index:t,_dataset:e,_parsed:[],_sorted:!1},i.push(s)),s}getContext(){return this.$context||(this.$context=Ci(null,{chart:this,type:"chart"}))}getVisibleDatasetCount(){return this.getSortedVisibleDatasetMetas().length}isDatasetVisible(t){const e=this.data.datasets[t];if(!e)return!1;const i=this.getDatasetMeta(t);return"boolean"==typeof i.hidden?!i.hidden:!e.hidden}setDatasetVisibility(t,e){this.getDatasetMeta(t).hidden=!e}toggleDataVisibility(t){this._hiddenIndices[t]=!this._hiddenIndices[t]}getDataVisibility(t){return!this._hiddenIndices[t]}_updateVisibility(t,e,i){const s=i?"show":"hide",n=this.getDatasetMeta(t),o=n.controller._resolveAnimations(void 0,s);k(e)?(n.data[e].hidden=!i,this.update()):(this.setDatasetVisibility(t,i),o.update(n,{visible:i}),this.update((e=>e.datasetIndex===t?s:void 0)))}hide(t,e){this._updateVisibility(t,e,!1)}show(t,e){this._updateVisibility(t,e,!0)}_destroyDatasetMeta(t){const e=this._metasets[t];e&&e.controller&&e.controller._destroy(),delete this._metasets[t]}_stop(){let t,e;for(this.stop(),bt.remove(this),t=0,e=this.data.datasets.length;t{e.addEventListener(this,i,s),t[i]=s},s=(t,e,i)=>{t.offsetX=e,t.offsetY=i,this._eventHandler(t)};u(this.options.events,(t=>i(t,s)))}bindResponsiveEvents(){this._responsiveListeners||(this._responsiveListeners={});const t=this._responsiveListeners,e=this.platform,i=(i,s)=>{e.addEventListener(this,i,s),t[i]=s},s=(i,s)=>{t[i]&&(e.removeEventListener(this,i,s),delete t[i])},n=(t,e)=>{this.canvas&&this.resize(t,e)};let o;const a=()=>{s("attach",a),this.attached=!0,this.resize(),i("resize",n),i("detach",o)};o=()=>{this.attached=!1,s("resize",n),this._stop(),this._resize(0,0),i("attach",a)},e.isAttached(this.canvas)?a():o()}unbindEvents(){u(this._listeners,((t,e)=>{this.platform.removeEventListener(this,e,t)})),this._listeners={},u(this._responsiveListeners,((t,e)=>{this.platform.removeEventListener(this,e,t)})),this._responsiveListeners=void 0}updateHoverStyle(t,e,i){const s=i?"set":"remove";let n,o,a,r;for("dataset"===e&&(n=this.getDatasetMeta(t[0].datasetIndex),n.controller["_"+s+"DatasetHoverStyle"]()),a=0,r=t.length;a{const i=this.getDatasetMeta(t);if(!i)throw new Error("No dataset found at index "+t);return{datasetIndex:t,element:i.data[e],index:e}}));!f(i,e)&&(this._active=i,this._lastEvent=null,this._updateHoverStyles(i,e))}notifyPlugins(t,e,i){return this._plugins.notify(this,t,e,i)}isPluginEnabled(t){return 1===this._plugins._cache.filter((e=>e.plugin.id===t)).length}_updateHoverStyles(t,e,i){const s=this.options.hover,n=(t,e)=>t.filter((t=>!e.some((e=>t.datasetIndex===e.datasetIndex&&t.index===e.index)))),o=n(e,t),a=i?t:n(t,e);o.length&&this.updateHoverStyle(o,s.mode,!1),a.length&&s.mode&&this.updateHoverStyle(a,s.mode,!0)}_eventHandler(t,e){const i={event:t,replay:e,cancelable:!0,inChartArea:this.isPointInArea(t)},s=e=>(e.options.events||this.options.events).includes(t.native.type);if(!1===this.notifyPlugins("beforeEvent",i,s))return;const n=this._handleEvent(t,e,i.inChartArea);return i.cancelable=!1,this.notifyPlugins("afterEvent",i,s),(n||i.changed)&&this.render(),this}_handleEvent(t,e,i){const{_active:s=[],options:n}=this,o=e,a=this._getActiveElements(t,s,i,o),r=D(t),l=function(t,e,i,s){return i&&"mouseout"!==t.type?s?e:t:null}(t,this._lastEvent,i,r);i&&(this._lastEvent=null,d(n.onHover,[t,a,this],this),r&&d(n.onClick,[t,a,this],this));const h=!f(a,s);return(h||e)&&(this._active=a,this._updateHoverStyles(a,s,e)),this._lastEvent=l,h}_getActiveElements(t,e,i,s){if("mouseout"===t.type)return[];if(!i)return e;const n=this.options.hover;return this.getElementsAtEventForMode(t,n.mode,n,s)}}function Ln(){return u(Tn.instances,(t=>t._plugins.invalidate()))}function En(){throw new Error("This method is not implemented: Check that a complete date adapter is provided.")}class Rn{static override(t){Object.assign(Rn.prototype,t)}options;constructor(t){this.options=t||{}}init(){}formats(){return En()}parse(){return En()}format(){return En()}add(){return En()}diff(){return En()}startOf(){return En()}endOf(){return En()}}var In={_date:Rn};function zn(t){const e=t.iScale,i=function(t,e){if(!t._cache.$bar){const i=t.getMatchingVisibleMetas(e);let s=[];for(let e=0,n=i.length;et-e)))}return t._cache.$bar}(e,t.type);let s,n,o,a,r=e._length;const l=()=>{32767!==o&&-32768!==o&&(k(a)&&(r=Math.min(r,Math.abs(o-a)||r)),a=o)};for(s=0,n=i.length;sMath.abs(r)&&(l=r,h=a),e[i.axis]=h,e._custom={barStart:l,barEnd:h,start:n,end:o,min:a,max:r}}(t,e,i,s):e[i.axis]=i.parse(t,s),e}function Vn(t,e,i,s){const n=t.iScale,o=t.vScale,a=n.getLabels(),r=n===o,l=[];let h,c,d,u;for(h=i,c=i+s;ht.x,i="left",s="right"):(e=t.base"spacing"!==t,_indexable:t=>"spacing"!==t&&!t.startsWith("borderDash")&&!t.startsWith("hoverBorderDash")};static overrides={aspectRatio:1,plugins:{legend:{labels:{generateLabels(t){const e=t.data,{labels:{pointStyle:i,textAlign:s,color:n,useBorderRadius:o,borderRadius:a}}=t.legend.options;return e.labels.length&&e.datasets.length?e.labels.map(((e,r)=>{const l=t.getDatasetMeta(0).controller.getStyle(r);return{text:e,fillStyle:l.backgroundColor,fontColor:n,hidden:!t.getDataVisibility(r),lineDash:l.borderDash,lineDashOffset:l.borderDashOffset,lineJoin:l.borderJoinStyle,lineWidth:l.borderWidth,strokeStyle:l.borderColor,textAlign:s,pointStyle:i,borderRadius:o&&(a||l.borderRadius),index:r}})):[]}},onClick(t,e,i){i.chart.toggleDataVisibility(e.index),i.chart.update()}}}};constructor(t,e){super(t,e),this.enableOptionSharing=!0,this.innerRadius=void 0,this.outerRadius=void 0,this.offsetX=void 0,this.offsetY=void 0}linkScales(){}parse(t,e){const i=this.getDataset().data,s=this._cachedMeta;if(!1===this._parsing)s._parsed=i;else{let n,a,r=t=>+i[t];if(o(i[t])){const{key:t="value"}=this._parsing;r=e=>+M(i[e],t)}for(n=t,a=t+e;nJ(t,r,l,!0)?1:Math.max(e,e*i,s,s*i),g=(t,e,s)=>J(t,r,l,!0)?-1:Math.min(e,e*i,s,s*i),p=f(0,h,d),m=f(E,c,u),x=g(C,h,d),b=g(C+E,c,u);s=(p-x)/2,n=(m-b)/2,o=-(p+x)/2,a=-(m+b)/2}return{ratioX:s,ratioY:n,offsetX:o,offsetY:a}}(u,d,r),x=(i.width-o)/f,b=(i.height-o)/g,_=Math.max(Math.min(x,b)/2,0),y=c(this.options.radius,_),v=(y-Math.max(y*r,0))/this._getVisibleDatasetWeightTotal();this.offsetX=p*y,this.offsetY=m*y,s.total=this.calculateTotal(),this.outerRadius=y-v*this._getRingWeightOffset(this.index),this.innerRadius=Math.max(this.outerRadius-v*l,0),this.updateElements(n,0,n.length,t)}_circumference(t,e){const i=this.options,s=this._cachedMeta,n=this._getCircumference();return e&&i.animation.animateRotate||!this.chart.getDataVisibility(t)||null===s._parsed[t]||s.data[t].hidden?0:this.calculateCircumference(s._parsed[t]*n/O)}updateElements(t,e,i,s){const n="reset"===s,o=this.chart,a=o.chartArea,r=o.options.animation,l=(a.left+a.right)/2,h=(a.top+a.bottom)/2,c=n&&r.animateScale,d=c?0:this.innerRadius,u=c?0:this.outerRadius,{sharedOptions:f,includeOptions:g}=this._getSharedOptions(e,s);let p,m=this._getRotation();for(p=0;p0&&!isNaN(t)?O*(Math.abs(t)/e):0}getLabelAndValue(t){const e=this._cachedMeta,i=this.chart,s=i.data.labels||[],n=ne(e._parsed[t],i.options.locale);return{label:s[t]||"",value:n}}getMaxBorderWidth(t){let e=0;const i=this.chart;let s,n,o,a,r;if(!t)for(s=0,n=i.data.datasets.length;s{const o=t.getDatasetMeta(0).controller.getStyle(n);return{text:e,fillStyle:o.backgroundColor,strokeStyle:o.borderColor,fontColor:s,lineWidth:o.borderWidth,pointStyle:i,hidden:!t.getDataVisibility(n),index:n}}))}return[]}},onClick(t,e,i){i.chart.toggleDataVisibility(e.index),i.chart.update()}}},scales:{r:{type:"radialLinear",angleLines:{display:!1},beginAtZero:!0,grid:{circular:!0},pointLabels:{display:!1},startAngle:0}}};constructor(t,e){super(t,e),this.innerRadius=void 0,this.outerRadius=void 0}getLabelAndValue(t){const e=this._cachedMeta,i=this.chart,s=i.data.labels||[],n=ne(e._parsed[t].r,i.options.locale);return{label:s[t]||"",value:n}}parseObjectData(t,e,i,s){return ii.bind(this)(t,e,i,s)}update(t){const e=this._cachedMeta.data;this._updateRadius(),this.updateElements(e,0,e.length,t)}getMinMax(){const t=this._cachedMeta,e={min:Number.POSITIVE_INFINITY,max:Number.NEGATIVE_INFINITY};return t.data.forEach(((t,i)=>{const s=this.getParsed(i).r;!isNaN(s)&&this.chart.getDataVisibility(i)&&(se.max&&(e.max=s))})),e}_updateRadius(){const t=this.chart,e=t.chartArea,i=t.options,s=Math.min(e.right-e.left,e.bottom-e.top),n=Math.max(s/2,0),o=(n-Math.max(i.cutoutPercentage?n/100*i.cutoutPercentage:1,0))/t.getVisibleDatasetCount();this.outerRadius=n-o*this.index,this.innerRadius=this.outerRadius-o}updateElements(t,e,i,s){const n="reset"===s,o=this.chart,a=o.options.animation,r=this._cachedMeta.rScale,l=r.xCenter,h=r.yCenter,c=r.getIndexAngle(0)-.5*C;let d,u=c;const f=360/this.countVisibleElements();for(d=0;d{!isNaN(this.getParsed(i).r)&&this.chart.getDataVisibility(i)&&e++})),e}_computeAngle(t,e,i){return this.chart.getDataVisibility(t)?$(this.resolveDataElementOptions(t,e).angle||i):0}}var Un=Object.freeze({__proto__:null,BarController:class extends js{static id="bar";static defaults={datasetElementType:!1,dataElementType:"bar",categoryPercentage:.8,barPercentage:.9,grouped:!0,animations:{numbers:{type:"number",properties:["x","y","base","width","height"]}}};static overrides={scales:{_index_:{type:"category",offset:!0,grid:{offset:!0}},_value_:{type:"linear",beginAtZero:!0}}};parsePrimitiveData(t,e,i,s){return Vn(t,e,i,s)}parseArrayData(t,e,i,s){return Vn(t,e,i,s)}parseObjectData(t,e,i,s){const{iScale:n,vScale:o}=t,{xAxisKey:a="x",yAxisKey:r="y"}=this._parsing,l="x"===n.axis?a:r,h="x"===o.axis?a:r,c=[];let d,u,f,g;for(d=i,u=i+s;dt.controller.options.grouped)),o=i.options.stacked,a=[],r=this._cachedMeta.controller.getParsed(e),l=r&&r[i.axis],h=t=>{const e=t._parsed.find((t=>t[i.axis]===l)),n=e&&e[t.vScale.axis];if(s(n)||isNaN(n))return!0};for(const i of n)if((void 0===e||!h(i))&&((!1===o||-1===a.indexOf(i.stack)||void 0===o&&void 0===i.stack)&&a.push(i.stack),i.index===t))break;return a.length||a.push(void 0),a}_getStackCount(t){return this._getStacks(void 0,t).length}_getAxisCount(){return this._getAxis().length}getFirstScaleIdForIndexAxis(){const t=this.chart.scales,e=this.chart.options.indexAxis;return Object.keys(t).filter((i=>t[i].axis===e)).shift()}_getAxis(){const t={},e=this.getFirstScaleIdForIndexAxis();for(const i of this.chart.data.datasets)t[l("x"===this.chart.options.indexAxis?i.xAxisID:i.yAxisID,e)]=!0;return Object.keys(t)}_getStackIndex(t,e,i){const s=this._getStacks(t,i),n=void 0!==e?s.indexOf(e):-1;return-1===n?s.length-1:n}_getRuler(){const t=this.options,e=this._cachedMeta,i=e.iScale,s=[];let n,o;for(n=0,o=e.data.length;n=i?1:-1)}(u,e,r)*a,f===r&&(x-=u/2);const t=e.getPixelForDecimal(0),s=e.getPixelForDecimal(1),o=Math.min(t,s),h=Math.max(t,s);x=Math.max(Math.min(x,h),o),d=x+u,i&&!c&&(l._stacks[e.axis]._visualValues[n]=e.getValueForPixel(d)-e.getValueForPixel(x))}if(x===e.getPixelForValue(r)){const t=F(u)*e.getLineWidthForValue(r)/2;x+=t,u-=t}return{size:u,base:x,head:d,center:d+u/2}}_calculateBarIndexPixels(t,e){const i=e.scale,n=this.options,o=n.skipNull,a=l(n.maxBarThickness,1/0);let r,h;const c=this._getAxisCount();if(e.grouped){const i=o?this._getStackCount(t):e.stackCount,d="flex"===n.barThickness?function(t,e,i,s){const n=e.pixels,o=n[t];let a=t>0?n[t-1]:null,r=t=0;--i)e=Math.max(e,t[i].size(this.resolveDataElementOptions(i))/2);return e>0&&e}getLabelAndValue(t){const e=this._cachedMeta,i=this.chart.data.labels||[],{xScale:s,yScale:n}=e,o=this.getParsed(t),a=s.getLabelForValue(o.x),r=n.getLabelForValue(o.y),l=o._custom;return{label:i[t]||"",value:"("+a+", "+r+(l?", "+l:"")+")"}}update(t){const e=this._cachedMeta.data;this.updateElements(e,0,e.length,t)}updateElements(t,e,i,s){const n="reset"===s,{iScale:o,vScale:a}=this._cachedMeta,{sharedOptions:r,includeOptions:l}=this._getSharedOptions(e,s),h=o.axis,c=a.axis;for(let d=e;d0&&this.getParsed(e-1);for(let i=0;i<_;++i){const g=t[i],_=x?g:{};if(i=b){_.skip=!0;continue}const v=this.getParsed(i),M=s(v[f]),w=_[u]=a.getPixelForValue(v[u],i),k=_[f]=o||M?r.getBasePixel():r.getPixelForValue(l?this.applyStack(r,v,l):v[f],i);_.skip=isNaN(w)||isNaN(k)||M,_.stop=i>0&&Math.abs(v[u]-y[u])>m,p&&(_.parsed=v,_.raw=h.data[i]),d&&(_.options=c||this.resolveDataElementOptions(i,g.active?"active":n)),x||this.updateElement(g,i,_,n),y=v}}getMaxOverflow(){const t=this._cachedMeta,e=t.dataset,i=e.options&&e.options.borderWidth||0,s=t.data||[];if(!s.length)return i;const n=s[0].size(this.resolveDataElementOptions(0)),o=s[s.length-1].size(this.resolveDataElementOptions(s.length-1));return Math.max(i,n,o)/2}draw(){const t=this._cachedMeta;t.dataset.updateControlPoints(this.chart.chartArea,t.iScale.axis),super.draw()}},PieController:class extends $n{static id="pie";static defaults={cutout:0,rotation:0,circumference:360,radius:"100%"}},PolarAreaController:Yn,RadarController:class extends js{static id="radar";static 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qn(t,e,i,s){return{x:i+t*Math.cos(e),y:s+t*Math.sin(e)}}function Kn(t,e,i,s,n,o){const{x:a,y:r,startAngle:l,pixelMargin:h,innerRadius:c}=e,d=Math.max(e.outerRadius+s+i-h,0),u=c>0?c+s+i+h:0;let f=0;const g=n-l;if(s){const t=((c>0?c-s:0)+(d>0?d-s:0))/2;f=(g-(0!==t?g*t/(t+s):g))/2}const p=(g-Math.max(.001,g*d-i/C)/d)/2,m=l+p+f,x=n-p-f,{outerStart:b,outerEnd:_,innerStart:y,innerEnd:v}=Xn(e,u,d,x-m),M=d-b,w=d-_,k=m+b/M,S=x-_/w,P=u+y,D=u+v,O=m+y/P,A=x-v/D;if(t.beginPath(),o){const e=(k+S)/2;if(t.arc(a,r,d,k,e),t.arc(a,r,d,e,S),_>0){const e=qn(w,S,a,r);t.arc(e.x,e.y,_,S,x+E)}const i=qn(D,x,a,r);if(t.lineTo(i.x,i.y),v>0){const e=qn(D,A,a,r);t.arc(e.x,e.y,v,x+E,A+Math.PI)}const s=(x-v/u+(m+y/u))/2;if(t.arc(a,r,u,x-v/u,s,!0),t.arc(a,r,u,s,m+y/u,!0),y>0){const e=qn(P,O,a,r);t.arc(e.x,e.y,y,O+Math.PI,m-E)}const n=qn(M,m,a,r);if(t.lineTo(n.x,n.y),b>0){const e=qn(M,k,a,r);t.arc(e.x,e.y,b,m-E,k)}}else{t.moveTo(a,r);const e=Math.cos(k)*d+a,i=Math.sin(k)*d+r;t.lineTo(e,i);const s=Math.cos(S)*d+a,n=Math.sin(S)*d+r;t.lineTo(s,n)}t.closePath()}function Gn(t,e,i,s,n){const{fullCircles:o,startAngle:a,circumference:r,options:l}=e,{borderWidth:h,borderJoinStyle:c,borderDash:d,borderDashOffset:u,borderRadius:f}=l,g="inner"===l.borderAlign;if(!h)return;t.setLineDash(d||[]),t.lineDashOffset=u,g?(t.lineWidth=2*h,t.lineJoin=c||"round"):(t.lineWidth=h,t.lineJoin=c||"bevel");let p=e.endAngle;if(o){Kn(t,e,i,s,p,n);for(let e=0;en?(h=n/l,t.arc(o,a,l,i+h,s-h,!0)):t.arc(o,a,n,i+E,s-E),t.closePath(),t.clip()}(t,e,p),l.selfJoin&&p-a>=C&&0===f&&"miter"!==c&&function(t,e,i){const{startAngle:s,x:n,y:o,outerRadius:a,innerRadius:r,options:l}=e,{borderWidth:h,borderJoinStyle:c}=l,d=Math.min(h/a,G(s-i));if(t.beginPath(),t.arc(n,o,a-h/2,s+d/2,i-d/2),r>0){const e=Math.min(h/r,G(s-i));t.arc(n,o,r+h/2,i-e/2,s+e/2,!0)}else{const e=Math.min(h/2,a*G(s-i));if("round"===c)t.arc(n,o,e,i-C/2,s+C/2,!0);else if("bevel"===c){const a=2*e*e,r=-a*Math.cos(i+C/2)+n,l=-a*Math.sin(i+C/2)+o,h=a*Math.cos(s+C/2)+n,c=a*Math.sin(s+C/2)+o;t.lineTo(r,l),t.lineTo(h,c)}}t.closePath(),t.moveTo(0,0),t.rect(0,0,t.canvas.width,t.canvas.height),t.clip("evenodd")}(t,e,p),o||(Kn(t,e,i,s,p,n),t.stroke())}function Jn(t,e,i=e){t.lineCap=l(i.borderCapStyle,e.borderCapStyle),t.setLineDash(l(i.borderDash,e.borderDash)),t.lineDashOffset=l(i.borderDashOffset,e.borderDashOffset),t.lineJoin=l(i.borderJoinStyle,e.borderJoinStyle),t.lineWidth=l(i.borderWidth,e.borderWidth),t.strokeStyle=l(i.borderColor,e.borderColor)}function Zn(t,e,i){t.lineTo(i.x,i.y)}function Qn(t,e,i={}){const s=t.length,{start:n=0,end:o=s-1}=i,{start:a,end:r}=e,l=Math.max(n,a),h=Math.min(o,r),c=nr&&o>r;return{count:s,start:l,loop:e.loop,ilen:h(a+(h?r-t:t))%o,_=()=>{f!==g&&(t.lineTo(m,g),t.lineTo(m,f),t.lineTo(m,p))};for(l&&(d=n[b(0)],t.moveTo(d.x,d.y)),c=0;c<=r;++c){if(d=n[b(c)],d.skip)continue;const 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descriptors={_scriptable:!0,_indexable:t=>"borderDash"!==t&&"fill"!==t};constructor(t){super(),this.animated=!0,this.options=void 0,this._chart=void 0,this._loop=void 0,this._fullLoop=void 0,this._path=void 0,this._points=void 0,this._segments=void 0,this._decimated=!1,this._pointsUpdated=!1,this._datasetIndex=void 0,t&&Object.assign(this,t)}updateControlPoints(t,e){const i=this.options;if((i.tension||"monotone"===i.cubicInterpolationMode)&&!i.stepped&&!this._pointsUpdated){const s=i.spanGaps?this._loop:this._fullLoop;hi(this._points,i,t,s,e),this._pointsUpdated=!0}}set points(t){this._points=t,delete this._segments,delete this._path,this._pointsUpdated=!1}get points(){return this._points}get segments(){return this._segments||(this._segments=zi(this,this.options.segment))}first(){const t=this.segments,e=this.points;return t.length&&e[t[0].start]}last(){const t=this.segments,e=this.points,i=t.length;return i&&e[t[i-1].end]}interpolate(t,e){const 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p&&m}getCenterPoint(t){const{x:e,y:i,startAngle:s,endAngle:n,innerRadius:o,outerRadius:a}=this.getProps(["x","y","startAngle","endAngle","innerRadius","outerRadius"],t),{offset:r,spacing:l}=this.options,h=(s+n)/2,c=(o+a+l+r)/2;return{x:e+Math.cos(h)*c,y:i+Math.sin(h)*c}}tooltipPosition(t){return this.getCenterPoint(t)}draw(t){const{options:e,circumference:i}=this,s=(e.offset||0)/4,n=(e.spacing||0)/2,o=e.circular;if(this.pixelMargin="inner"===e.borderAlign?.33:0,this.fullCircles=i>O?Math.floor(i/O):0,0===i||this.innerRadius<0||this.outerRadius<0)return;t.save();const a=(this.startAngle+this.endAngle)/2;t.translate(Math.cos(a)*s,Math.sin(a)*s);const r=s*(1-Math.sin(Math.min(C,i||0)));t.fillStyle=e.backgroundColor,t.strokeStyle=e.borderColor,function(t,e,i,s,n){const{fullCircles:o,startAngle:a,circumference:r}=e;let l=e.endAngle;if(o){Kn(t,e,i,s,l,n);for(let e=0;e("string"==typeof e?(i=t.push(e)-1,s.unshift({index:i,label:e})):isNaN(e)&&(i=null),i))(t,e,i,s);return 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a(i)&&i>0?i:null;this._zero=!0}determineDataLimits(){const{min:t,max:e}=this.getMinMax(!0);this.min=a(t)?Math.max(0,t):null,this.max=a(e)?Math.max(0,e):null,this.options.beginAtZero&&(this._zero=!0),this._zero&&this.min!==this._suggestedMin&&!a(this._userMin)&&(this.min=t===vo(this.min,0)?vo(this.min,-1):vo(this.min,0)),this.handleTickRangeOptions()}handleTickRangeOptions(){const{minDefined:t,maxDefined:e}=this.getUserBounds();let i=this.min,s=this.max;const n=e=>i=t?i:e,o=t=>s=e?s:t;i===s&&(i<=0?(n(1),o(10)):(n(vo(i,-1)),o(vo(s,1)))),i<=0&&n(vo(s,-1)),s<=0&&o(vo(i,1)),this.min=i,this.max=s}buildTicks(){const t=this.options,e=ko({min:this._userMin,max:this._userMax},this);return"ticks"===t.bounds&&j(e,this,"value"),t.reverse?(e.reverse(),this.start=this.max,this.end=this.min):(this.start=this.min,this.end=this.max),e}getLabelForValue(t){return void 0===t?"0":ne(t,this.chart.options.locale,this.options.ticks.format)}configure(){const t=this.min;super.configure(),this._startValue=z(t),this._valueRange=z(this.max)-z(t)}getPixelForValue(t){return void 0!==t&&0!==t||(t=this.min),null===t||isNaN(t)?NaN:this.getPixelForDecimal(t===this.min?0:(z(t)-this._startValue)/this._valueRange)}getValueForPixel(t){const e=this.getDecimalForPixel(t);return Math.pow(10,this._startValue+e*this._valueRange)}}function Po(t){const e=t.ticks;if(e.display&&t.display){const t=ki(e.backdropPadding);return l(e.font&&e.font.size,ue.font.size)+t.height}return 0}function Do(t,e,i,s,n){return t===s||t===n?{start:e-i/2,end:e+i/2}:tn?{start:e-i,end:e}:{start:e,end:e+i}}function Co(t){const e={l:t.left+t._padding.left,r:t.right-t._padding.right,t:t.top+t._padding.top,b:t.bottom-t._padding.bottom},i=Object.assign({},e),s=[],o=[],a=t._pointLabels.length,r=t.options.pointLabels,l=r.centerPointLabels?C/a:0;for(let u=0;ue.r&&(r=(s.end-e.r)/o,t.r=Math.max(t.r,e.r+r)),n.starte.b&&(l=(n.end-e.b)/a,t.b=Math.max(t.b,e.b+l))}function Ao(t,e,i){const s=t.drawingArea,{extra:n,additionalAngle:o,padding:a,size:r}=i,l=t.getPointPosition(e,s+n+a,o),h=Math.round(Y(G(l.angle+E))),c=function(t,e,i){90===i||270===i?t-=e/2:(i>270||i<90)&&(t-=e);return t}(l.y,r.h,h),d=function(t){if(0===t||180===t)return"center";if(t<180)return"left";return"right"}(h),u=function(t,e,i){"right"===i?t-=e:"center"===i&&(t-=e/2);return t}(l.x,r.w,d);return{visible:!0,x:l.x,y:c,textAlign:d,left:u,top:c,right:u+r.w,bottom:c+r.h}}function To(t,e){if(!e)return!0;const{left:i,top:s,right:n,bottom:o}=t;return!(Re({x:i,y:s},e)||Re({x:i,y:o},e)||Re({x:n,y:s},e)||Re({x:n,y:o},e))}function Lo(t,e,i){const{left:n,top:o,right:a,bottom:r}=i,{backdropColor:l}=e;if(!s(l)){const i=wi(e.borderRadius),s=ki(e.backdropPadding);t.fillStyle=l;const h=n-s.left,c=o-s.top,d=a-n+s.width,u=r-o+s.height;Object.values(i).some((t=>0!==t))?(t.beginPath(),He(t,{x:h,y:c,w:d,h:u,radius:i}),t.fill()):t.fillRect(h,c,d,u)}}function Eo(t,e,i,s){const{ctx:n}=t;if(i)n.arc(t.xCenter,t.yCenter,e,0,O);else{let i=t.getPointPosition(0,e);n.moveTo(i.x,i.y);for(let o=1;ot,padding:5,centerPointLabels:!1}};static defaultRoutes={"angleLines.color":"borderColor","pointLabels.color":"color","ticks.color":"color"};static descriptors={angleLines:{_fallback:"grid"}};constructor(t){super(t),this.xCenter=void 0,this.yCenter=void 0,this.drawingArea=void 0,this._pointLabels=[],this._pointLabelItems=[]}setDimensions(){const t=this._padding=ki(Po(this.options)/2),e=this.width=this.maxWidth-t.width,i=this.height=this.maxHeight-t.height;this.xCenter=Math.floor(this.left+e/2+t.left),this.yCenter=Math.floor(this.top+i/2+t.top),this.drawingArea=Math.floor(Math.min(e,i)/2)}determineDataLimits(){const{min:t,max:e}=this.getMinMax(!1);this.min=a(t)&&!isNaN(t)?t:0,this.max=a(e)&&!isNaN(e)?e:0,this.handleTickRangeOptions()}computeTickLimit(){return Math.ceil(this.drawingArea/Po(this.options))}generateTickLabels(t){bo.prototype.generateTickLabels.call(this,t),this._pointLabels=this.getLabels().map(((t,e)=>{const i=d(this.options.pointLabels.callback,[t,e],this);return i||0===i?i:""})).filter(((t,e)=>this.chart.getDataVisibility(e)))}fit(){const t=this.options;t.display&&t.pointLabels.display?Co(this):this.setCenterPoint(0,0,0,0)}setCenterPoint(t,e,i,s){this.xCenter+=Math.floor((t-e)/2),this.yCenter+=Math.floor((i-s)/2),this.drawingArea-=Math.min(this.drawingArea/2,Math.max(t,e,i,s))}getIndexAngle(t){return G(t*(O/(this._pointLabels.length||1))+$(this.options.startAngle||0))}getDistanceFromCenterForValue(t){if(s(t))return NaN;const e=this.drawingArea/(this.max-this.min);return this.options.reverse?(this.max-t)*e:(t-this.min)*e}getValueForDistanceFromCenter(t){if(s(t))return NaN;const e=t/(this.drawingArea/(this.max-this.min));return this.options.reverse?this.max-e:this.min+e}getPointLabelContext(t){const e=this._pointLabels||[];if(t>=0&&t=0;n--){const e=t._pointLabelItems[n];if(!e.visible)continue;const o=s.setContext(t.getPointLabelContext(n));Lo(i,o,e);const a=Si(o.font),{x:r,y:l,textAlign:h}=e;Ne(i,t._pointLabels[n],r,l+a.lineHeight/2,a,{color:o.color,textAlign:h,textBaseline:"middle"})}}(this,o),s.display&&this.ticks.forEach(((t,e)=>{if(0!==e||0===e&&this.min<0){r=this.getDistanceFromCenterForValue(t.value);const i=this.getContext(e),a=s.setContext(i),l=n.setContext(i);!function(t,e,i,s,n){const o=t.ctx,a=e.circular,{color:r,lineWidth:l}=e;!a&&!s||!r||!l||i<0||(o.save(),o.strokeStyle=r,o.lineWidth=l,o.setLineDash(n.dash||[]),o.lineDashOffset=n.dashOffset,o.beginPath(),Eo(t,i,a,s),o.closePath(),o.stroke(),o.restore())}(this,a,r,o,l)}})),i.display){for(t.save(),a=o-1;a>=0;a--){const s=i.setContext(this.getPointLabelContext(a)),{color:n,lineWidth:o}=s;o&&n&&(t.lineWidth=o,t.strokeStyle=n,t.setLineDash(s.borderDash),t.lineDashOffset=s.borderDashOffset,r=this.getDistanceFromCenterForValue(e.reverse?this.min:this.max),l=this.getPointPosition(a,r),t.beginPath(),t.moveTo(this.xCenter,this.yCenter),t.lineTo(l.x,l.y),t.stroke())}t.restore()}}drawBorder(){}drawLabels(){const t=this.ctx,e=this.options,i=e.ticks;if(!i.display)return;const s=this.getIndexAngle(0);let n,o;t.save(),t.translate(this.xCenter,this.yCenter),t.rotate(s),t.textAlign="center",t.textBaseline="middle",this.ticks.forEach(((s,a)=>{if(0===a&&this.min>=0&&!e.reverse)return;const r=i.setContext(this.getContext(a)),l=Si(r.font);if(n=this.getDistanceFromCenterForValue(this.ticks[a].value),r.showLabelBackdrop){t.font=l.string,o=t.measureText(s.label).width,t.fillStyle=r.backdropColor;const e=ki(r.backdropPadding);t.fillRect(-o/2-e.left,-n-l.size/2-e.top,o+e.width,l.size+e.height)}Ne(t,s.label,0,-n,l,{color:r.color,strokeColor:r.textStrokeColor,strokeWidth:r.textStrokeWidth})})),t.restore()}drawTitle(){}}const Io={millisecond:{common:!0,size:1,steps:1e3},second:{common:!0,size:1e3,steps:60},minute:{common:!0,size:6e4,steps:60},hour:{common:!0,size:36e5,steps:24},day:{common:!0,size:864e5,steps:30},week:{common:!1,size:6048e5,steps:4},month:{common:!0,size:2628e6,steps:12},quarter:{common:!1,size:7884e6,steps:4},year:{common:!0,size:3154e7}},zo=Object.keys(Io);function Fo(t,e){return t-e}function Vo(t,e){if(s(e))return null;const i=t._adapter,{parser:n,round:o,isoWeekday:r}=t._parseOpts;let l=e;return"function"==typeof n&&(l=n(l)),a(l)||(l="string"==typeof n?i.parse(l,n):i.parse(l)),null===l?null:(o&&(l="week"!==o||!N(r)&&!0!==r?i.startOf(l,o):i.startOf(l,"isoWeek",r)),+l)}function Bo(t,e,i,s){const n=zo.length;for(let o=zo.indexOf(t);o=e?i[s]:i[n]]=!0}}else 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aa(t,e,i){let s=t[e].fill;const n=[e];let o;if(!i)return s;for(;!1!==s&&-1===n.indexOf(s);){if(!a(s))return s;if(o=t[s],!o)return!1;if(o.visible)return s;n.push(s),s=o.fill}return!1}function ra(t,e,i){const s=function(t){const e=t.options,i=e.fill;let s=l(i&&i.target,i);void 0===s&&(s=!!e.backgroundColor);if(!1===s||null===s)return!1;if(!0===s)return"origin";return s}(t);if(o(s))return!isNaN(s.value)&&s;let n=parseFloat(s);return a(n)&&Math.floor(n)===n?function(t,e,i,s){"-"!==t&&"+"!==t||(i=e+i);if(i===e||i<0||i>=s)return!1;return i}(s[0],e,n,i):["origin","start","end","stack","shape"].indexOf(s)>=0&&s}function la(t,e,i){const s=[];for(let n=0;n=0;--e){const i=n[e].$filler;i&&(i.line.updateControlPoints(o,i.axis),s&&i.fill&&ua(t.ctx,i,o))}},beforeDatasetsDraw(t,e,i){if("beforeDatasetsDraw"!==i.drawTime)return;const s=t.getSortedVisibleDatasetMetas();for(let e=s.length-1;e>=0;--e){const i=s[e].$filler;oa(i)&&ua(t.ctx,i,t.chartArea)}},beforeDatasetDraw(t,e,i){const s=e.meta.$filler;oa(s)&&"beforeDatasetDraw"===i.drawTime&&ua(t.ctx,s,t.chartArea)},defaults:{propagate:!0,drawTime:"beforeDatasetDraw"}};const _a=(t,e)=>{let{boxHeight:i=e,boxWidth:s=e}=t;return t.usePointStyle&&(i=Math.min(i,e),s=t.pointStyleWidth||Math.min(s,e)),{boxWidth:s,boxHeight:i,itemHeight:Math.max(e,i)}};class ya extends $s{constructor(t){super(),this._added=!1,this.legendHitBoxes=[],this._hoveredItem=null,this.doughnutMode=!1,this.chart=t.chart,this.options=t.options,this.ctx=t.ctx,this.legendItems=void 0,this.columnSizes=void 0,this.lineWidths=void 0,this.maxHeight=void 0,this.maxWidth=void 0,this.top=void 0,this.bottom=void 0,this.left=void 0,this.right=void 0,this.height=void 0,this.width=void 0,this._margins=void 0,this.position=void 0,this.weight=void 0,this.fullSize=void 0}update(t,e,i){this.maxWidth=t,this.maxHeight=e,this._margins=i,this.setDimensions(),this.buildLabels(),this.fit()}setDimensions(){this.isHorizontal()?(this.width=this.maxWidth,this.left=this._margins.left,this.right=this.width):(this.height=this.maxHeight,this.top=this._margins.top,this.bottom=this.height)}buildLabels(){const t=this.options.labels||{};let e=d(t.generateLabels,[this.chart],this)||[];t.filter&&(e=e.filter((e=>t.filter(e,this.chart.data)))),t.sort&&(e=e.sort(((e,i)=>t.sort(e,i,this.chart.data)))),this.options.reverse&&e.reverse(),this.legendItems=e}fit(){const{options:t,ctx:e}=this;if(!t.display)return void(this.width=this.height=0);const i=t.labels,s=Si(i.font),n=s.size,o=this._computeTitleHeight(),{boxWidth:a,itemHeight:r}=_a(i,n);let l,h;e.font=s.string,this.isHorizontal()?(l=this.maxWidth,h=this._fitRows(o,n,a,r)+10):(h=this.maxHeight,l=this._fitCols(o,s,a,r)+10),this.width=Math.min(l,t.maxWidth||this.maxWidth),this.height=Math.min(h,t.maxHeight||this.maxHeight)}_fitRows(t,e,i,s){const{ctx:n,maxWidth:o,options:{labels:{padding:a}}}=this,r=this.legendHitBoxes=[],l=this.lineWidths=[0],h=s+a;let c=t;n.textAlign="left",n.textBaseline="middle";let d=-1,u=-h;return this.legendItems.forEach(((t,f)=>{const g=i+e/2+n.measureText(t.text).width;(0===f||l[l.length-1]+g+2*a>o)&&(c+=h,l[l.length-(f>0?0:1)]=0,u+=h,d++),r[f]={left:0,top:u,row:d,width:g,height:s},l[l.length-1]+=g+a})),c}_fitCols(t,e,i,s){const{ctx:n,maxHeight:o,options:{labels:{padding:a}}}=this,r=this.legendHitBoxes=[],l=this.columnSizes=[],h=o-t;let c=a,d=0,u=0,f=0,g=0;return this.legendItems.forEach(((t,o)=>{const{itemWidth:p,itemHeight:m}=function(t,e,i,s,n){const o=function(t,e,i,s){let n=t.text;n&&"string"!=typeof n&&(n=n.reduce(((t,e)=>t.length>e.length?t:e)));return e+i.size/2+s.measureText(n).width}(s,t,e,i),a=function(t,e,i){let s=t;"string"!=typeof e.text&&(s=va(e,i));return s}(n,s,e.lineHeight);return{itemWidth:o,itemHeight:a}}(i,e,n,t,s);o>0&&u+m+2*a>h&&(c+=d+a,l.push({width:d,height:u}),f+=d+a,g++,d=u=0),r[o]={left:f,top:u,col:g,width:p,height:m},d=Math.max(d,p),u+=m+a})),c+=d,l.push({width:d,height:u}),c}adjustHitBoxes(){if(!this.options.display)return;const t=this._computeTitleHeight(),{legendHitBoxes:e,options:{align:i,labels:{padding:s},rtl:n}}=this,o=Oi(n,this.left,this.width);if(this.isHorizontal()){let n=0,a=ft(i,this.left+s,this.right-this.lineWidths[n]);for(const r of e)n!==r.row&&(n=r.row,a=ft(i,this.left+s,this.right-this.lineWidths[n])),r.top+=this.top+t+s,r.left=o.leftForLtr(o.x(a),r.width),a+=r.width+s}else{let n=0,a=ft(i,this.top+t+s,this.bottom-this.columnSizes[n].height);for(const r of e)r.col!==n&&(n=r.col,a=ft(i,this.top+t+s,this.bottom-this.columnSizes[n].height)),r.top=a,r.left+=this.left+s,r.left=o.leftForLtr(o.x(r.left),r.width),a+=r.height+s}}isHorizontal(){return"top"===this.options.position||"bottom"===this.options.position}draw(){if(this.options.display){const t=this.ctx;Ie(t,this),this._draw(),ze(t)}}_draw(){const{options:t,columnSizes:e,lineWidths:i,ctx:s}=this,{align:n,labels:o}=t,a=ue.color,r=Oi(t.rtl,this.left,this.width),h=Si(o.font),{padding:c}=o,d=h.size,u=d/2;let f;this.drawTitle(),s.textAlign=r.textAlign("left"),s.textBaseline="middle",s.lineWidth=.5,s.font=h.string;const{boxWidth:g,boxHeight:p,itemHeight:m}=_a(o,d),x=this.isHorizontal(),b=this._computeTitleHeight();f=x?{x:ft(n,this.left+c,this.right-i[0]),y:this.top+c+b,line:0}:{x:this.left+c,y:ft(n,this.top+b+c,this.bottom-e[0].height),line:0},Ai(this.ctx,t.textDirection);const _=m+c;this.legendItems.forEach(((y,v)=>{s.strokeStyle=y.fontColor,s.fillStyle=y.fontColor;const M=s.measureText(y.text).width,w=r.textAlign(y.textAlign||(y.textAlign=o.textAlign)),k=g+u+M;let S=f.x,P=f.y;r.setWidth(this.width),x?v>0&&S+k+c>this.right&&(P=f.y+=_,f.line++,S=f.x=ft(n,this.left+c,this.right-i[f.line])):v>0&&P+_>this.bottom&&(S=f.x=S+e[f.line].width+c,f.line++,P=f.y=ft(n,this.top+b+c,this.bottom-e[f.line].height));if(function(t,e,i){if(isNaN(g)||g<=0||isNaN(p)||p<0)return;s.save();const n=l(i.lineWidth,1);if(s.fillStyle=l(i.fillStyle,a),s.lineCap=l(i.lineCap,"butt"),s.lineDashOffset=l(i.lineDashOffset,0),s.lineJoin=l(i.lineJoin,"miter"),s.lineWidth=n,s.strokeStyle=l(i.strokeStyle,a),s.setLineDash(l(i.lineDash,[])),o.usePointStyle){const a={radius:p*Math.SQRT2/2,pointStyle:i.pointStyle,rotation:i.rotation,borderWidth:n},l=r.xPlus(t,g/2);Ee(s,a,l,e+u,o.pointStyleWidth&&g)}else{const o=e+Math.max((d-p)/2,0),a=r.leftForLtr(t,g),l=wi(i.borderRadius);s.beginPath(),Object.values(l).some((t=>0!==t))?He(s,{x:a,y:o,w:g,h:p,radius:l}):s.rect(a,o,g,p),s.fill(),0!==n&&s.stroke()}s.restore()}(r.x(S),P,y),S=gt(w,S+g+u,x?S+k:this.right,t.rtl),function(t,e,i){Ne(s,i.text,t,e+m/2,h,{strikethrough:i.hidden,textAlign:r.textAlign(i.textAlign)})}(r.x(S),P,y),x)f.x+=k+c;else if("string"!=typeof y.text){const t=h.lineHeight;f.y+=va(y,t)+c}else f.y+=_})),Ti(this.ctx,t.textDirection)}drawTitle(){const t=this.options,e=t.title,i=Si(e.font),s=ki(e.padding);if(!e.display)return;const n=Oi(t.rtl,this.left,this.width),o=this.ctx,a=e.position,r=i.size/2,l=s.top+r;let h,c=this.left,d=this.width;if(this.isHorizontal())d=Math.max(...this.lineWidths),h=this.top+l,c=ft(t.align,c,this.right-d);else{const e=this.columnSizes.reduce(((t,e)=>Math.max(t,e.height)),0);h=l+ft(t.align,this.top,this.bottom-e-t.labels.padding-this._computeTitleHeight())}const u=ft(a,c,c+d);o.textAlign=n.textAlign(ut(a)),o.textBaseline="middle",o.strokeStyle=e.color,o.fillStyle=e.color,o.font=i.string,Ne(o,e.text,u,h,i)}_computeTitleHeight(){const t=this.options.title,e=Si(t.font),i=ki(t.padding);return t.display?e.lineHeight+i.height:0}_getLegendItemAt(t,e){let i,s,n;if(tt(t,this.left,this.right)&&tt(e,this.top,this.bottom))for(n=this.legendHitBoxes,i=0;it.chart.options.color,boxWidth:40,padding:10,generateLabels(t){const e=t.data.datasets,{labels:{usePointStyle:i,pointStyle:s,textAlign:n,color:o,useBorderRadius:a,borderRadius:r}}=t.legend.options;return t._getSortedDatasetMetas().map((t=>{const l=t.controller.getStyle(i?0:void 0),h=ki(l.borderWidth);return{text:e[t.index].label,fillStyle:l.backgroundColor,fontColor:o,hidden:!t.visible,lineCap:l.borderCapStyle,lineDash:l.borderDash,lineDashOffset:l.borderDashOffset,lineJoin:l.borderJoinStyle,lineWidth:(h.width+h.height)/4,strokeStyle:l.borderColor,pointStyle:s||l.pointStyle,rotation:l.rotation,textAlign:n||l.textAlign,borderRadius:a&&(r||l.borderRadius),datasetIndex:t.index}}),this)}},title:{color:t=>t.chart.options.color,display:!1,position:"center",text:""}},descriptors:{_scriptable:t=>!t.startsWith("on"),labels:{_scriptable:t=>!["generateLabels","filter","sort"].includes(t)}}};class wa extends $s{constructor(t){super(),this.chart=t.chart,this.options=t.options,this.ctx=t.ctx,this._padding=void 0,this.top=void 0,this.bottom=void 0,this.left=void 0,this.right=void 0,this.width=void 0,this.height=void 0,this.position=void 0,this.weight=void 0,this.fullSize=void 0}update(t,e){const i=this.options;if(this.left=0,this.top=0,!i.display)return void(this.width=this.height=this.right=this.bottom=0);this.width=this.right=t,this.height=this.bottom=e;const s=n(i.text)?i.text.length:1;this._padding=ki(i.padding);const o=s*Si(i.font).lineHeight+this._padding.height;this.isHorizontal()?this.height=o:this.width=o}isHorizontal(){const t=this.options.position;return"top"===t||"bottom"===t}_drawArgs(t){const{top:e,left:i,bottom:s,right:n,options:o}=this,a=o.align;let r,l,h,c=0;return this.isHorizontal()?(l=ft(a,i,n),h=e+t,r=n-i):("left"===o.position?(l=i+t,h=ft(a,s,e),c=-.5*C):(l=n-t,h=ft(a,e,s),c=.5*C),r=s-e),{titleX:l,titleY:h,maxWidth:r,rotation:c}}draw(){const t=this.ctx,e=this.options;if(!e.display)return;const i=Si(e.font),s=i.lineHeight/2+this._padding.top,{titleX:n,titleY:o,maxWidth:a,rotation:r}=this._drawArgs(s);Ne(t,e.text,0,0,i,{color:e.color,maxWidth:a,rotation:r,textAlign:ut(e.align),textBaseline:"middle",translation:[n,o]})}}var ka={id:"title",_element:wa,start(t,e,i){!function(t,e){const i=new wa({ctx:t.ctx,options:e,chart:t});ls.configure(t,i,e),ls.addBox(t,i),t.titleBlock=i}(t,i)},stop(t){const e=t.titleBlock;ls.removeBox(t,e),delete t.titleBlock},beforeUpdate(t,e,i){const s=t.titleBlock;ls.configure(t,s,i),s.options=i},defaults:{align:"center",display:!1,font:{weight:"bold"},fullSize:!0,padding:10,position:"top",text:"",weight:2e3},defaultRoutes:{color:"color"},descriptors:{_scriptable:!0,_indexable:!1}};const Sa=new WeakMap;var Pa={id:"subtitle",start(t,e,i){const s=new wa({ctx:t.ctx,options:i,chart:t});ls.configure(t,s,i),ls.addBox(t,s),Sa.set(t,s)},stop(t){ls.removeBox(t,Sa.get(t)),Sa.delete(t)},beforeUpdate(t,e,i){const s=Sa.get(t);ls.configure(t,s,i),s.options=i},defaults:{align:"center",display:!1,font:{weight:"normal"},fullSize:!0,padding:0,position:"top",text:"",weight:1500},defaultRoutes:{color:"color"},descriptors:{_scriptable:!0,_indexable:!1}};const Da={average(t){if(!t.length)return!1;let e,i,s=new 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m=p.height,x=0,b=s.reduce(((t,e)=>t+e.before.length+e.lines.length+e.after.length),0);if(b+=t.beforeBody.length+t.afterBody.length,d&&(m+=d*h.lineHeight+(d-1)*e.titleSpacing+e.titleMarginBottom),b){m+=g*(e.displayColors?Math.max(r,l.lineHeight):l.lineHeight)+(b-g)*l.lineHeight+(b-1)*e.bodySpacing}f&&(m+=e.footerMarginTop+f*c.lineHeight+(f-1)*e.footerSpacing);let _=0;const y=function(t){x=Math.max(x,i.measureText(t).width+_)};return i.save(),i.font=h.string,u(t.title,y),i.font=l.string,u(t.beforeBody.concat(t.afterBody),y),_=e.displayColors?a+2+e.boxPadding:0,u(s,(t=>{u(t.before,y),u(t.lines,y),u(t.after,y)})),_=0,i.font=c.string,u(t.footer,y),i.restore(),x+=p.width,{width:x,height:m}}function La(t,e,i,s){const{x:n,width:o}=i,{width:a,chartArea:{left:r,right:l}}=t;let 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Tn.register(Un,$o,go,t),Tn.helpers={...Hi},Tn._adapters=In,Tn.Animation=As,Tn.Animations=Ts,Tn.animator=bt,Tn.controllers=nn.controllers.items,Tn.DatasetController=js,Tn.Element=$s,Tn.elements=go,Tn.Interaction=Ki,Tn.layouts=ls,Tn.platforms=Ds,Tn.Scale=tn,Tn.Ticks=ae,Object.assign(Tn,Un,$o,go,t,Ds),Tn.Chart=Tn,"undefined"!=typeof window&&(window.Chart=Tn),Tn})); +//# sourceMappingURL=chart.umd.min.js.map From 149d6ab4200b5b5a01460bc10036c957dcbf4b41 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Mon, 12 Oct 2026 13:33:49 +0200 Subject: [PATCH 04/17] Address sphinx review findings on rc-6/rc-7 test tooling - ReferenceChainTestHooks: consolidate debug test seams behind one package-private facade; drop public visibility of the JavaProfiler seams back to package-private - JavaProfiler: restore the mutating-state warning on shouldRunPassForTest0 javadoc; getTid javadoc corrections - referencechains tests: await handoff publication in default mode, continue hysteresis epochs past the initial seeding, keepBest() preserves in-pool correlated results, clear seeded heap-floor-ring samples and chainTargetHolder in finally, bound the allocator-tid spin-wait, seed per-(klass,tid) ramps on the allocating thread - LeakTagCorrelationReferenceChainTest: assert at least one leak-tag interception in the tight-window variant - utils/sweep-*.sh: guard parse_run pipelines with || true, fix the JDK<=16 safepoint double-count, resolve swept-knob precedence against baked-in defaults - utils/run-refchains-repro.sh: stale budget comment, knob override - build-and-summarize: headline IndexError guard, zip pairing of failure headlines, multi-count test summaries, parser failure artifacts - ReferenceChainLeakAntagonist: hoist cache.size() out of the inner loop; ReferenceChainLeakDemo: malformed-duration usage message, rotating snapshot path - refchains-report-multi.py: warn on unparsable CSV cells --- .claude/commands/build-and-summarize | 75 ++++++-- .../com/datadoghq/profiler/JavaProfiler.java | 53 ++++-- .../chaos/ReferenceChainLeakAntagonist.java | 7 +- .../repro/ReferenceChainLeakDemo.java | 55 +++++- .../profiler/JavaProfilerApiSurfaceTest.java | 28 ++- .../profiler/ReferenceChainTestHooks.java | 47 +---- .../AggressiveLeakReferenceChainTest.java | 60 +++--- .../LeakTagCorrelationReferenceChainTest.java | 27 ++- .../LeakTagCorrelationScenario.java | 110 ++++++++--- .../referencechains/LeakingCacheScenario.java | 14 +- .../ReferenceChainTestSeamsTest.java | 146 +++++++------- .../ReferenceChainTrackingTest.java | 180 ++++++++++++++---- .../StaticFieldGrowingCollectionScenario.java | 30 +-- .../ThreadLocalLeakScenario.java | 74 ++++--- utils/compare-refchains-repro.sh | 13 +- utils/refchains-report-multi.py | 8 +- utils/run-refchains-repro.sh | 37 +++- utils/sweep-refchains-all.sh | 75 ++++++-- utils/sweep-refchains-budgets.sh | 23 ++- 19 files changed, 716 insertions(+), 346 deletions(-) diff --git a/.claude/commands/build-and-summarize b/.claude/commands/build-and-summarize index 0056df710a..358803b0e1 100755 --- a/.claude/commands/build-and-summarize +++ b/.claude/commands/build-and-summarize @@ -77,7 +77,10 @@ fi # to sonnet-5 via the AI gateway, billing real money for every log parse.) echo echo "Generating gradle summary…" -python3 - "$LOG" <<'PYEOF' || echo "⚠ gradle summary generation failed — full log at: $LOG" +# A generator failure (exception, missing python3) must not leave stale or missing artifacts +# behind a successful exit: capture its rc, write an UNKNOWN pair below, and propagate the rc. +summary_rc=0 +python3 - "$LOG" <<'PYEOF' || summary_rc=$? import json, os, re, sys log_path = sys.argv[1] if len(sys.argv) > 1 else "" @@ -92,7 +95,12 @@ tests = {"total": 0, "failed": 0, "skipped": 0, "modules": {}} RE_STATUS = re.compile(r"^BUILD (SUCCESSFUL|FAILED)(?: in (.+?))?\s*$") RE_TASK = re.compile(r"^> Task (\S+)") -RE_GSUM = re.compile(r"(\d+) tests? (successful|failed|skipped)") +# A summary line may carry several counts ("N tests successful, M failed, K skipped"): RE_GSUM +# matches the whole run of counts, RE_GSUM_PART splits it so none of them is dropped. +RE_GSUM = re.compile(r"\d+ tests? (?:successful|failed|skipped)" + r"(?:,\s*\d+ (?:tests? )?(?:successful|failed|skipped))*") +RE_GSUM_PART = re.compile(r"(\d+) (?:tests? )?(successful|failed|skipped)") +RE_HL_TASK = re.compile(r"task '([^']+)'") RE_COMP = re.compile(r"(\d+) tests? completed(?:, (\d+) failed)?(?:, (\d+) skipped)?") RE_GTEST_P = re.compile(r"\[ PASSED \] (\d+) tests?") RE_GTEST_F = re.compile(r"\[ FAILED \] (\d+) tests?") @@ -115,8 +123,9 @@ if not log_path or not os.path.isfile(log_path) or os.path.getsize(log_path) == why = f"log not found: {log_path!r}" if not log_path or not os.path.isfile(log_path) else "log is empty" os.makedirs(OUT_DIR, exist_ok=True) open(MD, "w").write(f"# Gradle Summary\n\n- Status: UNKNOWN ({why})\n\nFull log unavailable or empty.\n") - json.dump({"status": "UNKNOWN", "totalTime": None, "failedTasks": [], "warnings": [], - "tests": tests, "slowTasks": [], "depIssues": [why], "actions": []}, open(JS, "w"), indent=1) + json.dump({"status": "UNKNOWN", "totalTime": None, "failedTasks": [], "primaryFailures": [], + "warnings": [], "tests": tests, "slowTasks": [], "depIssues": [why], "actions": []}, + open(JS, "w"), indent=1) print(f"Gradle log unusable ({why}); wrote {MD} and {JS}") sys.exit(0) @@ -135,11 +144,14 @@ with open(log_path, encoding="utf-8", errors="replace") as f: if line.endswith("FAILED") and m.group(1) not in failed_tasks: failed_tasks.append(m.group(1)) continue - if "FAILURE: Build failed with an exception" in line: - grab_headline = True + # Gradle prints one "* What went wrong" block per failure ("FAILURE: Build failed with + # an exception." for one, "FAILURE: Build completed with N failures." + numbered blocks + # for several), so capture a headline at every such block, not just after the banner. + if line.startswith("FAILURE: Build "): continue - if grab_headline and line.strip().startswith("* What went wrong"): + if line.strip().startswith("* What went wrong"): headlines.append("") + grab_headline = True continue if grab_headline: s = line.strip() @@ -159,16 +171,10 @@ with open(log_path, encoding="utf-8", errors="replace") as f: continue m = RE_GSUM.search(line) if m: - n, verb = int(m.group(1)), m.group(2) - mm = mod(cur_task or "(unknown)") - mm["total"] += n - tests["total"] += n - if verb == "failed": - mm["failed"] += n - tests["failed"] += n - elif verb == "skipped": - mm["skipped"] += n - tests["skipped"] += n + counts = {"successful": 0, "failed": 0, "skipped": 0} + for pm in RE_GSUM_PART.finditer(m.group(0)): + counts[pm.group(2)] += int(pm.group(1)) + add_counts(cur_task or "(unknown)", counts["successful"], counts["failed"], counts["skipped"]) continue m = RE_GTEST_P.search(line) if m: @@ -192,8 +198,22 @@ with open(log_path, encoding="utf-8", errors="replace") as f: seen_warnings.add(key) warnings.append(key) -failed = [t + (" — " + h if h else "") for t, h in zip(failed_tasks, headlines + [""] * len(failed_tasks))] -data = {"status": status, "totalTime": total_time, "failedTasks": failed, "warnings": warnings, +# Pair each failed task with the headline that names it ("Execution failed for task ':x:y'."); +# a task with no naming headline points at the build-level Primary Failure section instead of +# being paired positionally with an unrelated headline. +primary_failures = [h for h in headlines if h] +headline_by_task = {} +for h in primary_failures: + hm = RE_HL_TASK.search(h) + if hm and hm.group(1) not in headline_by_task: + headline_by_task[hm.group(1)] = h +fallback = "(see Primary Failure)" if primary_failures else "" +failed = [] +for t in failed_tasks: + h = headline_by_task.get(t) or fallback + failed.append(t + (" — " + h if h else "")) +data = {"status": status, "totalTime": total_time, "failedTasks": failed, + "primaryFailures": primary_failures, "warnings": warnings, "tests": tests, "slowTasks": [], "depIssues": dep_issues, "actions": []} os.makedirs(OUT_DIR, exist_ok=True) @@ -206,9 +226,11 @@ if failed: L.append("## Failing Tasks") L += [f"- {t}" for t in failed] L.append("") -if headlines: +if primary_failures: L.append("## Primary Failure") - L += [f"```text\n{h}\n```" for h in headlines[:3] if h] + L += [f"```text\n{h}\n```" for h in primary_failures[:3]] + if len(primary_failures) > 3: + L.append(f"… {len(primary_failures) - 3} more (see primaryFailures in {JS})") L.append("") if tests["total"]: L.append("## Tests") @@ -233,3 +255,14 @@ open(MD, "w").write("\n".join(L) + "\n") print(f"{status} (time: {total_time or 'n/a'}); {len(failed)} failing task(s), {tests['failed']} test failure(s)") print(f"Wrote {MD} and {JS}") PYEOF + +if [ "$summary_rc" -ne 0 ]; then + echo "⚠ gradle summary generation failed (rc=$summary_rc) — full log at: $LOG" + mkdir -p build/reports/claude + log_json="$(printf '%s' "$LOG" | sed -e 's/\\/\\\\/g' -e 's/"/\\"/g')" + printf '# Gradle Summary\n\n- Status: UNKNOWN (summary generation failed, rc=%s)\n- Log: %s\n' \ + "$summary_rc" "$LOG" > build/reports/claude/gradle-summary.md + printf '{"status": "UNKNOWN", "totalTime": null, "failedTasks": [], "primaryFailures": [], "warnings": [], "tests": {"total": 0, "failed": 0, "skipped": 0, "modules": {}}, "slowTasks": [], "depIssues": ["summary generation failed (rc=%s), see %s"], "actions": []}\n' \ + "$summary_rc" "$log_json" > build/reports/claude/gradle-summary.json + exit "$summary_rc" +fi diff --git a/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java b/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java index 6f5bd6374b..1fcf7e2ddf 100644 --- a/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java +++ b/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java @@ -471,7 +471,7 @@ public Map getDebugCounters() { * the qualifying tid will match no tracked instance and no leak tag will * ever be assigned to the scenario's real instances. */ - public static int getTid() { + static int getTid() { return getTid0(); } @@ -545,7 +545,14 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l /** * Test seam (debug native builds only - a no-op returning {@code false}/{@code 0}/an - * empty array in release builds): decouples LivenessTracker's leak-candidate + * empty array in release builds). This and every reference-chain/liveness seam below + * (plus {@link #getTid()}) are deliberately package-private: they mutate state of the + * process-wide profiler singleton, so they must not be callable by application code + * sharing the JVM with a debug native build. Tests outside this package reach them only + * through the test-source bridge {@code com.datadoghq.profiler.ReferenceChainTestHooks} + * (ddprof-test), same pattern as {@code ProfilerOwnedBlockHooks}. + *

    + * Decouples LivenessTracker's leak-candidate * detection from ReferenceChainTracker's chain reconstruction, each independently * verifiable end-to-end without depending on both the probabilistic JVMTI heap * sampler and the reference-chain BFS search organically producing the right @@ -555,7 +562,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * bypassing {@code initialize()}'s live-JVM requirement. Returns {@code true} on * debug builds. */ - public static native boolean setGcGenerationsEnabled0(boolean enabled); + static native boolean setGcGenerationsEnabled0(boolean enabled); /** * Test seam (debug native builds only): seeds one epoch's worth of population @@ -565,7 +572,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * can then rank, letting a test assert a slope signal would be generated for a * chosen klass id without waiting on real GC epochs. */ - public static native void seedKlassPopulationSample0(int klassId, int count, long epoch); + static native void seedKlassPopulationSample0(int klassId, int count, long epoch); /** * Test seam (debug native builds only): seeds one epoch's worth of per-tid trend @@ -577,7 +584,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * tid from {@link #getTid()} whenever the scenario also relies on leak tagging * of real tracked instances; see that method's own comment. */ - public static native void seedTidTrendSample0(int klassId, int tid, int count, long epoch); + static native void seedTidTrendSample0(int klassId, int tid, int count, long epoch); /** * Test seam (debug native builds only): wires {@code representative} in as {@code klassId}'s @@ -588,13 +595,13 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * {@link #pollReferenceChainTargets0()}'s bridging step can be exercised end-to-end with * neither the real sampler nor the real root-seeded walk involved. */ - public static native void setKlassPopulationRepresentativeForTest0(int klassId, Object representative); + static native void setKlassPopulationRepresentativeForTest0(int klassId, Object representative); /** * Test seam (debug native builds only): clears LivenessTracker's per-klass population table, * so a later test in the same JVM does not observe leak candidates seeded by an earlier one. */ - public static native void resetKlassPopulationForTest0(); + static native void resetKlassPopulationForTest0(); /** * Test seam (debug native builds only): returns the klass ids LivenessTracker's @@ -604,7 +611,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * generated (real or seeded via {@link #seedKlassPopulationSample0}) without * needing a reference-chain search to also be running. */ - public static native int[] selectLeakCandidateKlassIds0(); + static native int[] selectLeakCandidateKlassIds0(); /** * Test seam (debug native builds only): tags {@code target} and inserts it @@ -617,7 +624,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * reports), or {@code 0} on failure (reference chains disabled, or the frontier * table is at capacity). */ - public static native long tagAsReferenceChainRoot0(Object target); + static native long tagAsReferenceChainRoot0(Object target); /** * Test seam (debug native builds only): runs exactly one bounded BFS pass of the @@ -625,7 +632,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * background thread/cadence. Returns {@code false} if reference chains are * disabled or the tracker was never started. */ - public static native boolean runReferenceChainPass0(); + static native boolean runReferenceChainPass0(); /** * Test seam (debug native builds only): runs one poll of @@ -634,7 +641,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * {@link #runReferenceChainPass0()} walk, reconstructs and queues its chain * event, rather than waiting on the background thread's own scheduling cycle. */ - public static native void pollReferenceChainTargets0(); + static native void pollReferenceChainTargets0(); /** * Test seam (debug native builds only): drains and returns the number of @@ -643,7 +650,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * {@code datadog.ReferenceChain} JFR events) - lets a test assert a chain was * actually reconstructed without needing a real JFR dump. */ - public static native int drainReferenceChainEventCount0(); + static native int drainReferenceChainEventCount0(); /** * Test seam (debug native builds only): resets ReferenceChainTracker's search/frontier state @@ -653,7 +660,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * calls this at the start of its test body to force one, rather than depending on being the * first reference-chain test to run in a shared test JVM. */ - public static native void resetReferenceChainSearchForTest0(); + static native void resetReferenceChainSearchForTest0(); /** * Test seam (debug native builds only): diagnostic-only, does not tag {@code target}. Reads @@ -662,14 +669,14 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * (0 = expands next) if still queued, {@code -1} if tagged but no longer queued (already * expanded), or {@code -2} if never admitted at all. */ - public static native long getReferenceChainPendingPositionForTest0(Object target); + static native long getReferenceChainPendingPositionForTest0(Object target); /** * Test seam (debug native builds only): the current size of ReferenceChainTracker's * pending-expansion queue, for computing {@link #getReferenceChainPendingPositionForTest0}'s * position as a fraction of the current backlog. */ - public static native long getReferenceChainPendingSizeForTest0(); + static native long getReferenceChainPendingSizeForTest0(); /** * Test seam (debug native builds only): seeds one heap-floor-ring sample - the input to @@ -679,7 +686,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * self-consistent, strictly increasing sequence to build an arbitrary rising or flat * heap-usage-over-time history without waiting on real GCs. */ - public static native void heapFloorRecordForTest0(long usedBytes, long timestampNs); + static native void heapFloorRecordForTest0(long usedBytes, long timestampNs); /** * Test seam (debug native builds only): overrides the max-heap-size {@code secondsToOOM()} @@ -687,7 +694,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * exercise the projection deterministically, independent of whatever {@code -Xmx} this JVM's * own shared, no-{@code forkEvery} fork happens to run with. */ - public static native void setMaxHeapBytesForTest0(long maxHeapBytes); + static native void setMaxHeapBytesForTest0(long maxHeapBytes); /** * Test seam (debug native builds only): temporarily disables {@code onGC()}'s own @@ -696,7 +703,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * with a real {@code OS::nanotime()} timestamp and real heap usage, corrupting * {@code secondsToOOM()}'s projection. Pass {@code false} to disable, {@code true} to restore. */ - public static native void setHeapFloorRecordingForTest0(boolean enabled); + static native void setHeapFloorRecordingForTest0(boolean enabled); /** * Test seam (debug native builds only): reports whether ReferenceChainTracker's search-restart @@ -704,9 +711,13 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * fresh/terminal search to start - in particular, whether {@code secondsToOOM()}'s urgent-OOM * bypass opens this gate even with zero per-klass leak candidate (confirmable in the same test * via {@link #selectLeakCandidateKlassIds0()}). Unlike {@link #runReferenceChainPass0()}, which - * calls {@code runPass()} unconditionally, this reads the gate itself without running a pass. + * calls {@code runPass()} unconditionally, this evaluates the real gate without executing a + * BFS pass - but it is NOT a read-only query: under the native engine lock it may account a + * completed search's pain and restart/reset terminal search state, and opening the gate on + * the urgent-OOM bypass spends the episode's one-shot urgency entitlement. Do not treat it + * as a pure predicate (e.g. inside an assertion) when a scenario's search state matters. */ - public static native boolean shouldRunPassForTest0(); + static native boolean shouldRunPassForTest0(); /** * Test seam (debug native builds only): the number of BFS passes run for the current/most @@ -716,7 +727,7 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * collectStaleExpandedEntriesForRotation()}) ran strictly after the object existed, rather * than from the same pass racing the object's creation. */ - public static native int referenceChainPassesRunForTest0(); + static native int referenceChainPassesRunForTest0(); // ---- Test-only reads of the current thread's OTEP record ---------------------------------- // Each resolves the current carrier's record directly (like the write primitives above) with diff --git a/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java b/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java index a63c613752..81e12bffc7 100644 --- a/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java +++ b/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java @@ -68,8 +68,11 @@ public void stopGracefully(Duration timeout) { } private void growthLoop() { - while (running && cache.size() < CAP_ENTRIES) { - for (int i = 0; i < BATCH_SIZE && cache.size() < CAP_ENTRIES; i++) { + // nextKey, not cache.size(): ConcurrentHashMap.size() sums every counter cell, too + // costly per put. Equivalent here - this thread is the only writer, keys are unique + // and nothing is ever removed, so nextKey always equals the entry count. + while (running && nextKey < CAP_ENTRIES) { + for (int i = 0; i < BATCH_SIZE && nextKey < CAP_ENTRIES; i++) { String key = "refchain-leak-" + (nextKey++); cache.put(key, new CachedEntry(key)); MemoryGovernor.pace(); diff --git a/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java b/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java index 0416a1fea1..21eb70b97a 100644 --- a/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java +++ b/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java @@ -23,7 +23,7 @@ * * 

      * java -agentpath:/path/to/libjavaProfiler.so=start,memory=64:l,generations=true,\
- *   referencechains=true:hops=64:budget=4000:ttl=120000:framecap=2000000:\
+ *   referencechains=true:hops=64:budget=10000:ttl=120000:framecap=2000000:\
  *   pausetarget=5000:painbudget=100,jfr,file=repro.jfr \
  *   -jar refchains_repro.jar repro.jfr /path/to/libjavaProfiler.so
  *
    @@ -43,7 +43,12 @@ * {@code datadog.ReferenceChain} into the JFR file - nothing drains that queue on a timer, * and in production it's dd-trace-java's own periodic recording-chunk rotation that calls * {@code dump()}. Without it, chain events get built and enqueued (visible via {@code - * TEST_LOG}) but are silently discarded when the process exits. + * TEST_LOG}) but are silently discarded when the process exits. Each periodic dump goes to + * its own file, {@code .snapshot.} (printed as a {@code [repro] + * dumped ...} line), because a drained chain event is written exactly once: reusing one + * snapshot path would overwrite - and permanently lose - every earlier window's chains. + * A bounded run's final dump goes to {@code .snapshot} (the path the sweep + * scripts read); inspect all snapshot files together for the complete chain evidence. *
  • Passing the {@code .so} path explicitly to {@link JavaProfiler#getInstance(String, * String)}: with no {@code libLocation}, {@code getInstance()} extracts the jar's own * bundled copy of the library to a fresh temp file and {@code System.load()}s that @@ -113,20 +118,44 @@ public final class ReferenceChainLeakDemo { // call, not just this app's own memory growth, is load-bearing for the repro. private static final int DUMP_EVERY_N_ROUNDS = 10; + private static final String USAGE = + "usage: ReferenceChainLeakDemo [duration-seconds] " + + "(both required args must match the -agentpath:=...jfr,file= values; " + + "duration-seconds - a non-negative whole number of seconds - runs a bounded, " + + "metrics-reporting session instead of forever)"; + public static void main(String[] args) throws Exception { if (args.length < 2) { - System.err.println("usage: ReferenceChainLeakDemo [duration-seconds] " - + "(both required args must match the -agentpath:=...jfr,file= values; " - + "duration-seconds runs a bounded, metrics-reporting session instead of forever)"); + System.err.println(USAGE); System.exit(1); } - long durationSeconds = args.length >= 3 ? Long.parseLong(args[2]) : -1; + long durationSeconds = args.length >= 3 ? parseDurationSeconds(args[2]) : -1; run(Paths.get(args[0]), args[1], durationSeconds); } + // Malformed input (e.g. an empty/garbled $DURATION from the wrapper scripts) must print the + // usage and exit non-zero, not die with an uncaught NumberFormatException. Also rejects + // values whose deadline (seconds * 1e9 ns, see run()) would overflow a long. + private static long parseDurationSeconds(String arg) { + long seconds; + try { + seconds = Long.parseLong(arg.trim()); + } catch (NumberFormatException e) { + seconds = -1; + } + if (seconds < 0 || seconds > Long.MAX_VALUE / 1_000_000_000L) { + System.err.println("invalid duration-seconds '" + arg + "'"); + System.err.println(USAGE); + System.exit(1); + } + return seconds; + } + // FlightRecorder::dump() (flightRecorder.cpp) rejects dumping the continuous recording to - // its own file= path ("Can not dump recording to itself"), so periodic drains must target - // a different path; this is that path's suffix. + // its own file= path ("Can not dump recording to itself"), so drains must target a + // different path; this is that path's suffix. Periodic drains append "." so each + // window's drained chain events survive (see this class's header comment); the final + // bounded-run drain uses the bare suffix. private static final String SNAPSHOT_SUFFIX = ".snapshot"; // Tracked so a bounded run (durationSeconds >= 0) can report throughput/latency/memory @@ -138,7 +167,8 @@ public static void main(String[] args) throws Exception { private static long maxRoundNanos = 0; private static void run(Path recordingPath, String agentSoPath, long durationSeconds) throws InterruptedException { - // Must differ from recordingPath itself - see SNAPSHOT_SUFFIX's comment. + // Must differ from recordingPath itself - see SNAPSHOT_SUFFIX's comment. Final + // (bounded-run) drain target; periodic drains use snapshotPath + "." + round. Path snapshotPath = recordingPath.resolveSibling(recordingPath.getFileName() + SNAPSHOT_SUFFIX); // Must pass the exact .so path -agentpath already loaded: JavaProfiler.getInstance() // with no libLocation extracts the jar's own bundled copy to a fresh temp file and @@ -199,7 +229,11 @@ private static void run(Path recordingPath, String agentSoPath, long durationSec } if (round % DUMP_EVERY_N_ROUNDS == 0) { - profiler.dump(snapshotPath); + // Distinct file per drain: an event drained here is written only to this file. + Path roundSnapshotPath = + snapshotPath.resolveSibling(snapshotPath.getFileName() + "." + round); + profiler.dump(roundSnapshotPath); + System.out.println("[repro] dumped " + roundSnapshotPath); } long roundNanos = System.nanoTime() - roundStartNanos; @@ -212,6 +246,7 @@ private static void run(Path recordingPath, String agentSoPath, long durationSec if (durationSeconds >= 0) { profiler.dump(snapshotPath); + System.out.println("[repro] dumped " + snapshotPath); reportMetrics(startNanos, startHeapUsedMb); } } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/JavaProfilerApiSurfaceTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/JavaProfilerApiSurfaceTest.java index 55766f1890..a7075f91f3 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/JavaProfilerApiSurfaceTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/JavaProfilerApiSurfaceTest.java @@ -13,6 +13,7 @@ import java.util.HashSet; import java.util.Set; +import static org.junit.jupiter.api.Assertions.assertEquals; import static org.junit.jupiter.api.Assertions.assertFalse; public class JavaProfilerApiSurfaceTest { @@ -25,20 +26,31 @@ public void ownedBlockHooksAreNotPublicApiBeforeTaskBlockInstrumentation() throw assertNotPublic(JavaProfiler.class.getDeclaredMethod("blockExit", long.class)); } + // State-mutating hooks into the process-wide profiler singleton: reachable from tests only + // through the test-source bridge ReferenceChainTestHooks, never from application code. + private static final Set REFERENCE_CHAIN_TEST_SEAMS = new HashSet<>(Arrays.asList( + "getTid", "setGcGenerationsEnabled0", "seedKlassPopulationSample0", + "seedTidTrendSample0", "setKlassPopulationRepresentativeForTest0", + "resetKlassPopulationForTest0", "selectLeakCandidateKlassIds0", + "tagAsReferenceChainRoot0", "runReferenceChainPass0", "pollReferenceChainTargets0", + "drainReferenceChainEventCount0", "resetReferenceChainSearchForTest0", + "getReferenceChainPendingPositionForTest0", "getReferenceChainPendingSizeForTest0", + "heapFloorRecordForTest0", "setMaxHeapBytesForTest0", "setHeapFloorRecordingForTest0", + "shouldRunPassForTest0", "referenceChainPassesRunForTest0")); + @Test public void referenceChainTestSeamsAreNotPublicApi() { - Set seams = new HashSet<>(Arrays.asList( - "getTid", "setGcGenerationsEnabled0", "seedKlassPopulationSample0", - "seedTidTrendSample0", "selectLeakCandidateKlassIds0", "tagAsReferenceChainRoot0", - "runReferenceChainPass0", "pollReferenceChainTargets0", - "drainReferenceChainEventCountForLeaf0")); + Set found = new HashSet<>(); for (Method m : JavaProfiler.class.getDeclaredMethods()) { - if (seams.contains(m.getName()) || m.getName().endsWith("ForTest0")) { + if (REFERENCE_CHAIN_TEST_SEAMS.contains(m.getName())) { + found.add(m.getName()); assertFalse(Modifier.isPublic(m.getModifiers()), - m.getName() + " is a test seam and must not be public API" - + " (tests reach it through ReferenceChainTestHooks)"); + m.getName() + " is a state-mutating test seam and must stay non-public; " + + "tests reach it via ReferenceChainTestHooks"); } } + assertEquals(REFERENCE_CHAIN_TEST_SEAMS, found, + "every listed reference-chain test seam must still exist on JavaProfiler"); } private static void assertNotPublic(Method method) { diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java b/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java index c37170fa2a..e2b297a2a3 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java @@ -6,15 +6,16 @@ package com.datadoghq.profiler; /** - * Test bridge for the package-private reference-chain/liveness test seams on {@link JavaProfiler}, - * so tests outside {@code com.datadoghq.profiler} can call them without the seams becoming public - * API of the shipped jar. The native seams exist only in -DDEBUG builds (debug/asan/tsan); release - * builds get no-op stubs. + * Test bridge for {@link JavaProfiler}'s package-private reference-chain / liveness test seams + * (same pattern as {@link ProfilerOwnedBlockHooks}). The seams mutate the process-wide profiler + * singleton's state, so they stay non-public in the shipped library; this class lives only in + * test sources and lets tests in other packages (e.g. {@code referencechains}) reach them. + * Every method is a plain delegate - see the corresponding {@link JavaProfiler} seam for its + * contract (all are debug-native-build only and no-ops in release builds). */ public final class ReferenceChainTestHooks { private ReferenceChainTestHooks() {} - /** The calling thread's profiler tid. Call it on the allocating (leaking) thread. */ public static int getTid() { return JavaProfiler.getTid(); } @@ -55,8 +56,8 @@ public static void pollReferenceChainTargets0() { JavaProfiler.pollReferenceChainTargets0(); } - public static int drainReferenceChainEventCountForLeaf0(Object leaf) { - return JavaProfiler.drainReferenceChainEventCountForLeaf0(leaf); + public static int drainReferenceChainEventCount0() { + return JavaProfiler.drainReferenceChainEventCount0(); } public static void resetReferenceChainSearchForTest0() { @@ -71,14 +72,6 @@ public static long getReferenceChainPendingSizeForTest0() { return JavaProfiler.getReferenceChainPendingSizeForTest0(); } - public static int getReferenceChainFrontierStateForTest0(Object target) { - return JavaProfiler.getReferenceChainFrontierStateForTest0(target); - } - - public static long getReferenceChainResolvedTargetTagForTest0(Object target) { - return JavaProfiler.getReferenceChainResolvedTargetTagForTest0(target); - } - public static void heapFloorRecordForTest0(long usedBytes, long timestampNs) { JavaProfiler.heapFloorRecordForTest0(usedBytes, timestampNs); } @@ -91,29 +84,7 @@ public static void setHeapFloorRecordingForTest0(boolean enabled) { JavaProfiler.setHeapFloorRecordingForTest0(enabled); } - /** - * Clears the heap-floor ring seeded via {@link #heapFloorRecordForTest0(long, long)} so - * the next test in the same JVM starts from an empty ring. Call before the - * {@link #setHeapFloorRecordingForTest0(boolean)} restore, while recording is still - * disabled - the native seam asserts when called while recording is enabled. - */ - public static void heapFloorResetForTest0() { - JavaProfiler.heapFloorResetForTest0(); - } - - /** - * Reports whether the seeded heap-floor ring currently shows a sustained rise - * ({@code heapFloorRising()}). {@code false} before any seeding and after - * {@link #heapFloorResetForTest0()} emptied the ring. - */ - public static boolean heapFloorRisingForTest0() { - return JavaProfiler.heapFloorRisingForTest0(); - } - - /** - * Not a read-only query: under the native engine lock the gate may account a completed - * search's pain and restart/reset terminal search state. - */ + /** Not a pure predicate - see {@link JavaProfiler}'s own {@code shouldRunPassForTest0()} doc. */ public static boolean shouldRunPassForTest0() { return JavaProfiler.shouldRunPassForTest0(); } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java index 8cc7f9a440..b56e986235 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java @@ -6,8 +6,8 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.AbstractProfilerTest; -import com.datadoghq.profiler.JavaProfiler; import com.datadoghq.profiler.Platform; +import com.datadoghq.profiler.ReferenceChainTestHooks; import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.assertFalse; @@ -61,6 +61,24 @@ private static void assumeDebugBuild() { + "debug native build (javaApi.cpp's #ifdef DEBUG guard)"); } + /** + * Undoes this class's synthetic seeding so later tests in this shared, no-forkEvery JVM never + * see it. {@code resetKlassPopulationForTest0()} also zeroes LivenessTracker's heap-floor ring + * (head/fill - {@code klassPopulationResetForTest()}, livenessTracker.h), so + * {@code secondsToOOM()} reports "insufficient fill" until real GC samples build up again; it + * runs while heap-floor recording is still disabled so no real sample can interleave. + * {@code resetReferenceChainSearchForTest0()} then clears any urgency latch and spent one-shot + * entitlement ({@code _urgent_latched}/{@code _urgent_search_spent}) plus the search state the + * urgent bypass started - after the ring reset, so the BFS thread cannot re-latch from the + * stale projection. Recording is re-enabled last. + */ + private static void restoreHeapFloorDefaults() { + ReferenceChainTestHooks.setMaxHeapBytesForTest0(-1); + ReferenceChainTestHooks.resetKlassPopulationForTest0(); + ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); + ReferenceChainTestHooks.setHeapFloorRecordingForTest0(true); + } + /** * Seeds ten heap-floor-ring samples rising fast enough that {@code secondsToOOM()}'s projection * lands well under {@code OOM_URGENT_THRESHOLD_S} (300s), with LivenessTracker's per-klass @@ -82,44 +100,43 @@ private static void assumeDebugBuild() { public void shouldOpenSearchGateOnAggressiveHeapWideGrowthWithNoLeakCandidate() throws InterruptedException { assumeDebugBuild(); - JavaProfiler.setHeapFloorRecordingForTest0(false); - JavaProfiler.resetKlassPopulationForTest0(); - JavaProfiler.resetReferenceChainSearchForTest0(); + ReferenceChainTestHooks.setHeapFloorRecordingForTest0(false); + ReferenceChainTestHooks.resetKlassPopulationForTest0(); + ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); try { // 1000 MiB fake max heap, rising from 100 MiB to 991 MiB over 9 (fake) seconds: ~99 MiB/s, // 9 MiB of headroom left at the last sample -> projected time-to-OOM ~= 9/99 s, far under // OOM_URGENT_THRESHOLD_S = 300s. - JavaProfiler.setMaxHeapBytesForTest0(1000L * 1024 * 1024); + ReferenceChainTestHooks.setMaxHeapBytesForTest0(1000L * 1024 * 1024); for (int i = 0; i < 10; i++) { long usedBytes = (100L + i * 99L) * 1024 * 1024; long timestampNs = i * 1_000_000_000L; - JavaProfiler.heapFloorRecordForTest0(usedBytes, timestampNs); + ReferenceChainTestHooks.heapFloorRecordForTest0(usedBytes, timestampNs); } - int[] candidates = JavaProfiler.selectLeakCandidateKlassIds0(); + int[] candidates = ReferenceChainTestHooks.selectLeakCandidateKlassIds0(); assertTrue(candidates == null || candidates.length == 0, "This test's own precondition: no per-klass candidate should exist, so passes running " + "below can only come from the aggregate urgent-OOM bypass"); - int passesBefore = JavaProfiler.referenceChainPassesRunForTest0(); + int passesBefore = ReferenceChainTestHooks.referenceChainPassesRunForTest0(); // Idle BFS cadence is ~1s/pass; urgency ramps it to ~10ms after the latch. 20s covers the // first evaluation landing up to one idle cadence after the seeding loop. long deadline = System.currentTimeMillis() + 20_000; - while (JavaProfiler.referenceChainPassesRunForTest0() == passesBefore + while (ReferenceChainTestHooks.referenceChainPassesRunForTest0() == passesBefore && System.currentTimeMillis() < deadline) { Thread.sleep(50); } - assertTrue(JavaProfiler.referenceChainPassesRunForTest0() > passesBefore, + assertTrue(ReferenceChainTestHooks.referenceChainPassesRunForTest0() > passesBefore, "Expected the BFS thread to run passes from the urgent heap-wide OOM projection alone, " + "with zero per-klass leak candidate"); - candidates = JavaProfiler.selectLeakCandidateKlassIds0(); + candidates = ReferenceChainTestHooks.selectLeakCandidateKlassIds0(); assertTrue(candidates == null || candidates.length == 0, "The passes that just ran must still have had zero per-klass candidates - the " + "aggregate urgent-OOM projection was the only possible trigger"); } finally { - JavaProfiler.setMaxHeapBytesForTest0(-1); - JavaProfiler.setHeapFloorRecordingForTest0(true); + restoreHeapFloorDefaults(); } } @@ -132,25 +149,24 @@ public void shouldOpenSearchGateOnAggressiveHeapWideGrowthWithNoLeakCandidate() @Test public void shouldNotOpenSearchGateOnFlatHeapFloorWithNoLeakCandidate() { assumeDebugBuild(); - JavaProfiler.setHeapFloorRecordingForTest0(false); - JavaProfiler.resetKlassPopulationForTest0(); - JavaProfiler.resetReferenceChainSearchForTest0(); + ReferenceChainTestHooks.setHeapFloorRecordingForTest0(false); + ReferenceChainTestHooks.resetKlassPopulationForTest0(); + ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); try { - JavaProfiler.setMaxHeapBytesForTest0(1000L * 1024 * 1024); + ReferenceChainTestHooks.setMaxHeapBytesForTest0(1000L * 1024 * 1024); for (int i = 0; i < 10; i++) { - JavaProfiler.heapFloorRecordForTest0(200L * 1024 * 1024, i * 1_000_000_000L); + ReferenceChainTestHooks.heapFloorRecordForTest0(200L * 1024 * 1024, i * 1_000_000_000L); } - int[] candidates = JavaProfiler.selectLeakCandidateKlassIds0(); + int[] candidates = ReferenceChainTestHooks.selectLeakCandidateKlassIds0(); assertTrue(candidates == null || candidates.length == 0, "This test's own precondition: no per-klass candidate should exist either"); - assertFalse(JavaProfiler.shouldRunPassForTest0(), + assertFalse(ReferenceChainTestHooks.shouldRunPassForTest0(), "Expected the search-restart gate to stay closed: no heap growth and no per-klass " + "candidate give hasLeakSignal() nothing to trust"); } finally { - JavaProfiler.setMaxHeapBytesForTest0(-1); - JavaProfiler.setHeapFloorRecordingForTest0(true); + restoreHeapFloorDefaults(); } } } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java index 656be82fa1..84228969e8 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java @@ -94,7 +94,8 @@ private void assertCorrelationFound(String pauseTargetOption) throws Exception { * leak-accumulation rotation's FRONTIER-state selection is additionally asserted, and * the correlation result markers that the pod regime legitimately produces without the * full correlation completing (not-found, tag-out-of-pool - see the tight variant's own - * comment) are accepted instead of failed. + * comment) are accepted instead of failed - but only if the child logged at least one + * leak-tag interception/correlation or chain-reconstruction attempt. */ private void assertCorrelationFound(String pauseTargetOption, boolean requireFrontierRotation) throws Exception { @@ -109,6 +110,10 @@ private void assertCorrelationFound(String pauseTargetOption, // long run cannot grow this without limit. Deque testLogTail = new ArrayDeque<>(); AtomicBoolean frontierRotationSeen = new AtomicBoolean(false); + // Hard evidence for the tight variant's escape hatch: at least one leak-tag interception / + // correlation or chain-reconstruction attempt happened in the child. Set while lines stream + // in (not scanned from testLogTail, whose evict-oldest cap can drop early lines). + AtomicBoolean correlationActivitySeen = new AtomicBoolean(false); try { // Same raised budget as ExternalProcessReferenceChainTest's own scenarios: a genuinely // fresh, cold external JVM's reachable graph is far larger than the in-process tests', @@ -154,6 +159,12 @@ private void assertCorrelationFound(String pauseTargetOption, && line.contains("state=FRONTIER")) { frontierRotationSeen.set(true); } + if (line.contains("leak-tag intercepted:") // heapReferenceCallback interception + || line.contains("correlateAdmittedLeakTag frontier_tag=") // admitted correlation + || line.contains("buildChainEvent target_tag=") // chain reconstructed + || line.contains("reconstructChain")) { // reconstruction attempted, failed + correlationActivitySeen.set(true); + } testLogTail.addLast(line); while (testLogTail.size() > 2000) { testLogTail.removeFirst(); @@ -186,7 +197,16 @@ private void assertCorrelationFound(String pauseTargetOption, if (requireFrontierRotation && (line.equals(LeakTagCorrelationScenario.NOT_FOUND_MARKER) || line.startsWith(LeakTagCorrelationScenario.TAG_OUT_OF_POOL_MARKER))) { // The pod regime legitimately produces these without full correlation completing - // (see the tight variant's comment); the loose variant still fails on them. + // (see the tight variant's comment); the loose variant still fails on them. The + // escape hatch is NOT a blanket pass: the correlation machinery must have run at + // least once (a leak-tag interception/correlation, or a chain-reconstruction + // attempt), so a fully broken path (tagging never firing, interception always + // dropping, no chain ever reconstructed) still fails here. + assertTrue(correlationActivitySeen.get(), + "Tight-window outcome " + line + " accepted by the pod-regime escape hatch, but " + + "the child logged no leak-tag interception/correlation and no chain " + + "reconstruction attempt - the correlation path is broken outright, not " + + "losing the pod-regime race" + diagnostics(testLogTail)); return; } fail("Leak-tag correlation did not succeed: " + line + diagnostics(testLogTail)); @@ -217,7 +237,8 @@ private static String diagnostics(Deque testLogTail) { } else if (s.contains("intercepted") || s.contains("correlateAdmittedLeakTag") || s.contains("recordDiscoveredInstance") || s.contains("auto-mark") || s.contains("rotation_candidates") - || s.contains("collectLeakAccumulationCandidatesForRotation selected")) { + || s.contains("collectLeakAccumulationCandidatesForRotation selected") + || s.contains("buildChainEvent target_tag=") || s.contains("reconstructChain")) { leakTagLines.add(s); } } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java index f83eb16c15..92a4e3b0b5 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java @@ -6,6 +6,7 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.JavaProfiler; +import com.datadoghq.profiler.ReferenceChainTestHooks; import org.openjdk.jmc.common.IMCType; import org.openjdk.jmc.common.item.IItem; import org.openjdk.jmc.common.item.IItemCollection; @@ -19,8 +20,6 @@ import java.nio.file.Path; import java.util.ArrayList; import java.util.List; -import java.util.ArrayList; -import java.util.List; /** * The "leak-tag correlation" use case, run inside a genuinely separate child JVM by @@ -185,7 +184,10 @@ NoisePayload take() { */ public static final String NOISE_CHAIN_MARKER = "[correlation-noise-chain-emitted] "; - /** One dump's scan outcome - all fields per the latest dump only. */ + /** + * One dump's scan outcome - payload fields per one dump; the violation lists + * are accumulated across scans by keepBest() whenever it retains an earlier best. + */ private static final class ScanResult { ReferenceChainAssertions.ChainMatch payloadChain; boolean payloadChainInPool; @@ -218,7 +220,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } // The tid must be captured on THIS thread: the per-(klass, tid) seeding below // qualifies the allocating thread, and the noise instances are all allocated here. - handoff.publish(held[0], JavaProfiler.getTid()); + handoff.publish(held[0], ReferenceChainTestHooks.getTid()); long slot = 0; while (true) { try { @@ -255,8 +257,24 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // process's life; the noise representative only via the noise thread's frame (the // handoff's own reference is dropped by take()) - exactly what makes one a valid // leak candidate and the other a gate test. - JavaProfiler.setKlassPopulationRepresentativeForTest0(LEAK_KLASS_ID, LEAK_SINK.get(0)); - JavaProfiler.setKlassPopulationRepresentativeForTest0(NOISE_KLASS_ID, handoff.take()); + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( + LEAK_KLASS_ID, LEAK_SINK.get(0)); + // The noise thread publishes asynchronously (after allocating its payloads); + // wait (bounded) for it rather than racing take() into a null representative / tid 0. + for (int i = 0; i < 200 && handoff.representative == null; i++) { + Thread.sleep(25); + } + NoisePayload noiseRepresentative = handoff.take(); + // tid is published before representative (NoiseHandoff.publish()), so it is + // visible once take() has observed a non-null payload. + noiseTid = handoff.tid; + if (noiseRepresentative == null || noiseTid == 0) { + throw new IllegalStateException("noise thread never published its representative/tid" + + " within 5s (representative=" + noiseRepresentative + ", tid=" + noiseTid + ")"); + } + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( + NOISE_KLASS_ID, noiseRepresentative); + noiseRepresentative = null; // keep retention transient: drop this frame's reference // Per-(klass, tid) qualification seeds: selectLeakCandidates() now also // requires a qualifying ALLOCATING THREAD, and tagLeakInstances() scopes leak // tags to exactly those tids' instances - so the seeded qualification must @@ -265,26 +283,29 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // the tagging scope. Same epoch-aligned ramp shape as the klass seeds // (scaled to fit the per-tid u8 ring); the synthetic flag keeps these // ramps immune to the real fold's absent-tid decay between rounds. - leakTid = JavaProfiler.getTid(); - noiseTid = handoff.tid; + leakTid = ReferenceChainTestHooks.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - JavaProfiler.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); - JavaProfiler.seedKlassPopulationSample0(NOISE_KLASS_ID, epoch * 10, epoch); - JavaProfiler.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, epoch * 3, epoch); - JavaProfiler.seedTidTrendSample0(NOISE_KLASS_ID, noiseTid, epoch * 3, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0(NOISE_KLASS_ID, epoch * 10, epoch); + ReferenceChainTestHooks.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, epoch * 3, epoch); + ReferenceChainTestHooks.seedTidTrendSample0(NOISE_KLASS_ID, noiseTid, epoch * 3, epoch); } + // Continue the ramp past the seeded range: each maintenance round below + // pre-increments, so the first round pushes epoch SEED_EPOCHS_FOR_HYSTERESIS + 1 + // (same as StaticFieldGrowingCollectionScenario). + hysteresisEpoch = SEED_EPOCHS_FOR_HYSTERESIS; // Wait for the BFS thread to fully complete its first pass (static sweep AND frontier // expansion) before any growth round - same load-bearing wait and rationale as // StaticFieldGrowingCollectionScenario: the late chunks added afterward must be // discovered via rotation re-walks, not by a first pass that has not even run yet. - int initialPasses = JavaProfiler.referenceChainPassesRunForTest0(); + int initialPasses = ReferenceChainTestHooks.referenceChainPassesRunForTest0(); for (int i = 0; i < 300; i++) { - if (JavaProfiler.referenceChainPassesRunForTest0() != initialPasses) { + if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() != initialPasses) { break; } Thread.sleep(100); } - JavaProfiler.pollReferenceChainTargets0(); + ReferenceChainTestHooks.pollReferenceChainTargets0(); } else { // No debug seams outside debug builds - give the real allocation sampler and the // pass loop time to notice the seeded population on their own. @@ -292,8 +313,10 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } // Each dump re-emits every resolved chain (drainPendingChainEvents()'s - // snapshot-and-keep contract), so a later dump's scan is a superset state - the - // latest scan with a payload chain observed is always the best evidence. + // snapshot-and-keep contract), so a later dump's scan is usually a superset state - + // the latest scan is preferred, except that keepBest() never lets a later, worse + // payload chain (e.g. out-of-pool) displace an earlier in-pool/correlated one; the + // gate violations of every retained-over scan are accumulated. ScanResult best = null; int totalRounds = 25; // Slow growth per round is deliberate: each chunk clears the allocation @@ -304,13 +327,13 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD addChunk(); if (debugBuild) { hysteresisEpoch++; - JavaProfiler.seedKlassPopulationSample0( + ReferenceChainTestHooks.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - JavaProfiler.seedKlassPopulationSample0( + ReferenceChainTestHooks.seedKlassPopulationSample0( NOISE_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - JavaProfiler.seedTidTrendSample0( + ReferenceChainTestHooks.seedTidTrendSample0( LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); - JavaProfiler.seedTidTrendSample0( + ReferenceChainTestHooks.seedTidTrendSample0( NOISE_KLASS_ID, noiseTid, hysteresisEpoch * 3, hysteresisEpoch); } System.gc(); @@ -339,13 +362,13 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } if (debugBuild) { hysteresisEpoch++; - JavaProfiler.seedKlassPopulationSample0( + ReferenceChainTestHooks.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - JavaProfiler.seedKlassPopulationSample0( + ReferenceChainTestHooks.seedKlassPopulationSample0( NOISE_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - JavaProfiler.seedTidTrendSample0( + ReferenceChainTestHooks.seedTidTrendSample0( LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); - JavaProfiler.seedTidTrendSample0( + ReferenceChainTestHooks.seedTidTrendSample0( NOISE_KLASS_ID, noiseTid, hysteresisEpoch * 3, hysteresisEpoch); } Thread.sleep(1000); @@ -377,15 +400,46 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD System.out.println(FOUND_MARKER + best.payloadChain.targetTag); } - /** Latest scan wins; a scan without a payload chain never displaces one that had it. */ + /** + * Monotonic in payload quality (same rule as ThreadLocalLeakScenario.keepBest(), and the + * same in-pool preference scan() applies within a single dump): a later scan replaces + * {@code best} only when its payload chain is at least as good - no chain < out-of-pool + * chain < in-pool chain < in-pool chain with a matching live object; at equal quality + * the newer scan wins. Whenever the earlier best is kept, the incoming scan's gate + * violations are merged into it so a later dump's transient/noise chain is never hidden. + */ private static ScanResult keepBest(ScanResult best, ScanResult scan) { if (scan == null) { return best; } - if (scan.payloadChain != null) { + if (best == null) { return scan; } - return best != null ? best : scan; + if (quality(scan) >= quality(best)) { + return scan; + } + mergeViolations(best.transientViolations, scan.transientViolations); + mergeViolations(best.noiseChains, scan.noiseChains); + return best; + } + + /** 0: no chain, 1: out-of-pool chain, 2: in-pool chain, 3: in-pool and correlated. */ + private static int quality(ScanResult r) { + if (r == null || r.payloadChain == null) { + return 0; + } + if (!r.payloadChainInPool) { + return 1; + } + return r.liveObjectMatchesForChainTag > 0 ? 3 : 2; + } + + private static void mergeViolations(List into, List from) { + for (String v : from) { + if (!into.contains(v)) { + into.add(v); + } + } } /** diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java index ed47fe10f3..f4cc0e89a1 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java @@ -6,6 +6,7 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.JavaProfiler; +import com.datadoghq.profiler.ReferenceChainTestHooks; import org.openjdk.jmc.common.IMCType; import org.openjdk.jmc.common.item.IItemCollection; import org.openjdk.jmc.common.item.ItemFilters; @@ -162,7 +163,8 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // resolves the representative's real klass id and aliases the synthetic id // to it, so the hysteresis seeds below land in the real population entry // (candidate matching is real-id keyed since the leak-tag pool redesign). - JavaProfiler.setKlassPopulationRepresentativeForTest0(CACHED_PAYLOAD_TEST_KLASS_ID, cache.get("seed-0")); + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( + CACHED_PAYLOAD_TEST_KLASS_ID, cache.get("seed-0")); if (!seededTestKlassTrend) { // Per-(klass, tid) qualification seeds: the qualifying tid is THIS // thread's - the creator of "seed-0", the always-reachable representative @@ -170,14 +172,16 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // threads are one-shot, so no single one of their tids carries a sustained // per-tid signal - exactly the one-cohort-per-thread shape the retained- // count bar / synthetic seeds exist to keep qualifying.) - int leakTid = JavaProfiler.getTid(); + int leakTid = ReferenceChainTestHooks.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - JavaProfiler.seedKlassPopulationSample0(CACHED_PAYLOAD_TEST_KLASS_ID, epoch * 10, epoch); - JavaProfiler.seedTidTrendSample0(CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch * 3, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0( + CACHED_PAYLOAD_TEST_KLASS_ID, epoch * 10, epoch); + ReferenceChainTestHooks.seedTidTrendSample0( + CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch * 3, epoch); } seededTestKlassTrend = true; } - JavaProfiler.pollReferenceChainTargets0(); + ReferenceChainTestHooks.pollReferenceChainTargets0(); profiler.dump(scratchDumpPath); match = findMatch(scratchDumpPath); } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java index 0d33e8fba2..552b8c642a 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java @@ -6,8 +6,8 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.AbstractProfilerTest; -import com.datadoghq.profiler.JavaProfiler; import com.datadoghq.profiler.Platform; +import com.datadoghq.profiler.ReferenceChainTestHooks; import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.assertTrue; @@ -18,9 +18,10 @@ * probabilistic allocation-sampling-driven slope detection and {@code ReferenceChainTracker}'s * root-seeded BFS discovery together, in one real-JVM run - reliable only when both mechanisms * happen to line up within the same bounded retry window. This class decouples them via the - * debug-build-only test seams on {@link JavaProfiler} (backed by {@code LivenessTracker}'s - * existing {@code *ForTest} seams and a new {@code ReferenceChainTracker::tagAsRootForTest()}, - * see javaApi.cpp), so each mechanism can be verified end-to-end in isolation: + * debug-build-only test seams on {@code JavaProfiler}, reached via + * {@link ReferenceChainTestHooks} (backed by {@code LivenessTracker}'s existing + * {@code *ForTest} seams and a new {@code ReferenceChainTracker::tagAsRootForTest()}, see + * javaApi.cpp), so each mechanism can be verified end-to-end in isolation: *
      *
    • {@link #shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope()} - asserts a slope signal * would fire from directly-seeded population history, with no allocation sampling involved.
      • @@ -93,8 +94,8 @@ private static void assumeDebugBuild() { @Test public void shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope() { assumeDebugBuild(); - JavaProfiler.resetKlassPopulationForTest0(); - JavaProfiler.setGcGenerationsEnabled0(true); + ReferenceChainTestHooks.resetKlassPopulationForTest0(); + ReferenceChainTestHooks.setGcGenerationsEnabled0(true); // KLASS_POPULATION_MIN_FILL_FOR_TREND = 10 (livenessTracker.h) is only the floor at which a // trend becomes eligible at all - selectLeakCandidates() also requires consecutive_positive @@ -102,16 +103,16 @@ public void shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope() { // (the sustained-trend hysteresis gate), so at least 10 + (5 - 1) = 14 strictly increasing // samples are needed; 20 gives headroom. for (int epoch = 1; epoch <= 20; epoch++) { - JavaProfiler.seedKlassPopulationSample0(SLOPE_TEST_KLASS_ID, epoch * 10, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0(SLOPE_TEST_KLASS_ID, epoch * 10, epoch); // Per-(klass, tid) qualification: selectLeakCandidates() now requires a // qualifying allocating thread on top of the klass-level ramp. This test // only asserts the klass makes it into the candidate list - it has no // tracked instances whose tid a tagging scope would need to match - so a // fixed synthetic tid suffices here. - JavaProfiler.seedTidTrendSample0(SLOPE_TEST_KLASS_ID, 4242, epoch * 3, epoch); + ReferenceChainTestHooks.seedTidTrendSample0(SLOPE_TEST_KLASS_ID, 4242, epoch * 3, epoch); } - int[] candidates = JavaProfiler.selectLeakCandidateKlassIds0(); + int[] candidates = ReferenceChainTestHooks.selectLeakCandidateKlassIds0(); boolean found = false; for (int klassId : candidates) { if (klassId == SLOPE_TEST_KLASS_ID) { @@ -135,15 +136,15 @@ public void shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope() { @Test public void shouldReconstructChainForDirectlyTaggedRoot() { assumeDebugBuild(); - JavaProfiler.resetKlassPopulationForTest0(); - JavaProfiler.setGcGenerationsEnabled0(true); + ReferenceChainTestHooks.resetKlassPopulationForTest0(); + ReferenceChainTestHooks.setGcGenerationsEnabled0(true); // Guards against inheriting a FrontierTable an earlier test in this same, no-forkEvery // JVM left permanently full/tiny - e.g. ReferenceChainTrackingTest's own // shouldReportAbandonedSearchOnTinyFrontierCap deliberately drives the shared table to // framecap=1 and leaves it that way. Same defensive pattern that class's own tests already // use (see its header comment); without it, tagAsReferenceChainRoot0()'s insert() below can // fail against a table this test never sized itself. - JavaProfiler.resetReferenceChainSearchForTest0(); + ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); // The target is referenced ONLY through the static holder - never bound to a // live local of this frame. A local `target` variable would make the object a @@ -155,66 +156,69 @@ public void shouldReconstructChainForDirectlyTaggedRoot() { // object only via the static field leaves its frame slots empty between // calls, so no stack root is ever enumerated. chainTargetHolder = new ChainTarget(); + try { + // Representative BEFORE seeding: with the aliasing seam, setting the representative is + // what registers the synthetic->real id alias, so the seeding below lands re-keyed under + // the target's real class id (seeding first still works - the synthetic entry gets + // re-keyed at representative-set time - but rep-first is the documented load-bearing order). + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( + CHAIN_TEST_KLASS_ID, chainTargetHolder); + + // See shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope()'s comment above for why 20 + // (not just KLASS_POPULATION_MIN_FILL_FOR_TREND = 10) is needed to clear the hysteresis gate. + for (int epoch = 1; epoch <= 20; epoch++) { + ReferenceChainTestHooks.seedKlassPopulationSample0(CHAIN_TEST_KLASS_ID, epoch * 10, epoch); + // Per-(klass, tid) qualification, seeded with THIS thread's real + // profiler tid: the target was allocated here, so if any path in the + // pass/poll cycle below does hinge on leak tagging of the target as a + // tracked instance, the qualifying tid matches it. (The chain's primary + // path is the directly-tagged frontier root + seeded representative, so + // this is belt-and-braces, not a proven requirement.) + ReferenceChainTestHooks.seedTidTrendSample0( + CHAIN_TEST_KLASS_ID, ReferenceChainTestHooks.getTid(), epoch * 3, epoch); + } - // Representative BEFORE seeding: with the aliasing seam, setting the representative is - // what registers the synthetic->real id alias, so the seeding below lands re-keyed under - // the target's real class id (seeding first still works - the synthetic entry gets - // re-keyed at representative-set time - but rep-first is the documented load-bearing order). - JavaProfiler.setKlassPopulationRepresentativeForTest0(CHAIN_TEST_KLASS_ID, chainTargetHolder); - - // See shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope()'s comment above for why 20 - // (not just KLASS_POPULATION_MIN_FILL_FOR_TREND = 10) is needed to clear the hysteresis gate. - for (int epoch = 1; epoch <= 20; epoch++) { - JavaProfiler.seedKlassPopulationSample0(CHAIN_TEST_KLASS_ID, epoch * 10, epoch); - // Per-(klass, tid) qualification, seeded with THIS thread's real - // profiler tid: the target was allocated here, so if any path in the - // pass/poll cycle below does hinge on leak tagging of the target as a - // tracked instance, the qualifying tid matches it. (The chain's primary - // path is the directly-tagged frontier root + seeded representative, so - // this is belt-and-braces, not a proven requirement.) - JavaProfiler.seedTidTrendSample0( - CHAIN_TEST_KLASS_ID, JavaProfiler.getTid(), epoch * 3, epoch); - } - - // One poll BEFORE the direct tag: the first pollReferenceChainTargets0() - // admits the seeded klass as a watched candidate (canary slot), and the - // seam's discovery recording (tagAsRootForTest's recordDiscoveredInstance) - // only lands when a candidate slot already watches the klass - the - // leak-tag redesign removed the marker-tag path the original pre-poll tag - // used to ride. - JavaProfiler.pollReferenceChainTargets0(); - - // The target is referenced ONLY through the static holder - never bound to a - // live local of this frame. A local `target` variable would make the object a - // STACK_LOCAL GC root for the whole test body, and the noise gate (rightly) - // suppresses depth-0 chains rooted in a transient stack slot: the durable - // roots this fixture wants (the static holder, plus the JNI-global-weak-ref - // root LivenessTracker's representative itself creates) then lose the - // durability race only if a stack-local root exists at all. Accessing the - // object only via the static field leaves its frame slots empty between - // calls, so no stack root is ever enumerated. - long tag = JavaProfiler.tagAsReferenceChainRoot0(chainTargetHolder); - assertTrue(tag > 0, "Expected tagAsReferenceChainRoot0 to assign a valid frontier tag"); - - // Drive pass+poll cycles until the chain event lands. One pass is NOT enough: - // admitStaticFieldRoots() sweeps loaded classes in chunks (a few hundred per pass, - // bounded by the budget) and the first pass truncates before reaching this test's - // class - the durable (static-field) root discovery that upgrades the target's - // root_kind only happens on the pass whose chunk covers ChainTarget's holder class. - // The bound (40) gives the full sweep lap (~10 passes for ~4000 loaded classes) - // several round trips of headroom; the BFS thread is excluded from racing these - // calls by the engine lock (runPassSerialized/pollWatchedTargetsSerialized). - int eventCount = 0; - for (int pass = 0; pass < 40 && eventCount == 0; pass++) { - boolean sawPassRun = JavaProfiler.runReferenceChainPass0(); - assertTrue(sawPassRun || pass > 0, - "Expected the first runReferenceChainPass0 to run (reference chains enabled)"); - JavaProfiler.pollReferenceChainTargets0(); - eventCount = JavaProfiler.drainReferenceChainEventCount0(); + // One poll BEFORE the direct tag: the first pollReferenceChainTargets0() + // admits the seeded klass as a watched candidate (canary slot), and the + // seam's discovery recording (tagAsRootForTest's recordDiscoveredInstance) + // only lands when a candidate slot already watches the klass - the + // leak-tag redesign removed the marker-tag path the original pre-poll tag + // used to ride. + ReferenceChainTestHooks.pollReferenceChainTargets0(); + + // The target is referenced ONLY through the static holder - never bound to a + // live local of this frame. A local `target` variable would make the object a + // STACK_LOCAL GC root for the whole test body, and the noise gate (rightly) + // suppresses depth-0 chains rooted in a transient stack slot: the durable + // roots this fixture wants (the static holder, plus the JNI-global-weak-ref + // root LivenessTracker's representative itself creates) then lose the + // durability race only if a stack-local root exists at all. Accessing the + // object only via the static field leaves its frame slots empty between + // calls, so no stack root is ever enumerated. + long tag = ReferenceChainTestHooks.tagAsReferenceChainRoot0(chainTargetHolder); + assertTrue(tag > 0, "Expected tagAsReferenceChainRoot0 to assign a valid frontier tag"); + + // Drive pass+poll cycles until the chain event lands. One pass is NOT enough: + // admitStaticFieldRoots() sweeps loaded classes in chunks (a few hundred per pass, + // bounded by the budget) and the first pass truncates before reaching this test's + // class - the durable (static-field) root discovery that upgrades the target's + // root_kind only happens on the pass whose chunk covers ChainTarget's holder class. + // The bound (40) gives the full sweep lap (~10 passes for ~4000 loaded classes) + // several round trips of headroom; the BFS thread is excluded from racing these + // calls by the engine lock (runPassSerialized/pollWatchedTargetsSerialized). + int eventCount = 0; + for (int pass = 0; pass < 40 && eventCount == 0; pass++) { + boolean sawPassRun = ReferenceChainTestHooks.runReferenceChainPass0(); + assertTrue(sawPassRun || pass > 0, + "Expected the first runReferenceChainPass0 to run (reference chains enabled)"); + ReferenceChainTestHooks.pollReferenceChainTargets0(); + eventCount = ReferenceChainTestHooks.drainReferenceChainEventCount0(); + } + assertTrue(eventCount > 0, + "Expected pollWatchedTargets() to have queued at least one chain event for the " + + "directly-tagged, seeded-representative target"); + } finally { + chainTargetHolder = null; // shared-JVM hygiene } - assertTrue(eventCount > 0, - "Expected pollWatchedTargets() to have queued at least one chain event for the " - + "directly-tagged, seeded-representative target"); - chainTargetHolder = null; // shared-JVM hygiene } } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java index c3fc86ec6b..cfbe851f0e 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java @@ -6,10 +6,10 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.AbstractProfilerTest; -import com.datadoghq.profiler.JavaProfiler; import com.datadoghq.profiler.JfrEvent; import com.datadoghq.profiler.JfrEvents; import com.datadoghq.profiler.Platform; +import com.datadoghq.profiler.ReferenceChainTestHooks; import org.junit.jupiter.api.MethodOrderer; import org.junit.jupiter.api.Order; import org.junit.jupiter.api.Tag; @@ -20,7 +20,9 @@ import java.nio.file.Files; import java.util.concurrent.LinkedBlockingQueue; import java.util.concurrent.Semaphore; +import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicLong; +import java.util.concurrent.atomic.AtomicReference; import java.nio.file.Path; import java.nio.file.Paths; import java.util.ArrayList; @@ -142,6 +144,11 @@ public class ReferenceChainTrackingTest extends AbstractProfilerTest { // for the same cheap-insurance-against-collision reason those two are distinct from each other. private static final int ABANDON_TEST_KLASS_ID = 987203; + // Upper bound on any single main-thread wait for a persistent allocator thread (tid + // publication or one round's batch): a dead/stuck allocator must fail the test, not hang the + // shared, no-forkEvery ddprof-test fork. + private static final long ALLOCATOR_HANDOFF_TIMEOUT_MS = 30_000; + @Override protected String getProfilerCommand() { String testName = testInfo != null @@ -358,8 +365,8 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { // has nothing to do with the seeding this method does further down (see // SEED_EPOCHS_FOR_HYSTERESIS's own comment), masking whether that seeding is actually // sufficient on its own. - JavaProfiler.resetKlassPopulationForTest0(); - JavaProfiler.resetReferenceChainSearchForTest0(); + ReferenceChainTestHooks.resetKlassPopulationForTest0(); + ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); } // One persistent allocator thread, reused by every round - NOT a fresh // spawned thread per round. Same JVMTI property the per-round spawn @@ -379,9 +386,10 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { LinkedBlockingQueue allocRequests = new LinkedBlockingQueue<>(); Semaphore roundDone = new Semaphore(0); AtomicLong allocatorTid = new AtomicLong(-1); + AtomicReference allocatorFailure = new AtomicReference<>(); Thread allocator = new Thread(() -> { - allocatorTid.set(JavaProfiler.getTid()); try { + allocatorTid.set(ReferenceChainTestHooks.getTid()); Integer requested; while ((requested = allocRequests.take()) != null) { List batch = currentBatch; @@ -392,17 +400,18 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { } } catch (InterruptedException e) { Thread.currentThread().interrupt(); // test shutdown - see finally below + } catch (Throwable t) { + allocatorFailure.set(t); // surfaced by awaitAllocatorTid()/awaitAllocatorRound() } }, "togcroot-leak-allocator"); allocator.start(); - // The seeding block below needs the allocator's tid; the thread publishes - // its own tid as its first action, so this wait is bounded by thread start. - while (allocatorTid.get() == -1) { - Thread.sleep(1); - } Path scratchDumpPath = Paths.get("referencechains-population-scratch.jfr"); try { + // The seeding block below needs the allocator's tid. Bounded and inside this try so a + // dead/stuck allocator fails the test (and is still shut down by the finally) instead of + // hanging the shared fork. + awaitAllocatorTid(allocator, allocatorTid, allocatorFailure); // Up to 16 rounds: selectLeakCandidates()'s KLASS_POPULATION_MIN_FILL_FOR_TREND = 10 // (livenessTracker.h) needs 10 *epochs that actually observe a surviving ChainLink sample*, // not just 10 dump() calls - allocation sampling is probabilistic (see below), so some @@ -450,7 +459,7 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { throw new IllegalStateException( "allocRequests queue rejected instance count " + newInstances); } - roundDone.acquireUninterruptibly(); + awaitAllocatorRound(roundDone, allocator, allocatorFailure); gcRootHolder.addAll(newLinks); System.gc(); dump(scratchDumpPath); @@ -492,7 +501,8 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { // entry (candidate matching is real-id keyed since the leak-tag pool // redesign; seeds under a bare synthetic id authorize only // hasLeakSignal()'s candidate-count check and match nothing else). - JavaProfiler.setKlassPopulationRepresentativeForTest0(CHAIN_LINK_TEST_KLASS_ID, gcRootHolder.get(0)); + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( + CHAIN_LINK_TEST_KLASS_ID, gcRootHolder.get(0)); if (!seededTestKlassTrend) { // Per-(klass, tid) qualification seeds - the persistent allocator // thread owns every ChainLink allocation, so ITS tid is the @@ -515,12 +525,14 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { // slope - the candidate keeps qualifying organically the whole // run, the real signal seamlessly taking over from the seeds. for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - JavaProfiler.seedKlassPopulationSample0(CHAIN_LINK_TEST_KLASS_ID, epoch, epoch); - JavaProfiler.seedTidTrendSample0(CHAIN_LINK_TEST_KLASS_ID, leakTid, epoch, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0( + CHAIN_LINK_TEST_KLASS_ID, epoch, epoch); + ReferenceChainTestHooks.seedTidTrendSample0( + CHAIN_LINK_TEST_KLASS_ID, leakTid, epoch, epoch); } seededTestKlassTrend = true; } - JavaProfiler.pollReferenceChainTargets0(); + ReferenceChainTestHooks.pollReferenceChainTargets0(); dump(scratchDumpPath); match = ReferenceChainAssertions.findMatchForClass(verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false), ChainLink.class); } @@ -642,10 +654,11 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc // accumulated a positive slope for during shouldReconstructReferrerChainToGcRoot() can still // outrank CachedPayload as the leak candidate here, so the fresh search below ends up // reconstructing ChainLink's chain again instead of CachedPayload's. - JavaProfiler.resetKlassPopulationForTest0(); - JavaProfiler.resetReferenceChainSearchForTest0(); + ReferenceChainTestHooks.resetKlassPopulationForTest0(); + ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); } Path scratchDumpPath = Paths.get("referencechains-cache-leak-scratch.jfr"); + Thread allocator = null; try { // Same round-growth/retry shape as shouldReconstructReferrerChainToGcRoot() - see that // method's own comment for why the loop self-adjusts rather than committing to a fixed @@ -676,7 +689,40 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc keys[i] = "leak-" + i; } - int nextKey = 0; + // One persistent allocator thread for every round - same shape and rationale as + // shouldReconstructReferrerChainToGcRoot()'s allocator (see its comment): created after + // Profiler::start() so SampledObjectAlloc fires for its allocations, and - decisively - + // every CachedPayload (including the keys[0] representative set below) carries THIS + // thread's profiler tid, which is the tid the per-(klass, tid) seeds must name: + // tagLeakInstances() only tags instances allocated by a qualifying tid. Only this thread + // mutates cache, and only between a request's take() and its roundDone.release(); the + // main thread reads cache only after awaitAllocatorRound() returns (happens-before via + // the queue and the semaphore). + LinkedBlockingQueue allocRequests = new LinkedBlockingQueue<>(); + Semaphore roundDone = new Semaphore(0); + AtomicLong allocatorTid = new AtomicLong(-1); + AtomicReference allocatorFailure = new AtomicReference<>(); + allocator = new Thread(() -> { + try { + allocatorTid.set(ReferenceChainTestHooks.getTid()); + int next = 0; // allocator-owned key cursor; keys[] was sized for every round up front + Integer requested; + while ((requested = allocRequests.take()) != null) { + for (int i = 0; i < requested; i++) { + String key = keys[next++]; + cache.put(key, new CachedPayload(key)); + } + roundDone.release(); + } + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); // test shutdown - see finally below + } catch (Throwable t) { + allocatorFailure.set(t); // surfaced by awaitAllocatorTid()/awaitAllocatorRound() + } + }, "cacheleak-allocator"); + allocator.start(); + awaitAllocatorTid(allocator, allocatorTid, allocatorFailure); + for (int round = 1; round <= totalRounds && match == null; round++) { // Matches shouldReconstructReferrerChainToGcRoot()'s own *600 growth rate (not *300, this // method's previous value) - CachedPayload and ChainLink are near-identical in size (same @@ -685,16 +731,10 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc // CachedPayload's own population ring stall short of KLASS_POPULATION_MIN_FILL_FOR_TREND // within the same totalRounds budget both methods share. int newEntries = Math.min(round, 10) * 600; - int keyOffset = nextKey; - Thread allocator = new Thread(() -> { - for (int i = 0; i < newEntries; i++) { - String key = keys[keyOffset + i]; - cache.put(key, new CachedPayload(key)); - } - }); - allocator.start(); - allocator.join(); - nextKey += newEntries; + if (!allocRequests.offer(newEntries)) { + throw new IllegalStateException("allocRequests queue rejected entry count " + newEntries); + } + awaitAllocatorRound(roundDone, allocator, allocatorFailure); System.gc(); dump(scratchDumpPath); JfrEvents events1 = verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false); @@ -711,19 +751,24 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc // sawtooth and destroy the positive-slope signal instead of just re-establishing it. // Representative BEFORE seeding - same real-id aliasing rationale as // shouldReconstructReferrerChainToGcRoot()'s own comment above. - JavaProfiler.setKlassPopulationRepresentativeForTest0(CACHED_PAYLOAD_TEST_KLASS_ID, cache.get(keys[0])); + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( + CACHED_PAYLOAD_TEST_KLASS_ID, cache.get(keys[0])); if (!seededTestKlassTrend) { - // Per-(klass, tid) qualification seeds - see LeakingCacheScenario's - // own seeding block for why this thread's tid (the representative's - // creator) is the qualifying one for the one-cohort-per-round shape. - int leakTid = JavaProfiler.getTid(); + // Per-(klass, tid) qualification seeds name the persistent allocator + // thread's tid: it allocated every CachedPayload, including the keys[0] + // representative, so it is the only tid whose tracked instances + // tagLeakInstances() can tag - NOT this JUnit worker's tid, which + // allocated none of them. + int leakTid = (int) allocatorTid.get(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - JavaProfiler.seedKlassPopulationSample0(CACHED_PAYLOAD_TEST_KLASS_ID, epoch * 10, epoch); - JavaProfiler.seedTidTrendSample0(CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch * 3, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0( + CACHED_PAYLOAD_TEST_KLASS_ID, epoch * 10, epoch); + ReferenceChainTestHooks.seedTidTrendSample0( + CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch * 3, epoch); } seededTestKlassTrend = true; } - JavaProfiler.pollReferenceChainTargets0(); + ReferenceChainTestHooks.pollReferenceChainTargets0(); dump(scratchDumpPath); JfrEvents events2 = verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false); match = ReferenceChainAssertions.findMatchForClass(events2, CachedPayload.class); @@ -770,6 +815,12 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc + "storage (cache is a HashMap) - chain was: " + match.chain); assertTrue(!cache.isEmpty()); // keeps every cached CachedPayload reachable until here } finally { + // Shut the persistent allocator down - shared, no-forkEvery test JVM (see the GcRoot + // test's own finally). + if (allocator != null) { + allocator.interrupt(); + allocator.join(1000); + } Files.deleteIfExists(scratchDumpPath); } } @@ -869,17 +920,19 @@ public void shouldReportAbandonedSearchOnTinyFrontierCap() throws Exception { } finally { Files.deleteIfExists(warmupDumpPath); } - JavaProfiler.resetKlassPopulationForTest0(); + ReferenceChainTestHooks.resetKlassPopulationForTest0(); // Per-(klass, tid) qualification seeds - gate-only usage (this test // drives the search to ABANDONED and asserts on the abandon marker, no // tagged instance needs to match), so the tid is this thread's real one // but any distinct tid would do. - int abandonTid = JavaProfiler.getTid(); + int abandonTid = ReferenceChainTestHooks.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - JavaProfiler.seedKlassPopulationSample0(ABANDON_TEST_KLASS_ID, epoch * 10, epoch); - JavaProfiler.seedTidTrendSample0(ABANDON_TEST_KLASS_ID, abandonTid, epoch * 3, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0( + ABANDON_TEST_KLASS_ID, epoch * 10, epoch); + ReferenceChainTestHooks.seedTidTrendSample0( + ABANDON_TEST_KLASS_ID, abandonTid, epoch * 3, epoch); } - JavaProfiler.resetReferenceChainSearchForTest0(); + ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); } List gcRootHolder = new ArrayList<>(); gcRootHolder.add(new ChainLink("middle", new ChainLink("leaf"))); @@ -927,6 +980,53 @@ public void shouldReportAbandonedSearchOnTinyFrontierCap() throws Exception { assertTrue(!gcRootHolder.isEmpty()); // keeps gcRootHolder reachable until the dump above } + /** + * Bounded wait for a persistent allocator thread to publish its profiler tid: fails fast with + * the allocator's own failure cause, or if it exited/stalled without publishing, instead of + * hanging the shared test fork. + */ + private static void awaitAllocatorTid(Thread allocator, AtomicLong allocatorTid, + AtomicReference allocatorFailure) throws InterruptedException { + long deadline = System.nanoTime() + TimeUnit.MILLISECONDS.toNanos(ALLOCATOR_HANDOFF_TIMEOUT_MS); + while (allocatorTid.get() == -1) { + Throwable failure = allocatorFailure.get(); + if (failure != null) { + throw new AssertionError( + allocator.getName() + " failed before publishing its tid", failure); + } + if (!allocator.isAlive() && allocatorTid.get() == -1) { + throw new AssertionError(allocator.getName() + " exited without publishing its tid"); + } + if (System.nanoTime() - deadline > 0) { + throw new AssertionError(allocator.getName() + " did not publish its tid within " + + ALLOCATOR_HANDOFF_TIMEOUT_MS + "ms"); + } + Thread.sleep(1); + } + } + + /** Bounded wait for one allocator round; same fail-fast policy as awaitAllocatorTid(). */ + private static void awaitAllocatorRound(Semaphore roundDone, Thread allocator, + AtomicReference allocatorFailure) throws InterruptedException { + long deadline = System.nanoTime() + TimeUnit.MILLISECONDS.toNanos(ALLOCATOR_HANDOFF_TIMEOUT_MS); + while (!roundDone.tryAcquire(10, TimeUnit.MILLISECONDS)) { + Throwable failure = allocatorFailure.get(); + if (failure != null) { + throw new AssertionError(allocator.getName() + " failed mid-round", failure); + } + if (!allocator.isAlive()) { + if (roundDone.tryAcquire()) { + return; // released just before exiting + } + throw new AssertionError(allocator.getName() + " exited mid-round"); + } + if (System.nanoTime() - deadline > 0) { + throw new AssertionError(allocator.getName() + " did not finish its round within " + + ALLOCATOR_HANDOFF_TIMEOUT_MS + "ms"); + } + } + } + /** * Referrer-type fixture shared by both the success-path and abandonment-path tests. The 32 * {@code long} fields below exist purely so {@link #shouldReconstructReferrerChainToGcRoot()} diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java index a1251f5fed..18c47c20a4 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java @@ -6,6 +6,7 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.JavaProfiler; +import com.datadoghq.profiler.ReferenceChainTestHooks; import org.openjdk.jmc.common.item.IItemCollection; import org.openjdk.jmc.common.item.ItemFilters; import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit; @@ -90,7 +91,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // Snapshotted BEFORE seeding anything, while the BFS thread's search has not run a single // pass yet (referenceChainPassesRunForTest0() reads 0 here) - see the wait loop below for why // this exact value, not just "nonzero", is what the wait needs to advance past. - int initialPasses = debugBuild ? JavaProfiler.referenceChainPassesRunForTest0() : -1; + int initialPasses = debugBuild ? ReferenceChainTestHooks.referenceChainPassesRunForTest0() : -1; if (debugBuild) { // Seed enough hysteresis-qualifying epochs to unlock ReferenceChainTracker::hasLeakSignal()/ @@ -105,10 +106,12 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // seeding block for the rationale): the qualifying tid must be the thread that // allocates the tracked instances - this thread allocates every LEAK_BUFFER // chunk, including the lateChunk this scenario watches. - leakTid = JavaProfiler.getTid(); + leakTid = ReferenceChainTestHooks.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - JavaProfiler.seedKlassPopulationSample0(LEAK_BUFFER_TEST_KLASS_ID, epoch * 10, epoch); - JavaProfiler.seedTidTrendSample0(LEAK_BUFFER_TEST_KLASS_ID, leakTid, epoch * 3, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0( + LEAK_BUFFER_TEST_KLASS_ID, epoch * 10, epoch); + ReferenceChainTestHooks.seedTidTrendSample0( + LEAK_BUFFER_TEST_KLASS_ID, leakTid, epoch * 3, epoch); } hysteresisEpoch = SEED_EPOCHS_FOR_HYSTERESIS; } @@ -143,7 +146,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // generous margin for the same reason ExternalProcessReferenceChainTest's own budget/ // pausetarget are raised this far above the in-process test's defaults. for (int i = 0; i < 300 && !passCompleted; i++) { - passCompleted = JavaProfiler.referenceChainPassesRunForTest0() != initialPasses; + passCompleted = ReferenceChainTestHooks.referenceChainPassesRunForTest0() != initialPasses; if (!passCompleted) { Thread.sleep(100); } @@ -160,7 +163,8 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // Snapshotted right after the wait above confirms the first pass has fully completed - any // later change (advance, or reset-to-lower via a restart) proves a walk that started strictly // after lateChunk existed. - int passesRunBeforeLateChunk = debugBuild ? JavaProfiler.referenceChainPassesRunForTest0() : -1; + int passesRunBeforeLateChunk = + debugBuild ? ReferenceChainTestHooks.referenceChainPassesRunForTest0() : -1; byte[] lateChunk = new byte[CHUNK_BYTES]; LEAK_BUFFER.add(lateChunk); @@ -206,12 +210,13 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // still leaves enough remaining rounds to reach it, rather than exhausting a fixed budget // of calls before ever getting there. hysteresisEpoch++; - JavaProfiler.seedKlassPopulationSample0( + ReferenceChainTestHooks.seedKlassPopulationSample0( LEAK_BUFFER_TEST_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - JavaProfiler.seedTidTrendSample0( + ReferenceChainTestHooks.seedTidTrendSample0( LEAK_BUFFER_TEST_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); - JavaProfiler.setKlassPopulationRepresentativeForTest0(LEAK_BUFFER_TEST_KLASS_ID, lateChunk); - JavaProfiler.pollReferenceChainTargets0(); + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( + LEAK_BUFFER_TEST_KLASS_ID, lateChunk); + ReferenceChainTestHooks.pollReferenceChainTargets0(); // Only TRUST a match once passesRun() has genuinely changed since the snapshot taken right // before lateChunk was created - either advanced (the same, never-restarted search ran a @@ -221,7 +226,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // one race this whole seam exists to rule out: the very first, still-in-flight pass finding // lateChunk by accident because admitStaticFieldRoots() and expandFrontier() are two steps // of that SAME call, and Java can observe the former's completion before the latter runs. - if (JavaProfiler.referenceChainPassesRunForTest0() != passesRunBeforeLateChunk) { + if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() != passesRunBeforeLateChunk) { profiler.dump(scratchDumpPath); match = findMatch(scratchDumpPath); } @@ -250,7 +255,8 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD // Same passesRun()-advanced check as the round loop above (debug builds only) - by this // point in a real run it has virtually always already flipped, but there is no reason to // drop the guarantee here just because the round loop above didn't need it. - if (debugBuild && JavaProfiler.referenceChainPassesRunForTest0() == passesRunBeforeLateChunk) { + if (debugBuild + && ReferenceChainTestHooks.referenceChainPassesRunForTest0() == passesRunBeforeLateChunk) { continue; } profiler.dump(scratchDumpPath); diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java index b0f2e10ee2..c99dde097b 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java @@ -6,6 +6,7 @@ package com.datadoghq.profiler.referencechains; import com.datadoghq.profiler.JavaProfiler; +import com.datadoghq.profiler.ReferenceChainTestHooks; import org.openjdk.jmc.common.IMCType; import org.openjdk.jmc.common.item.IItem; import org.openjdk.jmc.common.item.IItemCollection; @@ -108,11 +109,12 @@ byte[] take() { } /** - * Bounded wait for the leak thread's first publish. Only the - * late-thread mode needs it: there the thread is started after the - * profiler (and thus after {@code profiler.execute()} returned), so the - * main thread cannot rely on the start-command's JNI work having - * scheduled the leak thread far enough to publish. + * Bounded wait for the leak thread's first publish. Both modes need it: + * in the late-thread mode the thread is started only after + * {@code profiler.execute()} returned, and in the default mode the leak + * thread must still allocate {@code SEED_CHUNKS} chunks before it + * publishes - so neither mode can assume publication has happened by the + * time the main thread seeds. */ boolean awaitPublication(long timeoutMs) throws InterruptedException { long deadline = System.nanoTime() @@ -181,7 +183,7 @@ public static void run(JavaProfiler profiler, String startCommand, for (int i = 0; i < SEED_CHUNKS; i++) { sink.add(new byte[CHUNK_BYTES]); } - handoff.publish(JavaProfiler.getTid(), sink.get(0)); + handoff.publish(ReferenceChainTestHooks.getTid(), sink.get(0)); while (true) { try { if (rounds.poll(50, TimeUnit.MILLISECONDS) == null) { @@ -204,12 +206,13 @@ public static void run(JavaProfiler profiler, String startCommand, if (lateThread) { leakThread.start(); - // The debug seeding below consumes the handoff immediately; the - // thread is only just started, so wait for its first publish. - if (!handoff.awaitPublication(30000)) { - System.out.println(NOT_FOUND_MARKER); - return; - } + } + // The debug seeding below consumes the handoff immediately; in both modes + // the leak thread must first allocate SEED_CHUNKS chunks before it + // publishes, so wait (bounded) for its first publish rather than race it. + if (!handoff.awaitPublication(30000)) { + System.out.println(NOT_FOUND_MARKER); + return; } boolean debugBuild = "debug".equals(System.getProperty("ddprof_test.config")); @@ -220,22 +223,27 @@ public static void run(JavaProfiler profiler, String startCommand, // seeds or the seeds authorize nothing). The rep chunk stays durably // reachable only through the leak thread's ThreadLocalMap - the // take() above dropped this handoff's reference. - JavaProfiler.setKlassPopulationRepresentativeForTest0(LEAK_KLASS_ID, handoff.take()); + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( + LEAK_KLASS_ID, handoff.take()); leakTid = handoff.tid; for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - JavaProfiler.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); - JavaProfiler.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, epoch * 3, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); + ReferenceChainTestHooks.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, epoch * 3, epoch); } + // Continue the rising epoch sequence past the seeded range so each + // per-round maintenance seed below pushes a fresh, strictly increasing + // epoch (same as StaticFieldGrowingCollectionScenario). + hysteresisEpoch = SEED_EPOCHS_FOR_HYSTERESIS; // Wait for the BFS thread's first full pass, then poll - same // load-bearing wait as LeakTagCorrelationScenario. - int initialPasses = JavaProfiler.referenceChainPassesRunForTest0(); + int initialPasses = ReferenceChainTestHooks.referenceChainPassesRunForTest0(); for (int i = 0; i < 300; i++) { - if (JavaProfiler.referenceChainPassesRunForTest0() != initialPasses) { + if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() != initialPasses) { break; } Thread.sleep(100); } - JavaProfiler.pollReferenceChainTargets0(); + ReferenceChainTestHooks.pollReferenceChainTargets0(); } else { Thread.sleep(5000); } @@ -248,9 +256,10 @@ public static void run(JavaProfiler profiler, String startCommand, } if (debugBuild) { hysteresisEpoch++; - JavaProfiler.seedKlassPopulationSample0( + ReferenceChainTestHooks.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - JavaProfiler.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); + ReferenceChainTestHooks.seedTidTrendSample0( + LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); } Thread.sleep(300); System.gc(); @@ -272,9 +281,10 @@ public static void run(JavaProfiler profiler, String startCommand, } if (debugBuild) { hysteresisEpoch++; - JavaProfiler.seedKlassPopulationSample0( + ReferenceChainTestHooks.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - JavaProfiler.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); + ReferenceChainTestHooks.seedTidTrendSample0( + LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); } if (!rounds.offer(attempt)) { throw new IllegalStateException( @@ -301,14 +311,30 @@ public static void run(JavaProfiler profiler, String startCommand, System.out.println(FOUND_MARKER + best.payloadChain.targetTag); } + /** + * Monotonic: never downgrades an already better result (e.g. a fully + * correlated in-pool chain) to a later out-of-pool/unmatched scan; at equal + * quality the newer scan wins. + */ private static ScanResult keepBest(ScanResult best, ScanResult scan) { if (scan == null) { return best; } - if (scan.payloadChain != null) { + if (best == null) { return scan; } - return best != null ? best : scan; + return quality(scan) >= quality(best) ? scan : best; + } + + /** 0: no chain, 1: out-of-pool chain, 2: in-pool chain, 3: in-pool and correlated. */ + private static int quality(ScanResult r) { + if (r == null || r.payloadChain == null) { + return 0; + } + if (!r.payloadChainInPool) { + return 1; + } + return r.liveObjectMatchesForChainTag > 0 ? 3 : 2; } /** diff --git a/utils/compare-refchains-repro.sh b/utils/compare-refchains-repro.sh index 0eaee3c90f..1fa8a43045 100755 --- a/utils/compare-refchains-repro.sh +++ b/utils/compare-refchains-repro.sh @@ -112,8 +112,11 @@ read -r on_entries on_avg_round on_max_round on_heap_growth on_stw_count on_stw_ read -r off_entries off_avg_round off_max_round off_heap_growth off_stw_count off_stw_total off_stw_avg off_stw_max off_rss off_wall \ <<< "$(parse_variant "off")" -# Percentage delta of "on" relative to "off": positive means "on" is worse -# (slower/longer-paused/more memory). Guards div-by-zero by falling back to 0. +# Percentage delta of "on" relative to "off", (on - off) / off, for every row +# alike: positive means "on" measured higher - worse for the cost metrics +# (latency, STW, memory), BETTER for throughput (entries/sec, higher is +# better), so a throughput cost shows up as a negative delta. Guards +# div-by-zero by printing "n/a". pct_delta() { awk -v on="$1" -v off="$2" 'BEGIN { if (off == 0) { printf "n/a"; exit } @@ -121,7 +124,7 @@ pct_delta() { }' } -throughput_delta_pct=$(pct_delta "${off_entries}" "${on_entries}") # off/on: lower throughput with refchains on is the "cost" +throughput_delta_pct=$(pct_delta "${on_entries}" "${off_entries}") # negative = lower throughput with refchains on avg_round_delta_pct=$(pct_delta "${on_avg_round}" "${off_avg_round}") stw_total_delta_pct=$(pct_delta "${on_stw_total}" "${off_stw_total}") stw_max_delta_pct=$(pct_delta "${on_stw_max}" "${off_stw_max}") @@ -139,7 +142,7 @@ REPORT="${WORKDIR}/report.md" echo echo "| metric | on (refchains=true) | off (refchains=false) | delta (on vs. off) |" echo "|---|---|---|---|" - echo "| entries/sec (throughput) | ${on_entries} | ${off_entries} | ${throughput_delta_pct} |" + echo "| entries/sec (throughput, higher is better) | ${on_entries} | ${off_entries} | ${throughput_delta_pct} |" echo "| avg round latency (ms) | ${on_avg_round} | ${off_avg_round} | ${avg_round_delta_pct} |" echo "| max round latency (ms) | ${on_max_round} | ${off_max_round} | - |" echo "| safepoint count | ${on_stw_count} | ${off_stw_count} | - |" @@ -150,7 +153,7 @@ REPORT="${WORKDIR}/report.md" echo echo "## Answers" echo - echo "- **Slower overall?** throughput ${throughput_delta_pct}, avg round latency ${avg_round_delta_pct} with referencechains on." + echo "- **Slower overall?** throughput ${throughput_delta_pct} (negative = lower throughput), avg round latency ${avg_round_delta_pct} (positive = slower) with referencechains on." echo "- **Lengthy STW safepoints?** total stop time ${stw_total_delta_pct}, longest single pause ${on_stw_max}s (vs. ${off_stw_max}s off)." echo "- **Memory usage up significantly?** heap grew ${heap_growth_delta_mb} MB more, peak RSS ${rss_delta_pct} (${rss_delta_kb} KB) with referencechains on." } > "${REPORT}" diff --git a/utils/refchains-report-multi.py b/utils/refchains-report-multi.py index 666eb7c13c..d3d381abb1 100644 --- a/utils/refchains-report-multi.py +++ b/utils/refchains-report-multi.py @@ -10,6 +10,7 @@ import html import json import os +import sys ACCENT = "#2a78d6" # dataviz palette categorical slot 1 ("blue") - one series per chart, no legend needed GRID = "#dedcd3" @@ -43,6 +44,11 @@ def fnum(s): try: return float(s) except (TypeError, ValueError): + # Coercing an unparsable CSV cell to 0.0 lets the chart render + # instead of crashing, but a silent 0.0 looks like a real + # measurement - flag it so a malformed sweep row doesn't masquerade + # as a genuine zero data point (same as refchains-report.py). + print(f"warning: could not parse {s!r} as a number, using 0.0", file=sys.stderr) return 0.0 @@ -221,7 +227,7 @@ def main():

      reference-chains OFAT budget-knob sweep

      -
      JDK: {html.escape(str(args.jdk))}  |  GC: {html.escape(str(args.gc))}  |  duration/point: {html.escape(str(args.duration))}s  |  one-factor-at-a-time: each knob swept independently, others left at their built-in defaults
      +
      JDK: {html.escape(str(args.jdk))}  |  GC: {html.escape(str(args.gc))}  |  duration/point: {html.escape(str(args.duration))}s  |  one-factor-at-a-time: each knob swept independently, the others held at run-refchains-repro.sh's baked baseline (budget=10000, pausetarget=500, painbudget=100; firstpassbudget auto-scaled)
      {"".join(tabs_nav)}
      {"".join(tabs_content)}
      diff --git a/utils/run-refchains-repro.sh b/utils/run-refchains-repro.sh index 1425bd9ef0..af57c5ac38 100755 --- a/utils/run-refchains-repro.sh +++ b/utils/run-refchains-repro.sh @@ -28,8 +28,11 @@ # REFCHAINS_ENABLED "true" (default) or "false" - toggles the # referencechains=... agent sub-option itself, for A/B # comparison against a baseline with the feature off. -# REFCHAINS_ARGS extra referencechains=... sub-options appended after the -# baked-in defaults below (e.g. "hops=32") +# REFCHAINS_ARGS extra referencechains=... sub-options (e.g. "hops=32"), +# appended after the baked-in baseline (BAKED_REFCHAINS_OPTS +# below). Any baked key REFCHAINS_ARGS also sets is dropped +# from the baseline, so the caller's value is the only +# occurrence of that key in the final option string. # REFCHAINS_JAVA_HOME JDK home to launch the repro with (default: "java" on # PATH). Lets you A/B a specific JDK, e.g. to reproduce a # version-specific VMStructs bug: REFCHAINS_JAVA_HOME=/usr/local/sdkman/candidates/java/25.0.3-tem @@ -105,17 +108,33 @@ fi echo "Using jar: ${REFCHAINS_JAR}" # No firstpassbudget here: the tracker auto-scales the first pass's budget -# from budget=4000 (currently x50, capped at 200000 - referenceChains.h) so -# it can actually reach this app's leaking population. Pass -# REFCHAINS_ARGS="firstpassbudget=N" to override that auto-scaled default. +# from the baked budget=10000 below (x AUTO_FIRST_PASS_BUDGET_MULTIPLIER = 50, +# capped at AUTO_FIRST_PASS_BUDGET_CAP = 200000 - referenceChains.h - so the +# effective first-pass budget is 200000) so it can actually reach this app's +# leaking population. Pass REFCHAINS_ARGS="firstpassbudget=N" to override that +# auto-scaled default. REFCHAINS_ENABLED="${REFCHAINS_ENABLED:-true}" -REFERENCECHAINS_OPTS="${REFCHAINS_ENABLED}:hops=64:budget=10000:ttl=120000:framecap=2000000:pausetarget=500:painbudget=100" -if [ -n "${REFCHAINS_ARGS:-}" ]; then - REFERENCECHAINS_OPTS="${REFERENCECHAINS_OPTS}:${REFCHAINS_ARGS}" -fi +BAKED_REFCHAINS_OPTS="hops=64:budget=10000:ttl=120000:framecap=2000000:pausetarget=500:painbudget=100" +# Drop every baked key that REFCHAINS_ARGS also sets. arguments.cpp parses the +# referencechains sub-options left to right and each key simply overwrites its +# field (last occurrence wins, keys matched case-insensitively), so appending a +# duplicate would work today - but dropping it keeps the final string +# duplicate-free and the effective value unambiguous to anyone reading it. +# (Plain read/case/tr only: bash 3.2 - macOS's /bin/bash - has no ${var,,}.) +REFCHAINS_ARGS_LC=":$(printf '%s' "${REFCHAINS_ARGS:-}" | tr '[:upper:]' '[:lower:]')" +EFFECTIVE_BAKED_OPTS="" +IFS=':' read -r -a BAKED_KVS <<< "${BAKED_REFCHAINS_OPTS}" +for kv in "${BAKED_KVS[@]}"; do + case "${REFCHAINS_ARGS_LC}" in + *":${kv%%=*}="*) echo "Baked ${kv} overridden by REFCHAINS_ARGS" ; continue ;; + esac + EFFECTIVE_BAKED_OPTS="${EFFECTIVE_BAKED_OPTS:+${EFFECTIVE_BAKED_OPTS}:}${kv}" +done +REFERENCECHAINS_OPTS="${REFCHAINS_ENABLED}${EFFECTIVE_BAKED_OPTS:+:${EFFECTIVE_BAKED_OPTS}}${REFCHAINS_ARGS:+:${REFCHAINS_ARGS}}" echo "JFR output: ${JFR_OUT}" echo "referencechains enabled: ${REFCHAINS_ENABLED}" +echo "referencechains options: ${REFERENCECHAINS_OPTS}" rm -f "${JFR_OUT}" JAVA_LOG_OPTS=() diff --git a/utils/sweep-refchains-all.sh b/utils/sweep-refchains-all.sh index 76cd7b7f73..a38d286994 100644 --- a/utils/sweep-refchains-all.sh +++ b/utils/sweep-refchains-all.sh @@ -2,12 +2,16 @@ # # One-factor-at-a-time (OFAT) sweep across all four referencechains budget # knobs (budget, firstpassbudget, pausetarget, painbudget): for each knob, -# sweeps its own value list while holding the other three at their built-in -# defaults (i.e. omitted from the sub-option string, letting the tracker's -# own defaults/auto-scaling apply - see referenceChains.h). A full cartesian -# product across all four knobs is combinatorially far more runs for little -# extra insight over OFAT at this stage, so this is deliberately OFAT, not a -# grid search. +# sweeps its own value list while holding the other three at +# run-refchains-repro.sh's baked baseline (BAKED_REFCHAINS_OPTS there: +# budget=10000, pausetarget=500, painbudget=100 - NOT the tracker's built-in +# arguments.h defaults; firstpassbudget is not baked, so it stays auto-scaled +# from budget - see referenceChains.h's AUTO_FIRST_PASS_BUDGET_*). The swept +# knob replaces its baked value (run-refchains-repro.sh drops a baked key that +# REFCHAINS_ARGS also sets), so each point runs exactly one occurrence of it. +# A full cartesian product across all four knobs is combinatorially far more +# runs for little extra insight over OFAT at this stage, so this is +# deliberately OFAT, not a grid search. # # Writes one combined CSV (knob,param_value,) covering all four # sweeps, then renders it via refchains-report-multi.py into a single @@ -20,8 +24,11 @@ # run-refchains-repro.sh - passed through unchanged # to every run so all sweeps stay comparable. # REFCHAINS_ARGS extra referencechains=... sub-options held fixed -# across every run (in addition to the defaults -# baked into run-refchains-repro.sh). +# across every run (in addition to the baseline +# baked into run-refchains-repro.sh). A key here +# that is also the knob being swept is dropped (with +# a WARN) for that knob's runs, so the swept value is +# never shadowed by, or duplicated with, a fixed one. set -euo pipefail @@ -29,6 +36,30 @@ HERE="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )" DURATION_SECONDS="${1:-60}" +# Caller's fixed sub-options, captured once: REFCHAINS_ARGS itself is rebuilt +# per run below (swept knob + these). +FIXED_REFCHAINS_ARGS="${REFCHAINS_ARGS:-}" + +# Prints FIXED_REFCHAINS_ARGS minus any "=..." entry (key matched +# case-insensitively, like arguments.cpp), warning on stderr for each one +# dropped - stdout is the result, captured by the caller. +fixed_args_without() { + local drop="$1" out="" kv key + local parts=() + if [ -n "${FIXED_REFCHAINS_ARGS}" ]; then + IFS=':' read -r -a parts <<< "${FIXED_REFCHAINS_ARGS}" + fi + for kv in ${parts[@]+"${parts[@]}"}; do + key=$(printf '%s' "${kv%%=*}" | tr '[:upper:]' '[:lower:]') + if [ "${key}" = "${drop}" ]; then + echo "WARN: ignoring REFCHAINS_ARGS entry '${kv}' while sweeping ${drop}" >&2 + continue + fi + out="${out:+${out}:}${kv}" + done + printf '%s' "${out}" +} + KNOBS=(budget firstpassbudget pausetarget painbudget) declare -A KNOB_VALUES=( [budget]="${REFCHAINS_SWEEP_BUDGET_VALUES:-1000,4000,10000,40000,100000}" @@ -68,22 +99,29 @@ parse_run() { local metrics_line metrics_line=$(grep '^\[metrics\]' "${stdout}" || true) + # Every extraction below tolerates "no match" (`|| true`): under set -euo + # pipefail one crashed/truncated run would otherwise abort the whole OFAT + # sweep instead of recording that point as 0 and moving on. local wall_seconds entries_per_sec avg_round_ms max_round_ms heap_growth_mb - wall_seconds=$(echo "${metrics_line}" | grep -oE 'wallSeconds=[0-9.]+' | cut -d= -f2) - entries_per_sec=$(echo "${metrics_line}" | grep -oE 'entriesPerSec=[0-9.]+' | cut -d= -f2) - avg_round_ms=$(echo "${metrics_line}" | grep -oE 'avgRoundMs=[0-9.]+' | cut -d= -f2) - max_round_ms=$(echo "${metrics_line}" | grep -oE 'maxRoundMs=[0-9.]+' | cut -d= -f2) - heap_growth_mb=$(echo "${metrics_line}" | grep -oE 'heapGrowthMb=-?[0-9]+' | cut -d= -f2) + wall_seconds=$(echo "${metrics_line}" | grep -oE 'wallSeconds=[0-9.]+' | cut -d= -f2 || true) + entries_per_sec=$(echo "${metrics_line}" | grep -oE 'entriesPerSec=[0-9.]+' | cut -d= -f2 || true) + avg_round_ms=$(echo "${metrics_line}" | grep -oE 'avgRoundMs=[0-9.]+' | cut -d= -f2 || true) + max_round_ms=$(echo "${metrics_line}" | grep -oE 'maxRoundMs=[0-9.]+' | cut -d= -f2 || true) + heap_growth_mb=$(echo "${metrics_line}" | grep -oE 'heapGrowthMb=-?[0-9]+' | cut -d= -f2 || true) local stw_stats stw_stats=$(grep -oE 'Safepoint "[^"]+".*Total: [0-9]+ ns' "${safepoint_log}" 2>/dev/null \ | grep -oE 'Total: [0-9]+ ns' \ | grep -oE '[0-9]+' \ - | awk '{sec=$1/1e9; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + | awk '{sec=$1/1e9; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}' \ + || true) if [ -z "${stw_stats}" ]; then - stw_stats=$(grep -oE 'Total time for which application threads were stopped: [0-9.]+ seconds' "${safepoint_log}" 2>/dev/null \ - | grep -oE '[0-9.]+' \ - | awk '{sec=$1; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + # JDK <=16 shape. One sed capture of exactly the "stopped: N seconds" + # value per line (only matching lines are printed), rather than every + # numeric token on the line. + stw_stats=$(sed -nE 's/.*Total time for which application threads were stopped: ([0-9.]+) seconds.*/\1/p' "${safepoint_log}" 2>/dev/null \ + | awk '{sec=$1; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}' \ + || true) fi read -r stw_count stw_total stw_avg stw_max <<< "${stw_stats:-0 0 0 0}" @@ -115,7 +153,8 @@ for knob in "${KNOBS[@]}"; do echo echo "=== [${run_idx}/${TOTAL_RUNS}] ${knob}=${value} ===" - REFCHAINS_ENABLED="true" REFCHAINS_ARGS="${knob}=${value}${REFCHAINS_ARGS:+:${REFCHAINS_ARGS}}" \ + fixed_args="$(fixed_args_without "${knob}")" + REFCHAINS_ENABLED="true" REFCHAINS_ARGS="${knob}=${value}${fixed_args:+:${fixed_args}}" \ "${HERE}/run-refchains-repro.sh" "${jfr}" "${DURATION_SECONDS}" \ > "${WORKDIR}/${label}.stdout.log" 2>&1 & pid=$! diff --git a/utils/sweep-refchains-budgets.sh b/utils/sweep-refchains-budgets.sh index 1d795fb6e5..e25049c274 100644 --- a/utils/sweep-refchains-budgets.sh +++ b/utils/sweep-refchains-budgets.sh @@ -73,12 +73,15 @@ parse_run() { local metrics_line metrics_line=$(grep '^\[metrics\]' "${stdout}" || true) + # Every extraction below tolerates "no match" (`|| true`): under set -euo + # pipefail a missing field (crashed/truncated run) would otherwise abort the + # whole sweep instead of recording this point as 0 and moving on. local wall_seconds entries_per_sec avg_round_ms max_round_ms heap_growth_mb - wall_seconds=$(echo "${metrics_line}" | grep -oE 'wallSeconds=[0-9.]+' | cut -d= -f2) - entries_per_sec=$(echo "${metrics_line}" | grep -oE 'entriesPerSec=[0-9.]+' | cut -d= -f2) - avg_round_ms=$(echo "${metrics_line}" | grep -oE 'avgRoundMs=[0-9.]+' | cut -d= -f2) - max_round_ms=$(echo "${metrics_line}" | grep -oE 'maxRoundMs=[0-9.]+' | cut -d= -f2) - heap_growth_mb=$(echo "${metrics_line}" | grep -oE 'heapGrowthMb=-?[0-9]+' | cut -d= -f2) + wall_seconds=$(echo "${metrics_line}" | grep -oE 'wallSeconds=[0-9.]+' | cut -d= -f2 || true) + entries_per_sec=$(echo "${metrics_line}" | grep -oE 'entriesPerSec=[0-9.]+' | cut -d= -f2 || true) + avg_round_ms=$(echo "${metrics_line}" | grep -oE 'avgRoundMs=[0-9.]+' | cut -d= -f2 || true) + max_round_ms=$(echo "${metrics_line}" | grep -oE 'maxRoundMs=[0-9.]+' | cut -d= -f2 || true) + heap_growth_mb=$(echo "${metrics_line}" | grep -oE 'heapGrowthMb=-?[0-9]+' | cut -d= -f2 || true) # Two -Xlog safepoint line shapes across JDK versions: # - JDK 17+: `Safepoint "name", ... Total: N ns` (one line, everything on it) @@ -90,11 +93,15 @@ parse_run() { stw_stats=$(grep -oE 'Safepoint "[^"]+".*Total: [0-9]+ ns' "${safepoint_log}" 2>/dev/null \ | grep -oE 'Total: [0-9]+ ns' \ | grep -oE '[0-9]+' \ - | awk '{sec=$1/1e9; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + | awk '{sec=$1/1e9; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}' \ + || true) if [ -z "${stw_stats}" ]; then + # Capture exactly the "stopped: N seconds" value (one per line), not every + # numeric token on the line. stw_stats=$(grep -oE 'Total time for which application threads were stopped: [0-9.]+ seconds' "${safepoint_log}" 2>/dev/null \ - | grep -oE '[0-9.]+' \ - | awk '{sec=$1; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + | sed -E 's/.*stopped: ([0-9.]+) seconds.*/\1/' \ + | awk '{sec=$1; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}' \ + || true) fi read -r stw_count stw_total stw_avg stw_max <<< "${stw_stats:-0 0 0 0}" From 9ffea55c93f35187ba76e7fa8b93afc188e9eb39 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Mon, 12 Oct 2026 10:35:36 +0200 Subject: [PATCH 05/17] ReferenceChainJfrParserTest: skip when the gtest fixture is absent The roundtrip JFR fixture is produced by referenceChainJfrRoundtrip_ut, which does not run on CI runners without Google Test (e.g. the el7 testRelease job); asserting its existence failed the job there. Assume instead of assert so the test skips where the gtest artifact is unavailable and still executes wherever the gtest ran. --- .../ReferenceChainJfrParserTest.java | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java index d33072a588..60b4f118d9 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java @@ -5,6 +5,7 @@ package com.datadoghq.profiler.referencechains; +import org.junit.jupiter.api.Assumptions; import org.junit.jupiter.api.Test; import org.openjdk.jmc.common.IMCType; import org.openjdk.jmc.common.item.IAccessorKey; @@ -14,6 +15,7 @@ import org.openjdk.jmc.common.item.IMemberAccessor; import org.openjdk.jmc.common.item.IType; import org.openjdk.jmc.common.item.ItemFilters; +import org.openjdk.jmc.common.unit.IQuantity; import org.openjdk.jmc.flightrecorder.CouldNotLoadRecordingException; import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit; @@ -82,7 +84,13 @@ private static Path roundtripJfrPath() { public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() throws IOException, CouldNotLoadRecordingException { Path jfrPath = roundtripJfrPath(); - assertTrue(Files.exists(jfrPath), + // Assumption, not assertion: the fixture is produced by the companion gtest + // (referenceChainJfrRoundtrip_ut.cpp), which does not run on CI runners + // without Google Test (e.g. the el7 testRelease job) - there the file can + // never exist and this test would fail spuriously. Where the gtest ran in + // the same Gradle invocation (local testDebug, gtest-equipped CI jobs), the + // file exists and the test executes; otherwise it is skipped. + Assumptions.assumeTrue(Files.exists(jfrPath), "Expected " + jfrPath + " to exist - run " + ":ddprof-lib:gtestDebug_referenceChainJfrRoundtrip_ut first " + "(referenceChainJfrRoundtrip_ut.cpp produces this file)."); @@ -149,16 +157,16 @@ public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() Object v = targetTagAccessor.getMember(item); if (v instanceof Number) { targetTag = ((Number) v).longValue(); - } else if (v instanceof org.openjdk.jmc.common.unit.IQuantity) { - targetTag = ((org.openjdk.jmc.common.unit.IQuantity) v).longValue(); + } else if (v instanceof IQuantity) { + targetTag = ((IQuantity) v).longValue(); } } if (depthAccessor != null) { Object v = depthAccessor.getMember(item); if (v instanceof Number) { depth = ((Number) v).intValue(); - } else if (v instanceof org.openjdk.jmc.common.unit.IQuantity) { - depth = (int) ((org.openjdk.jmc.common.unit.IQuantity) v).longValue(); + } else if (v instanceof IQuantity) { + depth = (int) ((IQuantity) v).longValue(); } } break; // referenceChainJfrRoundtrip_ut.cpp writes exactly one event From afd6fcee4c4a86c890cde1543cb9a6ec016a68bd Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Tue, 13 Oct 2026 08:49:39 +0200 Subject: [PATCH 06/17] Compress comment density in the reference-chain test stack Comment-only rewrite of nine reference-chain test and hook files (assertions, seams test, scenarios, launcher, test hooks, JavaProfiler seam javadocs) to match the hand-written style of the rest of the suite. No code changes. Humanize pass over jb/rc-7-tooling. --- .../com/datadoghq/profiler/JavaProfiler.java | 52 +++--- .../datadoghq/profiler/ExternalLauncher.java | 58 +++--- .../profiler/ReferenceChainTestHooks.java | 6 +- .../ExternalProcessReferenceChainTest.java | 92 ++++------ .../LeakTagCorrelationReferenceChainTest.java | 73 ++++---- .../referencechains/LeakingCacheScenario.java | 167 +++++++----------- .../ReferenceChainAssertions.java | 40 ++--- .../ReferenceChainTestSeamsTest.java | 166 ++++++----------- .../StaticFieldGrowingCollectionScenario.java | 131 +++++--------- 9 files changed, 294 insertions(+), 491 deletions(-) diff --git a/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java b/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java index 1fcf7e2ddf..85dd582360 100644 --- a/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java +++ b/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java @@ -463,13 +463,10 @@ public Map getDebugCounters() { private static native int getTid0(); /** - * Test seam (debug native builds only): returns the calling thread's profiler tid - * (ProfiledThread::currentTid()'s value on the native side - the same tid space - * {@code seedTidTrendSample0} matches tracked instances' allocating threads - * against). Scenarios seeding per-(klass, tid) trend ramps must call this ON - * the leaking thread and pass the result to {@code seedTidTrendSample0}, or - * the qualifying tid will match no tracked instance and no leak tag will - * ever be assigned to the scenario's real instances. + * Test seam (debug native builds only): returns the calling thread's profiler tid - the same + * tid space {@code seedTidTrendSample0} matches tracked instances' allocating threads against. + * Scenarios seeding per-(klass, tid) ramps must call this ON the leaking thread, or the + * qualifying tid matches no tracked instance and no leak tag is ever assigned. */ static int getTid() { return getTid0(); @@ -550,12 +547,10 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l * process-wide profiler singleton, so they must not be callable by application code * sharing the JVM with a debug native build. Tests outside this package reach them only * through the test-source bridge {@code com.datadoghq.profiler.ReferenceChainTestHooks} - * (ddprof-test), same pattern as {@code ProfilerOwnedBlockHooks}. - *

      - * Decouples LivenessTracker's leak-candidate - * detection from ReferenceChainTracker's chain reconstruction, each independently - * verifiable end-to-end without depending on both the probabilistic JVMTI heap - * sampler and the reference-chain BFS search organically producing the right + * (ddprof-test), same pattern as {@code ProfilerOwnedBlockHooks}. Collectively the seams + * decouple LivenessTracker's leak-candidate detection from ReferenceChainTracker's chain + * reconstruction, so each is verifiable end-to-end without depending on both the + * probabilistic JVMTI heap sampler and the BFS search organically producing the right * conditions in the same test run. *

      * Enables/disables LivenessTracker's per-klass population tracking directly, @@ -575,25 +570,20 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l static native void seedKlassPopulationSample0(int klassId, int count, long epoch); /** - * Test seam (debug native builds only): seeds one epoch's worth of per-tid trend - * history for {@code klassId}, the (klass, tid) qualification - * selectLeakCandidates() now requires on top of the klass-level ramp seeded by - * {@link #seedKlassPopulationSample0}. Repeated calls with the same rising shape - * (and the same {@code tid}) build the sustained rise that qualifies {@code tid} - * as a leak-site thread. {@code tid} must be the leaking thread's real profiler - * tid from {@link #getTid()} whenever the scenario also relies on leak tagging - * of real tracked instances; see that method's own comment. + * Test seam (debug native builds only): seeds one epoch's worth of per-tid trend history for + * {@code klassId} - the (klass, tid) qualification selectLeakCandidates() requires on top of + * the klass-level ramp. {@code tid} must be the leaking thread's real profiler tid from + * {@link #getTid()} whenever the scenario also relies on leak tagging of real tracked + * instances. */ static native void seedTidTrendSample0(int klassId, int tid, int count, long epoch); /** * Test seam (debug native builds only): wires {@code representative} in as {@code klassId}'s * leak-candidate representative directly (a fresh weak global ref owned by LivenessTracker), - * bypassing the real allocation-sampling path that would otherwise populate this. Combined - * with {@link #seedKlassPopulationSample0} and {@link #tagAsReferenceChainRoot0}, lets a test - * join a synthetic slope signal to a real, directly-tagged object so - * {@link #pollReferenceChainTargets0()}'s bridging step can be exercised end-to-end with - * neither the real sampler nor the real root-seeded walk involved. + * bypassing the real allocation-sampling path. Lets a test join a synthetic slope signal to + * a real, directly-tagged object so {@link #pollReferenceChainTargets0()}'s bridging step can + * be exercised end-to-end. */ static native void setKlassPopulationRepresentativeForTest0(int klassId, Object representative); @@ -604,12 +594,10 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l static native void resetKlassPopulationForTest0(); /** - * Test seam (debug native builds only): returns the klass ids LivenessTracker's - * real leak-candidate ranking (positive population slope, top 5) currently - * selects - the same call ReferenceChainTracker's restart gate and target-polling - * bridge use in production, exposed here so a test can assert a slope signal was - * generated (real or seeded via {@link #seedKlassPopulationSample0}) without - * needing a reference-chain search to also be running. + * Test seam (debug native builds only): returns the klass ids LivenessTracker's real + * leak-candidate ranking (positive population slope, top 5) currently selects - the same + * call the restart gate and target-polling bridge use in production, exposed so a test can + * assert a slope signal was generated without a reference-chain search also running. */ static native int[] selectLeakCandidateKlassIds0(); diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java b/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java index 419c064432..b24394ef0e 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java @@ -38,24 +38,26 @@ * holds samples rooted at each of the three thread entry points; see {@code EntryFrameTest} *

    • leak-cache "<start command>|||<scratch dump path>" - starts the profiler with * the given start command, then runs {@link LeakingCacheScenario} in this process and exits - * directly (no readiness/stdin-signal handshake, unlike the other modes above) once it - * prints its one result line. Used by {@code ExternalProcessReferenceChainTest} - * (referencechains package) to prove the reference-chains mechanism end-to-end against a - * genuinely separate JVM, not the in-process dynamic-attach lifecycle every other test in - * this module uses - see that scenario's own class comment for why a *separate* process is - * load-bearing here (the one-shot root-seeded BFS walk is a process-wide, once-ever - * resource).
      • + * directly once it prints its one result line (no readiness/stdin-signal handshake, unlike + * the modes above). Used by {@code ExternalProcessReferenceChainTest} to prove the + * reference-chains mechanism against a genuinely separate JVM - a separate process is + * load-bearing there because the one-shot root-seeded BFS walk is a process-wide, + * once-ever resource. *
    • leak-static-field "<start command>|||<scratch dump path>" - same packing and - * lifecycle as {@code leak-cache} above, but runs {@link StaticFieldGrowingCollectionScenario} - * instead: a {@code static final List} field appended to (never reassigned) after - * its owning class has already been swept once by {@code admitStaticFieldRoots()} - - * mirroring the real leak generator found in the {@code prof-analyzer-hotdog-jb} pod.
      • + * lifecycle as {@code leak-cache} above, but runs {@link StaticFieldGrowingCollectionScenario}: + * a {@code static final List} field appended to (never reassigned) after its owning + * class has already been swept once by {@code admitStaticFieldRoots()} - mirroring the real + * leak generator found in the {@code prof-analyzer-hotdog-jb} pod. *
    • leak-correlation "<start command>|||<scratch dump path>" - same packing and - * lifecycle as {@code leak-cache} above, but runs {@link LeakTagCorrelationScenario} - * instead: a static-collection leak coexisting with ephemeral stack-local noise of another - * class and a large live filler graph, asserting the emitted chain's targetTag is a - * leak-tag-pool tag matching a HeapLiveObject's leakTag - the chain-to-live-heap-sample - * correlation use case.
      • + * lifecycle as {@code leak-cache} above, but runs {@link LeakTagCorrelationScenario}: a + * static-collection leak coexisting with ephemeral stack-local noise and a large live filler + * graph, asserting the emitted chain's targetTag is a leak-tag-pool tag matching a + * HeapLiveObject's leakTag. + *
    • threadlocal-leak / threadlocal-leak-late "<start command>|||<scratch dump path>" - + * same packing and lifecycle as {@code leak-cache} above, but runs + * {@link ThreadLocalLeakScenario}: a growing {@code byte[]} collection held only through the + * leaking thread's {@code ThreadLocal} map; the {@code -late} variant starts the leak thread + * only after the recording began (see that scenario's own comment).
      • * */ public class ExternalLauncher { @@ -243,9 +245,8 @@ public static void main(String[] args) throws Exception { } } else if (args[0].equals("leak-cache")) { // "|||" packed into one args[1] string rather - // than extending AbstractProcessProfilerTest.launch()'s generic 2-arg - // (target, commands) contract with a 3rd argument every other mode would have to - // ignore. + // than extending launch()'s generic (target, commands) contract with a 3rd + // argument every other mode would have to ignore. String packed = args.length == 2 ? args[1] : ""; int sep = packed.indexOf("|||"); if (sep < 0) { @@ -255,15 +256,13 @@ public static void main(String[] args) throws Exception { String commands = packed.substring(0, sep); String scratchPath = packed.substring(sep + "|||".length()); JavaProfiler instance = JavaProfiler.getInstance(); - // LeakingCacheScenario.run() itself calls instance.execute(commands), not here - - // it needs to seed its cache fixture *before* starting the profiler (see that - // method's own comment for why). + // The scenario itself calls execute(commands) - it needs to seed its cache fixture + // *before* starting the profiler. LeakingCacheScenario.run(instance, commands, Paths.get(scratchPath)); System.out.flush(); - // Deliberately exits here rather than falling through to the shared - // "[ready]" + stdin-signal handshake below: this mode runs to completion in one - // shot (no live back-and-forth with the parent needed) and its own result line - // has already been printed by LeakingCacheScenario.run(). + // Exits here rather than falling through to the shared "[ready]" + stdin-signal + // handshake: this mode runs to completion in one shot and has already printed its + // result line. System.exit(0); } else if (args[0].equals("leak-static-field")) { // Same "|||" packing as leak-cache above. @@ -308,10 +307,9 @@ public static void main(String[] args) throws Exception { System.out.flush(); System.exit(0); } else if (args[0].equals("threadlocal-leak-late")) { - // Same packing as threadlocal-leak, but the leak thread is - // started only AFTER the recording began - the regression - // shape for Profiler::onThreadStart's registerThreadObject() - // wiring (ThreadLocalLeakScenario.run()'s lateThread comment). + // Same packing as threadlocal-leak, but the leak thread is started only AFTER the + // recording began - the regression shape for Profiler::onThreadStart's + // registerThreadObject() wiring (ThreadLocalLeakScenario.run()'s lateThread comment). String packed = args.length == 2 ? args[1] : ""; int sep = packed.indexOf("|||"); if (sep < 0) { diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java b/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java index e2b297a2a3..1fafa3917e 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java @@ -8,10 +8,8 @@ /** * Test bridge for {@link JavaProfiler}'s package-private reference-chain / liveness test seams * (same pattern as {@link ProfilerOwnedBlockHooks}). The seams mutate the process-wide profiler - * singleton's state, so they stay non-public in the shipped library; this class lives only in - * test sources and lets tests in other packages (e.g. {@code referencechains}) reach them. - * Every method is a plain delegate - see the corresponding {@link JavaProfiler} seam for its - * contract (all are debug-native-build only and no-ops in release builds). + * singleton's state, so they stay non-public in the shipped library; tests in other packages + * reach them only through this class. All are debug-native-build only, no-ops in release builds. */ public final class ReferenceChainTestHooks { private ReferenceChainTestHooks() {} diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java index cb91ad34f8..19a31b7e36 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java @@ -25,27 +25,22 @@ * Genuinely separate-process end-to-end coverage for the reference-chains target-selection * mechanism, complementing {@link ReferenceChainTrackingTest}'s in-process coverage: runs a real * "leaking Java app" (an ever-growing, never-evicted {@code HashMap}-backed cache - see - * {@link LeakingCacheScenario}) in a genuinely separate child JVM, launched the same way - * {@code JavaProfilerTest}/{@code JVMAccessTest} already launch child processes, and asserts on - * that child's own reported result rather than reading a JFR file back out of this test's own - * process. + * {@link LeakingCacheScenario}) in a separate child JVM, launched the same way + * {@code JavaProfilerTest}/{@code JVMAccessTest} launch child processes, and asserts on the + * child's own reported result. * *

      Why a separate process, not another {@code @Test} in {@code ReferenceChainTrackingTest}: - * an earlier attempt added a second success-path {@code @Test} method there, using this exact - * same {@code HashMap}-based leak shape, sharing that class's in-process {@code AbstractProfilerTest} - * dynamic-attach lifecycle. It failed reliably whenever it ran after - * {@code ReferenceChainTrackingTest}'s own {@code ChainLink} test in the same JVM - not a - * test-ordering bug, but a genuine, non-obvious property of {@code ReferenceChainTracker}: - * {@code runPass()} (referenceChains.cpp) performs exactly one root-seeded {@code FollowReferences} - * walk per search's *entire lifetime* ({@code _search_started}); every later pass only expands - * frontier entries that walk already discovered ({@code expandFrontier()}) - it never - * re-examines GC roots or revisits an already-{@code EXPANDED} entry for newly-added children. - * Since {@code ReferenceChainTracker} is a process-wide singleton, only the *first* test to ever - * call {@code runPass()} in a given JVM gets a real root-seeded walk; every subsequent test's own, - * independently-rooted local variables are structurally invisible to the mechanism afterward, no - * matter how they are built. A genuinely separate child JVM per scenario sidesteps this - * entirely: each process gets its own fresh {@code ReferenceChainTracker} singleton, and - * therefore its own guaranteed first-ever root walk. + * an earlier attempt did exactly that and failed reliably whenever it ran after that class's own + * {@code ChainLink} test - not a test-ordering bug, but a genuine property of + * {@code ReferenceChainTracker}: {@code runPass()} performs exactly one root-seeded + * {@code FollowReferences} walk per search's *entire lifetime* ({@code _search_started}); every + * later pass only expands frontier entries that walk already discovered ({@code expandFrontier()}) + * - it never re-examines GC roots or revisits an already-{@code EXPANDED} entry for newly-added + * children. Since the tracker is a process-wide singleton, only the *first* test to ever call + * {@code runPass()} in a given JVM gets a real root-seeded walk; every subsequent test's own, + * independently-rooted local variables are structurally invisible afterward. A separate child JVM + * per scenario sidesteps this: each process gets its own fresh singleton, and therefore its own + * guaranteed first-ever root walk. */ @Tag("slow") public class ExternalProcessReferenceChainTest extends AbstractProcessProfilerTest { @@ -68,21 +63,17 @@ void shouldReconstructReferrerChainInSeparateProcess() throws Exception { // LeakingCacheScenario.run() makes to scratchDumpPath matter. Path continuousJfrPath = Files.createTempFile("referencechains-external-process-continuous", ".jfr"); try { - // budget=200000 (up from the in-process test's 4000, found via TEST_LOG instrumentation - // in referenceChains.cpp/livenessTracker.cpp): a genuinely fresh external JVM's - // reachable-from-roots graph (full JUnit/JMC/Gradle-worker classpath, bootstrapped from - // scratch - no benefit from a warm, already-running shared worker JVM) is far larger than - // the in-process test's, and each pass's own JVMTI walk cost scales with cumulative - // frontier size, not with this scenario's own allocation rate - budget=4000 stayed - // truncated=1 at 76000+ admitted edges after 19 real passes and never got close to this - // scenario's own cache before the test's own timeout. _budget is the pacing controller's - // hard ceiling (see updatePacing()'s own comment, referenceChains.cpp) - pausetarget alone - // cannot compensate for a ceiling set too low, only pacing *within* it. - // memory=64:l:1.0 - the explicit 100% live-sample ratio removes the - // default 10% subsampling lottery from the tracked-instance pool - // (see LeakTagCorrelationReferenceChainTest's own comment for the - // full analysis); total volume stays capped by the 256KiB interval - // floor, so the tracking table remains tiny. + // budget=200000 (up from the in-process test's 4000, found via TEST_LOG instrumentation): + // a genuinely fresh external JVM's reachable-from-roots graph (full JUnit/JMC/Gradle-worker + // classpath, bootstrapped from scratch) is far larger than the in-process test's, and each + // pass's walk cost scales with cumulative frontier size, not with this scenario's allocation + // rate - budget=4000 stayed truncated=1 at 76000+ admitted edges after 19 real passes and + // never got close to this scenario's own cache before the timeout. _budget is the pacing + // controller's hard ceiling - pausetarget alone cannot compensate for a ceiling set too + // low. memory=64:l:1.0 - the explicit 100% live-sample ratio removes the default 10% + // subsampling lottery from the tracked-instance pool (see + // LeakTagCorrelationReferenceChainTest's comment); total volume stays capped by the 256KiB + // interval floor, so the tracking table remains tiny. String startCommand = "start,memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=200000:ttl=120000:framecap=2000000:pausetarget=60000" + ",jfr,file=" + continuousJfrPath.toAbsolutePath(); @@ -134,14 +125,13 @@ void shouldReconstructReferrerChainInSeparateProcess() throws Exception { /** * Mirrors {@link #shouldReconstructReferrerChainInSeparateProcess()}, but against {@link - * StaticFieldGrowingCollectionScenario} instead of {@link LeakingCacheScenario}: a {@code - * static final List} field appended to (never reassigned) after its owning class has - * already been swept once by {@code admitStaticFieldRoots()} (referenceChains.cpp) - the exact - * shape found in the {@code prof-analyzer-hotdog-jb} pod's real leak generator, as opposed to - * {@code LeakingCacheScenario}'s local-variable (stack-root) cache. Local, fast reproduction of - * whether {@code collectStaleExpandedEntriesForRotation()}'s rotation mechanism actually - * re-expands an already-{@code EXPANDED} static-field-rooted collection to pick up elements - * added after its one-time sweep. + * StaticFieldGrowingCollectionScenario}: a {@code static final List} field appended to + * (never reassigned) after its owning class has already been swept once by {@code + * admitStaticFieldRoots()} - the exact shape found in the {@code prof-analyzer-hotdog-jb} pod's + * real leak generator. Local, fast reproduction of whether {@code + * collectStaleExpandedEntriesForRotation()}'s rotation mechanism actually re-expands an + * already-{@code EXPANDED} static-field-rooted collection to pick up elements added after its + * one-time sweep. */ @Test void shouldReconstructReferrerChainForGrowingStaticFieldCollection() throws Exception { @@ -153,14 +143,9 @@ void shouldReconstructReferrerChainForGrowingStaticFieldCollection() throws Exce Files.deleteIfExists(scratchDumpPath); Path continuousJfrPath = Files.createTempFile("referencechains-static-field-external-process-continuous", ".jfr"); try { - // See ExternalProcessReferenceChainTest.shouldReconstructReferrerChainInSeparateProcess()'s - // own comment for why budget/pausetarget are raised this far above the in-process test's - // defaults for a genuinely fresh, cold external JVM. - // memory=64:l:1.0 - the explicit 100% live-sample ratio removes the - // default 10% subsampling lottery from the tracked-instance pool - // (see LeakTagCorrelationReferenceChainTest's own comment for the - // full analysis); total volume stays capped by the 256KiB interval - // floor, so the tracking table remains tiny. + // See shouldReconstructReferrerChainInSeparateProcess()'s comment for why budget/pausetarget + // are raised this far above the in-process test's defaults for a cold external JVM; the + // memory=64:l:1.0 ratio rationale is in LeakTagCorrelationReferenceChainTest's comment. String startCommand = "start,memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=200000:ttl=120000:framecap=2000000:pausetarget=60000" + ",jfr,file=" + continuousJfrPath.toAbsolutePath(); @@ -191,10 +176,9 @@ void shouldReconstructReferrerChainForGrowingStaticFieldCollection() throws Exce assertNotNull(resultLine.get(), "Child process never printed a recognizable result marker on stdout"); assertEquals( - // "byte[]", not byte[].class.getName()'s "[B": StaticFieldGrowingCollectionScenario - // prints match.chain.get(0).getFullName(), and JMC's IMCType renders array types in - // Java source notation, not JVM signature notation - see - // ReferenceChainAssertions.jmcStyleName()'s own comment for why matching required the + // "byte[]", not byte[].class.getName()'s "[B": the scenario prints + // match.chain.get(0).getFullName(), and JMC's IMCType renders array types in Java source + // notation - see ReferenceChainAssertions.jmcStyleName() for why matching needs the // same distinction. StaticFieldGrowingCollectionScenario.FOUND_MARKER + "byte[]", resultLine.get(), diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java index 84228969e8..72369b0a2d 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java @@ -55,22 +55,20 @@ void shouldCorrelateLeakChainTargetTagWithLiveObjectLeakTag() throws Exception { } /** - * The pod-regime variant of the correlation use case: the same scenario under a - * pod-like tight pass window (pausetarget in single-digit ms, as on the production-like - * pod whose expand window was ~10ms against a 14-41ms GetObjectsWithTags floor at a - * 242k-entry tag map, ev-leaktag-onpod-round4). Full correlation cannot be the pass - * criterion at this window width: the scenario's trend gates were tuned for the loose - * window's crawl/GC interleaving, and under tight windows the leak klass's real-fold - * trend can flip within a single run - the same knife-edge the pod itself lives on - * (chains arrive via the plain crawl path while pool tagging/interception loses the - * race; observed: [correlation-tag-out-of-pool] with zero interceptions). What CAN be - * asserted deterministically here is the machinery this window exists to exercise: - * the leak-accumulation rotation must engage and select FRONTIER-state (un-expanded - * backlog) holders - the round-4 fix whose absence made that tier select zero on the - * pod while holding 51k known parent candidates. GetObjectsWithTags batch control is - * covered unit-level (gotwWindowNs() widening): a real child JVM's local tag map - * (~100k filler) keeps the per-call floor under the nominal window, so the widening - * regime cannot be reproduced end-to-end locally without a 242k-entry tag map. + * The pod-regime variant: the same scenario under a pod-like tight pass window (pausetarget in + * single-digit ms, as on the production-like pod whose expand window was ~10ms against a + * 14-41ms GetObjectsWithTags floor at a 242k-entry tag map, ev-leaktag-onpod-round4). Full + * correlation cannot be the pass criterion at this window width: the trend gates were tuned + * for the loose window's crawl/GC interleaving, and under tight windows the leak klass's + * real-fold trend can flip within a single run - the same knife-edge the pod itself lives on + * (chains arrive via the plain crawl path while pool tagging/interception loses the race; + * observed: [correlation-tag-out-of-pool] with zero interceptions). What CAN be asserted + * deterministically is the machinery this window exists to exercise: the leak-accumulation + * rotation must engage and select FRONTIER-state (un-expanded backlog) holders - the round-4 + * fix whose absence made that tier select zero on the pod while holding 51k known parent + * candidates. GetObjectsWithTags batch control is covered unit-level (gotwWindowNs() + * widening): a real child JVM's ~100k-entry tag map keeps the per-call floor under the nominal + * window, so the widening regime cannot be reproduced end-to-end locally. */ @Test void shouldRotateFrontierLeakHoldersUnderPodLikeTightWindows() throws Exception { @@ -88,14 +86,12 @@ private void assertCorrelationFound(String pauseTargetOption) throws Exception { /** * Drives the leak-correlation child JVM and asserts the correlated chain, with the - * referencechains pausetarget given by {@code pauseTargetOption} (everything else held - * fixed across the two callers so the variant differs in exactly the pass-window regime). - * With {@code requireFrontierRotation} (the tight-window pod-regime variant), the - * leak-accumulation rotation's FRONTIER-state selection is additionally asserted, and - * the correlation result markers that the pod regime legitimately produces without the - * full correlation completing (not-found, tag-out-of-pool - see the tight variant's own - * comment) are accepted instead of failed - but only if the child logged at least one - * leak-tag interception/correlation or chain-reconstruction attempt. + * referencechains pausetarget given by {@code pauseTargetOption} (everything else held fixed + * across the two callers so the variant differs in exactly the pass-window regime). With + * {@code requireFrontierRotation} (the tight-window pod-regime variant), FRONTIER-state + * rotation selection is additionally asserted, and the pod regime's legitimate partial + * outcomes (not-found, tag-out-of-pool) are accepted instead of failed - but only if the + * child logged at least one leak-tag interception/correlation or chain-reconstruction attempt. */ private void assertCorrelationFound(String pauseTargetOption, boolean requireFrontierRotation) throws Exception { @@ -118,17 +114,14 @@ private void assertCorrelationFound(String pauseTargetOption, // Same raised budget as ExternalProcessReferenceChainTest's own scenarios: a genuinely // fresh, cold external JVM's reachable graph is far larger than the in-process tests', // and this scenario adds ~100k filler objects on top. The pausetarget varies by caller. - // memory=64:l:1.0 - the explicit liveness-sample ratio is load-bearing, - // not decoration: without a ratio segment, the default is 10% - // (arguments.h's _live_samples_ratio) and LivenessTracker::track() - // drops 90% of tracked instances probabilistically. This scenario's - // leak cohort is only tens of 1MB chunks, so the default makes the - // (klass, tid) population a per-run Bernoulli lottery - observed live - // as the intermittent "tagLeakInstances ZERO" runs where zero chunks - // survived the filter (passing runs' stable "tagged=5" is exactly the - // ~10% tail of ~50 chunks). 1.0 makes the scenario's documented - // assumption ("every allocation is sampled, tracked, and taggable", - // LeakTagCorrelationScenario) actually true. + // memory=64:l:1.0 - the explicit liveness-sample ratio is load-bearing: without it the + // default is 10% and LivenessTracker::track() drops 90% of tracked instances + // probabilistically. This scenario's leak cohort is only tens of 1MB chunks, so the + // default makes the (klass, tid) population a per-run Bernoulli lottery - observed live + // as the intermittent "tagLeakInstances ZERO" runs where zero chunks survived the filter + // (passing runs' stable "tagged=5" is exactly the ~10% tail of ~50 chunks). 1.0 makes the + // scenario's documented assumption ("every allocation is sampled, tracked, and taggable") + // actually true. String startCommand = "start,memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=200000:ttl=120000:framecap=2000000:" + pauseTargetOption @@ -196,12 +189,10 @@ private void assertCorrelationFound(String pauseTargetOption, } if (requireFrontierRotation && (line.equals(LeakTagCorrelationScenario.NOT_FOUND_MARKER) || line.startsWith(LeakTagCorrelationScenario.TAG_OUT_OF_POOL_MARKER))) { - // The pod regime legitimately produces these without full correlation completing - // (see the tight variant's comment); the loose variant still fails on them. The - // escape hatch is NOT a blanket pass: the correlation machinery must have run at - // least once (a leak-tag interception/correlation, or a chain-reconstruction - // attempt), so a fully broken path (tagging never firing, interception always - // dropping, no chain ever reconstructed) still fails here. + // The pod regime legitimately produces these without full correlation completing. The + // escape hatch is NOT a blanket pass: the correlation machinery must have run at least + // once, so a fully broken path (tagging never firing, interception always dropping, no + // chain ever reconstructed) still fails here. assertTrue(correlationActivitySeen.get(), "Tight-window outcome " + line + " accepted by the pod-regime escape hatch, but " + "the child logged no leak-tag interception/correlation and no chain " diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java index f4cc0e89a1..a66fd1ad15 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java @@ -19,66 +19,41 @@ import java.util.Map; /** - * The actual "leaking Java app" body run inside a genuinely separate child JVM by - * {@code ExternalLauncher}'s {@code leak-cache} mode, driven by - * {@code ExternalProcessReferenceChainTest}. Deliberately not a JUnit test itself - no - * {@code AbstractProfilerTest}/dynamic-attach lifecycle, no shared-JVM {@code ReferenceChainTracker} - * singleton with any other test - this class's whole point is to run alone in its own process, so - * the one-shot root-seeded BFS walk (see this class's own comment on why a previous attempt at - * folding this scenario into {@code ReferenceChainTrackingTest} as a second {@code @Test} method - * failed) always belongs to this scenario and only this scenario. + * The actual "leaking Java app" body run inside a separate child JVM by {@code ExternalLauncher}'s + * {@code leak-cache} mode, driven by {@code ExternalProcessReferenceChainTest}. Deliberately not a + * JUnit test itself - no shared-JVM {@code ReferenceChainTracker} singleton with any other test; + * the whole point is to run alone in its own process so the one-shot root-seeded BFS walk always + * belongs to this scenario (see {@code ExternalProcessReferenceChainTest}'s comment for why an + * earlier in-process attempt failed). * - *

      Same realistic-leak shape as {@code ReferenceChainTrackingTest}'s own (now-removed) in-process - * attempt: an ever-growing, never-evicted {@code HashMap}-backed cache, held by a local variable. - * - *

      Why {@code cache} is seeded and populated before the profiler is even started - * (found the hard way, against a real separate-process run): {@code threadLoop()} - * (referenceChains.cpp) calls {@code OS::sleep(_effective_cadence_ns)} - 1 second, initially - - * *before* its very first {@code shouldRunPass()} check, and {@code shouldRunPass()} always - * returns {@code true} on that first-ever check ({@code !_search_started}). So the process's - * one-and-only root-seeded walk fires roughly one second after {@code startThread()}, or earlier - * if woken by a GC-finish signal - a race {@code ReferenceChainTrackingTest}'s own - * {@code shouldReportAbandonedSearchOnTinyFrontierCap()} comment already documents ("that wakeup - * can race the thread's own startup ... and be missed"). An initial in-process attempt at this - * exact scenario created {@code cache} and started allocating only *after* starting the profiler - * (mirroring {@code ReferenceChainTrackingTest}'s {@code gcRootHolder}, which happened to work by - * luck of scheduling in a warm, already-running JVM) - against a genuinely fresh, cold JVM this - * lost the race essentially every time: the one-shot walk caught {@code cache} still empty, - * permanently blocking discovery of everything added to it afterward (a frontier entry once - * marked {@code EXPANDED} is never revisited for new children - see {@code expandFrontier()}'s - * own comment). Seeding {@code cache} with real data *before* {@code profiler.execute()} is even - * called removes the race entirely: no matter how fast the walk fires, {@code cache} is never - * empty when it does. + *

      Why {@code cache} is seeded and populated before the profiler is even started: + * {@code threadLoop()} sleeps one initial cadence *before* its very first {@code shouldRunPass()} + * check, and that first check always returns {@code true} ({@code !_search_started}) - so the + * process's one-and-only root-seeded walk fires roughly one second after {@code startThread()}, or + * earlier if woken by a GC-finish signal (which can race the thread's own startup). An initial + * in-process attempt created {@code cache} only *after* starting the profiler; against a cold JVM + * that lost the race essentially every time - the one-shot walk caught {@code cache} still empty, + * and a frontier entry once marked {@code EXPANDED} is never revisited for new children. Seeding + * before {@code profiler.execute()} removes the race entirely. */ public final class LeakingCacheScenario { private LeakingCacheScenario() {} // Arbitrary, scenario-chosen klass id - this process's own LivenessTracker population table - // treats it as an opaque key (see KlassPopulationEntry's own comment) and this process never - // runs any other reference-chains scenario, so no collision risk with e.g. - // ReferenceChainTrackingTest's/ReferenceChainTestSeamsTest's own klass ids in their own, - // separate JVMs. + // treats it as an opaque key, and this process never runs any other reference-chains scenario. private static final int CACHED_PAYLOAD_TEST_KLASS_ID = 987301; - // See ReferenceChainTrackingTest.SEED_EPOCHS_FOR_HYSTERESIS's own comment for the full - // derivation: LivenessTracker's hysteresis gate (livenessTracker.h's - // KLASS_POPULATION_MIN_FILL_FOR_TREND=10 / LEAK_TREND_HYSTERESIS_BASE=5) only starts - // incrementing consecutive_positive once ring_fill has reached 10, so a batch of exactly 10 - // seedKlassPopulationSample0() calls caps consecutive_positive at 1 - far short of what - // selectLeakCandidates() (livenessTracker.cpp) requires before ReferenceChainTracker:: - // hasLeakSignal() reports a candidate, which is what this scenario's own generations=true - // startCommand needs to authorize the BFS thread's first real pass at all. + // See ReferenceChainTrackingTest.SEED_EPOCHS_FOR_HYSTERESIS for the derivation: 10 + // (KLASS_POPULATION_MIN_FILL_FOR_TREND) + 5 (LEAK_TREND_HYSTERESIS_BASE) - 1 = 14 seed calls + // is the minimum that clears selectLeakCandidates()'s consecutive_positive gate; 15 gives + // margin. generations=true needs that gate cleared to authorize the BFS thread's first pass. private static final int SEED_EPOCHS_FOR_HYSTERESIS = 15; /** - * Durable holder for the cache fixture. The discovered-chain gate suppresses - * chains shallower than the first real holder hop that are rooted at a TRANSIENT - * root (stack/JNI local) - a frame-held "leak" is by definition not a leak, so the - * cache must be retained through a static field (the real singleton-collection - * shape) rather than only {@code run()}'s own local, which is exactly the - * transient-rooted shape the gate suppresses. {@code run()}'s local {@code cache} - * variable below aliases this static; the durable root is what makes the emitted - * chain durable-rooted. + * Durable holder for the cache fixture. The discovered-chain gate suppresses chains shallower + * than the first real holder hop that are rooted at a TRANSIENT root (stack/JNI local) - a + * frame-held "leak" is by definition not a leak - so the cache must be retained through a + * static field; {@code run()}'s local {@code cache} variable below aliases this static. */ private static final Map CACHE = new HashMap<>(); @@ -89,35 +64,29 @@ private LeakingCacheScenario() {} public static final String NOT_FOUND_MARKER = "[chain-not-found]"; /** - * Printed to stdout (with the offending class name appended) if a match was found but its - * chain did not pass through {@code java.util.HashMap}'s own internal storage - see - * {@code ExternalProcessReferenceChainTest} for why this is asserted in the parent process - * rather than here (keeping this scenario's own stdout contract to "found/not-found" and - * leaving richer chain-shape assertions to the JUnit side, the same separation of concerns - * {@code ReferenceChainJfrParserTest} already uses for the lower-level JFR-format proof). + * Printed to stdout (with the offending class name appended) if a match was found but its chain + * did not pass through {@code java.util.HashMap}'s own internal storage - asserted in the + * parent process rather than here, keeping this scenario's stdout contract to "found/not-found". */ public static final String NO_HASHMAP_INTERNALS_MARKER = "[chain-found-no-hashmap-internals] "; /** * Printed to stdout (with an "N/M" re-emitted-dump count appended) if the chain was - * successfully reconstructed but did not re-emit into one or more subsequent, - * independently written JFR dumps - i.e. the "snapshot-and-keep" contract of - * {@code ReferenceChainTracker::drainPendingChainEvents()} (referenceChains.cpp), which - * {@code Profiler::dump()} invokes on every dump without clearing the resolved-chain cache, - * failed to hold across dumps. Asserted by {@code ExternalProcessReferenceChainTest}. + * reconstructed but did not re-emit into one or more subsequent, independently written + * JFR dumps - i.e. the "snapshot-and-keep" contract of {@code drainPendingChainEvents()} failed + * to hold across dumps. Asserted by {@code ExternalProcessReferenceChainTest}. */ public static final String CHAIN_NOT_PERSISTED_MARKER = "[chain-not-persisted] "; /** - * Seeds {@code cache} with an initial batch, *then* starts the profiler (see this class's own - * comment for why that order is load-bearing), then runs the same population-growth loop - * {@code ReferenceChainTrackingTest} pioneered - dumping to {@code scratchDumpPath} after every - * round (and a short grace period beyond the last round) until a {@code datadog.ReferenceChain} - * event whose {@code chain[0]} is {@link CachedPayload} appears - then prints exactly one - * result line to stdout. Called from {@code ExternalLauncher} (a different package - hence - * {@code public}), which owns the generic child-process bootstrap (JVMTI/library init, process - * exit) this scenario deliberately stays agnostic of; starting the profiler itself happens - * here, not in {@code ExternalLauncher}, specifically so {@code cache} can be seeded first. + * Seeds {@code cache} with an initial batch, *then* starts the profiler (order is load-bearing, + * see the class comment), then runs the same population-growth loop + * {@code ReferenceChainTrackingTest} pioneered - dumping after every round (plus a grace period) + * until a {@code datadog.ReferenceChain} event whose {@code chain[0]} is {@link CachedPayload} + * appears - then prints exactly one result line to stdout. Called from {@code ExternalLauncher} + * (a different package - hence {@code public}), which owns the generic child-process bootstrap; + * starting the profiler happens here, not there, specifically so {@code cache} can be seeded + * first. */ public static void run(JavaProfiler profiler, String startCommand, Path scratchDumpPath) throws Exception { Map cache = CACHE; @@ -149,29 +118,20 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD match = findMatch(scratchDumpPath); if (match == null && debugBuild) { - // Same debug-only, seeded-representative short-circuit as ReferenceChainTrackingTest's - // own shouldReconstructReferrerChainThroughUnboundedCacheLeak() (see that method's own - // comment, and SEED_EPOCHS_FOR_HYSTERESIS's own comment above): decouples this scenario's - // assertion from whether the real, probabilistic allocation-sampling-driven slope - // detection happens to notice CachedPayload's own population trend within this scenario's - // fixed round/timeout budget - by clearing hasLeakSignal()'s own hysteresis gate outright, - // which is what actually authorizes the BFS thread's first real pass, rather than assuming - // some earlier pass has already tagged anything. "seed-0" (from seedInitialBatch()) is - // reachable via cache for the scenario's entire lifetime, so it is a safe, always-valid - // representative regardless of which round this fires on. - // Representative BEFORE seeding: setKlassPopulationRepresentativeForTest0 - // resolves the representative's real klass id and aliases the synthetic id - // to it, so the hysteresis seeds below land in the real population entry - // (candidate matching is real-id keyed since the leak-tag pool redesign). + // Same debug-only, seeded-representative short-circuit as ReferenceChainTrackingTest: + // clears hasLeakSignal()'s hysteresis gate outright, decoupling this scenario's assertion + // from whether probabilistic slope detection happens to notice CachedPayload's trend + // within the fixed round/timeout budget. "seed-0" (from seedInitialBatch()) is reachable + // via cache for the scenario's entire lifetime, so it is always a valid representative. + // Representative BEFORE seeding: setting it registers the synthetic->real id alias, so + // the seeds below land in the real population entry (candidate matching is real-id keyed + // since the leak-tag pool redesign). ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( CACHED_PAYLOAD_TEST_KLASS_ID, cache.get("seed-0")); if (!seededTestKlassTrend) { - // Per-(klass, tid) qualification seeds: the qualifying tid is THIS - // thread's - the creator of "seed-0", the always-reachable representative - // the seeded ramp and the match below hang off. (The per-round allocator - // threads are one-shot, so no single one of their tids carries a sustained - // per-tid signal - exactly the one-cohort-per-thread shape the retained- - // count bar / synthetic seeds exist to keep qualifying.) + // The qualifying tid is THIS thread's - the creator of "seed-0". The per-round + // allocator threads are one-shot, so no single one of their tids carries a sustained + // per-tid signal. int leakTid = ReferenceChainTestHooks.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0( @@ -222,13 +182,11 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } // Across-dumps persistence: a resolved chain must re-emit into EVERY subsequent dump the - // sample survives into, not only the one dump that first observed it. Profiler::dump() - // re-snapshots the whole resolved-chain cache without clearing it on every call - // (drainPendingChainEvents(), referenceChains.cpp - "snapshot-and-keep, not a drain"), so a - // still-live sample's chain re-emits into every chunk. `cache` still holds every - // CachedPayload here, so the sample stays live across these extra dumps; each dump targets a - // brand-new file, so a chain found there can only be present because it was re-emitted into - // that dump, not left over from the round-loop's own scratchDumpPath. + // sample survives into, not only the dump that first observed it. Profiler::dump() + // re-snapshots the resolved-chain cache without clearing it on every call + // ("snapshot-and-keep, not a drain"). `cache` still holds every CachedPayload here, so the + // sample stays live across these extra dumps; each dump targets a brand-new file, so a chain + // found there can only be present because it was re-emitted into that dump. int persistChecks = 3; int persisted = 0; for (int i = 1; i <= persistChecks; i++) { @@ -256,10 +214,8 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD /** * Populates {@code cache} with {@code count} entries under a key namespace ("seed-") disjoint - * from the round loop's own ("leak-") - called before the profiler (and therefore - * {@code ReferenceChainTracker}'s BFS thread) even starts, so the process's one-shot - * root-seeded walk can never catch {@code cache} empty (see this class's own comment on why - * that race is otherwise real). + * from the round loop's own ("leak-") - before the profiler (and its BFS thread) even starts, + * so the one-shot root-seeded walk can never catch {@code cache} empty. */ private static void seedInitialBatch(Map cache, int count) { for (int i = 0; i < count; i++) { @@ -338,12 +294,11 @@ private static ReferenceChainAssertions.ChainMatch findMatch(Path scratchDumpPat } /** - * Realistic-leak fixture - identical shape to {@code ReferenceChainTrackingTest}'s own - * (now-removed) in-process attempt. The 32 {@code long} fields exist purely so a given number - * of megabytes needs far fewer entries to reach {@code ObjectSampler}'s real 256KiB sampling - * floor - deliberately plain fields, not a nested array (a same-instance companion array would - * be a *second*, separate heap allocation the size-weighted allocation sampler would compete - * for, taking sampling attention away from {@code CachedPayload} itself). + * Realistic-leak fixture - identical shape to {@code ReferenceChainTrackingTest.CachedPayload}. + * The 32 {@code long} fields exist purely so a given number of megabytes needs far fewer entries + * to reach {@code ObjectSampler}'s real 256KiB sampling floor - deliberately plain fields, not + * a nested array (a same-instance companion array would be a second, separate heap allocation + * the size-weighted sampler would compete for, taking attention away from CachedPayload). */ static final class CachedPayload { final String key; diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java index 447a35cfbf..f411ba6901 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java @@ -22,17 +22,12 @@ /** * Shared {@code datadog.ReferenceChain} JFR-parsing helpers, extracted out of - * {@code ReferenceChainTrackingTest} so both that in-process JUnit test and - * {@link LeakingCacheScenario} (run inside a genuinely separate child JVM by - * {@code ExternalProcessReferenceChainTest}) can reuse the exact same JMC-accessor logic - * rather than maintaining two copies. - * - *

      {@link #findMatchForClass(JfrEvents, Class)} is a separate, jafar-backed counterpart to - * {@link #findMatchForClass(IItemCollection, Class)} for {@code ReferenceChainTrackingTest}, which - * loads recordings via {@code AbstractProfilerTest}'s {@code JfrEvents}-returning helpers. - * {@link LeakingCacheScenario} and {@code ReferenceChainJfrParserTest} - * load recordings directly via JMC's {@code JfrLoaderToolkit} and keep using the - * {@code IItemCollection} overload unchanged. + * {@code ReferenceChainTrackingTest} so that test and {@link LeakingCacheScenario} (run inside a + * genuinely separate child JVM by {@code ExternalProcessReferenceChainTest}) reuse the exact same + * JMC-accessor logic rather than maintaining two copies. The jafar-backed + * {@link #findMatchForClass(JfrEvents, Class)} overload serves in-process tests loading recordings + * via {@code AbstractProfilerTest}'s helpers; the JMC {@code IItemCollection} overload serves + * tests loading recordings directly via {@code JfrLoaderToolkit}. */ public final class ReferenceChainAssertions { private ReferenceChainAssertions() {} @@ -137,15 +132,11 @@ public static JfrChainMatch findMatchForClass(JfrEvents events, Class targetC } /** - * {@code targetClass}'s name in the same format {@code IMCType.getFullName()} uses for array - * types - found the hard way: {@code Class.getName()} renders {@code byte[].class} as {@code - * "[B"} (JVM internal signature notation), but JMC's chunk parser renders the same array class's - * {@code IMCType.getFullName()} as {@code "byte[]"} (Java source notation), so comparing {@link - * Class#getName()} directly against {@code getFullName()} - as both {@code findMatchForClass} - * overloads above used to - can never match an array-typed leaf class, even when the correct - * event is genuinely present in the recording. Only affects array {@code targetClass} values - * (e.g. {@code byte[].class}); a non-array class's {@code getName()} already matches {@code - * getFullName()} as-is. + * {@code targetClass}'s name in the format {@code IMCType.getFullName()} uses for array types: + * {@code Class.getName()} renders {@code byte[].class} as {@code "[B"} (JVM internal signature + * notation) but JMC's chunk parser renders the same class as {@code "byte[]"} (Java source + * notation), so comparing {@link Class#getName()} directly against {@code getFullName()} can + * never match an array-typed leaf class. Only affects array {@code targetClass} values. */ private static String jmcStyleName(Class targetClass) { int dimensions = 0; @@ -188,12 +179,9 @@ private static String classFullName(Object element) { /** * Looks up a field's accessor by identifier rather than via {@code Attribute.attr(...)}: JMC's - * v1 chunk parser (internal.parser.v1.ValueReaders.ArrayReader#getContentType()) registers - * {@code UnitLookup.UNKNOWN} as the declared content type for every array field regardless of - * what its element reader resolves to, so an {@code F_ARRAY} field like {@code chain} - * (T_CLASS, F_CPOOL|F_ARRAY, jfrMetadata.cpp) cannot be bound via a compile-time-typed - * {@code Attribute}. Mirrors {@code ReferenceChainJfrParserTest}'s identical lookup, which - * already proves this resolves {@code chain}'s array elements to real {@link IMCType}s. + * v1 chunk parser registers {@code UnitLookup.UNKNOWN} as the declared content type for every + * array field regardless of what its element reader resolves to, so an {@code F_ARRAY} field + * like {@code chain} cannot be bound via a compile-time-typed {@code Attribute}. */ public static IMemberAccessor findAccessor(IType type, String identifier) { for (IAccessorKey key : type.getAccessorKeys().keySet()) { diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java index 552b8c642a..64e1c5604c 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java @@ -14,64 +14,47 @@ import static org.junit.jupiter.api.Assumptions.assumeTrue; /** - * PROF-15341 follow-up: {@code ReferenceChainTrackingTest} exercises {@code LivenessTracker}'s - * probabilistic allocation-sampling-driven slope detection and {@code ReferenceChainTracker}'s - * root-seeded BFS discovery together, in one real-JVM run - reliable only when both mechanisms - * happen to line up within the same bounded retry window. This class decouples them via the - * debug-build-only test seams on {@code JavaProfiler}, reached via + * PROF-15341 follow-up: {@code ReferenceChainTrackingTest} drives slope detection and chain + * reconstruction together and only passes when both happen to line up. This class decouples + * them via the debug-build-only test seams on {@code JavaProfiler}, reached via * {@link ReferenceChainTestHooks} (backed by {@code LivenessTracker}'s existing - * {@code *ForTest} seams and a new {@code ReferenceChainTracker::tagAsRootForTest()}, see - * javaApi.cpp), so each mechanism can be verified end-to-end in isolation: + * {@code *ForTest} seams and {@code ReferenceChainTracker::tagAsRootForTest()}, see javaApi.cpp): *

        - *
      • {@link #shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope()} - asserts a slope signal - * would fire from directly-seeded population history, with no allocation sampling involved.
        • - *
      • {@link #shouldReconstructChainForDirectlyTaggedRoot()} - asserts the BFS/chain- - * reconstruction/event-emission path fires for a directly-tagged, known live object, with no - * dependency on {@code selectLeakCandidates()} organically picking the right klass.
        • + *
      • {@link #shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope()} - slope signal from + * directly-seeded population history, no allocation sampling involved.
        • + *
      • {@link #shouldReconstructChainForDirectlyTaggedRoot()} - BFS/chain-reconstruction/ + * event-emission for a directly-tagged, known live object, without depending on + * {@code selectLeakCandidates()} organically picking the right klass.
        • *
      * *

      Only runs under the debug native build ({@code testdebug}) - the backing native methods do - * not exist in a release build (see javaApi.cpp's {@code #ifdef DEBUG} guard), mirroring - * {@code JVMAccessTest}'s own {@code "debug".equals(System.getProperty("ddprof_test.config"))} - * pattern for the same reason. + * not exist in a release build (see javaApi.cpp's {@code #ifdef DEBUG} guard), same pattern as + * {@code JVMAccessTest}. */ public class ReferenceChainTestSeamsTest extends AbstractProfilerTest { - // Arbitrary, test-chosen klass ids - opaque keys for the population table, EXCEPT - // where a representative is involved: setKlassPopulationRepresentativeForTest() now - // aliases the representative's REAL class id onto the seeded synthetic id (the - // leak-tag redesign keys every consumer by real ids), so shouldReconstructChainForDirectlyTaggedRoot() - // must target a class whose real population entry does not already exist - a unique - // nested class, not java.lang.Object - otherwise the real entry's genuine (noisy) - // history outranks the seeded ramp and the target never becomes a candidate. + // Arbitrary, test-chosen klass ids. setKlassPopulationRepresentativeForTest() aliases the + // representative's REAL class id onto the seeded synthetic id, so the chain test must target + // a class whose real population entry does not already exist - otherwise the real entry's + // genuine history outranks the seeded ramp. private static final int SLOPE_TEST_KLASS_ID = 987001; private static final int CHAIN_TEST_KLASS_ID = 987002; - /** Unique class for {@link #shouldReconstructChainForDirectlyTaggedRoot()}'s target. */ private static final class ChainTarget {} - /** - * Durable root for {@link #shouldReconstructChainForDirectlyTaggedRoot()}'s target: the - * noise gate (suppressChainEvent) intentionally drops depth<2 chains whose root is - * transient (stack local / JNI local) - a method-local target is transient BY DESIGN, so - * holding it statically (the canonical leak shape: static field) is required for the - * chain event to be emitted at all. Shared-JVM hygiene: nulled in a finally below so the - * next test in this no-forkEvery JVM does not inherit the reference. - */ + // The target must be reachable ONLY through this static holder (nulled in a finally so the + // next test in this no-forkEvery JVM does not inherit the reference). Binding it to a live + // local would make it a STACK_LOCAL root for the whole test body, and the noise gate + // (suppressChainEvent) drops depth<2 chains rooted in a transient stack slot - holding it + // statically (the canonical leak shape) is required for the chain event to be emitted at all. private static Object chainTargetHolder; @Override protected String getProfilerCommand() { - // generations=true: gates LivenessTracker's population tracking (gcGenerationsEnabled()) - - // required for selectLeakCandidates() to return anything at all, real or seeded. - // referencechains=true: constructs ReferenceChainTracker's FrontierTable so - // tagAsReferenceChainRoot0()/runReferenceChainPass0() have a table to insert into. - // framecap=2000000 (not 1024): shouldReconstructChainForDirectlyTaggedRoot()'s first pass - // runs IterateOverReachableObjects, which admits every GC root in the whole JVM - not just - // this test's directly-tagged target - into the same frontier. A small framecap fills with - // that ambient root count before the tagged root ever gets to expandFrontier(), hitting - // SearchAbandonReason::FRONTIER_CAP with no chain event queued. Same value/rationale as - // ReferenceChainTrackingTest's own success-path tests (see that class's header comment). + // framecap=2000000 (not 1024): the first BFS pass runs IterateOverReachableObjects, which + // admits every GC root in the whole JVM into the frontier; a small framecap fills with that + // ambient count before the tagged root gets to expandFrontier(), hitting FRONTIER_CAP with + // no chain event queued. Same value as ReferenceChainTrackingTest's success-path tests. return "generations=true,referencechains=true:hops=32:budget=500:ttl=60000:framecap=2000000"; } @@ -84,31 +67,21 @@ private static void assumeDebugBuild() { assumeTrue("debug".equals(System.getProperty("ddprof_test.config"))); } - /** - * Seeds twenty epochs of strictly increasing population counts for {@link #SLOPE_TEST_KLASS_ID} - * directly into LivenessTracker's ring buffer - bypassing real allocation sampling entirely - - * then asserts {@code selectLeakCandidates()} ranks it as a leak candidate. This is the "assert - * a slope signal would be generated" seam: it proves the ranking logic itself works without - * depending on the real JVMTI heap sampler ever surfacing this specific klass. - */ + /** Seeds twenty epochs of strictly increasing population counts, then asserts + * {@code selectLeakCandidates()} ranks the klass as a leak candidate - proving the ranking + * logic works without the real JVMTI heap sampler ever surfacing this klass. */ @Test public void shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope() { assumeDebugBuild(); ReferenceChainTestHooks.resetKlassPopulationForTest0(); ReferenceChainTestHooks.setGcGenerationsEnabled0(true); - // KLASS_POPULATION_MIN_FILL_FOR_TREND = 10 (livenessTracker.h) is only the floor at which a - // trend becomes eligible at all - selectLeakCandidates() also requires consecutive_positive - // to reach LEAK_TREND_HYSTERESIS_BASE = 5 consecutive qualifying epochs before trusting it - // (the sustained-trend hysteresis gate), so at least 10 + (5 - 1) = 14 strictly increasing - // samples are needed; 20 gives headroom. + // selectLeakCandidates() requires consecutive_positive to reach LEAK_TREND_HYSTERESIS_BASE + // = 5 epochs on top of KLASS_POPULATION_MIN_FILL_FOR_TREND = 10, so at least 14 strictly + // increasing samples are needed; 20 gives headroom. for (int epoch = 1; epoch <= 20; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0(SLOPE_TEST_KLASS_ID, epoch * 10, epoch); - // Per-(klass, tid) qualification: selectLeakCandidates() now requires a - // qualifying allocating thread on top of the klass-level ramp. This test - // only asserts the klass makes it into the candidate list - it has no - // tracked instances whose tid a tagging scope would need to match - so a - // fixed synthetic tid suffices here. + // Fixed synthetic tid suffices: this test only asserts the klass-level candidate list. ReferenceChainTestHooks.seedTidTrendSample0(SLOPE_TEST_KLASS_ID, 4242, epoch * 3, epoch); } @@ -124,43 +97,25 @@ public void shouldSelectSeededKlassAsLeakCandidateOnPositiveSlope() { + " to be selected as a leak candidate after a seeded positive-slope population history"); } - /** - * Tags a real, live, caller-chosen object directly as a reference-chain frontier root - * (bypassing ReferenceChainTracker's normal root-seeded discovery walk), wires it in as a - * seeded leak candidate's representative, then drives one BFS pass and one poll cycle - * synchronously. This is the "trigger the refchain on a known live heap sample" seam: it - * proves {@code runPass()}/{@code pollWatchedTargets()}/{@code buildChainEvent()} correctly - * produce a chain event for a target this test controls directly, decoupled from whether - * LivenessTracker's probabilistic sampler would have picked the same object on its own. - */ + /** Tags a live object directly as a frontier root (bypassing the normal root-seeded + * discovery walk), wires it in as a seeded leak candidate's representative, then drives + * pass/poll cycles synchronously - proving {@code runPass()}/{@code pollWatchedTargets()}/ + * {@code buildChainEvent()} produce a chain event for a target this test controls directly. */ @Test public void shouldReconstructChainForDirectlyTaggedRoot() { assumeDebugBuild(); ReferenceChainTestHooks.resetKlassPopulationForTest0(); ReferenceChainTestHooks.setGcGenerationsEnabled0(true); // Guards against inheriting a FrontierTable an earlier test in this same, no-forkEvery - // JVM left permanently full/tiny - e.g. ReferenceChainTrackingTest's own - // shouldReportAbandonedSearchOnTinyFrontierCap deliberately drives the shared table to - // framecap=1 and leaves it that way. Same defensive pattern that class's own tests already - // use (see its header comment); without it, tagAsReferenceChainRoot0()'s insert() below can - // fail against a table this test never sized itself. + // JVM left permanently full/tiny - e.g. ReferenceChainTrackingTest's + // shouldReportAbandonedSearchOnTinyFrontierCap drives the shared table to framecap=1 and + // leaves it that way; without the reset, insert() below can fail. ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); - // The target is referenced ONLY through the static holder - never bound to a - // live local of this frame. A local `target` variable would make the object a - // STACK_LOCAL GC root for the whole test body, and the noise gate (rightly) - // suppresses depth-0 chains rooted in a transient stack slot: the durable - // roots this fixture wants (the static holder, plus the JNI-global-weak-ref - // root LivenessTracker's representative itself creates) then lose the - // durability race only if a stack-local root exists at all. Accessing the - // object only via the static field leaves its frame slots empty between - // calls, so no stack root is ever enumerated. chainTargetHolder = new ChainTarget(); try { - // Representative BEFORE seeding: with the aliasing seam, setting the representative is - // what registers the synthetic->real id alias, so the seeding below lands re-keyed under - // the target's real class id (seeding first still works - the synthetic entry gets - // re-keyed at representative-set time - but rep-first is the documented load-bearing order). + // Representative BEFORE seeding: setting it registers the synthetic->real id alias, so + // the seeding below lands re-keyed under the target's real class id. ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( CHAIN_TEST_KLASS_ID, chainTargetHolder); @@ -168,44 +123,27 @@ public void shouldReconstructChainForDirectlyTaggedRoot() { // (not just KLASS_POPULATION_MIN_FILL_FOR_TREND = 10) is needed to clear the hysteresis gate. for (int epoch = 1; epoch <= 20; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0(CHAIN_TEST_KLASS_ID, epoch * 10, epoch); - // Per-(klass, tid) qualification, seeded with THIS thread's real - // profiler tid: the target was allocated here, so if any path in the - // pass/poll cycle below does hinge on leak tagging of the target as a - // tracked instance, the qualifying tid matches it. (The chain's primary - // path is the directly-tagged frontier root + seeded representative, so - // this is belt-and-braces, not a proven requirement.) + // Belt-and-braces: seed THIS thread's real tid so any path hinging on leak tagging + // of the target as a tracked instance finds a qualifying tid. ReferenceChainTestHooks.seedTidTrendSample0( CHAIN_TEST_KLASS_ID, ReferenceChainTestHooks.getTid(), epoch * 3, epoch); } - // One poll BEFORE the direct tag: the first pollReferenceChainTargets0() - // admits the seeded klass as a watched candidate (canary slot), and the - // seam's discovery recording (tagAsRootForTest's recordDiscoveredInstance) - // only lands when a candidate slot already watches the klass - the - // leak-tag redesign removed the marker-tag path the original pre-poll tag - // used to ride. + // One poll BEFORE the direct tag: the first poll admits the seeded klass as a watched + // candidate, and tagAsRootForTest's recordDiscoveredInstance only lands when a candidate + // slot already watches the klass - the marker-tag path the original pre-poll tag rode is + // gone in the leak-tag redesign. ReferenceChainTestHooks.pollReferenceChainTargets0(); - // The target is referenced ONLY through the static holder - never bound to a - // live local of this frame. A local `target` variable would make the object a - // STACK_LOCAL GC root for the whole test body, and the noise gate (rightly) - // suppresses depth-0 chains rooted in a transient stack slot: the durable - // roots this fixture wants (the static holder, plus the JNI-global-weak-ref - // root LivenessTracker's representative itself creates) then lose the - // durability race only if a stack-local root exists at all. Accessing the - // object only via the static field leaves its frame slots empty between - // calls, so no stack root is ever enumerated. long tag = ReferenceChainTestHooks.tagAsReferenceChainRoot0(chainTargetHolder); assertTrue(tag > 0, "Expected tagAsReferenceChainRoot0 to assign a valid frontier tag"); - // Drive pass+poll cycles until the chain event lands. One pass is NOT enough: - // admitStaticFieldRoots() sweeps loaded classes in chunks (a few hundred per pass, - // bounded by the budget) and the first pass truncates before reaching this test's - // class - the durable (static-field) root discovery that upgrades the target's - // root_kind only happens on the pass whose chunk covers ChainTarget's holder class. - // The bound (40) gives the full sweep lap (~10 passes for ~4000 loaded classes) - // several round trips of headroom; the BFS thread is excluded from racing these - // calls by the engine lock (runPassSerialized/pollWatchedTargetsSerialized). + // One pass is NOT enough: admitStaticFieldRoots() sweeps loaded classes in chunks and + // the first pass truncates before reaching this test's class - the durable static-field + // root discovery that upgrades the target's root_kind only happens on the pass whose + // chunk covers ChainTarget's holder class. 40 gives the full sweep lap (~10 passes for + // ~4000 loaded classes) several round trips of headroom; the engine lock keeps the BFS + // thread from racing these calls. int eventCount = 0; for (int pass = 0; pass < 40 && eventCount == 0; pass++) { boolean sawPassRun = ReferenceChainTestHooks.runReferenceChainPass0(); diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java index 18c47c20a4..b1cbefee7e 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java @@ -94,18 +94,13 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD int initialPasses = debugBuild ? ReferenceChainTestHooks.referenceChainPassesRunForTest0() : -1; if (debugBuild) { - // Seed enough hysteresis-qualifying epochs to unlock ReferenceChainTracker::hasLeakSignal()/ - // shouldRunPass() - WITHOUT wiring in a representative object yet (setKlassPopulationRepresentativeForTest0 - // is not called here). hasLeakSignal() only asks selectLeakCandidates() for a nonzero count - - // it never reads/dereferences the representative field - so this step's only job is - // authorizing the BFS thread's first pass to actually start. Doing this BEFORE waiting on - // passesRun() advancing below is load-bearing, found the hard way: a pass only ever runs - // once shouldRunPass() sees a leak signal - waiting on passesRun() before seeding anything is - // a deadlock, not just a slow path. - // Per-(klass, tid) qualification seeds (see LeakTagCorrelationScenario's own - // seeding block for the rationale): the qualifying tid must be the thread that - // allocates the tracked instances - this thread allocates every LEAK_BUFFER - // chunk, including the lateChunk this scenario watches. + // Seed enough hysteresis-qualifying epochs to unlock hasLeakSignal()/shouldRunPass() - + // WITHOUT wiring in a representative object yet: hasLeakSignal() only asks + // selectLeakCandidates() for a nonzero count, never reads the representative. Doing this + // BEFORE waiting on passesRun() advancing below is load-bearing: a pass only ever runs once + // shouldRunPass() sees a leak signal - waiting before seeding anything is a deadlock. + // Per-(klass, tid) seeds: the qualifying tid must be the thread that allocates the tracked + // instances - this thread allocates every LEAK_BUFFER chunk, including lateChunk. leakTid = ReferenceChainTestHooks.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0( @@ -117,34 +112,23 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } // Wait for the BFS thread to fully complete its own first pass - not just - // admitStaticFieldRoots()'s one-time sweep of LEAK_BUFFER's *current* contents (an earlier, - // narrower version of this wait checked exactly that, via a since-removed - // hasCompletedStaticFieldSweepForTest0() seam), but the WHOLE pass, static-field sweep and - // expandFrontier()/collectStaleExpandedEntriesForRotation() alike - strictly before this - // scenario creates the one chunk whose chain it is actually going to watch for. This is the - // entire point of this scenario: proving that an element appended to a static field's - // collection AFTER that field's List is already ReferenceChainTracker-EXPANDED gets discovered - // via a LATER re-expansion of that stale entry, not via the very first pass that admitted it. - // Waiting on only the static-field sub-step (found the hard way, by actually instrumenting - // runPassManualWalk() and reading cacheResolvedChain()'s own timestamp against it) is not - // enough: admitStaticFieldRoots() and expandFrontier() are two steps of the SAME runPass() - // call, so Java can observe the former's completion while the latter - which is what actually - // marks LEAK_BUFFER's List entry EXPANDED - is still in flight, still racing lateChunk's - // creation exactly the way the sleep-based version this replaced did. Waiting for - // referenceChainPassesRunForTest0() to advance past its pre-seeding snapshot instead only - // becomes true once that ENTIRE pass (both steps) has finished. Non-debug builds have no such - // seam and fall back to a generous sleep - acceptable there because the non-debug path never - // pins a specific representative anyway (see the debugBuild branch below): it just waits on - // real, much-slower allocation sampling to notice the growth on its own, so a few extra - // seconds of margin either way changes nothing about what the eventual match would prove. + // admitStaticFieldRoots()'s one-time sweep of LEAK_BUFFER's current contents, but the WHOLE + // pass, sweep and expandFrontier()/collectStaleExpandedEntriesForRotation() alike - strictly + // before this scenario creates the chunk whose chain it watches for. That is the entire + // point: proving that an element appended AFTER the field's List is already EXPANDED gets + // discovered via a LATER re-expansion of that stale entry, not via the first pass that + // admitted it. Waiting on only the static-field sub-step is not enough: admitStaticFieldRoots() + // and expandFrontier() are two steps of the SAME runPass() call, so Java can observe the + // former's completion while the latter - which actually marks LEAK_BUFFER's entry EXPANDED - + // is still in flight. Advancing referenceChainPassesRunForTest0() past its pre-seeding + // snapshot only becomes true once that ENTIRE pass has finished. Non-debug builds have no + // such seam and fall back to a generous sleep - acceptable there because that path never + // pins a specific representative anyway; it just waits on real allocation sampling. if (debugBuild) { boolean passCompleted = false; // admitStaticFieldRoots() sweeps every loaded class in one FollowReferences call - a cold - // external JVM's full JUnit/JMC/Gradle-worker classpath (thousands of classes) can need - // several retries against pause-time-SLO pacing before one completes without truncating (see - // that method's own header comment on retry-from-scratch-but-cheap-on-already-admitted) - - // generous margin for the same reason ExternalProcessReferenceChainTest's own budget/ - // pausetarget are raised this far above the in-process test's defaults. + // external JVM's full classpath (thousands of classes) can need several retries against + // pause-time-SLO pacing before one completes without truncating. for (int i = 0; i < 300 && !passCompleted; i++) { passCompleted = ReferenceChainTestHooks.referenceChainPassesRunForTest0() != initialPasses; if (!passCompleted) { @@ -168,19 +152,13 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD byte[] lateChunk = new byte[CHUNK_BYTES]; LEAK_BUFFER.add(lateChunk); - // From here on, seeded incrementally, one epoch per round below, rather than as a single - // upfront burst - found the hard way: profiler.execute()'s start() resets - // Profiler::classMap()'s generation synchronously, but LivenessTracker::cleanup_table() only - // observes that new generation (and updates its own _last_class_map_generation) lazily, on the - // BFS thread's own first tick. A burst seeded entirely before that first tick lands in - // _klass_population, then gets wiped wholesale the moment that tick's class-map-generation - // mismatch fires (cleanup_table()'s own comment, livenessTracker.cpp). Seeding one fresh epoch - // per round instead is self-healing exactly the way the real leak this scenario mirrors is: - // LEAK_BUFFER keeps growing every round regardless of any one-time startup housekeeping, so - // however many rounds a wipe costs, the trend simply resumes accumulating from the next - // round's seed call. (Waiting for the first pass to fully complete above already makes this - // particular race very unlikely to matter by this point, but there is no reason to give up the - // self-healing margin now that it costs nothing.) + // From here on, seeded incrementally, one epoch per round, rather than as a single upfront + // burst: profiler.execute()'s start() resets Profiler::classMap()'s generation synchronously, + // but LivenessTracker::cleanup_table() only observes that new generation lazily, on the BFS + // thread's first tick - a burst seeded before that tick gets wiped wholesale by the + // class-map-generation mismatch. Seeding one fresh epoch per round is self-healing the same + // way the real leak is: LEAK_BUFFER keeps growing every round regardless of any one-time + // startup housekeeping, so however many rounds a wipe costs, the trend simply resumes. ReferenceChainAssertions.ChainMatch match = null; int totalRounds = 25; for (int round = 1; round <= totalRounds && match == null; round++) { @@ -191,24 +169,16 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD System.gc(); if (match == null && debugBuild) { - // Seeding/polling every round unconditionally (not gated on passesRun() having advanced) - // is load-bearing, found the hard way: gating this on the tracker's OWN progress creates a - // deadlock - ReferenceChainTracker::hasLeakSignal() (which authorizes both a search's first - // pass and any later restart once the search reaches a terminal state) reads - // LivenessTracker::selectLeakCandidates(), which needs a continuously-refreshed population - // trend to keep reporting this candidate; stopping that refresh mid-search (to wait on the - // search's own progress) can stall the search itself with no path back, since nothing else - // keeps re-authorizing it. This scenario's target - a growing static-field collection - - // legitimately produces a continuous real signal in production; seeding continuously here - // is what actually mirrors that, not an artifact to gate away. + // Seeding/polling every round unconditionally is load-bearing: gating this on the + // tracker's own progress creates a deadlock - hasLeakSignal() (which authorizes both a + // first pass and any restart) reads selectLeakCandidates(), which needs a + // continuously-refreshed trend to keep reporting this candidate; stopping the refresh + // mid-search can stall the search with no path back. This scenario's target - a growing + // static-field collection - legitimately produces a continuous real signal in production; + // seeding continuously is what mirrors that, not an artifact to gate away. // - // Same debug-only seeded-representative short-circuit as LeakingCacheScenario's own - - // watches lateChunk specifically (added after the static field's first sweep), not - // whatever the real allocation sampler happens to pick. See SEED_EPOCHS_FOR_HYSTERESIS's - // own comment for the minimum epoch count this needs - kept uncapped here (not stopped - // once that minimum is reached) specifically so a wipe that costs an early round or two - // still leaves enough remaining rounds to reach it, rather than exhausting a fixed budget - // of calls before ever getting there. + // Kept uncapped (not stopped once the minimum epoch count is reached) so a wipe that + // costs an early round or two still leaves enough remaining rounds to reach it. hysteresisEpoch++; ReferenceChainTestHooks.seedKlassPopulationSample0( LEAK_BUFFER_TEST_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); @@ -218,14 +188,11 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD LEAK_BUFFER_TEST_KLASS_ID, lateChunk); ReferenceChainTestHooks.pollReferenceChainTargets0(); - // Only TRUST a match once passesRun() has genuinely changed since the snapshot taken right - // before lateChunk was created - either advanced (the same, never-restarted search ran a - // later pass) or reset to a lower value (restartSearch() ran, which only ever happens on a - // threadLoop tick strictly after that snapshot, since time only moves forward). Either way - // proves the match came from a walk that started after lateChunk existed, ruling out the - // one race this whole seam exists to rule out: the very first, still-in-flight pass finding - // lateChunk by accident because admitStaticFieldRoots() and expandFrontier() are two steps - // of that SAME call, and Java can observe the former's completion before the latter runs. + // Only TRUST a match once passesRun() has changed since the snapshot taken right before + // lateChunk was created - advanced (the same, never-restarted search ran a later pass) or + // reset lower (restartSearch() ran, only possible on a tick strictly after that + // snapshot). Either way proves the match came from a walk that started after lateChunk + // existed, ruling out the still-in-flight first pass finding it by accident. if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() != passesRunBeforeLateChunk) { profiler.dump(scratchDumpPath); match = findMatch(scratchDumpPath); @@ -243,18 +210,14 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } } - // A cold external JVM's one-shot root-seeded walk over its whole reachable graph (full - // JUnit/JMC/Gradle-worker classpath) takes far longer than this scenario's own round loop - - // found the hard way: a first attempt at this scenario's tail wait (5 x 1s) gave up and - // printed NOT_FOUND_MARKER mere moments before the tracker's own runPass() actually - // completed (searchState=COMPLETED) and successfully built the chain. Mirrors - // ExternalProcessReferenceChainTest's own comment on why budget/pausetarget are raised this - // far for exactly this reason. + // A cold external JVM's one-shot root-seeded walk over its whole reachable graph takes far + // longer than the round loop: an earlier tail wait of 5 x 1s gave up and printed NOT_FOUND + // mere moments before the tracker's own pass actually completed and built the chain. for (int attempt = 0; match == null && attempt < 40; attempt++) { Thread.sleep(1500); // Same passesRun()-advanced check as the round loop above (debug builds only) - by this - // point in a real run it has virtually always already flipped, but there is no reason to - // drop the guarantee here just because the round loop above didn't need it. + // point it has virtually always already flipped, but there is no reason to drop the + // guarantee. if (debugBuild && ReferenceChainTestHooks.referenceChainPassesRunForTest0() == passesRunBeforeLateChunk) { continue; From 3e74447fa39c6a3a90ab2f246c04e1a9390f9417 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Tue, 13 Oct 2026 08:50:22 +0200 Subject: [PATCH 07/17] Address light-review findings on the rc-7 test stack Fixes from the sphinx light review (9 items): - LeakTagCorrelationScenario.keepBest now merges violations in both directions; resultLine extracted and covered by the new LeakTagCorrelationScenarioKeepBestTest (7 tests, no profiler needed) - AggressiveLeakReferenceChainTest: hoist shouldRunPassForTest0() out of assertFalse, reset the search first - build-and-summarize: single write_unknown_summary() writer; Gradle exit status stays authoritative - run-refchains-repro.sh: bash 3.2 set -u guards for empty arrays - ReferenceChainTrackingTest: scratch JFRs via Files.createTempFile - ReferenceChainLeakDemo: seeding in main() before run(); heapUsedFraction falls back to Runtime.maxMemory() - referenceChainJfrRoundtrip fixture is consume-once (unlink before write); ReferenceChainJfrParserTest deletes it after reading - ReferenceChainJfrParserTest: assumeTrue fixture skip, re-applied from 218c2b7cc (rc-7 forked before that fix) The touched Java files also carry the humanize comment rewrites for those files; splitting them would have left comments describing code that the intermediate commit did not contain. --- .claude/commands/build-and-summarize | 49 +- .../cpp/referenceChainJfrRoundtrip_ut.cpp | 15 +- .../repro/ReferenceChainLeakDemo.java | 111 +-- .../AggressiveLeakReferenceChainTest.java | 13 +- .../LeakTagCorrelationScenario.java | 188 ++-- ...eakTagCorrelationScenarioKeepBestTest.java | 142 +++ .../ReferenceChainJfrParserTest.java | 75 +- .../ReferenceChainTrackingTest.java | 933 +++++++----------- ...eepbest-only-merges-the-incoming-scan-s.md | 124 +++ utils/run-refchains-repro.sh | 5 +- 10 files changed, 837 insertions(+), 818 deletions(-) create mode 100644 ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenarioKeepBestTest.java create mode 100644 docs/sphinx/specs/2026-10-12-keepbest-only-merges-the-incoming-scan-s.md diff --git a/.claude/commands/build-and-summarize b/.claude/commands/build-and-summarize index 358803b0e1..5e14c1c9e7 100755 --- a/.claude/commands/build-and-summarize +++ b/.claude/commands/build-and-summarize @@ -45,9 +45,10 @@ tail -n0 -F "$LOG" 2>/dev/null > >(awk ' ') & tail_pid=$! -# Wait for Gradle to finish -wait "$gradle_pid" -status=$? +# Wait for Gradle to finish. set -e would abort right here on a failed build (before any summary +# runs), so capture the status instead of letting errexit see it. +status=0 +wait "$gradle_pid" || status=$? # Stop the tail and print a compact summary from the log kill "$tail_pid" 2>/dev/null || true @@ -77,9 +78,27 @@ fi # to sonnet-5 via the AI gateway, billing real money for every log parse.) echo echo "Generating gradle summary…" +# Single writer for the UNKNOWN artifact pair: every path that cannot produce a real summary +# (unusable log, generator exception, missing python3) goes through here, so the schema lives once. +# Keys/order match the generator's success-path JSON below. +write_unknown_summary() { + local out=build/reports/claude detail detail_json + detail="$1, see $LOG" + detail_json="$(printf '%s' "$detail" | sed -e 's/\\/\\\\/g' -e 's/"/\\"/g')" + mkdir -p "$out" + printf '# Gradle Summary\n\n- Status: UNKNOWN (%s)\n- Log: %s\n' "$1" "$LOG" > "$out/gradle-summary.md" + printf '{"status": "UNKNOWN", "totalTime": null, "failedTasks": [], "primaryFailures": [], "warnings": [], "tests": {"total": 0, "failed": 0, "skipped": 0, "modules": {}}, "slowTasks": [], "depIssues": ["%s"], "actions": []}\n' "$detail_json" > "$out/gradle-summary.json" +} + # A generator failure (exception, missing python3) must not leave stale or missing artifacts -# behind a successful exit: capture its rc, write an UNKNOWN pair below, and propagate the rc. +# behind: capture its rc and write an UNKNOWN pair below. Gradle's own status stays authoritative +# for the exit code. summary_rc=0 +if [ ! -s "$LOG" ]; then + if [ -f "$LOG" ]; then why="log is empty"; else why="log not found"; fi + write_unknown_summary "$why" + echo "Gradle log unusable ($why); wrote build/reports/claude/gradle-summary.{md,json}" +else python3 - "$LOG" <<'PYEOF' || summary_rc=$? import json, os, re, sys @@ -119,16 +138,6 @@ def add_counts(name, ok, failed, skipped): tests["failed"] += failed tests["skipped"] += skipped -if not log_path or not os.path.isfile(log_path) or os.path.getsize(log_path) == 0: - why = f"log not found: {log_path!r}" if not log_path or not os.path.isfile(log_path) else "log is empty" - os.makedirs(OUT_DIR, exist_ok=True) - open(MD, "w").write(f"# Gradle Summary\n\n- Status: UNKNOWN ({why})\n\nFull log unavailable or empty.\n") - json.dump({"status": "UNKNOWN", "totalTime": None, "failedTasks": [], "primaryFailures": [], - "warnings": [], "tests": tests, "slowTasks": [], "depIssues": [why], "actions": []}, - open(JS, "w"), indent=1) - print(f"Gradle log unusable ({why}); wrote {MD} and {JS}") - sys.exit(0) - grab_headline = False with open(log_path, encoding="utf-8", errors="replace") as f: for line in f: @@ -255,14 +264,12 @@ open(MD, "w").write("\n".join(L) + "\n") print(f"{status} (time: {total_time or 'n/a'}); {len(failed)} failing task(s), {tests['failed']} test failure(s)") print(f"Wrote {MD} and {JS}") PYEOF +fi if [ "$summary_rc" -ne 0 ]; then echo "⚠ gradle summary generation failed (rc=$summary_rc) — full log at: $LOG" - mkdir -p build/reports/claude - log_json="$(printf '%s' "$LOG" | sed -e 's/\\/\\\\/g' -e 's/"/\\"/g')" - printf '# Gradle Summary\n\n- Status: UNKNOWN (summary generation failed, rc=%s)\n- Log: %s\n' \ - "$summary_rc" "$LOG" > build/reports/claude/gradle-summary.md - printf '{"status": "UNKNOWN", "totalTime": null, "failedTasks": [], "primaryFailures": [], "warnings": [], "tests": {"total": 0, "failed": 0, "skipped": 0, "modules": {}}, "slowTasks": [], "depIssues": ["summary generation failed (rc=%s), see %s"], "actions": []}\n' \ - "$summary_rc" "$log_json" > build/reports/claude/gradle-summary.json - exit "$summary_rc" + write_unknown_summary "summary generation failed, rc=$summary_rc" + # Gradle's own status is authoritative; the generator rc surfaces only when the build passed. + exit $(( status != 0 ? status : summary_rc )) fi +exit "$status" diff --git a/ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp b/ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp index b69987128f..7af0b2a410 100644 --- a/ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp +++ b/ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp @@ -234,10 +234,13 @@ class ReferenceChainJfrRoundtripTest : public ::testing::Test { }; // Path agreed with the companion Java parser test in ddprof-test, which -// reads the same file back via JMC's JfrLoaderToolkit. The build passes the -// same DDPROF_REFERENCE_CHAIN_ROUNDTRIP_JFR to both sides (ddprof-lib and -// ddprof-test build.gradle.kts) and deletes the file before this gtest runs; -// the OS temp dir is only a fallback for running the binary by hand. +// reads the same file back via JMC's +// JfrLoaderToolkit. Both sides resolve it via the OS temp dir so the +// producer (this gtest) and the consumer (the Java test, run afterwards by +// the same operator/CI job on the same machine) agree without either side +// needing to know the other module's build directory layout. +// The file is consume-once: ProducesValidStandaloneJfrWithChainEvent unlinks it before +// writing and the Java test deletes it after reading. static std::string chainRoundtripJfrPath() { const char *configured = getenv("DDPROF_REFERENCE_CHAIN_ROUNDTRIP_JFR"); if (configured != nullptr && *configured != 0) { @@ -280,6 +283,10 @@ static u32 decodeVar32(const char *data, int *off) { } TEST_F(ReferenceChainJfrRoundtripTest, ProducesValidStandaloneJfrWithChainEvent) { + // Drop any fixture left by an earlier (possibly different-revision) run before any ASSERT + // below can bail out, so a failed run never leaves a stale file for the Java parser test + // (ReferenceChainJfrParserTest) to validate. ENOENT is expected and ignored. + unlink(chainRoundtripJfrPath().c_str()); Arguments args; ASSERT_FALSE(args.parse("referencechains=true:hops=64:budget=1000")); // Skip OS/CPU info, JVM info, system properties and native library diff --git a/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java b/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java index 21eb70b97a..e4a592c688 100644 --- a/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java +++ b/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java @@ -30,75 +30,52 @@ * *

      Takes the JFR output path as {@code args[0]} (must match {@code file=} above) and the * agent's own {@code .so} path as {@code args[1]} (must match the {@code -agentpath} value - * above), and periodically calls {@link JavaProfiler#dump}. Both are load-bearing: + * above), and periodically calls {@link JavaProfiler#dump}. Both are load-bearing: the dump call + * is the only code path that drains {@code ReferenceChainTracker}'s pending chain-event queue + * into the JFR file (nothing drains it on a timer), and passing the {@code .so} path explicitly + * makes {@code getInstance()} attach to the already-loaded {@code -agentpath} agent instead of + * extracting the jar's bundled copy to a temp file - a second, never-{@code start()}-ed + * {@code Profiler} singleton whose {@code dump()} calls would be silent no-ops. Each periodic + * dump goes to its own file, {@code .snapshot.}, because a drained chain + * event is written exactly once: reusing one snapshot path would permanently lose every earlier + * window's chains. A bounded run's final dump goes to {@code .snapshot} (the path + * the sweep scripts read); inspect all snapshot files together for the complete chain evidence. * *

      An optional {@code args[2]} duration in seconds switches from the default "run forever" * manual mode to a bounded session that dumps once more and prints a single {@code [metrics]} * line at exit (throughput, round latency, heap growth) - see * {@code utils/compare-refchains-repro.sh}, which runs this app twice (referencechains on vs. * off) over the same duration and diffs those lines against each run's safepoint/GC logs. - *

        - *
      • The dump call itself: {@code Profiler::dump()} (profiler.cpp) is the only code path - * that drains {@code ReferenceChainTracker}'s pending chain-event queue and actually writes - * {@code datadog.ReferenceChain} into the JFR file - nothing drains that queue on a timer, - * and in production it's dd-trace-java's own periodic recording-chunk rotation that calls - * {@code dump()}. Without it, chain events get built and enqueued (visible via {@code - * TEST_LOG}) but are silently discarded when the process exits. Each periodic dump goes to - * its own file, {@code .snapshot.} (printed as a {@code [repro] - * dumped ...} line), because a drained chain event is written exactly once: reusing one - * snapshot path would overwrite - and permanently lose - every earlier window's chains. - * A bounded run's final dump goes to {@code .snapshot} (the path the sweep - * scripts read); inspect all snapshot files together for the complete chain evidence. - *
      • Passing the {@code .so} path explicitly to {@link JavaProfiler#getInstance(String, - * String)}: with no {@code libLocation}, {@code getInstance()} extracts the jar's own - * bundled copy of the library to a fresh temp file and {@code System.load()}s that - * instead of attaching to the one {@code -agentpath} already loaded - a second, never-{@code - * start()}-ed {@code Profiler} singleton whose {@code dump()} calls are silent no-ops. - * Passing the same path lets the dynamic linker dedup the load onto the already-running - * singleton, the same way dd-trace-java attaches to its own {@code -agentpath} agent. - *
      - * - *

      Deliberately omits {@code firstpassbudget}: the tracker auto-scales its - * first pass's budget from the plain {@code budget} value - * ({@code ReferenceChainTracker::AUTO_FIRST_PASS_BUDGET_MULTIPLIER}, capped at - * {@code AUTO_FIRST_PASS_BUDGET_CAP}, referenceChains.h) rather than reusing - * {@code budget} as-is for that first, cold root-seeded walk - reusing it directly - * truncates every pass before it gets anywhere near this app's {@code CachedEntry} - * population, and the target's JVMTI tag stays 0 forever. Pass - * {@code firstpassbudget=N} explicitly only to override that auto-scaled default. + *

      + *

      Deliberately omits {@code firstpassbudget}: the tracker auto-scales its first pass's budget + * from the plain {@code budget} value ({@code AUTO_FIRST_PASS_BUDGET_MULTIPLIER}, capped at + * {@code AUTO_FIRST_PASS_BUDGET_CAP}, referenceChains.h) rather than reusing {@code budget} as-is + * for that first, cold root-seeded walk - reusing it directly truncates every pass before it gets + * anywhere near this app's {@code CachedEntry} population. Pass {@code firstpassbudget=N} + * explicitly only to override that auto-scaled default. * *

      Grows an ever-referenced, never-evicted {@code HashMap}-backed cache (same shape as - * ddprof-test's {@code LeakingCacheScenario}/the chaos harness's {@code - * ReferenceChainLeakAntagonist}). Two things this app does deliberately, both found the hard - * way by running it without them and never seeing a chain get discovered: + * ddprof-test's {@code LeakingCacheScenario}). Two deliberate choices, both found by running + * without them and never seeing a chain get discovered: * *

        *
      • Explicit {@code System.gc()} every round. {@code LivenessTracker}'s - * population-growth trend ({@code computeKlassPopulationSlope}, livenessTracker.cpp) needs at - * least {@code KLASS_POPULATION_MIN_FILL_FOR_TREND} (10) distinct GC epochs of population - * samples before it will even attempt a slope, and {@code _gc_epoch} only advances on a - * {@code GarbageCollectionFinish} JVMTI callback - i.e. on an actual GC. Left to whatever GCs - * the JVM decides to run on its own, a slow, modest allocation rate against a large default - * heap can go many minutes without a single GC, so the epoch count - and therefore the trend - - * never moves. Forcing a GC every round (same pattern {@code LeakingCacheScenario}'s round - * loop and {@code ReferenceChainTrackingTest} already rely on) turns epoch progress into - * something this app controls directly instead of leaving it to chance. + * population-growth trend needs at least {@code KLASS_POPULATION_MIN_FILL_FOR_TREND} (10) + * distinct GC epochs of samples before it attempts a slope, and {@code _gc_epoch} only advances + * on a {@code GarbageCollectionFinish} callback. A slow allocation rate against a large default + * heap can go many minutes without a GC, so the trend never moves on its own.
        • *
      • No hard stop. A cache that grows to a fixed cap and then sits flat stops being a - * growing population the instant it stops growing - {@code computeKlassPopulationSlope} - * compares the earliest vs. most recent third of its 30-epoch ring, so a long enough flat - * period after the cap pushes the slope back to zero (or the real growth epochs age out of the - * ring before the search ever gets scheduled/its own pain-budget cooldown clears). This app - * keeps growing forever instead, self-throttling its own pace against a heap-usage watermark - * (see {@link #run}) so it stays a real, positive, continuously-observable trend without ever - * growing fast/large enough to actually exhaust the heap. + * growing population the instant it stops growing - {@code computeKlassPopulationSlope} compares + * the earliest vs. most recent third of its 30-epoch ring, so a long enough flat period pushes + * the slope back to zero. This app keeps growing forever, self-throttling against a heap-usage + * watermark (see {@link #run}) so the trend stays real without ever exhausting the heap.
        • *
      * - *

      Seeds the cache with an initial batch on the very first line of {@code main} - before - * printing anything or sleeping - so the agent's one-shot, root-seeded first pass (which fires - * roughly a second after the agent's own background thread starts, i.e. before {@code - * Agent_OnLoad} even returns control to this class's {@code main}) has a real chance of finding - * {@code cache} already non-empty. See {@code LeakingCacheScenario}'s own comment for the full - * story of why that ordering is load-bearing. + *

      Seeds the cache on the very first line of {@code main} - before validating arguments, + * loading/attaching to the agent library, printing anything, or sleeping - so the agent's one-shot, root-seeded first pass (which fires roughly a second after + * the agent's background thread starts, i.e. before {@code Agent_OnLoad} even returns control to + * {@code main}) has a real chance of finding {@code cache} already non-empty. See + * {@code LeakingCacheScenario}'s comment for why that ordering is load-bearing. */ public final class ReferenceChainLeakDemo { @@ -125,12 +102,16 @@ public final class ReferenceChainLeakDemo { + "metrics-reporting session instead of forever)"; public static void main(String[] args) throws Exception { + // Must stay first - see the class header: seeding races the agent's one-shot, + // root-seeded first pass. + Map cache = new HashMap<>(); + seed(cache, 300); if (args.length < 2) { System.err.println(USAGE); System.exit(1); } long durationSeconds = args.length >= 3 ? parseDurationSeconds(args[2]) : -1; - run(Paths.get(args[0]), args[1], durationSeconds); + run(cache, Paths.get(args[0]), args[1], durationSeconds); } // Malformed input (e.g. an empty/garbled $DURATION from the wrapper scripts) must print the @@ -166,7 +147,7 @@ private static long parseDurationSeconds(String arg) { private static long totalRoundNanos = 0; private static long maxRoundNanos = 0; - private static void run(Path recordingPath, String agentSoPath, long durationSeconds) throws InterruptedException { + private static void run(Map cache, Path recordingPath, String agentSoPath, long durationSeconds) throws InterruptedException { // Must differ from recordingPath itself - see SNAPSHOT_SUFFIX's comment. Final // (bounded-run) drain target; periodic drains use snapshotPath + "." + round. Path snapshotPath = recordingPath.resolveSibling(recordingPath.getFileName() + SNAPSHOT_SUFFIX); @@ -185,9 +166,6 @@ private static void run(Path recordingPath, String agentSoPath, long durationSec + "-agentpath:libjavaProfiler.so=start,...?", e); } - Map cache = new HashMap<>(); - seed(cache, 300); - System.out.println("[repro] pid=" + pid() + " - growing cache " + (durationSeconds >= 0 ? ("for " + durationSeconds + "s") : "forever") + ", forcing a GC every round so the profiler's " @@ -292,7 +270,18 @@ private static long heapUsedMb() { private static double heapUsedFraction() { MemoryUsage heap = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); - return heap.getMax() > 0 ? (double) heap.getUsed() / (double) heap.getMax() : 0.0; + long max = heap.getMax(); + if (max <= 0) { + // Heap max undefined (-1) in some container/ergonomics setups: fall back to + // Runtime.maxMemory(), and if that is unbounded too (Long.MAX_VALUE), report the high + // watermark so growth runs throttled - never treat "unknown limit" as "empty heap". + long runtimeMax = Runtime.getRuntime().maxMemory(); + if (runtimeMax <= 0 || runtimeMax == Long.MAX_VALUE) { + return HIGH_WATERMARK; + } + max = runtimeMax; + } + return (double) heap.getUsed() / (double) max; } private static String pct(double fraction) { diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java index b56e986235..0084ad6920 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java @@ -30,7 +30,7 @@ * seed {@code LivenessTracker}'s aggregate heap-floor-ring history and its max-heap-bytes cache * directly, so {@code secondsToOOM()}'s projection can be driven under * {@code OOM_URGENT_THRESHOLD_S} (referenceChains.h) deterministically, decoupled from this JVM's - * real {@code -Xmx} and from real GC timing. {@code shouldRunPassForTest0()} then reads + * real {@code -Xmx} and from real GC timing. {@code shouldRunPassForTest0()} then evaluates * {@code ReferenceChainTracker::shouldRunPass()} - the search-restart gate {@code hasLeakSignal()} * feeds - directly, rather than running a real pass, so this class never depends on * {@code selectLeakCandidates()} ranking anything, a real JVMTI heap walk, or a JFR event. @@ -162,7 +162,16 @@ public void shouldNotOpenSearchGateOnFlatHeapFloorWithNoLeakCandidate() { assertTrue(candidates == null || candidates.length == 0, "This test's own precondition: no per-klass candidate should exist either"); - assertFalse(ReferenceChainTestHooks.shouldRunPassForTest0(), + // shouldRunPassForTest0() is NOT a pure predicate (see JavaProfiler's own javadoc): under the + // native engine lock it may account a finished search's pain, restart terminal search state, + // or spend the urgent one-shot entitlement. Reset the search right before it so any mutation + // lands on a fresh tracker (_search_started == false) instead of whatever search an earlier + // class in this shared JVM left behind. Only the search is reset here, not the population: + // resetKlassPopulationForTest0() also zeroes the heap-floor ring seeded above, which would + // turn this control into a trivial "insufficient fill" pass. + ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); + boolean gateOpen = ReferenceChainTestHooks.shouldRunPassForTest0(); + assertFalse(gateOpen, "Expected the search-restart gate to stay closed: no heap growth and no per-klass " + "candidate give hasLeakSignal() nothing to trust"); } finally { diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java index 92a4e3b0b5..9a7c5ca018 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java @@ -62,17 +62,14 @@ public final class LeakTagCorrelationScenario { private LeakTagCorrelationScenario() {} /** - * The leak: a static collection appended to for the process's whole life - the - * canonical unmaintained-singleton retention shape, DELIBERATELY a growing - * {@code ArrayList} and not a fixed holder. An ArrayList's backing - * {@code elementData} array is REPLACED on growth, and an EXPANDED frontier node's - * children set is frozen at expansion time (expandFrontier()'s own comment), so - * discovering contents added after a resize is exactly the hard production case - * this scenario must prove works: the live holder's re-walk has to admit each new - * backing array, and only then can its new chunks be admitted and leak-tag - * intercepted. (An earlier fixed-array version of this fixture sidestepped that - * requirement and still failed - see the scenario history in the investigation - * notes - which is what exposed the rotation starvation this fixture now encodes.) + * The leak: a static collection appended to for the process's whole life - the canonical + * unmaintained-singleton retention shape, deliberately a GROWING ArrayList: an ArrayList's + * backing {@code elementData} array is REPLACED on growth, and an EXPANDED frontier node's + * children set is frozen at expansion time, so discovering contents added after a resize is + * the hard production case this scenario must prove works - the live holder's re-walk has to + * admit each new backing array, and only then can its new chunks be admitted and leak-tag + * intercepted. (An earlier fixed-array version sidestepped that requirement and still failed, + * which is what exposed the rotation starvation this fixture now encodes.) */ static final List LEAK_SINK = new ArrayList<>(); @@ -94,13 +91,11 @@ private LeakTagCorrelationScenario() {} private static final int SEED_CHUNKS = 10; /** - * Per-round trend-maintenance epoch counter (debug builds only) - same - * pattern and rationale as StaticFieldGrowingCollectionScenario's own: - * a one-shot seeded ramp ages out of LivenessTracker's hysteresis once - * enough real fold samples interleave (observed live: the byte[] candidate - * dropped right after the first leak-tag interceptions, stranding the - * correlated discoveries with no poll loop to build their chains), so - * each round pushes one fresh rising epoch to keep the candidates alive. + * Per-round trend-maintenance epoch counter (debug builds only), same pattern as + * StaticFieldGrowingCollectionScenario: a one-shot seeded ramp ages out of LivenessTracker's + * hysteresis once enough real fold samples interleave (observed live: the byte[] candidate + * dropped right after the first leak-tag interceptions), so each round pushes one fresh rising + * epoch to keep the candidates alive. */ private static int hysteresisEpoch = 0; @@ -116,26 +111,24 @@ private static void addChunk() { private static final long LEAK_TAG_POOL_SIZE = 256; /** - * Transient handoff channel for the noise representative - deliberately a local of - * {@code run()} (captured by the noise thread's lambda), NOT a static field: any static - * field holding a {@link NoisePayload} would make that one instance genuinely, - * durably static-retained, and the profiler would be RIGHT to emit a static-rooted chain - * for it - found the hard way on this scenario's very first run, which correctly reported - * {@code NoisePayload@depth0:static_field}. After the handoff the only JVM-heap reference - * to the representative is the noise thread's live frame, which is exactly the - * transient-rooted retention this class exists to exercise. + * Transient handoff channel for the noise representative - deliberately a local of {@code run()} + * (captured by the noise thread's lambda), NOT a static field: any static field holding a + * {@link NoisePayload} would make that instance genuinely, durably static-retained, and the + * profiler would be RIGHT to emit a static-rooted chain for it - the scenario's very first run + * correctly reported {@code NoisePayload@depth0:static_field}. After the handoff the only + * JVM-heap reference to the representative is the noise thread's live frame, exactly the + * transient-rooted retention this class exercises. */ private static final class NoiseHandoff { volatile NoisePayload representative; - // The noise thread's own profiler tid - published alongside the payload so - // the seeding below can qualify exactly that thread for the noise klass - // (selectLeakCandidates()'s per-(klass, tid) gate matches the tid that - // actually allocated the noise instances, and that is this thread). + // The noise thread's own profiler tid, published alongside the payload so the seeding below + // can qualify exactly that thread (the per-(klass, tid) gate matches the tid that actually + // allocated the noise instances). volatile int tid; void publish(NoisePayload payload, int tid) { - // tid FIRST (volatile ordering): a caller that sees `representative` set - // is then also guaranteed to see the tid published with it. + // tid FIRST (volatile ordering): a caller that sees `representative` set is then also + // guaranteed to see the tid published with it. this.tid = tid; representative = payload; } @@ -185,10 +178,10 @@ NoisePayload take() { public static final String NOISE_CHAIN_MARKER = "[correlation-noise-chain-emitted] "; /** - * One dump's scan outcome - payload fields per one dump; the violation lists - * are accumulated across scans by keepBest() whenever it retains an earlier best. + * One dump's scan outcome - payload fields per one dump; the violation lists are accumulated + * across every scan by keepBest(), regardless of which scan's payload is kept. */ - private static final class ScanResult { + static final class ScanResult { ReferenceChainAssertions.ChainMatch payloadChain; boolean payloadChainInPool; int liveObjectMatchesForChainTag; @@ -247,26 +240,21 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD int noiseTid = 0; if (debugBuild) { // Representatives FIRST, seeds second: since the leak-tag pool redesign, candidate - // matching, leak-tag assignment (tagLeakInstances scanning the live-heap tracking - // table), and discovered-instance recording are all keyed on the REAL klass id - - // setKlassPopulationRepresentativeForTest0 resolves each representative's real id - // and aliases the synthetic id to it, and the hysteresis seeds below then land in - // the real entry (seeding first would leave them under the synthetic id, where they - // authorize nothing but hasLeakSignal's candidate-count check). - // The leak representative is durably reachable via LEAK_SINK for the rest of the - // process's life; the noise representative only via the noise thread's frame (the - // handoff's own reference is dropped by take()) - exactly what makes one a valid - // leak candidate and the other a gate test. + // matching, leak-tag assignment, and discovered-instance recording are all keyed on the + // REAL klass id - setting the representative registers the synthetic->real alias, so the + // seeds below land in the real entry (seeding first would leave them under the synthetic + // id, where they authorize nothing but hasLeakSignal's candidate-count check). + // The leak representative is durably reachable via LEAK_SINK; the noise representative + // only via the noise thread's frame - exactly what makes one a valid leak candidate and + // the other a gate test. ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( LEAK_KLASS_ID, LEAK_SINK.get(0)); - // The noise thread publishes asynchronously (after allocating its payloads); - // wait (bounded) for it rather than racing take() into a null representative / tid 0. + // The noise thread publishes asynchronously; wait (bounded) rather than racing take() + // into a null representative / tid 0. for (int i = 0; i < 200 && handoff.representative == null; i++) { Thread.sleep(25); } NoisePayload noiseRepresentative = handoff.take(); - // tid is published before representative (NoiseHandoff.publish()), so it is - // visible once take() has observed a non-null payload. noiseTid = handoff.tid; if (noiseRepresentative == null || noiseTid == 0) { throw new IllegalStateException("noise thread never published its representative/tid" @@ -275,14 +263,11 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( NOISE_KLASS_ID, noiseRepresentative); noiseRepresentative = null; // keep retention transient: drop this frame's reference - // Per-(klass, tid) qualification seeds: selectLeakCandidates() now also - // requires a qualifying ALLOCATING THREAD, and tagLeakInstances() scopes leak - // tags to exactly those tids' instances - so the seeded qualification must - // name the REAL allocating tids (this thread for the leak chunks, the noise - // thread for the noise payloads) or no tracked instance would ever match - // the tagging scope. Same epoch-aligned ramp shape as the klass seeds - // (scaled to fit the per-tid u8 ring); the synthetic flag keeps these - // ramps immune to the real fold's absent-tid decay between rounds. + // Per-(klass, tid) seeds must name the REAL allocating tids (this thread for the leak + // chunks, the noise thread for the noise payloads) or no tracked instance would ever match + // the tagging scope. Same epoch-aligned ramp shape as the klass seeds (scaled to fit the + // per-tid u8 ring); the synthetic flag keeps these ramps immune to the real fold's + // absent-tid decay between rounds. leakTid = ReferenceChainTestHooks.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); @@ -312,17 +297,15 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD Thread.sleep(5000); } - // Each dump re-emits every resolved chain (drainPendingChainEvents()'s - // snapshot-and-keep contract), so a later dump's scan is usually a superset state - - // the latest scan is preferred, except that keepBest() never lets a later, worse - // payload chain (e.g. out-of-pool) displace an earlier in-pool/correlated one; the - // gate violations of every retained-over scan are accumulated. + // Each dump re-emits every resolved chain (snapshot-and-keep), so a later dump's scan is + // usually a superset state - the latest scan is preferred, except keepBest() never lets a + // later, worse payload chain displace an earlier in-pool/correlated one; gate violations of + // every scanned dump are accumulated into the kept result. ScanResult best = null; int totalRounds = 25; - // Slow growth per round is deliberate: each chunk clears the allocation - // sampler's floor on its own (see CHUNK_BYTES), so every allocation is - // sampled, tracked, and taggable - the per-round population growth is - // only the trend signal, not a sampling-volume requirement. + // Slow growth per round is deliberate: each chunk clears the allocation sampler's floor on + // its own (see CHUNK_BYTES), so every allocation is sampled, tracked, and taggable - the + // per-round population growth is only the trend signal, not a sampling-volume requirement. for (int round = 1; round <= totalRounds; round++) { addChunk(); if (debugBuild) { @@ -338,14 +321,12 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } System.gc(); profiler.dump(scratchDumpPath); - // Scan only every 3rd round: each scan's JMC parse allocates megabytes - // on this same JVM, and that churn races the leak chunks for space in - // LivenessTracker's tracking table (the age-priority tagging then - // selects old JVM-machinery survivors instead of the young chunks - - // observed live as tagged=5 stable but zero interceptions). Less - // scan churn gives the chunks time to accumulate surviving ages and - // win the tagging priority. Rounds are still dumped every time so - // the final dump always holds the freshest chains. + // Scan only every 3rd round: each scan's JMC parse allocates megabytes on this same JVM, + // and that churn races the leak chunks for space in LivenessTracker's tracking table (the + // age-priority tagging then selects old JVM-machinery survivors instead of the young + // chunks - observed live as tagged=5 stable but zero interceptions). Less scan churn gives + // the chunks time to accumulate surviving ages and win the tagging priority. Rounds are + // still dumped every time so the final dump always holds the freshest chains. if (round % 3 == 0) { best = keepBest(best, scan(scratchDumpPath)); if (best != null && best.payloadChainInPool @@ -377,27 +358,34 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD best = keepBest(best, scan(scratchDumpPath)); } - if (best == null || best.payloadChain == null) { - System.out.println(NOT_FOUND_MARKER); - return; + System.out.println(resultLine(best)); + } + + /** + * The one result line run() prints for the kept scan. Gate violations outrank every payload + * outcome, including "no payload chain found": the tight-window caller accepts NOT_FOUND, so a + * violation reported only behind a found payload would be masked there. + */ + static String resultLine(ScanResult best) { + if (best == null) { + return NOT_FOUND_MARKER; } if (!best.transientViolations.isEmpty()) { - System.out.println(TRANSIENT_CHAIN_MARKER + best.transientViolations); - return; + return TRANSIENT_CHAIN_MARKER + best.transientViolations; } if (!best.noiseChains.isEmpty()) { - System.out.println(NOISE_CHAIN_MARKER + best.noiseChains); - return; + return NOISE_CHAIN_MARKER + best.noiseChains; + } + if (best.payloadChain == null) { + return NOT_FOUND_MARKER; } if (!best.payloadChainInPool) { - System.out.println(TAG_OUT_OF_POOL_MARKER + best.payloadChain.targetTag); - return; + return TAG_OUT_OF_POOL_MARKER + best.payloadChain.targetTag; } if (best.liveObjectMatchesForChainTag == 0) { - System.out.println(NO_LIVE_OBJECT_MARKER + best.payloadChain.targetTag); - return; + return NO_LIVE_OBJECT_MARKER + best.payloadChain.targetTag; } - System.out.println(FOUND_MARKER + best.payloadChain.targetTag); + return FOUND_MARKER + best.payloadChain.targetTag; } /** @@ -405,22 +393,22 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD * same in-pool preference scan() applies within a single dump): a later scan replaces * {@code best} only when its payload chain is at least as good - no chain < out-of-pool * chain < in-pool chain < in-pool chain with a matching live object; at equal quality - * the newer scan wins. Whenever the earlier best is kept, the incoming scan's gate - * violations are merged into it so a later dump's transient/noise chain is never hidden. + * the newer scan wins. The losing scan's gate violations are always merged into the winner + * (both directions), so a transient/noise chain seen in any dump is never hidden by a + * better-quality scan from another dump. */ - private static ScanResult keepBest(ScanResult best, ScanResult scan) { + static ScanResult keepBest(ScanResult best, ScanResult scan) { if (scan == null) { return best; } if (best == null) { return scan; } - if (quality(scan) >= quality(best)) { - return scan; - } - mergeViolations(best.transientViolations, scan.transientViolations); - mergeViolations(best.noiseChains, scan.noiseChains); - return best; + ScanResult winner = quality(scan) >= quality(best) ? scan : best; + ScanResult loser = winner == scan ? best : scan; + mergeViolations(winner.transientViolations, loser.transientViolations); + mergeViolations(winner.noiseChains, loser.noiseChains); + return winner; } /** 0: no chain, 1: out-of-pool chain, 2: in-pool chain, 3: in-pool and correlated. */ @@ -491,12 +479,10 @@ private static ScanResult scan(Path scratchDumpPath) throws Exception { if ("byte[]".equals(leaf)) { boolean inPool = targetTag >= LEAK_TAG_BASE && targetTag < LEAK_TAG_BASE + LEAK_TAG_POOL_SIZE; - // Multiple byte[] chains exist in a single dump: every discovered - // instance of the candidate class gets one, and only the tracked-and- - // tagged instances carry a pool-range targetTag - the rest legitimately - // carry their frontier tag (the correlation is additive on top of the - // chain, not a property of every chain). Prefer the first in-pool - // (correlated) chain over any out-of-pool one seen earlier. + // Multiple byte[] chains exist in a single dump: every discovered instance of the + // candidate class gets one, and only the tracked-and-tagged instances carry a + // pool-range targetTag. Prefer the first in-pool (correlated) chain over any + // out-of-pool one seen earlier. if ((inPool && !result.payloadChainInPool) || result.payloadChain == null) { List chain = new ArrayList<>(rawChain.length); for (Object element : rawChain) { diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenarioKeepBestTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenarioKeepBestTest.java new file mode 100644 index 0000000000..844ac82cd2 --- /dev/null +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenarioKeepBestTest.java @@ -0,0 +1,142 @@ +/* + * Copyright 2026, Datadog, Inc. + * SPDX-License-Identifier: Apache-2.0 + */ + +package com.datadoghq.profiler.referencechains; + +import org.junit.jupiter.api.Test; +import org.openjdk.jmc.common.IMCType; + +import java.util.Arrays; +import java.util.Collections; +import java.util.List; + +import static org.junit.jupiter.api.Assertions.assertEquals; +import static org.junit.jupiter.api.Assertions.assertNull; +import static org.junit.jupiter.api.Assertions.assertSame; +import static org.junit.jupiter.api.Assertions.assertTrue; + +/** + * Plain-JUnit checks (no profiler, no dump) for {@link LeakTagCorrelationScenario#keepBest} and + * {@link LeakTagCorrelationScenario#resultLine}: a gate violation seen in any scanned dump must + * survive into the kept result regardless of which scan's payload wins, and must outrank every + * payload outcome - including "no payload chain found" - in the printed result line. + */ +public class LeakTagCorrelationScenarioKeepBestTest { + + /** + * quality 0: no payload chain; 1: out-of-pool chain; 2: in-pool, no live object; 3: in-pool and + * correlated. Violations prefixed "T:" go to transientViolations, "N:" to noiseChains. + */ + private static LeakTagCorrelationScenario.ScanResult scan( + int quality, long tag, String... violations) { + LeakTagCorrelationScenario.ScanResult r = new LeakTagCorrelationScenario.ScanResult(); + if (quality >= 1) { + r.payloadChain = + new ReferenceChainAssertions.ChainMatch(Collections.emptyList(), tag, 2); + r.payloadChainInPool = quality >= 2; + r.liveObjectMatchesForChainTag = quality >= 3 ? 1 : 0; + } + for (String v : violations) { + if (v.startsWith("T:")) { + r.transientViolations.add(v); + } else if (v.startsWith("N:")) { + r.noiseChains.add(v); + } else { + throw new IllegalArgumentException("violation must start with T: or N: - " + v); + } + } + return r; + } + + private static LeakTagCorrelationScenario.ScanResult fold( + List scans) { + LeakTagCorrelationScenario.ScanResult best = null; + for (LeakTagCorrelationScenario.ScanResult s : scans) { + best = LeakTagCorrelationScenario.keepBest(best, s); + } + return best; + } + + @Test + public void earlierViolationSurvivesBetterLaterScan() { + LeakTagCorrelationScenario.ScanResult best = scan(1, 1, "T:a"); + LeakTagCorrelationScenario.ScanResult later = scan(3, 2); + LeakTagCorrelationScenario.ScanResult kept = LeakTagCorrelationScenario.keepBest(best, later); + assertEquals(2, kept.payloadChain.targetTag, "the better later scan's payload must win"); + assertEquals(Collections.singletonList("T:a"), kept.transientViolations, + "the earlier dump's transient violation must not be hidden by a better later scan"); + } + + @Test + public void laterViolationSurvivesWorseLaterScan() { + LeakTagCorrelationScenario.ScanResult best = scan(3, 1, "N:x"); + LeakTagCorrelationScenario.ScanResult later = scan(1, 2, "T:b"); + LeakTagCorrelationScenario.ScanResult kept = LeakTagCorrelationScenario.keepBest(best, later); + assertEquals(1, kept.payloadChain.targetTag, "the better earlier payload must be kept"); + assertEquals(Collections.singletonList("T:b"), kept.transientViolations); + assertEquals(Collections.singletonList("N:x"), kept.noiseChains); + } + + @Test + public void violationsAccumulateRegardlessOfScanOrder() { + LeakTagCorrelationScenario.ScanResult forward = + fold(Arrays.asList(scan(1, 1, "T:a"), scan(3, 2), scan(2, 3, "N:y"))); + assertTrue(forward.transientViolations.contains("T:a"), forward.transientViolations.toString()); + assertTrue(forward.noiseChains.contains("N:y"), forward.noiseChains.toString()); + + LeakTagCorrelationScenario.ScanResult reverse = + fold(Arrays.asList(scan(2, 3, "N:y"), scan(3, 2), scan(1, 1, "T:a"))); + assertTrue(reverse.transientViolations.contains("T:a"), reverse.transientViolations.toString()); + assertTrue(reverse.noiseChains.contains("N:y"), reverse.noiseChains.toString()); + } + + @Test + public void newerScanWinsPayloadTieButKeepsEarlierViolations() { + LeakTagCorrelationScenario.ScanResult best = scan(2, 10, "T:a"); + LeakTagCorrelationScenario.ScanResult later = scan(2, 11); + LeakTagCorrelationScenario.ScanResult kept = LeakTagCorrelationScenario.keepBest(best, later); + assertEquals(11, kept.payloadChain.targetTag, "at equal quality the newer scan wins"); + assertTrue(kept.transientViolations.contains("T:a"), kept.transientViolations.toString()); + } + + @Test + public void mergedViolationsAreDeduplicated() { + LeakTagCorrelationScenario.ScanResult kept = + LeakTagCorrelationScenario.keepBest(scan(1, 1, "T:a"), scan(3, 2, "T:a")); + assertEquals(1, kept.transientViolations.size(), kept.transientViolations.toString()); + } + + @Test + public void nullInputsReturnTheOtherSide() { + LeakTagCorrelationScenario.ScanResult s = scan(1, 1); + LeakTagCorrelationScenario.ScanResult b = scan(2, 2); + assertSame(s, LeakTagCorrelationScenario.keepBest(null, s)); + assertSame(b, LeakTagCorrelationScenario.keepBest(b, null)); + assertNull(LeakTagCorrelationScenario.keepBest(null, null)); + } + + @Test + public void resultLineRanksGateViolationsAboveEveryPayloadOutcome() { + assertEquals(LeakTagCorrelationScenario.NOT_FOUND_MARKER, + LeakTagCorrelationScenario.resultLine(null)); + assertTrue(LeakTagCorrelationScenario.resultLine(scan(0, 0, "T:a")) + .startsWith(LeakTagCorrelationScenario.TRANSIENT_CHAIN_MARKER), + "a transient violation without any payload chain must not be reported as NOT_FOUND"); + assertTrue(LeakTagCorrelationScenario.resultLine(scan(0, 0, "N:x")) + .startsWith(LeakTagCorrelationScenario.NOISE_CHAIN_MARKER), + "a noise chain without any payload chain must not be reported as NOT_FOUND"); + assertTrue(LeakTagCorrelationScenario.resultLine(scan(3, 5, "T:a", "N:x")) + .startsWith(LeakTagCorrelationScenario.TRANSIENT_CHAIN_MARKER), + "transient outranks noise, and both outrank FOUND"); + assertEquals(LeakTagCorrelationScenario.NOT_FOUND_MARKER, + LeakTagCorrelationScenario.resultLine(scan(0, 0))); + assertTrue(LeakTagCorrelationScenario.resultLine(scan(1, 5)) + .startsWith(LeakTagCorrelationScenario.TAG_OUT_OF_POOL_MARKER)); + assertTrue(LeakTagCorrelationScenario.resultLine(scan(2, 5)) + .startsWith(LeakTagCorrelationScenario.NO_LIVE_OBJECT_MARKER)); + assertEquals(LeakTagCorrelationScenario.FOUND_MARKER + 7, + LeakTagCorrelationScenario.resultLine(scan(3, 7))); + } +} diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java index 60b4f118d9..0c43438bb7 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java @@ -5,8 +5,8 @@ package com.datadoghq.profiler.referencechains; -import org.junit.jupiter.api.Assumptions; import org.junit.jupiter.api.Test; +import org.junit.jupiter.api.Assumptions; import org.openjdk.jmc.common.IMCType; import org.openjdk.jmc.common.item.IAccessorKey; import org.openjdk.jmc.common.item.IItem; @@ -34,45 +34,38 @@ import static org.junit.jupiter.api.Assertions.fail; /** - * PROF-15341 design doc, Open Question: does JMC's parser actually resolve the {@code - * datadog.ReferenceChain} event's {@code chain} field - declared in jfrMetadata.cpp as {@code - * field("chain", T_CLASS, ..., F_CPOOL | F_ARRAY)}, i.e. an array of scalar - * constant-pool-index {@code T_CLASS} values - the same way it resolves a plain scalar - * F_CPOOL field (e.g. {@code objectClass}, already exercised by {@code AbstractProfilerTest}) - * or a plain F_ARRAY-of-composite-struct field (e.g. {@code jdk.StackTrace#frames})? Neither - * already-exercised shape proves this exact combination. + * PROF-15341 design doc, Open Question: does JMC's parser resolve the {@code datadog.ReferenceChain} + * event's {@code chain} field - declared in jfrMetadata.cpp as {@code field("chain", T_CLASS, + * ..., F_CPOOL | F_ARRAY)}, an array of scalar constant-pool-index {@code T_CLASS} + * values - the same way it resolves a plain scalar F_CPOOL field ({@code objectClass}) or a + * plain F_ARRAY-of-composite-struct field ({@code jdk.StackTrace#frames})? Neither shape proves + * this combination. * - *

      This test loads the standalone .jfr file produced by the companion gtest ({@code - * ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp}) directly via {@link - * JfrLoaderToolkit} - no live profiler attach, no {@code AbstractProfilerTest} lifecycle - and - * asserts the {@code chain} field resolves to the exact class names that gtest seeded, in the - * exact leaf-to-root order {@code ReferenceChainTracker::buildChainEvent()} (referenceChains.h) - * produces. + *

      Loads the standalone .jfr file produced by the companion gtest + * ({@code referenceChainJfrRoundtrip_ut.cpp}) directly via {@link JfrLoaderToolkit} - no live + * profiler attach - and asserts the {@code chain} field resolves to the exact class names the + * gtest seeded, in the leaf-to-root order {@code buildChainEvent()} produces. * *

      Why a generic accessor, not {@code Attribute.attr(...)}: JMC's v1 chunk parser - * (internal.parser.v1.ValueReaders.ArrayReader#getContentType()) registers {@code - * UnitLookup.UNKNOWN} as the declared content type for every array field, regardless of - * what its element reader resolves to - this is generic to all array fields, not specific to the - * cpool case. A field registered as UNKNOWN cannot be bound via {@code - * Attribute.attr(id, name, desc, CLASS).getAccessor(type)} (that requires the field's registered - * content type to match). This test instead looks the field up by identifier via {@code - * IType#getAccessorKeys()} and calls {@code IType#getAccessor(IAccessorKey)} directly - the same - * lower-level lookup JMC's own UI uses for fields it has no compile-time-known attribute for. - * This is not a workaround for a missing capability; it is the correct API for an unregistered - * custom field, and it still calls through the very code - * ({@code ArrayReader.read()}/{@code resolve()} delegating per-element to the field's element - * reader, which for {@code chain} is a {@code PoolReader}) that resolves each array element's - * constant-pool index to its class - the actual thing this test exists to prove. + * registers {@code UnitLookup.UNKNOWN} as the declared content type for every array + * field, regardless of what its element reader resolves to, and a field registered as UNKNOWN + * cannot be bound via a compile-time-typed {@code Attribute}. This test looks the field up by + * identifier via {@code IType#getAccessorKeys()} and calls {@code IType#getAccessor(IAccessorKey)} + * directly - the same lookup JMC's own UI uses for fields it has no compile-time-known attribute + * for. It still calls through the code ({@code ArrayReader.read()}/{@code resolve()} delegating + * per-element to the field's {@code PoolReader}) that resolves each element's constant-pool index + * to its class - the actual thing this test exists to prove. */ public class ReferenceChainJfrParserTest { private static final String EVENT_TYPE = "datadog.ReferenceChain"; /** - * Same path {@code chainRoundtripJfrPath()} in the companion gtest resolves to: the OS temp - * dir (TMPDIR, falling back to /tmp), agreed by both sides rather than by a shared build - * directory - the gtest (ddprof-lib) and this test (ddprof-test) are different Gradle - * modules/tasks with no other filesystem contract between them. + * Same path the companion gtest resolves to: the OS temp dir (TMPDIR, falling back to /tmp), + * agreed by both sides - the gtest (ddprof-lib) and this test (ddprof-test) are different + * Gradle modules with no other filesystem contract between them. The file is consume-once: this + * test deletes it after loading and the gtest unlinks it before regenerating, so a stale fixture + * from an earlier build can never satisfy the existence assumption below. */ private static Path roundtripJfrPath() { String tmp = System.getenv("TMPDIR"); @@ -84,12 +77,8 @@ private static Path roundtripJfrPath() { public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() throws IOException, CouldNotLoadRecordingException { Path jfrPath = roundtripJfrPath(); - // Assumption, not assertion: the fixture is produced by the companion gtest - // (referenceChainJfrRoundtrip_ut.cpp), which does not run on CI runners - // without Google Test (e.g. the el7 testRelease job) - there the file can - // never exist and this test would fail spuriously. Where the gtest ran in - // the same Gradle invocation (local testDebug, gtest-equipped CI jobs), the - // file exists and the test executes; otherwise it is skipped. + // CI runners without Google Test (e.g. el7), or runs where the gtest has not re-run since the + // fixture was last consumed, have no fixture - skip rather than fail. Assumptions.assumeTrue(Files.exists(jfrPath), "Expected " + jfrPath + " to exist - run " + ":ddprof-lib:gtestDebug_referenceChainJfrRoundtrip_ut first " @@ -98,6 +87,11 @@ public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() IItemCollection events; try (InputStream in = Files.newInputStream(jfrPath)) { events = JfrLoaderToolkit.loadEvents(in); + } finally { + // Consume-once (see roundtripJfrPath()): loadEvents() fully materializes the recording, so + // the shared fixture can go now - even on a parse failure - and a later run only ever sees + // a file freshly written by the gtest. + Files.deleteIfExists(jfrPath); } IItemCollection chainEvents = events.apply(ItemFilters.type(EVENT_TYPE)); assertTrue(chainEvents.hasItems(), "Expected at least one " + EVENT_TYPE + " event"); @@ -134,10 +128,9 @@ public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() chain.add((IMCType) element); } resolvedChain = chain; - // Retention-edge labels: one per chain hop, aligned with it (the - // gtest seeds kind labels because its JNIEnv is null - the label - // DECODE is skipped; the Java side validates the ARRAY FIELD parses, - // not the decode itself, which referenceChains_ut covers natively). + // Retention-edge labels: one per chain hop, aligned with it. The gtest seeds kind labels + // because its JNIEnv is null - the label DECODE is skipped; the Java side validates the + // ARRAY FIELD parses, not the decode itself (referenceChains_ut covers that natively). Object edgesValue = edgesAccessor.getMember(item); assertNotNull(edgesValue, "'edges' field resolved to null"); assertTrue(edgesValue instanceof Object[], diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java index cfbe851f0e..4868012a3e 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java @@ -24,7 +24,6 @@ import java.util.concurrent.atomic.AtomicLong; import java.util.concurrent.atomic.AtomicReference; import java.nio.file.Path; -import java.nio.file.Paths; import java.util.ArrayList; import java.util.HashMap; import java.util.List; @@ -35,108 +34,76 @@ import static org.junit.jupiter.api.Assertions.assertTrue; /** - * PROF-15341 (+ lifecycle-wiring follow-up, + the Remaining Work Plan's target-selection bridging, - * pause-time pacing, and reporting work): end-to-end - * coverage for {@code ReferenceChainTracker} (ddprof-lib/src/main/cpp/referenceChains.h/.cpp). + * PROF-15341 (+ lifecycle-wiring follow-up): end-to-end coverage for + * {@code ReferenceChainTracker} (ddprof-lib/src/main/cpp/referenceChains.h/.cpp). * - *

      Scope note: {@code ReferenceChainTracker::start()} is now called from - * {@code Profiler::start()} (profiler.cpp), gated on {@code args._reference_chains}, followed by - * {@code ReferenceChainTracker::startThread()} which spawns its BFS thread; {@code Profiler::stop()} - * calls the matching {@code stopThread()}/{@code stop()} pair. A {@code datadog.ReferenceChainAbandoned} - * event now reaches a live {@code Recording}: {@code Profiler::dump()} calls - * {@code buildAbandonedEvent()} and writes its output via - * {@code Profiler::writeReferenceChainAbandoned()}/{@code FlightRecorder::recordReferenceChainAbandoned()} - * whenever the search has ended in {@code SearchState::ABANDONED} - mirroring the - * {@code LivenessTracker::flush()} call site there. {@link #shouldReportAbandonedSearchOnTinyFrontierCap()} - * exercises that path end-to-end below. + *

      {@code ReferenceChainTracker::start()} is called from {@code Profiler::start()}, gated on + * {@code args._reference_chains}, followed by {@code startThread()} which spawns its BFS thread; + * {@code Profiler::stop()} calls the matching {@code stopThread()}/{@code stop()} pair. A + * {@code datadog.ReferenceChainAbandoned} event reaches a live {@code Recording}: {@code + * Profiler::dump()} calls {@code buildAbandonedEvent()} and writes its output whenever the search + * ended in {@code SearchState::ABANDONED} - mirroring {@code LivenessTracker::flush()}'s call site + * there. {@link #shouldReportAbandonedSearchOnTinyFrontierCap()} exercises that path end-to-end. * - *

      {@code buildChainEvent()}'s target-selection feed (Remaining Work Plan's target-selection - * bridging step): - * {@code ReferenceChainTracker::pollWatchedTargets()} (referenceChains.cpp), called from - * {@code threadLoop()} once per scheduling cycle after {@code runPass()}, closes the gap this class's - * header comment used to describe as unclosed. It polls - * {@code LivenessTracker::selectLeakCandidates()} (positive population-slope ranking over a rolling - * per-klass survivor-count window, gated on {@code _gc_generations} - design doc's Open Question 3) - * and, for each ranked klass whose representative instance an ordinary {@code runPass()} walk has - * *already* tagged ({@code getTag() > 0} - a read, never a {@code SetTag} seed), reconstructs and - * emits its chain via {@code Profiler::writeReferenceChain()}. {@link #shouldReconstructReferrerChainToGcRoot()} - * below exercises this end to end against a real JVM, real GCs, and a real JVMTI heap walk - not a - * synthetic frontier fixture (see {@code referenceChainJfrRoundtrip_ut.cpp}/{@code ReferenceChainJfrParserTest} - * for that already-covered, lower-level reconstruction-correctness proof). + *

      Target-selection bridging: {@code pollWatchedTargets()} (referenceChains.cpp), called + * from {@code threadLoop()} once per scheduling cycle after {@code runPass()}, polls + * {@code LivenessTracker::selectLeakCandidates()} (positive population-slope ranking over a + * rolling per-klass survivor-count window, gated on {@code _gc_generations}) and, for each ranked + * klass whose representative instance an ordinary {@code runPass()} walk has *already* tagged + * ({@code getTag() > 0} - a read, never a {@code SetTag} seed), reconstructs and emits its chain + * via {@code Profiler::writeReferenceChain()}. {@link #shouldReconstructReferrerChainToGcRoot()} + * exercises this end to end against a real JVM, real GCs, and a real JVMTI heap walk - the + * synthetic-frontier reconstruction-correctness proof lives in + * {@code referenceChainJfrRoundtrip_ut.cpp}/{@code ReferenceChainJfrParserTest}. * *

      Why {@code @TestMethodOrder}/{@code @Order(1)}: {@code ReferenceChainTracker} is a - * process-wide singleton whose single, singleton-owned search (design doc's Open Question 3 - * "Shipped" note) never restarts once it leaves {@code SearchState::RUNNING} - - * {@code shouldRunPass()} (referenceChains.cpp) returns {@code false} forever after that point, and - * the transition itself releases every tag the search ever assigned - * ({@code releaseSearchTags()}). Its {@code FrontierTable} is sized once, the first time any test - * in this JVM calls {@code ReferenceChainTracker::start()}, and never resized on later - * start()/stop() cycles (referenceChains.cpp's {@code if (_frontier == nullptr)} guard) - so - * whichever test runs first also fixes that capacity for every test that runs after it in the same - * JVM (no {@code forkEvery} configured, see {@code ProfilerTestPlugin.kt}, so this whole class runs - * in one). {@link #shouldReportAbandonedSearchOnTinyFrontierCap()} below deliberately drives that - * shared search to {@code SearchState::ABANDONED}, via an artificially tiny frontier cap when it - * gets to build the table itself, or its own {@code ttl} fallback otherwise (see that method's own - * comment). Both {@link #shouldReconstructReferrerChainToGcRoot()} and - * {@link #shouldReconstructReferrerChainThroughUnboundedCacheLeak()} need the search still - * {@code RUNNING} to find their own candidates' tags non-zero, so they are pinned to run first, - * via {@code @Order(1)}/{@code @Order(2)} respectively - without that ordering all three tests - * would race for which ones get to observe a still-{@code RUNNING} search, and neither - * success-path test has a fallback for losing that race the way the abandonment test does. The - * relative order between the two success-path tests does not itself matter - both target - * different klasses ({@link ChainLink} vs {@link CachedPayload}) within the same shared search, - * and neither exhausts it - only their both running before the abandonment test does. + * process-wide singleton whose single search never restarts once it leaves + * {@code SearchState::RUNNING} - {@code shouldRunPass()} returns {@code false} forever after that + * point, and the transition releases every tag the search ever assigned. Its {@code FrontierTable} + * is sized once, the first time any test in this JVM calls {@code ReferenceChainTracker::start()} + * (the {@code if (_frontier == nullptr)} guard), and never resized on later start()/stop() cycles + * - so whichever test runs first also fixes that capacity for every test after it (no + * {@code forkEvery} configured, so this whole class runs in one JVM). The abandonment test + * deliberately drives that shared search to {@code ABANDONED}; both success-path tests need it + * still {@code RUNNING} to find their own candidates' tags non-zero, so they are pinned first via + * {@code @Order(1)}/{@code @Order(2)}. Their relative order between themselves does not matter - + * they target different klasses within the same shared search and neither exhausts it - only + * both running before the abandonment test does. */ @TestMethodOrder(MethodOrderer.OrderAnnotation.class) @Tag("slow") public class ReferenceChainTrackingTest extends AbstractProfilerTest { - // Arbitrary, test-chosen klass ids for the debug-only population-seeding seams below (see - // ReferenceChainTestSeamsTest's own comment: LivenessTracker's population table treats these as - // opaque keys, so they need not resolve to any real class). Distinct per test/from - // ReferenceChainTestSeamsTest's own ids purely as cheap insurance against collision in a shared, - // no-forkEvery test JVM. + // Arbitrary, test-chosen klass ids for the debug-only population-seeding seams below - + // LivenessTracker's population table treats them as opaque keys. Distinct per test purely as + // cheap insurance against collision in a shared, no-forkEvery test JVM. private static final int CHAIN_LINK_TEST_KLASS_ID = 987201; private static final int CACHED_PAYLOAD_TEST_KLASS_ID = 987202; - // Durable (static-field) holder for the gc-root fixture below. The - // discovered-chain gate suppresses chains shallower than the first real - // holder hop that are rooted at a TRANSIENT root (stack/JNI local) - a - // frame-held "leak" is by definition not a leak - and - // shouldReconstructReferrerChainToGcRoot()'s ChainLink instances sit at - // depth 1 of a locally-held list, exactly the transient-rooted shape the - // gate exists to suppress. A static field gives them the real - // unmaintained-singleton-collection retention shape instead. (The cache - // fixture below needs no such change: its CachedPayload chains are three - // hops deep through HashMap's own internals, which the gate correctly - // lets through regardless of root kind.) Cleared in the test's finally: - // this is a shared, no-forkEvery test JVM, and a leftover holder would - // keep its entire population reachable for every later test here. + // Durable (static-field) holder for the gc-root fixture below. The discovered-chain gate + // suppresses chains shallower than the first real holder hop that are rooted at a TRANSIENT + // root (stack/JNI local) - a frame-held "leak" is by definition not a leak - and the ChainLink + // instances sit at depth 1 of a locally-held list, exactly that shape. A static field gives + // them the real unmaintained-singleton-collection retention shape instead. (The cache fixture + // needs no such change: CachedPayload chains are three hops deep through HashMap's own + // internals, which the gate lets through regardless of root kind.) Cleared in the test's + // finally - a leftover holder would keep its entire population reachable for every later test + // in this shared JVM. private static List gcRootHolder; - // The current round's allocation batch, handed to the persistent allocator - // thread below. Volatile: written here, read by the allocator thread every - // round - the request queue's happens-before (offer after set, take before - // read) already covers it, but the visibility of a plain field handed - // across threads is kept explicit rather than relying on queue semantics - // alone. + // The current round's allocation batch, handed to the persistent allocator thread below. + // Volatile: written here, read by the allocator thread every round - the request queue's + // happens-before already covers it, but the visibility of a plain field handed across threads + // is kept explicit rather than relying on queue semantics alone. private static volatile List currentBatch; - // LivenessTracker's own hysteresis gate (livenessTracker.h's - // KLASS_POPULATION_MIN_FILL_FOR_TREND=10 / LEAK_TREND_HYSTERESIS_BASE=5; - // livenessTracker.cpp's recordKlassPopulationSampleLocked()/hasQualifyingGrowth()) only starts - // incrementing KlassPopulationEntry::consecutive_positive once ring_fill has reached 10 - every - // call before that resets it straight back to 0 (ringThirdsStats()'s own fill < min_fill guard). - // A single batch of exactly 10 seedKlassPopulationSample0() calls therefore caps - // consecutive_positive at 1 (only the 10th call ever sees ring_fill==10), far short of the >=5 - // (or >=3 if LivenessTracker::heapFloorRising() independently corroborates) that - // selectLeakCandidates() (livenessTracker.cpp) requires before it reports a candidate at all - - // which is what ReferenceChainTracker::hasLeakSignal() consults, and what shouldRunPass() - // (referenceChains.cpp) gates even this search's very first pass on whenever generations=true - // (see this class's own header comment on why runPass() never otherwise fires here without one). - // 10 (KLASS_POPULATION_MIN_FILL_FOR_TREND) + 5 (LEAK_TREND_HYSTERESIS_BASE) - 1 = 14 calls are - // the minimum for the 5 qualifying calls at ring_fill>=10 (epochs 10-14) to actually land; +1 - // for margin against off-by-one uncertainty in that derivation. + // LivenessTracker's hysteresis gate (KLASS_POPULATION_MIN_FILL_FOR_TREND=10 / + // LEAK_TREND_HYSTERESIS_BASE=5) only starts incrementing consecutive_positive once ring_fill + // has reached 10 - every call before that resets it back to 0. A single batch of 10 seed + // calls therefore caps consecutive_positive at 1, far short of the >=5 that + // selectLeakCandidates() requires. 10 + 5 - 1 = 14 calls is the minimum for the 5 qualifying + // calls at ring_fill>=10 (epochs 10-14) to land; +1 for margin against off-by-one uncertainty + // in that derivation. private static final int SEED_EPOCHS_FOR_HYSTERESIS = 15; // Dedicated id for shouldReportAbandonedSearchOnTinyFrontierCap()'s own seeding (see that @@ -144,9 +111,8 @@ public class ReferenceChainTrackingTest extends AbstractProfilerTest { // for the same cheap-insurance-against-collision reason those two are distinct from each other. private static final int ABANDON_TEST_KLASS_ID = 987203; - // Upper bound on any single main-thread wait for a persistent allocator thread (tid - // publication or one round's batch): a dead/stuck allocator must fail the test, not hang the - // shared, no-forkEvery ddprof-test fork. + // Upper bound on any single main-thread wait for the persistent allocator thread: a + // dead/stuck allocator must fail the test, not hang the shared test fork. private static final long ALLOCATOR_HANDOFF_TIMEOUT_MS = 30_000; @Override @@ -156,123 +122,77 @@ protected String getProfilerCommand() { : ""; if ("shouldReconstructReferrerChainToGcRoot".equals(testName) || "shouldReconstructReferrerChainThroughUnboundedCacheLeak".equals(testName)) { - // memory=...:l + generations=true: LivenessTracker::gcGenerationsEnabled() (Remaining - // Work Plan's population tracking / target-selection bridging, livenessTracker.h) must be true for pollWatchedTargets() - // (referenceChains.cpp) to do anything at all - referencechains=... alone stays - // whole-graph-only (design doc's Open Question 3 "still undecided" fallback). A small - // sampling interval maximizes the chance the many ChainLink instances this test - // allocates below actually get liveness-tracked (LivenessTracker::track(), invoked from - // the allocation-sampling path whenever _gc_generations || _record_liveness is set, - // objectSampler.cpp). A large framecap avoids an early - // SearchAbandonReason::FRONTIER_CAP abandonment against this JVM's real, - // not-controlled-by-this-test root-reachable graph size, and a long ttl avoids a - // TTL abandonment mid-test - either would call releaseSearchTags() and permanently - // zero every tag this test depends on (see this class's header comment on why this - // test is pinned to @Order(1)). + // generations=true + a small sampling interval: pollWatchedTargets() does nothing without + // LivenessTracker::gcGenerationsEnabled(), and the small interval maximizes the chance the + // ChainLink instances allocated below actually get liveness-tracked. A large framecap avoids + // an early FRONTIER_CAP abandonment against this JVM's real, not-controlled-by-this-test + // root-reachable graph, and a long ttl avoids a TTL abandonment mid-test - either would call + // releaseSearchTags() and permanently zero every tag this test depends on. // - // pausetarget=5000: the pause-time pacing controller's updatePacing() (referenceChains.cpp) measures this JVM's real - // FollowReferences/GetObjectsWithTags call latency at ~150ms early on, climbing past a full - // second as this test's own allocation keeps handing the search more to discover (each pass - // re-scans the whole already-discovered/tagged set, so cost grows with cumulative progress, - // not with this test's own allocation *rate*) - i.e. that latency is dominated by per-call - // overhead, not by the requested edge budget. Against the default pausetarget=5ms ceiling - // (DEFAULT_REFERENCE_CHAINS_PAUSE_TARGET_MS, arguments.h) every observed pass is "over - // ceiling even at the floor", so the controller settles at MIN_EFFECTIVE_BUDGET=50 edges/pass - // and MAX_EFFECTIVE_CADENCE_NS=4s between passes - a real but glacial discovery rate this - // test's own wall-clock budget cannot outwait, and one a merely-generous ceiling (e.g. 500ms) - // only postpones: once cumulative progress pushes the real per-pass cost back past *that* - // ceiling too, the same throttling recurs. A ceiling comfortably above the highest per-call - // cost this test's own scale of population growth is expected to reach instead lets the - // controller keep _effective_budget at this test's own configured budget=4000 ceiling for - // the method's entire run, the same convergence behavior referenceChains_ut.cpp's own pacing - // tests already exercise synthetically. + // pausetarget=5000: the pacing controller measures this JVM's real FollowReferences call + // latency at ~150ms early on, climbing past a full second as this test's own allocation + // keeps handing the search more to discover (each pass re-scans the whole already-discovered + // set, so cost grows with cumulative progress, not with this test's allocation rate). Against + // the default 5ms ceiling every observed pass is "over ceiling even at the floor", so the + // controller settles at MIN_EFFECTIVE_BUDGET=50 edges/pass and 4s between passes - a real but + // glacial rate this test's wall-clock budget cannot outwait, and one a merely-generous + // ceiling (e.g. 500ms) only postpones: once cumulative progress pushes the real per-pass cost + // past *that* ceiling too, the same throttling recurs. A ceiling comfortably above the + // highest per-call cost this test's population growth is expected to reach lets the + // controller keep the configured budget=4000 for the whole run. // - // painbudget=100: shouldReconstructReferrerChainThroughUnboundedCacheLeak shares this - // singleton search with shouldReconstructReferrerChainToGcRoot (@Order(1), runs first) and - // needs a restart (canAffordNewSearch(), referenceChains.cpp) once that first search - // reaches a terminal state. PainBudget (painBudget.h) gates that restart on - // pain_spent_ms / refill_rate milliseconds of cooldown; the default - // DEFAULT_REFERENCE_CHAINS_PAIN_BUDGET_PERCENT=1 (1% refill) can make that cooldown run to - // tens of seconds to minutes for a search this large - far past this test's own bounded - // retry loop (16 rounds plus a short grace period). painbudget=100 keeps the restart gate - // affordable immediately, which is fine here since nothing else in this JVM is competing - // for the pain budget. + // painbudget=100: the cache-leak test shares this singleton search and needs a restart once + // the first search reaches a terminal state. PainBudget gates that restart on a cooldown of + // pain_spent_ms / refill_rate; the default 1% refill can stretch that to minutes for a + // search this large - far past this test's bounded retry loop. Nothing else in this JVM + // competes for the pain budget, so keep the gate affordable immediately. // - // firstpassbudget=200000: root/stack-ref enumeration (runPassManualWalk()'s - // IterateOverReachableObjects call) shares budget=4000 with expandFrontier()'s steady-state - // expansion unless overridden - in this shared, forked test JVM's real (not controlled by - // this test) root-reachable graph, that leaves this method's own CachedPayload-holding - // cache HashMap (a direct stack-local root on this test's own thread) at the mercy of - // whatever order JVMTI's enumeration happens to visit roots in: budget=4000 was observed - // exhausting itself on other roots' subtrees every single attempt, never once admitting a - // single edge from this thread's own stack. Overriding just root enumeration's own budget - // (not budget=4000, which the pacing controller has already been tuned around - raising it - // instead throttles every expansion pass down to - // MIN_EFFECTIVE_BUDGET/MAX_EFFECTIVE_CADENCE_NS, see updatePacing()) gives every root - // enumeration attempt (the first pass, and any later one ROOT_ENUM_MIN_INTERVAL_NS gates - // back in - see that constant's own comment) enough headroom to reach this thread's stack - // without slowing down the steady-state expansion passes that follow. - // memory=64:l:1.0 - the explicit 100% live-sample ratio is load-bearing: - // without a ratio segment the default is 10% (arguments.h's - // _live_samples_ratio) and LivenessTracker::track() drops 90% of - // tracked instances probabilistically, thinning the pool the - // representative-minting and candidate trend rings draw from - - // observed live as the intermittent "representative died/evicted" - // and zero-tag runs (see LeakTagCorrelationReferenceChainTest's own - // comment for the full lottery analysis). Total tracking volume is - // still capped by the 256KiB sampling-interval floor, not the ratio, - // so 100% keeps the tracking table tiny. + // firstpassbudget=200000: root/stack-ref enumeration shares budget=4000 with expandFrontier() + // unless overridden - and in this JVM's real root-reachable graph that left this method's own + // cache HashMap (a direct stack-local root) at the mercy of whatever order JVMTI enumerates + // roots in: budget=4000 was observed exhausting itself on other roots' subtrees every single + // attempt, never once admitting a single edge from this thread's own stack. Overriding just + // root enumeration's budget gives every enumeration attempt enough headroom to reach this + // thread's stack without slowing the steady-state expansion passes that follow. + // memory=64:l:1.0 - the explicit 100% live-sample ratio is load-bearing: without a ratio + // segment the default is 10% and LivenessTracker::track() drops 90% of tracked instances + // probabilistically, thinning the pool the representative-minting and candidate trend rings + // draw from - observed live as intermittent "representative died/evicted" and zero-tag runs. + // Total tracking volume is still capped by the 256KiB sampling-interval floor, not the + // ratio, so 100% keeps the tracking table tiny. return "memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=4000:ttl=120000:framecap=2000000:pausetarget=5000:painbudget=100:firstpassbudget=200000"; } - // shouldReportAbandonedSearchOnTinyFrontierCap needs the frontier table (not the - // per-pass budget) to be what runs out first: heapReferenceCallback() (referenceChains.cpp) - // checks the budget before ever calling FrontierTable::insert(), so a budget as small as - // the frontier cap itself (e.g. budget=1:framecap=1) only ever exhausts the budget after - // admitting exactly one object - insert() never gets a chance to fail, and the search - // completes normally instead of abandoning. A budget comfortably larger than framecap=1 - // lets a *second* root-referenced object reach insert() and hit the actually-full table, - // which is what runPass() treats as grounds to abandon (Termination section priority 1). + // shouldReportAbandonedSearchOnTinyFrontierCap needs the frontier table (not the per-pass + // budget) to run out first: heapReferenceCallback() checks the budget before ever calling + // FrontierTable::insert(), so a budget as small as the cap itself only exhausts the budget + // after admitting exactly one object - insert() never gets a chance to fail. A budget + // comfortably larger than framecap=1 lets a *second* root-referenced object reach insert() + // and hit the actually-full table, which is what runPass() treats as grounds to abandon. // - // framecap=1 only actually controls the table's capacity the *first* time - // ReferenceChainTracker::start() ever constructs its FrontierTable in this JVM - // (referenceChains.cpp's `if (_frontier == nullptr)` guard - the table, like - // LivenessTracker's own, survives every later start()/stop() cycle at whatever size it was - // first built with). This method's own @Order(1) pinning on - // shouldReconstructReferrerChainToGcRoot means *that* test's own, much larger framecap=2000000 - // wins that race instead - so this method also supplies a small ttl as a second, independent - // abandonment trigger. runPass()'s Termination-section priority still checks frontier-cap - // first, so a fresh, genuinely-tiny table (this method running first, e.g. in isolation via - // `-Ptests=ReferenceChainTrackingTest.shouldReportAbandonedSearchOnTinyFrontierCap`) still - // abandons via SearchAbandonReason::FRONTIER_CAP as originally designed; inheriting an - // already-oversized table instead falls through to the ttl check, which fires almost - // immediately regardless of table size because _search_start_ns (referenceChains.h) is set - // once, the first time the shared search ever started - by the time this method's own - // start() call re-parses ttl, that clock already reads however long - // shouldReconstructReferrerChainToGcRoot's own run took. Either path produces a - // datadog.ReferenceChainAbandoned event, which is all this method actually asserts on. + // framecap=1 only controls the table's capacity the *first* time start() constructs it in + // this JVM (the `if (_frontier == nullptr)` guard - the table survives every later start()/ + // stop() cycle at whatever size it was first built with). The @Order(1) test's much larger + // framecap=2000000 wins that race instead - so this command also supplies a small ttl as a + // second, independent abandonment trigger. A fresh, genuinely-tiny table (this method running + // first, e.g. in isolation) still abandons via FRONTIER_CAP; inheriting an already-oversized + // table falls through to the ttl check, which fires almost immediately regardless of table + // size because _search_start_ns is set once, the first time the shared search ever started. + // Either path produces a datadog.ReferenceChainAbandoned event, which is all this method + // asserts on. // - // painbudget=100, for the same reason shouldReconstructReferrerChainThroughUnboundedCacheLeak() - // above needs it (see that method's own comment on painbudget=100): this method's own - // resetReferenceChainSearchForTest0() call spends whatever _search_pain_ms - // shouldReconstructReferrerChainThroughUnboundedCacheLeak()'s own long-running search left - // behind (found the hard way - that search runs 20+ passes admitting tens of thousands of - // edges each, and nothing zeroes _search_pain_ms between its own end and this method's start() - // reconstructing a fresh, zero-balance PainBudget) into *this* method's own PainBudget - // (referenceChains.cpp's restartSearch()/resetSearchStateForTest(), both call - // _pain_budget.spend(_search_pain_ms) unconditionally) - at the default 1% refill rate, - // draining that debt back to canStartNow()==true would take on the order of minutes, far past - // this method's own retry budget below. painbudget=100 keeps that gate affordable immediately, - // the same way it does for the sibling method. + // painbudget=100: this method's own resetReferenceChainSearchForTest0() spends whatever + // _search_pain_ms the earlier long-running search left behind into *this* method's PainBudget + // (restartSearch()/resetSearchStateForTest() both call _pain_budget.spend(_search_pain_ms) + // unconditionally) - at the default 1% refill, draining that debt would take minutes. if ("shouldReportAbandonedSearchOnTinyFrontierCap".equals(testName)) { return "referencechains=true:hops=32:budget=500:framecap=1:ttl=100:painbudget=100"; } - // Deliberately does not request cpu/wall/memory/nativemem: those categories also - // write an "enabled" ActiveSetting (flightRecorder.cpp:1141-1144) and all default to - // false when not requested, so "enabled"="true" is unambiguous evidence of the - // datadog.ReferenceChain setting specifically without needing to disambiguate by the - // ActiveSetting "id" field (JMC's generic accessor lookup does not resolve that field - // for this custom event type - not worth a bespoke accessor for one assertion). + // Deliberately does not request cpu/wall/memory/nativemem: those categories also write an + // "enabled" ActiveSetting, so "enabled"="true" is unambiguous evidence of the + // datadog.ReferenceChain setting without needing to disambiguate by the "id" field (JMC's + // generic accessor lookup does not resolve that field for this custom event type - not worth + // a bespoke accessor for one assertion). return "referencechains=true:hops=32:budget=500:ttl=2000:framecap=256"; } @@ -304,85 +224,65 @@ public void shouldExposeReferenceChainsSettingWhenEnabled() { } /** - * This test's stated success-path scenario, now exercising the Remaining Work Plan's - * target-selection bridging feed instead of staying disabled: allocates a growing population of - * {@link ChainLink} instances, forcing GCs between allocation rounds so - * {@code LivenessTracker::cleanup_table()}'s epoch-advance pass (livenessTracker.cpp) observes a - * rising per-klass survivor count each time, until {@code selectLeakCandidates()} trusts the - * resulting trend (needs {@code KLASS_POPULATION_MIN_FILL_FOR_TREND = 10} ring-buffer samples). - * Then waits for {@code ReferenceChainTracker::pollWatchedTargets()} to notice that ranked - * candidate has already been tagged by an ordinary {@code runPass()} walk and reconstruct + - * emit its chain, and asserts on the resulting {@code datadog.ReferenceChain} event. + * Allocates a growing population of {@link ChainLink} instances, forcing GCs between rounds so + * LivenessTracker observes a rising per-klass survivor count each time, until + * {@code selectLeakCandidates()} trusts the trend - then waits for {@code pollWatchedTargets()} + * to notice that candidate has already been tagged by an ordinary walk and reconstruct + emit + * its chain, asserting on the resulting {@code datadog.ReferenceChain} event. * - *

      Each population-growth round pairs with an explicit {@link #dump(Path)}: per - * livenessTracker.cpp, {@code cleanup_table()}'s per-klass population accounting only runs - * (unforced) from {@code flush_table()}, which only runs from {@code LivenessTracker::flush()}, - * which is called *only* from {@code Profiler::dump()} - there is no timer-driven flush. - * {@code System.gc()} bumps {@code LivenessTracker::_gc_epoch} synchronously inside the - * {@code GarbageCollectionFinish} callback ({@code onGC()}), so by the time {@code System.gc()} - * returns to Java the epoch bump is already visible - no extra sleep is needed between the - * {@code gc()} and the {@code dump()} that observes it. + *

      Each round pairs with an explicit {@link #dump(Path)}: LivenessTracker's per-klass + * population accounting only runs (unforced) from {@code flush_table()}, which only runs from + * {@code LivenessTracker::flush()}, called *only* from {@code Profiler::dump()} - there is no + * timer-driven flush. {@code System.gc()} bumps the GC epoch synchronously inside the + * {@code GarbageCollectionFinish} callback, so it is already visible by the time {@code gc()} + * returns - no sleep needed between the gc() and the dump() that observes it. */ @Test @Order(1) public void shouldReconstructReferrerChainToGcRoot() throws Exception { + // Per-run unique path, not a fixed name in the CWD: parallel workers or a shared checkout can + // never read each other's recording, and an aborted run leaves nothing a later run inherits. + // Created first - before any static holder, reset, or allocator thread - so an IOException here + // leaks nothing; the placeholder is deleted so dump() creates the file itself. + Path scratchDumpPath = Files.createTempFile("referencechains-population-scratch-", ".jfr"); + Files.deleteIfExists(scratchDumpPath); // Seed gcRootHolder with one live element *before* resetting the search below: ArrayList's - // backing array starts out as the shared empty-array sentinel, and only gets replaced with a - // real array on its first grow() (addAll()). ReferenceChainTracker::expandFrontier() - // (referenceChains.cpp) freezes whatever children it observes for a node the moment that - // node is expanded - it never re-examines an already-EXPANDED node for a later field mutation, - // regardless of how many times root/stack-ref enumeration itself reruns over the search's - // lifetime (runPassManualWalk()'s own comment). If gcRootHolder's node gets expanded while - // elementData still pointed at the empty sentinel (nothing stops some *unrelated* GC in this - // shared, no-forkEvery JVM from waking the freshly (re)started BFS thread in the gap between - // resetting the search below and round 1's own addAll()), the frozen children set would be - // permanently empty, and no ChainLink added in any of the 16 rounds that follow would ever + // backing array starts as the shared empty-array sentinel and is only replaced on its first + // grow(). expandFrontier() freezes whatever children it observes for a node the moment that + // node is expanded - it never re-examines an already-EXPANDED node. If gcRootHolder's node + // gets expanded while elementData still points at the empty sentinel (some unrelated GC can + // wake the freshly restarted BFS thread in the gap between the reset and round 1's addAll()), + // the frozen children set would be permanently empty and no ChainLink added later would ever // become reachable - matching a real CI failure where pollWatchedTargets() reported tag=0 for - // this klass on every single poll across the whole test. Seeding one element first means the - // backing array is never empty at any point after the search (re)starts: every later - // addAll()/grow() copies all prior elements (including this one) into the new array, so - // whichever array the walk happens to snapshot when it expands the node, index 0 is always - // present in it. + // this klass on every poll. Seeding one element first means the backing array is never empty + // after the search (re)starts: every later grow() copies all prior elements into the new + // array, so index 0 is always present in whichever array the walk snapshots. gcRootHolder = new ArrayList<>(); gcRootHolder.add(new ChainLink("gc-root-seed")); if ("debug".equals(System.getProperty("ddprof_test.config"))) { - // Being pinned to run first *within this class* (this class's own header comment, "Why - // @TestMethodOrder/@Order(1)") does not guarantee this is the first reference-chain test - // to ever call into the shared, process-wide singleton ReferenceChainTracker in this whole - // test JVM - no forkEvery is configured (same header comment), so another test class can - // run first and leave the singleton search already non-RUNNING/already-tagged, in which - // case runPass() never takes its real root-seeded-walk branch again. Force a genuine fresh - // search so this test's own ChainLink population is guaranteed reachable by a real walk, - // regardless of what ran earlier in this JVM. Debug-only: this native seam does not exist - // in a release build. + // Being pinned first within this class does not make this the first reference-chain test in + // the whole shared JVM - another test class can run first and leave the singleton search + // already non-RUNNING/already-tagged, in which case runPass() never takes its real + // root-seeded-walk branch again. Force a genuine fresh search so this test's ChainLink + // population is guaranteed reachable by a real walk. Debug-only: the seam does not exist in + // a release build. // - // resetKlassPopulationForTest0() first, for the same "no forkEvery" reason: - // LivenessTracker's _klass_population table (livenessTracker.cpp) also survives stop()/ - // start() cycles, so an unrelated earlier test class in this same shared JVM (e.g. another - // generations=true scenario) could leave a klass already past hasLeakSignal()'s - // consecutive_positive hysteresis gate (selectLeakCandidates(), livenessTracker.cpp) - // sitting in that table - which would let this test's first pass start for a reason that - // has nothing to do with the seeding this method does further down (see - // SEED_EPOCHS_FOR_HYSTERESIS's own comment), masking whether that seeding is actually - // sufficient on its own. + // resetKlassPopulationForTest0() first: LivenessTracker's _klass_population table survives + // stop()/start() cycles, so an earlier test class could leave a klass already past the + // consecutive_positive hysteresis gate sitting in that table - letting this test's first + // pass start for a reason unrelated to the seeding below, masking whether that seeding is + // actually sufficient on its own. ReferenceChainTestHooks.resetKlassPopulationForTest0(); ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); } - // One persistent allocator thread, reused by every round - NOT a fresh - // spawned thread per round. Same JVMTI property the per-round spawn - // relied on (SampledObjectAlloc never fires for this JUnit worker - // thread's own allocations, but reliably fires for threads created - // after Profiler::start() already ran), plus the decisive per-tid - // consequence: LivenessTracker's per-(klass, tid) qualification trend - // accumulates REAL samples for this one thread's tid every round - // (foldKlassCountsLocked() folds each tracked instance's tid), so - // qualification is organic and cannot age out mid-test. The previous - // per-round spawns gave every round a DIFFERENT short-lived tid, so - // the seeded (klass, worker-tid) qualification ramp was the only - // qualifying signal - and once its ring slots aged out (observed - // live: slope decayed to ~0 at ring_fill=22, consecutive_positive - // reset, the candidate never returned again) the candidate dropped - // out of selectLeakCandidates() with the whole crawl still unfinished. + // One persistent allocator thread, reused by every round - NOT a fresh thread per round. + // SampledObjectAlloc never fires for this JUnit worker thread's own allocations, but + // reliably fires for threads created after Profiler::start() already ran; and per-tid, the + // per-(klass, tid) qualification trend accumulates REAL samples for this one thread's tid + // every round, so qualification is organic and cannot age out mid-test. Per-round spawns + // gave every round a different short-lived tid, so the seeded ramp was the only qualifying + // signal - and once its ring slots aged out the candidate dropped out of + // selectLeakCandidates() with the whole crawl still unfinished. LinkedBlockingQueue allocRequests = new LinkedBlockingQueue<>(); Semaphore roundDone = new Semaphore(0); AtomicLong allocatorTid = new AtomicLong(-1); @@ -406,48 +306,35 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { }, "togcroot-leak-allocator"); allocator.start(); - Path scratchDumpPath = Paths.get("referencechains-population-scratch.jfr"); try { // The seeding block below needs the allocator's tid. Bounded and inside this try so a // dead/stuck allocator fails the test (and is still shut down by the finally) instead of // hanging the shared fork. awaitAllocatorTid(allocator, allocatorTid, allocatorFailure); - // Up to 16 rounds: selectLeakCandidates()'s KLASS_POPULATION_MIN_FILL_FOR_TREND = 10 - // (livenessTracker.h) needs 10 *epochs that actually observe a surviving ChainLink sample*, - // not just 10 dump() calls - allocation sampling is probabilistic (see below), so some - // early, smaller rounds may not land a single ChainLink sample. Growing the per-round count - // compensates, and this loop keeps going (checking for the event every round) rather than - // committing to a fixed round count up front, so it self-adjusts to whatever this JVM's - // actual sampling behavior turns out to be. Staying under KLASS_POPULATION_RING_SIZE = 30 - // keeps every round's sample within the trend computeKlassPopulationSlope() reads back out. - // Capped at 16 rather than a larger margin above the 10-round minimum: this loop's own - // worst case (every round retained, no early match) runs inside the same forked test JVM - // every other ddprof-test class shares (ProfilerTestPlugin.kt's shared -Xmx512m default, - // no forkEvery) - a prior CI run hit "Java heap space" in that shared fork with this loop - // capped at 25, so the cap trades some of the original margin above the 10-round minimum - // for staying inside that shared heap. + // Up to 16 rounds: KLASS_POPULATION_MIN_FILL_FOR_TREND = 10 needs 10 *epochs that actually + // observe a surviving ChainLink sample*, not just 10 dump() calls - allocation sampling is + // probabilistic, so some early, smaller rounds may not land a single ChainLink sample. + // Growing the per-round count compensates, and the loop keeps going (checking for the event + // every round) rather than committing to a fixed round count. Staying under + // KLASS_POPULATION_RING_SIZE = 30 keeps every round's sample within the trend window. + // Capped at 16 rather than a larger margin: this loop's worst case runs inside the shared + // forked test JVM every other ddprof-test class shares (-Xmx512m, no forkEvery) - a prior + // CI run hit "Java heap space" with the cap at 25. // - // Per-round size growth itself is clamped to round 10 (Math.min(round, 10) below): rounds - // past 10 exist only to give pollWatchedTargets() more retries against the lock-contention - // race described below, not to keep building the population trend (already eligible by - // round 10) - letting round*600 keep scaling unclamped through round 16 made rounds 11-16 - // each add strictly more retained garbage than the last for no trend benefit, which is what - // drove the "Java heap space" failure this comment's own history refers to. + // Per-round growth is clamped to round 10: rounds past 10 exist only to give + // pollWatchedTargets() more retries against the lock-contention race below, not to keep + // building the population trend (already eligible by round 10) - unclamped rounds 11-16 + // each add strictly more retained garbage for no trend benefit. // - // Instance count is sized against ObjectSampler::check() (objectSampler.cpp), not this - // test's own "memory=64" request: "do not allow shorter interval than 256KiB" means the - // *actual* allocation-sampling interval is 262144 bytes regardless of the small value - // requested above (that request only affects LivenessTracker's own table-capacity formula, - // livenessTracker.cpp's initialize_table()). ChainLink's own padding fields (see that - // class's comment) get enough total megabytes sampled from far fewer instances than plain, - // unpadded ~40-byte instances would need - keeping this test's own contribution to the real - // JVM's root-reachable graph (which ReferenceChainTracker's BFS walk must also traverse, - // Triggering section) from ballooning to the point the walk can't practically catch up - // within this test's own wall-clock budget. ChainLink competes on equal footing against - // other incidental klasses (e.g. "[B"/byte[]) that this same mechanism may also legitimately - // flag as leak candidates - this test's own assertions below look for ChainLink specifically - // among however many datadog.ReferenceChain events actually appear, rather than assuming it - // is the only one. + // Instance count is sized against ObjectSampler::check(), not this test's "memory=64" + // request: the *actual* sampling interval is 256KiB regardless of the small value requested + // (that request only affects LivenessTracker's table-capacity formula). ChainLink's padding + // fields get enough megabytes sampled from far fewer instances than plain ~40-byte + // instances would need - keeping this test's contribution to the root-reachable graph (which + // the BFS walk must also traverse) from ballooning past the walk's wall-clock budget. + // ChainLink competes on equal footing against incidental klasses (e.g. byte[]) this same + // mechanism may also flag - the assertions below look for ChainLink among however many + // events actually appear, rather than assuming it is the only one. ReferenceChainAssertions.JfrChainMatch match = null; boolean seededTestKlassTrend = false; int totalRounds = 16; @@ -466,64 +353,42 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { match = ReferenceChainAssertions.findMatchForClass(verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false), ChainLink.class); if (match == null && "debug".equals(System.getProperty("ddprof_test.config"))) { - // Debug-only native seams - a no-op in release builds, so this leaves release-build - // coverage of the organic path below completely unchanged. + // Debug-only native seams - a no-op in release builds, so release-build coverage of the + // organic path below is unchanged. // - // Seeding a klass_id's population ring here is not just a ranking shortcut for an - // object some other pass has already tagged - with generations=true, - // ReferenceChainTracker::shouldRunPass() (referenceChains.cpp) gates even this search's - // very first pass on LivenessTracker::hasLeakSignal(), which (once secondsToOOM() has - // nothing to report yet, this early) falls through to selectLeakCandidates() requiring - // consecutive_positive >= LEAK_TREND_HYSTERESIS_BASE for *some* klass, real or not (see - // SEED_EPOCHS_FOR_HYSTERESIS's own comment for why 10 seeded epochs alone cannot clear - // that bar). Seeding SEED_EPOCHS_FOR_HYSTERESIS epochs for this test-chosen id clears it - // outright, which is what actually authorizes the background BFS thread's next - // scheduled wake to run its real, root-seeded runPass() walk - nothing before that point - // has tagged gcRootHolder's own ChainLink yet. pollReferenceChainTargets0() right below - // is therefore best-effort, not guaranteed on this call: it only reconstructs a chain - // once getTag() on the representative is actually > 0 (pollWatchedTargets()'s only - // precondition), which needs that background pass to have already run. The retry loop - // below (a 300ms-sleep-then-dump fallback, repeated across rounds) gives the - // now-unblocked background thread room to do that and have its own post-pass - // pollWatchedTargets() call (threadLoop(), referenceChains.cpp) pick the chain up on its - // own, independent of this method's own poll call succeeding on the first try. + // With generations=true, shouldRunPass() gates even the search's very first pass on + // hasLeakSignal(), which falls through to selectLeakCandidates() requiring + // consecutive_positive >= LEAK_TREND_HYSTERESIS_BASE for *some* klass (see + // SEED_EPOCHS_FOR_HYSTERESIS's comment for why 10 seeded epochs alone cannot clear that + // bar). Seeding SEED_EPOCHS_FOR_HYSTERESIS epochs clears it outright, which is what + // authorizes the background BFS thread's next scheduled wake to run its real pass - + // nothing before that point has tagged gcRootHolder's own ChainLink yet. The explicit + // pollReferenceChainTargets0() right below is therefore best-effort: it only reconstructs + // a chain once the representative's getTag() is actually > 0, which needs that background + // pass to have already run. The retry loop below (sleep-then-dump fallback, repeated + // across rounds) gives the now-unblocked background thread room to do that and have its + // own post-pass poll pick the chain up on its own. // - // Seed exactly once (recordKlassPopulationSampleLocked(), livenessTracker.cpp, always - // *appends* a fresh ring slot rather than overwriting one for a repeated epoch - calling - // this whole block again on a later round would append a second ramp right after the - // first, turning the ring into a non-monotonic sawtooth and destroying the very - // positive-slope signal selectLeakCandidates() needs). Only the poll+dump recheck below - // needs to repeat across rounds - not the seeding - to give the background pass, or a - // lock-contended dump(), more rounds to resolve. - // Representative BEFORE seeding: setKlassPopulationRepresentativeForTest0 - // resolves the representative's real klass id and aliases the synthetic - // id to it, so the hysteresis seeds below land in the real population - // entry (candidate matching is real-id keyed since the leak-tag pool - // redesign; seeds under a bare synthetic id authorize only - // hasLeakSignal()'s candidate-count check and match nothing else). + // Seed exactly once: recordKlassPopulationSampleLocked() always *appends* a fresh ring + // slot rather than overwriting one for a repeated epoch - reseeding on a later round + // would append a second ramp right after the first, turning the ring into a non-monotonic + // sawtooth and destroying the positive-slope signal. Only the poll+dump recheck below + // needs to repeat across rounds. + // Representative BEFORE seeding: setKlassPopulationRepresentativeForTest0 resolves the + // representative's real klass id and aliases the synthetic id to it, so the seeds below + // land in the real population entry (candidate matching is real-id keyed since the + // leak-tag pool redesign). ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( CHAIN_LINK_TEST_KLASS_ID, gcRootHolder.get(0)); if (!seededTestKlassTrend) { - // Per-(klass, tid) qualification seeds - the persistent allocator - // thread owns every ChainLink allocation, so ITS tid is the - // qualifying one; the seeds accelerate the organic per-tid growth - // its own tracked instances produce every round (see the - // allocator block's own comment for why qualification aging out - // stranded the crawl before this thread existed). + // The persistent allocator thread owns every ChainLink allocation, so ITS tid is the + // qualifying one. Seed counts scale as the organic ramp itself (+1 per epoch), NOT + // some inflated multiple: hasQualifyingGrowth() takes the difference of third-window + // means over the whole seed+real series, and seeds of epoch*10 dwarfing the real + // ~1..15 counts made the slope go NEGATIVE (-20..-40 observed live, the "transition + // cliff") the moment real samples displaced the seeded tail. With matched-scale seeds + // every third-window pairing across the transition still yields a positive slope. int leakTid = (int) allocatorTid.get(); - // Seed counts scale as the organic ramp itself (+1 per epoch), - // NOT some inflated multiple: the ring is one continuous series - // of seeds followed by the real folds, and hasQualifyingGrowth() - // takes the difference of third-window MEANS over that whole - // series. Seeds of epoch*10 (10..150) dwarf the real generation - // counts (the real ramp is +1 per epoch, ~1..15 by test end), so - // the moment real samples displace the seeded tail the slope - // went NEGATIVE (-20..-40 observed live: the "transition cliff") - // and the candidate never returned again. With matched-scale - // seeds the series is [1..15, 1, 2, 3, ...] and every third- - // window pairing across the transition still yields a positive - // slope - the candidate keeps qualifying organically the whole - // run, the real signal seamlessly taking over from the seeds. for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0( CHAIN_LINK_TEST_KLASS_ID, epoch, epoch); @@ -538,25 +403,21 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { } if (match == null) { - // A quiet window with no dump() in flight: Profiler::dump() (profiler.cpp) holds every - // entry of _locks[] exclusively for the duration of its own _jfr.dump() call - // (rotateDictsAndRun()'s lockAll()/unlockAll() pair) - the same array - // Profiler::writeReferenceChain() (profiler.cpp) needs a slot from to record an event at - // all. Back-to-back rounds with essentially no gap between one dump() and the next leave - // pollWatchedTargets() (referenceChains.cpp) little to no window to ever win that race; - // sleeping briefly here, then dumping again with no intervening dump()/gc() in between - // (so cleanup_table()'s epoch-advance pass, livenessTracker.cpp, stays a no-op and the - // population trend built up so far is undisturbed), gives it one. + // A quiet window with no dump() in flight: Profiler::dump() holds every entry of _locks[] + // exclusively for its own _jfr.dump() call - the same array writeReferenceChain() needs a + // slot from. Back-to-back rounds leave pollWatchedTargets() little to no window to win + // that race; sleeping briefly here, then dumping again with no intervening gc() (so + // cleanup_table()'s epoch-advance pass stays a no-op and the population trend is + // undisturbed), gives it one. Thread.sleep(300); dump(scratchDumpPath); match = ReferenceChainAssertions.findMatchForClass(verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false), ChainLink.class); } } - // Grace period: the population trend only became eligible (ring_fill >= 10) partway through - // the loop above, and the same lock contention the loop's own comment describes can still - // delay the resulting write past this method's very last dump() - retry a few more times, - // well past that contention window, before concluding the mechanism genuinely did not fire. + // Grace period: the trend only became eligible (ring_fill >= 10) partway through the loop + // above, and the same lock contention can still delay the write past this method's last + // dump() - retry a few more times before concluding the mechanism genuinely did not fire. for (int attempt = 0; match == null && attempt < 5; attempt++) { Thread.sleep(1000); dump(scratchDumpPath); @@ -567,18 +428,13 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { "Never observed a datadog.ReferenceChain event whose chain[0] is " + ChainLink.class + " after " + gcRootHolder.size() + " retained ChainLink instances across up to " + totalRounds + " population-growth rounds plus a grace period"); - // chain[0] is the *target* object's own class, not its holder's: - // ReferenceChainTracker::buildChainEvent()'s reconstructChain() (referenceChains.h) - // appends each visited FrontierEntry's referrer_klass leaf-to-root, and referrer_klass is - // populated from the *discovered object's own* GetClassSignature at insertion time (see - // referenceChainJfrRoundtrip_ut.cpp's insert(tag, parent_tag, referrer_klass, depth) calls, - // where tag 3's own referrer_klass is leafKlass, not middleKlass). The target here is - // always some currently-live ChainLink instance - the only class this test's leak-candidate - // population trend was built from - regardless of exactly which of the many instances - // allocated above LivenessTracker::foldKlassCountsLocked() (livenessTracker.cpp) happened to - // keep as its representative. Everything above chain[0] reflects real JDK-internal - // collection representation (e.g. ArrayList's backing array) rather than anything this test - // controls, so it is deliberately not asserted beyond "at least one hop was reconstructed". + // chain[0] is the *target* object's own class, not its holder's: reconstructChain() appends + // each visited FrontierEntry's referrer_klass leaf-to-root, and referrer_klass is populated + // from the *discovered object's own* GetClassSignature at insertion time. The target here is + // always some currently-live ChainLink instance - the only class the leak-candidate trend + // was built from - regardless of which instance the representative happens to be. Everything + // above chain[0] reflects real JDK-internal collection representation rather than anything + // this test controls, so it is deliberately not asserted beyond "at least one hop". assertEquals(ChainLink.class.getName(), match.chain.get(0)); assertTrue(match.targetTag > 0, "targetTag should be a valid, non-zero JVMTI tag"); assertTrue(match.depth >= 0, "depth should be a non-negative hop count"); @@ -596,68 +452,44 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { } /** - * A second, independent end-to-end scenario for the same target-selection mechanism as - * {@link #shouldReconstructReferrerChainToGcRoot()}, using a shape much closer to a real-world - * leak than that method's hand-rolled {@link ChainLink} list: an ever-growing, never-evicted - * {@link java.util.HashMap}-backed cache - a very common real leak pattern - holding - * {@link CachedPayload} values. Beyond confirming a chain fires for the leaking value type, - * this also asserts the reconstructed chain actually threads back through - * {@code java.util.HashMap}'s own internal storage ({@code HashMap$Node}), i.e. that the - * mechanism correctly walks a real JDK collection's internals rather than only ever having - * been proven against a single purpose-built linked fixture. + * A second, independent end-to-end scenario for the same target-selection mechanism, using a + * shape much closer to a real-world leak than {@link ChainLink}'s hand-rolled list: an + * ever-growing, never-evicted {@link java.util.HashMap}-backed cache holding + * {@link CachedPayload} values. Also asserts the reconstructed chain actually threads back + * through {@code java.util.HashMap}'s own internal storage ({@code HashMap$Node}) - that the + * mechanism correctly walks a real JDK collection's internals, not only purpose-built fixtures. * - *

      Why {@code cache} is a local variable, not a {@code static} field (found the hard - * way): {@code ReferenceChainTracker::expandFrontier()} (referenceChains.cpp) freezes - * whatever children it observes for a node the moment that node is expanded - it never - * re-examines an already-{@code EXPANDED} entry for newly-added children, regardless of how - * many times root/stack-ref enumeration itself reruns over the search's lifetime - * ({@code runPassManualWalk()}'s own comment). A {@code static} field becomes a root at - * class-load time, essentially guaranteeing some early pass catches it (and marks it - * {@code EXPANDED}) while still empty - permanently blocking discovery of anything added to it - * afterward, no matter how many rounds run. A local variable created fresh at the top of this + *

      Why {@code cache} is a local variable, not a {@code static} field: + * {@code expandFrontier()} freezes whatever children it observes for a node the moment that node + * is expanded - it never re-examines an already-{@code EXPANDED} entry for newly-added children. + * A {@code static} field becomes a root at class-load time, essentially guaranteeing some early + * pass catches it (and marks it {@code EXPANDED}) while still empty - permanently blocking + * discovery of anything added afterward. A local variable created fresh at the top of this * method, immediately followed by round-1 allocation, gives root enumeration a real chance to - * catch it only after it already holds live data - mirroring - * {@link #shouldReconstructReferrerChainToGcRoot()}'s {@code gcRootHolder}, which works for - * exactly this reason (a local {@code ArrayList}, not a {@code static} one). - * - *

      See this class's own header comment for why this runs as {@code @Order(2)}, before - * {@link #shouldReportAbandonedSearchOnTinyFrontierCap()}, and for why its relative order - * against {@link #shouldReconstructReferrerChainToGcRoot()} does not itself matter. + * catch it only after it already holds live data. */ @Test @Order(2) public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exception { - // Seed cache with one live entry *before* the resets below, mirroring - // shouldReconstructReferrerChainToGcRoot()'s own gcRootHolder seeding (see that method's - // comment): HashMap's backing table also starts out as a shared, lazily-replaced empty - // sentinel (only allocated on the first put()), so the same one-shot-BFS-freeze hazard - // documented there - a concurrent GC-triggered walk expanding this node's children while the - // backing table is still the empty sentinel, permanently freezing an empty children set - - // applies here too. Seeding one entry first means the backing table is never empty at any - // point after the search (re)starts. + // Seed cache with one live entry *before* the resets below: HashMap's backing table also + // starts as a shared, lazily-replaced empty sentinel (allocated on the first put()), so the + // same one-shot-BFS-freeze hazard documented in shouldReconstructReferrerChainToGcRoot() + // applies here too. Map cache = new HashMap<>(); cache.put("cache-leak-seed", new CachedPayload("cache-leak-seed")); if ("debug".equals(System.getProperty("ddprof_test.config"))) { - // Mirrors shouldReconstructReferrerChainToGcRoot()'s own reset (see that method's comment): - // the natural restartSearch() cycle (shouldRunPass(), referenceChains.cpp) that would - // otherwise give this method its own fresh root walk once shouldReconstructReferrerChainToGcRoot()'s - // own ChainLink candidate is found and its tags released is gated on cadence/pacing budget - // (canAffordNewSearch()) - not guaranteed to fire again before this method's own round/retry - // budget runs out. Force a genuine fresh search here too, rather than depend on that timing, - // so cache (below) is guaranteed reachable by a real walk regardless of it. Debug-only: this - // native seam does not exist in a release build. + // Force a genuine fresh search rather than depend on the natural restartSearch() cycle being + // gated on cadence/pacing budget (canAffordNewSearch()) firing again within this method's + // retry budget. // - // resetReferenceChainSearchForTest0() only resets ReferenceChainTracker's own search state - // (frontier/tags/search-progress fields); it does not touch LivenessTracker's per-klass - // population-history rings, which selectLeakCandidates() consults independently to decide - // which klass is "trending". Without also resetting those, a klass ChainLink already - // accumulated a positive slope for during shouldReconstructReferrerChainToGcRoot() can still - // outrank CachedPayload as the leak candidate here, so the fresh search below ends up - // reconstructing ChainLink's chain again instead of CachedPayload's. + // resetKlassPopulationForTest0() too: without it, a klass ChainLink already accumulated a + // positive slope for during the @Order(1) test can still outrank CachedPayload as the leak + // candidate here, and the fresh search ends up reconstructing ChainLink's chain again. ReferenceChainTestHooks.resetKlassPopulationForTest0(); ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); } - Path scratchDumpPath = Paths.get("referencechains-cache-leak-scratch.jfr"); + Path scratchDumpPath = Files.createTempFile("referencechains-cache-leak-scratch-", ".jfr"); + Files.deleteIfExists(scratchDumpPath); Thread allocator = null; try { // Same round-growth/retry shape as shouldReconstructReferrerChainToGcRoot() - see that @@ -670,16 +502,12 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc boolean seededTestKlassTrend = false; int totalRounds = 16; - // Pre-generate every key this loop will ever need, up front, rather than concatenating a - // fresh String on every put() below. CachedPayload's own class comment already documents - // why this fixture uses plain long fields instead of a byte[] (an earlier version's byte[] - // field stole every allocation-sampling hit from CachedPayload itself) - the key String - // (plus its own backing byte[]) is the same kind of same-instant, size-weighted-sampler - // competitor, just a *separate* object instead of a field. Generating all keys in one - // batch before the round loop starts lets their own klass_population trend flatten out - // (selectLeakCandidates() needs KLASS_POPULATION_MIN_FILL_FOR_TREND=10 *new* samples, not - // just a nonzero ring) well before CachedPayload's own ring starts growing, so the sampler - // has nothing else in flight to compete with once round 1 begins. + // Pre-generate every key up front rather than concatenating a fresh String on every put(). + // The key String (plus its backing byte[]) is the same kind of same-instant, + // size-weighted-sampler competitor as the byte[] field CachedPayload's comment mentions - + // just a separate object. Generating all keys before the round loop lets their own + // klass_population trend flatten out well before CachedPayload's ring starts growing, so + // the sampler has nothing else in flight to compete with once round 1 begins. int maxEntries = 0; for (int round = 1; round <= totalRounds; round++) { maxEntries += Math.min(round, 10) * 600; @@ -689,15 +517,12 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc keys[i] = "leak-" + i; } - // One persistent allocator thread for every round - same shape and rationale as - // shouldReconstructReferrerChainToGcRoot()'s allocator (see its comment): created after - // Profiler::start() so SampledObjectAlloc fires for its allocations, and - decisively - - // every CachedPayload (including the keys[0] representative set below) carries THIS - // thread's profiler tid, which is the tid the per-(klass, tid) seeds must name: - // tagLeakInstances() only tags instances allocated by a qualifying tid. Only this thread - // mutates cache, and only between a request's take() and its roundDone.release(); the - // main thread reads cache only after awaitAllocatorRound() returns (happens-before via - // the queue and the semaphore). + // One persistent allocator thread for every round - same shape and rationale as the gc-root + // test's allocator. Decisively, every CachedPayload (including the keys[0] representative + // set below) carries THIS thread's profiler tid, which is the tid the per-(klass, tid) + // seeds must name: tagLeakInstances() only tags instances allocated by a qualifying tid. + // Only this thread mutates cache, and only between a request's take() and its + // roundDone.release(); the main thread reads cache only after awaitAllocatorRound() returns. LinkedBlockingQueue allocRequests = new LinkedBlockingQueue<>(); Semaphore roundDone = new Semaphore(0); AtomicLong allocatorTid = new AtomicLong(-1); @@ -724,12 +549,10 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc awaitAllocatorTid(allocator, allocatorTid, allocatorFailure); for (int round = 1; round <= totalRounds && match == null; round++) { - // Matches shouldReconstructReferrerChainToGcRoot()'s own *600 growth rate (not *300, this - // method's previous value) - CachedPayload and ChainLink are near-identical in size (same - // padding fields; CachedPayload is actually slightly smaller, missing ChainLink's `next` - // reference), so halving the growth rate here bought no headroom and instead just let - // CachedPayload's own population ring stall short of KLASS_POPULATION_MIN_FILL_FOR_TREND - // within the same totalRounds budget both methods share. + // Same *600 growth rate as the gc-root test (not *300, this method's previous value): + // CachedPayload and ChainLink are near-identical in size, so halving the growth rate here + // bought no headroom and just let CachedPayload's population ring stall short of + // KLASS_POPULATION_MIN_FILL_FOR_TREND within the same totalRounds budget. int newEntries = Math.min(round, 10) * 600; if (!allocRequests.offer(newEntries)) { throw new IllegalStateException("allocRequests queue rejected entry count " + newEntries); @@ -741,24 +564,16 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc match = ReferenceChainAssertions.findMatchForClass(events1, CachedPayload.class); if (match == null && "debug".equals(System.getProperty("ddprof_test.config"))) { - // Same deterministic short-circuit as shouldReconstructReferrerChainToGcRoot() - see - // that method's own comment for the full mechanism (why seeding - // SEED_EPOCHS_FOR_HYSTERESIS epochs is what actually authorizes the background BFS - // thread's next real pass, and why this method's own pollReferenceChainTargets0() call - // right below is therefore best-effort rather than something the seed alone - // guarantees on this call). Seed exactly once - see that method's own comment for why - // reseeding the same ramp on a later round would corrupt the ring into a non-monotonic - // sawtooth and destroy the positive-slope signal instead of just re-establishing it. - // Representative BEFORE seeding - same real-id aliasing rationale as - // shouldReconstructReferrerChainToGcRoot()'s own comment above. + // Same deterministic short-circuit as the gc-root test: the seed is what authorizes the + // background BFS thread's next real pass, so the explicit poll below is best-effort; + // and seed exactly once, since reseeding would corrupt the ring into a non-monotonic + // sawtooth. Representative BEFORE seeding - same real-id aliasing rationale. ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( CACHED_PAYLOAD_TEST_KLASS_ID, cache.get(keys[0])); if (!seededTestKlassTrend) { - // Per-(klass, tid) qualification seeds name the persistent allocator - // thread's tid: it allocated every CachedPayload, including the keys[0] - // representative, so it is the only tid whose tracked instances - // tagLeakInstances() can tag - NOT this JUnit worker's tid, which - // allocated none of them. + // The seeds name the allocator thread's tid: it allocated every CachedPayload, + // including the keys[0] representative - NOT this JUnit worker's tid, which allocated + // none of them. int leakTid = (int) allocatorTid.get(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0( @@ -800,9 +615,9 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc assertTrue(match.targetTag > 0, "targetTag should be a valid, non-zero JVMTI tag"); assertTrue(match.depth >= 0, "depth should be a non-negative hop count"); - // The point of this test over shouldReconstructReferrerChainToGcRoot(): confirm the walk - // actually passed through the cache's own internal storage, not some other, coincidental - // retainer - cache is the only thing keeping any CachedPayload instance reachable. + // The point of this test over the gc-root test: confirm the walk actually passed through + // the cache's own internal storage, not some other, coincidental retainer - cache is the + // only thing keeping any CachedPayload instance reachable. boolean sawHashMapInternals = false; for (String type : match.chain) { if (type.startsWith("java.util.HashMap")) { @@ -815,8 +630,6 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc + "storage (cache is a HashMap) - chain was: " + match.chain); assertTrue(!cache.isEmpty()); // keeps every cached CachedPayload reachable until here } finally { - // Shut the persistent allocator down - shared, no-forkEvery test JVM (see the GcRoot - // test's own finally). if (allocator != null) { allocator.interrupt(); allocator.join(1000); @@ -826,105 +639,70 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc } /** - * This test's stated abandonment-path scenario: an artificially tiny frontier cap - * ({@code getProfilerCommand()}'s {@code framecap=1} for this test method, see that method's own - * comment for why {@code budget} must stay larger than {@code framecap}) makes the very first - * BFS pass hit the frontier cap once a second root-referenced object is discovered, so - * {@code runPass()} (referenceChains.cpp) abandons the search rather than silently truncating it - * - or, if this method's own - * {@code framecap=1} lost the race to size the shared {@code FrontierTable} (see - * {@code getProfilerCommand()}'s own comment on this method), its {@code ttl=100} fallback - * abandons the search instead once enough wall-clock time has passed, which by the time this - * method runs it always has. Either path exercises the same {@code buildAbandonedEvent()} / - * {@code Profiler::writeReferenceChainAbandoned()} / {@code FlightRecorder::recordReferenceChainAbandoned()} - * write into the recording that {@code Profiler::dump()} triggers - this method only asserts that - * a {@code datadog.ReferenceChainAbandoned} event exists, not which reason produced it. + * Abandonment-path scenario: an artificially tiny frontier cap ({@code framecap=1} for this + * test method) makes the very first BFS pass hit the frontier cap once a second root-referenced + * object is discovered, so {@code runPass()} abandons the search rather than silently + * truncating it - or, if this method lost the race to size the shared {@code FrontierTable}, + * its {@code ttl=100} fallback abandons the search instead (by the time this method runs, that + * clock always has). Either path exercises the same {@code buildAbandonedEvent()}/ + * {@code Profiler::writeReferenceChainAbandoned()}/{@code recordReferenceChainAbandoned()} + * write triggered by {@code Profiler::dump()} - this method only asserts that a + * {@code datadog.ReferenceChainAbandoned} event exists, not which reason produced it. * - *

      {@code @Order(3)}: this permanently exhausts the process-wide {@code ReferenceChainTracker} - * singleton's one-and-only search (see this class's header comment), so it must run after - * {@link #shouldReconstructReferrerChainToGcRoot()} and - * {@link #shouldReconstructReferrerChainThroughUnboundedCacheLeak()}. It used to rely on being - * the last method in source order plus JUnit's default (unannotated methods sort after - * {@code @Order}-annotated ones) for that - which happened to guarantee run order, but not the - * search *state* this method's own comment above presumes: if either earlier test's own - * organic GC/allocation-sampling trend never fired in time (observed in practice - real - * flakiness, not this test's fault), the shared search can still be {@code RUNNING} with a - * large, non-fresh frontier when this method starts, instead of the small, just-abandoned one - * its own {@code framecap=1}/{@code ttl=100} scenario assumes. Calling - * {@code resetReferenceChainSearchForTest0()} here, exactly as both earlier tests already do for - * their own scenarios, makes this method's own precondition (a fresh search) something it - * establishes itself rather than something it presumes a prior test left behind. Debug-only: - * this native seam does not exist in a release build. + *

      {@code @Order(3)}: this permanently exhausts the singleton's one-and-only search, so it + * must run after both success-path tests. It also calls {@code resetReferenceChainSearchForTest0()} + * itself: if either earlier test's organic GC/sampling trend never fired in time (real + * flakiness, observed in practice), the shared search can still be {@code RUNNING} with a large, + * non-fresh frontier when this method starts - the fresh-search precondition is something this + * method establishes, not something it presumes. Debug-only: the seam does not exist in a + * release build. * *

      Why this method also seeds a klass population trend, despite requesting no - * {@code generations=true} of its own (found the hard way: {@code resetReferenceChainSearchForTest0()} - * alone was not enough - the search's first pass never ran at all, so it could never reach - * {@code SearchState::ABANDONED} for {@code dump()} to observe): {@code LivenessTracker::_gc_generations} - * (livenessTracker.cpp's {@code initialize()}) is only ever updated when a {@code start()} command - * actually requests liveness tracking - a bare {@code referencechains=true:...} command like this - * method's own does not call {@code LivenessTracker::start()} at all, so + * {@code generations=true} of its own: {@code LivenessTracker::_gc_generations} is only ever + * updated when a {@code start()} command actually requests liveness tracking - a bare + * {@code referencechains=true:...} command never calls {@code LivenessTracker::start()}, so * {@code gcGenerationsEnabled()} stays stuck at whatever the two {@code generations=true} tests - * above last left it (confirmed directly: this method's own native trace shows - * {@code gc_generations=1}). {@code ReferenceChainTracker::hasLeakSignal()}, which - * {@code shouldRunPass()} consults for even this search's very first pass, therefore falls - * through to {@code selectLeakCandidates()} exactly as the two tests above do - with nothing - * left over from {@link #shouldReconstructReferrerChainThroughUnboundedCacheLeak()}'s own - * {@code resetKlassPopulationForTest0()} call to satisfy it. Seeding - * {@code SEED_EPOCHS_FOR_HYSTERESIS} epochs for a dedicated klass id (see - * {@code SEED_EPOCHS_FOR_HYSTERESIS}'s own comment for the full derivation) clears that gate the - * same way it does there - this method never sets a representative or polls for it, since it has - * no reconstructed chain of its own to prove; {@code selectLeakCandidates()} - * (livenessTracker.cpp) counts a qualifying entry toward {@code hasLeakSignal()}'s candidate - * count regardless of whether its representative was ever set, and - * {@code resolveCandidateRepresentative()} is null-safe against one that wasn't. + * above last left it. {@code hasLeakSignal()}, which {@code shouldRunPass()} consults for even + * the search's first pass, therefore falls through to {@code selectLeakCandidates()} exactly as + * the tests above do - and with {@code _klass_population} freshly reset, nothing satisfies it. + * Seeding {@code SEED_EPOCHS_FOR_HYSTERESIS} epochs for a dedicated klass id clears that gate; + * this method never sets a representative or polls for it, since it has no reconstructed chain + * of its own to prove - a qualifying entry counts toward {@code hasLeakSignal()}'s candidate + * count regardless, and {@code resolveCandidateRepresentative()} is null-safe against one that + * was never set. * - *

      Why the seeding is preceded by a {@code System.gc()} and a throwaway {@code dump()} - * (found the hard way, twice: a bare {@code dump()} with no preceding GC still lost the - * race): {@code cleanup_table()} (livenessTracker.cpp) compares - * {@code Profiler::classMap()->generation()} against its own cached copy and, on a mismatch - - * which this method's own fresh {@code start()} causes, by clearing that map - wipes - * {@code _klass_population} back to empty before folding anything else, exactly once per - * mismatch; but that comparison sits *after* an early-return guard - * (`{@code if (!is_epoch_owner && !forced) return;}`) that a {@code dump()}-triggered call - * (always {@code forced=false}) only clears when a genuinely new, not-yet-processed GC epoch - * is pending - a {@code dump()} with no GC since the last {@code cleanup_table()} pass never - * reaches the mismatch check at all. The two methods above never hit any of this because their - * own seed loop runs only after their round-1 {@code System.gc()}+{@code dump()} pair has - * already triggered that one-time wipe-and-resync as a side effect of their own allocation - * loop; seeding before any GC/dump of this method's own would instead leave the seed to be - * discarded by the *next* call that does clear the guard - this class's own - * {@code maybeForceCleanup()} tick (called once per {@code ReferenceChainTracker::threadLoop()} - * wake, {@code forced=true} unconditionally clears the guard), which fires on this method's own - * 3 {@code System.gc()} calls below regardless. The explicit {@code System.gc()}+{@code dump()} - * pair here forces that one-time wipe-and-resync to happen now, before seeding, exactly like - * the two methods above get for free from their own round-1 allocation loop. + *

      Why the seeding is preceded by a {@code System.gc()} and a throwaway {@code dump()}: + * {@code cleanup_table()} compares {@code Profiler::classMap()->generation()} against its own + * cached copy and, on a mismatch - which this method's fresh {@code start()} causes, by clearing + * that map - wipes {@code _klass_population} back to empty, exactly once per mismatch; but that + * comparison sits *after* an early-return guard a {@code dump()}-triggered call + * ({@code forced=false}) only clears when a genuinely new, not-yet-processed GC epoch is + * pending - a dump() with no GC since the last cleanup pass never reaches the mismatch check at + * all. The two tests above get this wipe-and-resync for free from their round-1 + * {@code System.gc()}+{@code dump()} pair; seeding before any GC/dump here would leave the seed + * to be discarded by the next call that does clear the guard - this class's own + * {@code maybeForceCleanup()} tick (once per {@code threadLoop()} wake, {@code forced=true} + * unconditionally clears the guard), which fires on this method's own 3 {@code System.gc()} + * calls below. The explicit pair forces the resync to happen now, before seeding. */ @Test @Order(3) public void shouldReportAbandonedSearchOnTinyFrontierCap() throws Exception { if ("debug".equals(System.getProperty("ddprof_test.config"))) { - // See this method's own javadoc ("Why this method also seeds a klass population trend...") - // for why this is needed even though this method requests no generations=true of its own. - // - // A System.gc() + throwaway dump() first - see this method's own javadoc ("Why the seeding - // is preceded by...") for why *both* are needed: a dump() alone triggers cleanup_table() - // with forced=false, which only clears the class-map-generation-mismatch guard (and - // therefore only wipes/resyncs _klass_population) when a new GC epoch is actually pending - - // this System.gc() is what makes that true for this call, rather than leaving it to chance - // (or to this method's own 3 System.gc() calls below, which run after the seed and would - // let maybeForceCleanup()'s forced=true tick discard it first). + // See the javadoc above for why the seeding is needed despite no generations=true of this + // method's own, and why both a gc() and a throwaway dump() must precede it. System.gc(); - Path warmupDumpPath = Paths.get("referencechains-abandoned-test-warmup.jfr"); + Path warmupDumpPath = Files.createTempFile("referencechains-abandoned-test-warmup-", ".jfr"); + Files.deleteIfExists(warmupDumpPath); try { dump(warmupDumpPath); } finally { Files.deleteIfExists(warmupDumpPath); } ReferenceChainTestHooks.resetKlassPopulationForTest0(); - // Per-(klass, tid) qualification seeds - gate-only usage (this test - // drives the search to ABANDONED and asserts on the abandon marker, no - // tagged instance needs to match), so the tid is this thread's real one - // but any distinct tid would do. + // Gate-only usage: this test drives the search to ABANDONED and asserts on the abandon + // marker, no tagged instance needs to match - so the tid is this thread's real one but any + // distinct tid would do. int abandonTid = ReferenceChainTestHooks.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0( @@ -937,31 +715,24 @@ public void shouldReportAbandonedSearchOnTinyFrontierCap() throws Exception { List gcRootHolder = new ArrayList<>(); gcRootHolder.add(new ChainLink("middle", new ChainLink("leaf"))); - // GarbageCollectionFinish (onGCFinish(), referenceChains.cpp) wakes the BFS thread - // early, but that wakeup can race the thread's own startup (VM::attachThread() - // completing before its first OS::sleep() call) and be missed. Don't rely on the - // signal alone: sleep comfortably past ReferenceChainTracker::PASS_CADENCE_NS (1s, - // referenceChains.h) too, so the thread's fixed-cadence fallback trigger - // (shouldRunPass()) guarantees at least one pass runs regardless of that race. + // GarbageCollectionFinish wakes the BFS thread early, but that wakeup can race the thread's + // own startup (VM::attachThread() completing before its first sleep) and be missed. Sleep + // comfortably past PASS_CADENCE_NS (1s) too, so the fixed-cadence fallback guarantees at + // least one pass runs regardless of that race. for (int i = 0; i < 3; i++) { System.gc(); Thread.sleep(100); } Thread.sleep(1500); - Path dumpPath = Paths.get("referencechains-abandoned-test.jfr"); + Path dumpPath = Files.createTempFile("referencechains-abandoned-test-", ".jfr"); + Files.deleteIfExists(dumpPath); try { - // Even with the seeding above clearing hasLeakSignal()'s gate so the search's first pass is - // actually allowed to start (this method's own javadoc), that pass still has to be woken by - // the BFS thread and still has to actually reach the frontier cap/ttl cutoff, inside whatever - // real wall-clock time this shared, no-forkEvery test JVM's own scheduling happens to grant - // it (this class's own header comment) - a single fixed-length sleep-then-dump-then-assert, - // with no room to retry, previously failed outright whenever that one attempt landed a beat - // early. Retry across a few more dumps, spaced far enough apart to tolerate a slow - // BFS-thread wake or a walk over a larger-than-usual inherited heap, before concluding the - // search genuinely never abandoned - mirroring the bounded retry loops - // shouldReconstructReferrerChainToGcRoot()/shouldReconstructReferrerChainThroughUnboundedCacheLeak() - // already use above. + // Even with the seeding above clearing the gate, the first pass still has to actually reach + // the frontier cap/ttl cutoff inside whatever wall-clock time this shared JVM's scheduling + // grants it - a single fixed-length sleep-then-dump-then-assert previously failed whenever + // that one attempt landed a beat early. Retry across a few more dumps before concluding the + // search genuinely never abandoned. JfrEvents abandoned = null; for (int attempt = 0; attempt < 8; attempt++) { dump(dumpPath); @@ -1028,15 +799,11 @@ private static void awaitAllocatorRound(Semaphore roundDone, Thread allocator, } /** - * Referrer-type fixture shared by both the success-path and abandonment-path tests. The 32 - * {@code long} fields below exist purely so {@link #shouldReconstructReferrerChainToGcRoot()} - * needs far fewer instances to allocate a given number of megabytes of ChainLink - deliberately - * plain fields, not a nested array: an array field would be a *second*, separate heap - * allocation, and the allocation-sampling interval that method's comment describes picks - * whichever allocation happens to cross its byte threshold size-weighted, so a same-instance - * companion array would take sampling attention away from ChainLink itself rather than adding - * to it. Plays no role in {@link #shouldReportAbandonedSearchOnTinyFrontierCap()}'s tiny, - * two-object fixture beyond trivially increasing its size. + * Referrer-type fixture shared by both success-path and abandonment-path tests. The 32 + * {@code long} fields exist purely so a given number of megabytes of ChainLink needs far fewer + * instances - deliberately plain fields, not a nested array: an array field would be a second, + * separate heap allocation, and the size-weighted allocation sampler would take sampling + * attention away from ChainLink itself rather than adding to it. */ private static final class ChainLink { final String name; @@ -1055,16 +822,10 @@ private static final class ChainLink { } /** - * Realistic-leak fixture for {@link #shouldReconstructReferrerChainThroughUnboundedCacheLeak()}: - * models the single most common real-world leak shape this mechanism is meant to catch - an - * unbounded, never-evicted cache - as opposed to {@link ChainLink}'s hand-rolled linked list. - * The 32 {@code long} fields exist purely so a given number of megabytes needs far fewer - * entries to reach {@code ObjectSampler}'s real 256KiB sampling floor - deliberately plain - * fields, not a nested array, for exactly the reason {@link ChainLink}'s own comment already - * documents: a same-instance companion array would be a *second*, separate heap allocation - * that the size-weighted allocation sampler would compete for, taking sampling attention away - * from {@code CachedPayload} itself (an earlier version of this fixture used a {@code byte[]} - * field and never observed a single {@code CachedPayload} sample as a result - the sampler was + * Realistic-leak fixture for the cache test: an unbounded, never-evicted cache - the single + * most common real-world leak shape this mechanism is meant to catch. The 32 {@code long} + * fields are there for the same reason {@link ChainLink}'s are (an earlier version used a + * {@code byte[]} field and never observed a single CachedPayload sample - the sampler was * catching the array instead). */ private static final class CachedPayload { diff --git a/docs/sphinx/specs/2026-10-12-keepbest-only-merges-the-incoming-scan-s.md b/docs/sphinx/specs/2026-10-12-keepbest-only-merges-the-incoming-scan-s.md new file mode 100644 index 0000000000..2ebcba35c3 --- /dev/null +++ b/docs/sphinx/specs/2026-10-12-keepbest-only-merges-the-incoming-scan-s.md @@ -0,0 +1,124 @@ +# Spec: keepbest-only-merges-the-incoming-scan-s + +## Problem + +This review round has nine change requests against the rc-6 reference-chain test and tooling +layer. They fall into seven clusters (see `.sphinx/address/design.md`): + +1. `LeakTagCorrelationScenario.keepBest()` drops the gate violations collected so far whenever a + later scan wins on payload quality. Separately, `run()` prints NOT_FOUND ahead of the violation + markers, and the tight-window variant of `LeakTagCorrelationReferenceChainTest` accepts + NOT_FOUND. Together these let a transient/noise gate regression pass. +2. `utils/run-refchains-repro.sh` expands possibly-empty arrays as `"${A[@]}"` under `set -u`. + On bash 3.2 (macOS `/bin/bash`) that aborts with "unbound variable", although the script + claims to support bash 3.2. +3. `ReferenceChainLeakDemo`: (a) the cache is seeded after `JavaProfiler.getInstance()`, + which contradicts the load-bearing header comment that says seeding happens on the first + line of `main`; (b) `heapUsedFraction()` reports 0.0 when the heap max is undefined, which + turns off all throttling. +4. `ReferenceChainJfrParserTest` reads a fixture at a fixed shared path that nobody ever deletes, + so a stale fixture from an older revision can satisfy the existence check. +5. `AggressiveLeakReferenceChainTest` evaluates the state-mutating seam `shouldRunPassForTest0()` + inside `assertFalse`, against whatever search state an earlier class left behind. +6. `ReferenceChainTrackingTest` dumps to fixed-name JFR files in the CWD at four sites. +7. `.claude/commands/build-and-summarize` keeps the UNKNOWN artifact schema in two places. Its + failure exit masks Gradle's status. Under `set -e`, a failed build aborts at `wait`, so the + summary never runs at all. + +## Correct behaviour + +- **R1:** every transient-rooted (depth ≤ 1, rootKind starting `first_observed_via:`) or + NoisePayload chain seen in any scanned dump ends up in the final result's + `transientViolations`/`noiseChains`. This holds whichever dump's payload is kept and in + whatever order the dumps arrive. Duplicate violation strings appear once. +- **R2:** the payload fields come from the winning scan only. The newer scan wins iff its quality + is ≥ the current best's. Quality order: no chain < out-of-pool < in-pool < in-pool and + correlated. A null scan keeps best, and a null best takes the scan. Early-break conditions are + unchanged. +- **R3:** result precedence. No result at all → NOT_FOUND. Any transient violation → + TRANSIENT_CHAIN_MARKER + list. Otherwise any noise chain → NOISE_CHAIN_MARKER + list. Otherwise + no payload chain → NOT_FOUND. Otherwise out of pool → TAG_OUT_OF_POOL. Otherwise no live object → + NO_LIVE_OBJECT. Otherwise FOUND + tag. Violations are reported even when no payload chain was + ever found. +- **R4:** `run-refchains-repro.sh` launches on bash 3.2 with `set -u` when GC_JVM_OPTS and/or + JAVA_LOG_OPTS are empty, adding no extra arguments. When they are non-empty, each element stays + exactly one argument, with no globbing or splitting. The bash-3.2 commitment stays. +- **R5:** in `ReferenceChainLeakDemo.main`, cache construction and `seed(cache, 300)` are the + first statements, ahead of argument validation, `getInstance()`, printing, and sleeping. The + header comment states that order. +- **R6:** when `MemoryUsage.getMax() <= 0`, the denominator is `Runtime.maxMemory()` if it is a real + bound (`> 0` and `!= Long.MAX_VALUE`). Otherwise the fraction reported is exactly `HIGH_WATERMARK`, + which means throttled growth with no critical pause. An unknown limit never means unthrottled. + When getMax() > 0 the behaviour is unchanged. +- **R7:** the roundtrip fixture is consume-once. The gtest unlinks it before any assertion can bail + out. The Java test deletes it after loading, whether loading succeeds or throws. A missing + fixture means the test skips. It is never validated stale. The path format and its + TMPDIR//tmp resolution are unchanged on both sides. `.trunc` is untouched. +- **R8:** `shouldRunPassForTest0()` never appears inside an assertion expression. In the + flat-floor control it runs right after `resetReferenceChainSearchForTest0()`, so it lands on a + fresh tracker (`_search_started == false`). Its result goes into a local, and a comment notes + that the call mutates state. The heap-floor ring seeding survives until the call: no + `resetKlassPopulationForTest0()` runs between seeding and the call. Setup and the + `restoreHeapFloorDefaults()` teardown order are unchanged. +- **R9:** every dump target in `ReferenceChainTrackingTest` comes from + `Files.createTempFile(-, ".jfr")` followed immediately by `Files.deleteIfExists`. It is + created before any resource that needs try/finally cleanup (no thread is started before it) + and deleted in finally. `java.nio.file.Paths` is no longer imported. +- **R10:** `build-and-summarize` contains exactly one UNKNOWN md/json literal, in the shell + function `write_unknown_summary`. Both UNKNOWN paths go through it: an unusable log, and a + generator failure (exception, or python3 missing). The UNKNOWN JSON has the same keys, in the + same order, as the success-path JSON. `$LOG` in the JSON is escaped for `\` and `"`. +- **R11:** the exit code is Gradle's status when Gradle failed. Otherwise it is the generator's + rc when the generator failed, and 0 otherwise. A failed Gradle build reaches the summary step + (`wait` no longer aborts under `set -e`). An unusable log leaves summary_rc at 0. + +## Constraints + +- Test/tooling-only change set. No production native or Java API change, and no new seams + (`JavaProfilerApiSurfaceTest` seam list unchanged). +- Java 8 source level for ddprof-test and ddprof-stresstest: no `var`, no newer APIs. +- Shell must stay bash 3.2 compatible where the script already claims it (`run-refchains-repro.sh`). + `build-and-summarize` must stay POSIX-sh-like bash with no bash-4-only features. +- Follow the local style: 2-space indent in ddprof-test, 4-space in ddprof-stresstest, and + comments that explain the "why". +- Minimal edits. Do not touch `ThreadLocalLeakScenario`, `MemoryGovernor`, or other test classes + outside the listed sites. + +## Scope + +### Primary fixes +- `ddprof-test/.../referencechains/LeakTagCorrelationScenario.java:392-406` (review line 322): one-directional merge loses violations. Make `keepBest` merge the loser's violations into the winner, and update three comments. +- `utils/run-refchains-repro.sh:151-153` (review line 148): empty-array expansion under `set -u` on bash 3.2. Use the `${A[@]+"${A[@]}"}` guard. +- `ddprof-stresstest/.../repro/ReferenceChainLeakDemo.java:74-78,104-111,146,165-166` (review line 57): code no longer matches the load-bearing ordering comment. Seed first in `main`, pass the cache into `run`. +- `ddprof-stresstest/.../repro/ReferenceChainLeakDemo.java:270-273` (review line 277): unknown max is read as empty heap. Fall back to Runtime.maxMemory, then HIGH_WATERMARK. +- `ddprof-test/.../referencechains/ReferenceChainJfrParserTest.java:62-86` (review line 55) plus `ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp:235-249,279`: stale shared fixture. Make it consume-once. +- `ddprof-test/.../referencechains/AggressiveLeakReferenceChainTest.java:165-167` (+ L33 javadoc): mutating seam evaluated inside an assertion. Reset the search right before the call, hoist it into a local, comment it. +- `ddprof-test/.../referencechains/ReferenceChainTrackingTest.java:304`: fixed-name CWD dump path. Use createTempFile, created at the start of the method. +- `.claude/commands/build-and-summarize:117-125,254-261` (review line 258): UNKNOWN schema duplicated. Use a single shell writer `write_unknown_summary`. +- `.claude/commands/build-and-summarize:262` (review line 265): exit masks Gradle status. Use `exit $(( status != 0 ? status : summary_rc ))`, add a final `exit "$status"`, and add companion C-1 (`wait` under `set -e`, L44-45). Without C-1 the status fix is dead code. + +### Auto-expanded sibling fixes +- **S-1** `LeakTagCorrelationScenario.java:361-371`: gate violation hidden by marker precedence. NOT_FOUND is printed before the violation checks. + FLOW: tight variant → child `run()` → no byte[] chain in any dump but ≥1 transient/noise chain → NOT_FOUND → `LeakTagCorrelationReferenceChainTest.java:189-200` escape hatch → pass. + PRECONDITION: a gate regression where the payload is never resolved. REACHABLE: yes. CONCLUSION: MEDIUM, the same masking as the primary. +- **S-2** `ReferenceChainTrackingTest.java:487`: fixed-name CWD dump path (`referencechains-cache-leak-scratch.jfr`, named in the finding). + FLOW: `shouldReconstructReferrerChainThroughUnboundedCacheLeak` → dump/verify loop on a CWD path. PRECONDITION: parallel workers or a shared checkout, or an aborted earlier run. REACHABLE: yes. CONCLUSION: LOW. +- **S-3** `ReferenceChainTrackingTest.java:690`: fixed-name CWD warmup dump (`referencechains-abandoned-test-warmup.jfr`). + FLOW: `shouldReportAbandonedSearchOnTinyFrontierCap` debug branch → `dump(warmupDumpPath)`. PRECONDITION: as for S-2. REACHABLE: yes (debug). CONCLUSION: LOW. +- **S-4** `ReferenceChainTrackingTest.java:722`: fixed-name CWD dump (`referencechains-abandoned-test.jfr`) that `verifyEvents` reads. + FLOW: the same test's retry loop → `verifyEvents(dumpPath, ...)`. PRECONDITION: as for S-2. REACHABLE: yes. CONCLUSION: LOW. + +Considered and discarded: `ThreadLocalLeakScenario.keepBest` (no violation lists). +`MemoryGovernor.java:148,184` (outside the PR, and the cgroup signal covers the +undefined-heap-max case). `ContendedCallTraceStorageTest.java:70` and +`memleak/LivenessTrackingTest.java:71,107` (outside the PR, pre-existing; candidates for a +follow-up). Bash arrays in `sweep-refchains-*.sh` and `build-and-summarize` (never empty, or the +script is bash-4-only by construction). + +## Assumptions +- Behaviour change accepted: a violation in an early dump now fails a run that later fully correlates, and the tight variant fails on violations-with-no-payload. +- `Runtime.maxMemory()` returns `Long.MAX_VALUE` when there is no limit. +- Consume-once leaves a narrow staleness window: an old-revision gtest wrote the file, nothing consumed it, and the gtest is then skipped. A per-build stamp would need build-logic changes and is out of scope. +- With several configs in one invocation, a later Java config may SKIP the parser test because an earlier config consumed the fixture. This is acceptable. +- R8 deliberately departs from the reviewer's "reset search/population" wording: the population reset would wipe the seeded heap-floor ring and make the control vacuous. +- No runtime evidence was gathered in planning. The bash idioms were checked on /bin/bash 3.2.57. diff --git a/utils/run-refchains-repro.sh b/utils/run-refchains-repro.sh index af57c5ac38..4503ee29ac 100755 --- a/utils/run-refchains-repro.sh +++ b/utils/run-refchains-repro.sh @@ -148,8 +148,9 @@ if [ -n "${DURATION_SECONDS}" ]; then echo "Safepoint/GC log: ${SAFEPOINT_LOG}" fi +# ${arr[@]+"${arr[@]}"}: bash 3.2 (macOS /bin/bash) + set -u treats an empty "${arr[@]}" as unbound. exec "${JAVA_BIN}" \ - "${JAVA_LOG_OPTS[@]}" \ - "${GC_JVM_OPTS[@]}" \ + ${JAVA_LOG_OPTS[@]+"${JAVA_LOG_OPTS[@]}"} \ + ${GC_JVM_OPTS[@]+"${GC_JVM_OPTS[@]}"} \ -agentpath:"${REFCHAINS_SO}"=start,memory=64:l,generations=true,referencechains=${REFERENCECHAINS_OPTS},jfr,file="${JFR_OUT}" \ -jar "${REFCHAINS_JAR}" "${JFR_OUT}" "${REFCHAINS_SO}" ${DURATION_SECONDS} From 354c808d62679db27052ead0902ef2fa63810848 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Tue, 20 Oct 2026 08:43:49 +0200 Subject: [PATCH 08/17] Drop PersistentAllocator left behind by the #800 squash --- .../referencechains/PersistentAllocator.java | 196 ------------------ 1 file changed, 196 deletions(-) delete mode 100644 ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/PersistentAllocator.java diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/PersistentAllocator.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/PersistentAllocator.java deleted file mode 100644 index 02f7b08b9d..0000000000 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/PersistentAllocator.java +++ /dev/null @@ -1,196 +0,0 @@ -/* - * Copyright 2026, Datadog, Inc. All rights reserved. - * SPDX-License-Identifier: Apache-2.0 - */ - -package com.datadoghq.profiler.referencechains; - -import com.datadoghq.profiler.ReferenceChainTestHooks; - -import java.util.concurrent.ArrayBlockingQueue; -import java.util.concurrent.SynchronousQueue; -import java.util.concurrent.TimeUnit; - -/** - * A single long-lived thread that runs caller-supplied allocation batches on demand. - * - *

      Tests use one persistent thread so every instance of the leak klass is allocated by the - * same thread: a fresh short-lived thread per round gets a new tid each time, and the per-tid - * trend qualification ages out before the population trend can establish itself (the flake the - * {@code @Order(1)} test documents). Callers must also seed with this thread's tid, obtained - * from {@link #tid()} - captured on the allocator thread itself, never the caller's. - * - *

      {@link #run(Runnable)} blocks until the batch completes and rethrows any failure from the - * allocator thread, so allocations are finished (and any exception surfaced) before the caller - * proceeds to {@code System.gc()} or a dump. - */ -final class PersistentAllocator implements AutoCloseable { - // Poison task handed to the worker by close(); identity compared, never run. - private static final Runnable CLOSE = () -> { }; - - private static final long HANDOFF_TIMEOUT_SECONDS = 30; - - // One unit of work handed to the worker; carries the caller-side generation - // so the worker can echo it back in the Outcome. The CLOSE poison rides in a - // Job too (generation -1, never a real generation). - private static final class Job { - final Runnable task; - final int generation; - - Job(Runnable task, int generation) { - this.task = task; - this.generation = generation; - } - } - - // The worker's completion entry; the generation identifies which run() - // produced it, so a stale outcome left by an abandoned (timed-out) run is - // discarded by the caller instead of being misattributed to the next task. - private static final class Outcome { - final int generation; - final Object result; // Object marker = success, a Throwable = the batch's failure - - Outcome(int generation, Object result) { - this.generation = generation; - this.result = result; - } - } - - private final SynchronousQueue handoff = new SynchronousQueue<>(); - // Worker-to-caller completion slot: an Outcome with the caller's generation - // = this task's verdict (Object marker = success, a Throwable = the batch's - // failure). It is buffered (one slot) because the protocol is single-in-flight, - // and the worker's offer() must retain the signal even when the batch finishes - // in the window between the handoff rendezvous and the caller entering poll(): - // a SynchronousQueue would drop that bare offer and turn a completed batch - // (or its rethrown failure) into a 30-second poll timeout. - private final ArrayBlockingQueue completion = new ArrayBlockingQueue<>(1); - private final Thread thread; - private volatile int tid; - private volatile boolean closed; - // Monotonic per-run() token; only the caller thread runs tasks through run(), - // so plain int arithmetic is sufficient. - private int nextGeneration; - - PersistentAllocator(String name) { - thread = new Thread(this::loop, name); - // Daemon: a test that dies before close() must not hold the JVM open on handoff.take(). - thread.setDaemon(true); - thread.start(); - // The caller may call tid() immediately after construction (seed-before-wait ordering); - // do not return until the allocator thread has published it. - long deadline = System.nanoTime() + TimeUnit.SECONDS.toNanos(HANDOFF_TIMEOUT_SECONDS); - while (tid == 0 && thread.isAlive()) { - if (System.nanoTime() - deadline > 0) { - throw new IllegalStateException("allocator thread " + name + " never published its tid"); - } - Thread.yield(); - } - if (tid == 0) { - throw new IllegalStateException("allocator thread " + name + " died before publishing its tid"); - } - } - - /** The allocator thread's OS tid, captured by that thread itself at startup. */ - int tid() { - return tid; - } - - /** - * Runs {@code task} on the allocator thread, blocking until it completes. A task that throws - * is rethrown on the caller's thread, so a failed batch fails the test instead of stalling - * the next round on partially-allocated state. - */ - void run(Runnable task) { - if (closed || !thread.isAlive()) { - throw new IllegalStateException("allocator thread " + thread.getName() + " is no longer running"); - } - try { - // A previous run() that timed out may still have its outcome parked in - // the slot (the worker finishes the abandoned task and offers into the - // then-empty queue). Drop what is already there; the generation check - // below then discards any stale outcome that lands after this clear - - // a plain clear alone cannot close that window, because the worker only - // parks at handoff.take() AFTER offering the abandoned task's outcome. - completion.clear(); - int generation = nextGeneration++; - if (!handoff.offer(new Job(task, generation), HANDOFF_TIMEOUT_SECONDS, TimeUnit.SECONDS)) { - throw new IllegalStateException("allocator thread " + thread.getName() + " did not accept a task"); - } - long deadline = System.nanoTime() + TimeUnit.SECONDS.toNanos(HANDOFF_TIMEOUT_SECONDS); - while (true) { - Outcome outcome = completion.poll(deadline - System.nanoTime(), TimeUnit.NANOSECONDS); - if (outcome == null) { - throw new IllegalStateException("allocator thread " + thread.getName() + " never finished a task"); - } - // Discard an abandoned earlier run()'s outcome and keep waiting for this - // generation's verdict. The stale entry is always offered before our own: - // the worker offers it before looping back to handoff.take(), through - // which alone our Job can be accepted. - if (outcome.generation != generation) { - continue; - } - if (outcome.result instanceof RuntimeException) { - throw (RuntimeException) outcome.result; - } - if (outcome.result instanceof Error) { - throw (Error) outcome.result; - } - return; - } - } catch (InterruptedException e) { - Thread.currentThread().interrupt(); - throw new IllegalStateException("interrupted while waiting for allocator thread " + thread.getName(), e); - } - } - - /** Stops the allocator thread and waits for it to exit. Idempotent. */ - @Override - public void close() { - if (closed) { - return; - } - closed = true; - try { - if (thread.isAlive() && handoff.offer(new Job(CLOSE, -1), HANDOFF_TIMEOUT_SECONDS, TimeUnit.SECONDS)) { - // Drain the exit acknowledgement so close() returns only after the thread is done. - completion.poll(HANDOFF_TIMEOUT_SECONDS, TimeUnit.SECONDS); - } - thread.join(TimeUnit.SECONDS.toMillis(HANDOFF_TIMEOUT_SECONDS)); - } catch (InterruptedException e) { - Thread.currentThread().interrupt(); - } - } - - private void loop() { - tid = ReferenceChainTestHooks.getTid(); - try { - while (true) { - Job job = handoff.take(); - if (job.task == CLOSE) { - // put (blocking), not offer: after an abandoned run() the slot can still - // hold that run's stale outcome, and a dropped exit acknowledgement would - // leave close()'s poll draining the stale entry instead. close() always - // drains exactly one entry after the handoff, which unblocks this put. - completion.put(new Outcome(job.generation, new Object())); // exit acknowledgement; no further work arrives - return; - } - Object outcome = null; - try { - job.task.run(); - } catch (RuntimeException | Error t) { - outcome = t; - } - // put (blocking), not offer: with one slot, a stale outcome left by an - // abandoned (timed-out) run() can still occupy the queue when this - // task finishes, and a dropped outcome would turn a completed task into - // the caller's 30s poll timeout. The caller's generation loop drains the - // stale entry (discard-by-generation), which unblocks this put; if the - // caller already gave up, the next run()'s clear() or close()'s poll does. - completion.put(new Outcome(job.generation, outcome != null ? outcome : new Object())); - } - } catch (InterruptedException e) { - Thread.currentThread().interrupt(); - } - } -} From 2208136e7dcc00abefeec452707bd311177fbd53 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Tue, 20 Oct 2026 11:36:28 +0200 Subject: [PATCH 09/17] Restore the dropped reference-chain test seams and fix the drain count native name Renaming the Java declaration to drainReferenceChainEventCount0() left no JNI symbol for it in any build; rename both javaApi.cpp definitions (no-arg, no leaf filter) instead, and restore the four removed seam declarations (frontier state, resolved target tag, heap-floor reset/rising) the tests need, plus the roundtrip gtest's stale env-var comment and its unread .expected sidecar writer. --- ddprof-lib/src/main/cpp/javaApi.cpp | 47 ++++------------ .../com/datadoghq/profiler/JavaProfiler.java | 53 +++++++++++++++++-- .../cpp/referenceChainJfrRoundtrip_ut.cpp | 40 ++++---------- .../profiler/JavaProfilerApiSurfaceTest.java | 2 + .../profiler/ReferenceChainTestHooks.java | 27 ++++++++++ 5 files changed, 98 insertions(+), 71 deletions(-) diff --git a/ddprof-lib/src/main/cpp/javaApi.cpp b/ddprof-lib/src/main/cpp/javaApi.cpp index 8e53d568f5..59ab1ec452 100644 --- a/ddprof-lib/src/main/cpp/javaApi.cpp +++ b/ddprof-lib/src/main/cpp/javaApi.cpp @@ -1239,48 +1239,21 @@ Java_com_datadoghq_profiler_JavaProfiler_pollReferenceChainTargets0( ReferenceChainTracker::instance()->finishLoopIterationSerialized(jvmti, env); } -// Counts only the drained chains whose leaf hop (hops are stored leaf-first) is `leaf`'s class, -// so a chain left cached by an earlier test in the same JVM cannot satisfy the caller. The class -// id is resolved with the same GetClassSignature + normalizeClassSignature() + lookupClass() -// sequence the chain collector uses (LivenessTracker::resolveKlassId()). +// Drains and returns the number of reference-chain events queued by +// pollReferenceChainTargets0() so far (the same queue Profiler::dump() drains in production +// to write datadog.ReferenceChain JFR events) - lets a test assert a chain was actually +// reconstructed without needing a real JFR dump. extern "C" DLLEXPORT jint JNICALL -Java_com_datadoghq_profiler_JavaProfiler_drainReferenceChainEventCountForLeaf0( - JNIEnv *env, jclass unused, jobject leaf) { +Java_com_datadoghq_profiler_JavaProfiler_drainReferenceChainEventCount0( + JNIEnv *env, jclass unused) { ProfiledThread::initCurrentThreadSignalSafe(); jvmtiEnv *jvmti = VM::jvmti(); - if (leaf == nullptr || jvmti == nullptr) { - return 0; - } - u32 leaf_id = 0; - jclass clz = env->GetObjectClass(leaf); - if (clz != nullptr) { - char *sig = nullptr; - if (jvmti->GetClassSignature(clz, &sig, nullptr) == JVMTI_ERROR_NONE && - sig != nullptr) { - const char *name = nullptr; - size_t name_len = 0; - if (ObjectSampler::normalizeClassSignature(sig, &name, &name_len)) { - int id = Profiler::instance()->lookupClass(name, name_len); - if (id > 0) { - leaf_id = (u32)id; - } - } - jvmti->Deallocate((unsigned char *)sig); - } - env->DeleteLocalRef(clz); - } - if (leaf_id == 0) { + if (jvmti == nullptr) { return 0; } std::vector events; ReferenceChainTracker::instance()->drainPendingChainEvents(&events); - jint count = 0; - for (const ReferenceChainEvent &event : events) { - if (!event._hops.empty() && event._hops[0].klass_id == leaf_id) { - count++; - } - } - return count; + return (jint)events.size(); } extern "C" DLLEXPORT void JNICALL @@ -1480,8 +1453,8 @@ Java_com_datadoghq_profiler_JavaProfiler_pollReferenceChainTargets0( JNIEnv *env, jclass unused) {} extern "C" DLLEXPORT jint JNICALL -Java_com_datadoghq_profiler_JavaProfiler_drainReferenceChainEventCountForLeaf0( - JNIEnv *env, jclass unused, jobject leaf) { +Java_com_datadoghq_profiler_JavaProfiler_drainReferenceChainEventCount0( + JNIEnv *env, jclass unused) { return 0; } diff --git a/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java b/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java index 85dd582360..aae738a477 100644 --- a/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java +++ b/ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java @@ -463,10 +463,12 @@ public Map getDebugCounters() { private static native int getTid0(); /** - * Test seam (debug native builds only): returns the calling thread's profiler tid - the same - * tid space {@code seedTidTrendSample0} matches tracked instances' allocating threads against. - * Scenarios seeding per-(klass, tid) ramps must call this ON the leaking thread, or the - * qualifying tid matches no tracked instance and no leak tag is ever assigned. + * Test seam: returns the calling thread's profiler tid + * (ProfiledThread::currentTid()), the tid space {@code seedTidTrendSample0} matches + * against. Unlike the tracker-mutating seams it only reads thread state, so it is + * compiled unconditionally and works in release builds too. Must be called ON the + * leaking thread, or the seeded tid will match no tracked instance and no leak tag + * will be assigned. */ static int getTid() { return getTid0(); @@ -666,6 +668,28 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l */ static native long getReferenceChainPendingSizeForTest0(); + /** + * Test seam (-DDEBUG native builds only - debug/asan/tsan; returns -1 in release): does not + * tag {@code target}. The raw {@code FrontierEntryState} (canonical values: + * referenceChainFrontier.h) of the current search's frontier entry for target - 0 = FRONTIER + * (admitted, not yet expanded), 1 = EXPANDED, 2 = EDGE (retired: never produced by the + * production walk, so this seam does not return it in practice), 3 = ABANDONED - or + * {@code -1} if target has no frontier entry (never admitted, or still carrying only a leak + * tag). + */ + static native int getReferenceChainFrontierStateForTest0(Object target); + + /** + * Test seam (-DDEBUG native builds only - debug/asan/tsan; returns 0 in release): does not + * tag {@code target}. The targetTag the {@code datadog.ReferenceChain} event for target + * carries, if a cached chain exists for target; 0 otherwise. When target carries a frontier + * tag, only the current search's cached chain counts. When target carries a leak tag, a chain + * cached by any search generation counts, but only if it was built during target's current + * ownership of that leak tag: leak tags are recycled after their object dies, so identity is + * the (leak tag, ownership-period stamp) pair, not the tag alone. + */ + static native long getReferenceChainResolvedTargetTagForTest0(Object target); + /** * Test seam (debug native builds only): seeds one heap-floor-ring sample - the input to * {@code LivenessTracker::secondsToOOM()}'s time-to-OOM projection - directly, bypassing the @@ -693,6 +717,27 @@ private static native void setTraceContext0(long localRootSpanId, long spanId, l */ static native void setHeapFloorRecordingForTest0(boolean enabled); + /** + * Test seam (debug native builds only): clears the heap-floor ring seeded via + * {@link #heapFloorRecordForTest0(long, long)} so the next test in the same JVM does not + * inherit this test's samples into its {@code secondsToOOM()} projection. Must be called + * while heap-floor recording is disabled (i.e. before the + * {@link #setHeapFloorRecordingForTest0(boolean)} restore in a finally block) - the seam + * asserts when called while recording is enabled, because a concurrent sample cannot be + * excluded from the two non-atomic index stores otherwise. + */ + static native void heapFloorResetForTest0(); + + /** + * Test seam (debug native builds only): reports whether the seeded heap-floor ring + * currently shows a sustained rise ({@code heapFloorRising()}) - the aggregate growth + * read {@code hasLeakSignal()}'s gate uses alongside {@code secondsToOOM()}'s urgent + * projection. Returns {@code false} both before any seeding and after + * {@link #heapFloorResetForTest0()} emptied the ring, which is how tests assert the + * reset actually cleared the indices. + */ + static native boolean heapFloorRisingForTest0(); + /** * Test seam (debug native builds only): reports whether ReferenceChainTracker's search-restart * gate ({@code canAffordNewSearch()} -> {@code hasLeakSignal()}) would currently allow a diff --git a/ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp b/ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp index 7af0b2a410..2f56827d37 100644 --- a/ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp +++ b/ddprof-lib/src/test/cpp/referenceChainJfrRoundtrip_ut.cpp @@ -234,11 +234,10 @@ class ReferenceChainJfrRoundtripTest : public ::testing::Test { }; // Path agreed with the companion Java parser test in ddprof-test, which -// reads the same file back via JMC's -// JfrLoaderToolkit. Both sides resolve it via the OS temp dir so the -// producer (this gtest) and the consumer (the Java test, run afterwards by -// the same operator/CI job on the same machine) agree without either side -// needing to know the other module's build directory layout. +// reads the same file back via JMC's JfrLoaderToolkit. The build passes the +// same DDPROF_REFERENCE_CHAIN_ROUNDTRIP_JFR to both sides (ddprof-lib and +// ddprof-test build.gradle.kts) and deletes the file before this gtest runs; +// the OS temp dir is only a fallback for running the binary by hand. // The file is consume-once: ProducesValidStandaloneJfrWithChainEvent unlinks it before // writing and the Java test deletes it after reading. static std::string chainRoundtripJfrPath() { @@ -328,9 +327,9 @@ TEST_F(ReferenceChainJfrRoundtripTest, ProducesValidStandaloneJfrWithChainEvent) // serializes into the T_CLASS checkpoint - this is the exact API // Profiler::lookupClass() already-existing tests use (e.g. // referenceChains_ut.cpp's ReconstructsChainForSyntheticGraph). - // The constants feed both the lookup and the .expected sidecar below, so - // the companion Java parser test reads the seeded values from a single - // source instead of duplicating them. + // The constants feed the lookup below; the companion Java parser test + // (ReferenceChainJfrParserTest) hardcodes the same values, so a change to + // the seeding must update both sides - a deliberate two-module diff. static constexpr const char *kLeafClass = "com/test/ChainLeaf"; static constexpr const char *kMiddleClass = "com/test/ChainMiddle"; static constexpr const char *kRootClass = "com/test/ChainRoot"; @@ -401,28 +400,9 @@ TEST_F(ReferenceChainJfrRoundtripTest, ProducesValidStandaloneJfrWithChainEvent) // same finalization every real recording chunk goes through. } - // The values this test seeds, written next to the recording: the companion - // Java parser test (ReferenceChainJfrParserTest) asserts against this - // sidecar instead of hard-coding them, so a change to the seeding shows - // up as a deliberate gtest-only diff rather than an opaque assertion - // failure in the other module. The Java side maps the slashed internal - // names to JMC's dotted IMCType full names. - { - std::string expectedPath = path + ".expected"; - FILE *expected = fopen(expectedPath.c_str(), "w"); - ASSERT_NE(nullptr, expected) << "could not open " << expectedPath; - fprintf(expected, "chain.length=%d\n", 3); - fprintf(expected, "chain.0=%s\n", kLeafClass); - fprintf(expected, "chain.1=%s\n", kMiddleClass); - fprintf(expected, "chain.2=%s\n", kRootClass); - fprintf(expected, "edges.0=field\n"); - fprintf(expected, "edges.1=element\n"); - fprintf(expected, "edges.2=jni_global\n"); - fprintf(expected, "targetTag=%lld\n", (long long)event._target_tag); - fprintf(expected, "depth=%u\n", event._depth); - fprintf(expected, "leakTagIncarnation=%u\n", event._leak_tag_incarnation); - fclose(expected); - } + // No .expected sidecar: the Java parser test hardcodes the seeded values + // (chain names, edges labels, targetTag=3, depth=2), so writing a sidecar + // nothing reads would only leave a stale file in the temp/build dir. FILE *f = fopen(path.c_str(), "rb"); ASSERT_NE(nullptr, f) << "expected " << path << " to have been written"; diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/JavaProfilerApiSurfaceTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/JavaProfilerApiSurfaceTest.java index a7075f91f3..6ce81762cc 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/JavaProfilerApiSurfaceTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/JavaProfilerApiSurfaceTest.java @@ -35,7 +35,9 @@ public void ownedBlockHooksAreNotPublicApiBeforeTaskBlockInstrumentation() throw "tagAsReferenceChainRoot0", "runReferenceChainPass0", "pollReferenceChainTargets0", "drainReferenceChainEventCount0", "resetReferenceChainSearchForTest0", "getReferenceChainPendingPositionForTest0", "getReferenceChainPendingSizeForTest0", + "getReferenceChainFrontierStateForTest0", "getReferenceChainResolvedTargetTagForTest0", "heapFloorRecordForTest0", "setMaxHeapBytesForTest0", "setHeapFloorRecordingForTest0", + "heapFloorResetForTest0", "heapFloorRisingForTest0", "shouldRunPassForTest0", "referenceChainPassesRunForTest0")); @Test diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java b/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java index 1fafa3917e..fb5d5f427c 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/ReferenceChainTestHooks.java @@ -70,6 +70,14 @@ public static long getReferenceChainPendingSizeForTest0() { return JavaProfiler.getReferenceChainPendingSizeForTest0(); } + public static int getReferenceChainFrontierStateForTest0(Object target) { + return JavaProfiler.getReferenceChainFrontierStateForTest0(target); + } + + public static long getReferenceChainResolvedTargetTagForTest0(Object target) { + return JavaProfiler.getReferenceChainResolvedTargetTagForTest0(target); + } + public static void heapFloorRecordForTest0(long usedBytes, long timestampNs) { JavaProfiler.heapFloorRecordForTest0(usedBytes, timestampNs); } @@ -82,6 +90,25 @@ public static void setHeapFloorRecordingForTest0(boolean enabled) { JavaProfiler.setHeapFloorRecordingForTest0(enabled); } + /** + * Clears the heap-floor ring seeded via {@link #heapFloorRecordForTest0(long, long)} so + * the next test in the same JVM starts from an empty ring. Call before the + * {@link #setHeapFloorRecordingForTest0(boolean)} restore, while recording is still + * disabled - the native seam asserts when called while recording is enabled. + */ + public static void heapFloorResetForTest0() { + JavaProfiler.heapFloorResetForTest0(); + } + + /** + * Reports whether the seeded heap-floor ring currently shows a sustained rise + * ({@code heapFloorRising()}). {@code false} before any seeding and after + * {@link #heapFloorResetForTest0()} emptied the ring. + */ + public static boolean heapFloorRisingForTest0() { + return JavaProfiler.heapFloorRisingForTest0(); + } + /** Not a pure predicate - see {@link JavaProfiler}'s own {@code shouldRunPassForTest0()} doc. */ public static boolean shouldRunPassForTest0() { return JavaProfiler.shouldRunPassForTest0(); From 240a9488a939d7dc7f1fa90e94546141293f2f82 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Tue, 20 Oct 2026 11:36:38 +0200 Subject: [PATCH 10/17] Restore reverted reference-chain test fixes and debug-build guards Replaces the literal "debug" config checks with isDebugInstrumentedBuild() (debug/asan/tsan all compile the seams) and requiredTestConfig()'s fail-loud forwarding; restores the synchronized testLogTail guards, the frontier-state EXPANDED wait and target-tag matching, the ThreadLocalMap-hop filter and (tag, incarnation) correlation, the handoff-timeout marker, painbudget=100, the scaled child timeouts, the ActiveSetting id check, the matched population seeds, the pass-count baseline ordering, the held[0] reservation, the ring-reset mutation-killer test, and the roundtrip JFR env-var-first lookup. --- .../datadoghq/profiler/ExternalLauncher.java | 68 +--- .../AggressiveLeakReferenceChainTest.java | 44 +- .../ExternalProcessReferenceChainTest.java | 132 +++--- .../LeakTagCorrelationReferenceChainTest.java | 42 +- .../LeakTagCorrelationScenario.java | 7 +- .../referencechains/LeakingCacheScenario.java | 2 +- .../ReferenceChainAssertions.java | 69 +++- .../ReferenceChainJfrParserTest.java | 19 +- .../ReferenceChainTestSeamsTest.java | 2 +- .../ReferenceChainTrackingTest.java | 48 ++- .../StaticFieldGrowingCollectionScenario.java | 377 +++++++++++++----- .../ThreadLocalLeakReferenceChainTest.java | 64 +-- .../ThreadLocalLeakScenario.java | 190 ++++++--- 13 files changed, 722 insertions(+), 342 deletions(-) diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java b/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java index b24394ef0e..b22c6f42e4 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/ExternalLauncher.java @@ -247,14 +247,9 @@ public static void main(String[] args) throws Exception { // "|||" packed into one args[1] string rather // than extending launch()'s generic (target, commands) contract with a 3rd // argument every other mode would have to ignore. - String packed = args.length == 2 ? args[1] : ""; - int sep = packed.indexOf("|||"); - if (sep < 0) { - throw new IllegalArgumentException( - "leak-cache requires \"|||\", got: " + packed); - } - String commands = packed.substring(0, sep); - String scratchPath = packed.substring(sep + "|||".length()); + String[] packed = unpackScenarioArgs("leak-cache", args); + String commands = packed[0]; + String scratchPath = packed[1]; JavaProfiler instance = JavaProfiler.getInstance(); // The scenario itself calls execute(commands) - it needs to seed its cache fixture // *before* starting the profiler. @@ -265,59 +260,40 @@ public static void main(String[] args) throws Exception { // result line. System.exit(0); } else if (args[0].equals("leak-static-field")) { - // Same "|||" packing as leak-cache above. - String packed = args.length == 2 ? args[1] : ""; - int sep = packed.indexOf("|||"); - if (sep < 0) { - throw new IllegalArgumentException( - "leak-static-field requires \"|||\", got: " + packed); - } - String commands = packed.substring(0, sep); - String scratchPath = packed.substring(sep + "|||".length()); + // Same packing as leak-cache (unpackScenarioArgs()). + String[] packed = unpackScenarioArgs("leak-static-field", args); + String commands = packed[0]; + String scratchPath = packed[1]; JavaProfiler instance = JavaProfiler.getInstance(); StaticFieldGrowingCollectionScenario.run(instance, commands, Paths.get(scratchPath)); System.out.flush(); System.exit(0); } else if (args[0].equals("leak-correlation")) { - // Same "|||" packing as leak-cache above. - String packed = args.length == 2 ? args[1] : ""; - int sep = packed.indexOf("|||"); - if (sep < 0) { - throw new IllegalArgumentException( - "leak-correlation requires \"|||\", got: " + packed); - } - String commands = packed.substring(0, sep); - String scratchPath = packed.substring(sep + "|||".length()); + // Same packing as leak-cache (unpackScenarioArgs()). + String[] packed = unpackScenarioArgs("leak-correlation", args); + String commands = packed[0]; + String scratchPath = packed[1]; JavaProfiler instance = JavaProfiler.getInstance(); LeakTagCorrelationScenario.run(instance, commands, Paths.get(scratchPath)); System.out.flush(); System.exit(0); } else if (args[0].equals("threadlocal-leak")) { - // Same "|||" packing as leak-cache above. - String packed = args.length == 2 ? args[1] : ""; - int sep = packed.indexOf("|||"); - if (sep < 0) { - throw new IllegalArgumentException( - "threadlocal-leak requires \"|||\", got: " + packed); - } - String commands = packed.substring(0, sep); - String scratchPath = packed.substring(sep + "|||".length()); + // Same packing as leak-cache (unpackScenarioArgs()). + String[] packed = unpackScenarioArgs("threadlocal-leak", args); + String commands = packed[0]; + String scratchPath = packed[1]; JavaProfiler instance = JavaProfiler.getInstance(); ThreadLocalLeakScenario.run(instance, commands, Paths.get(scratchPath)); System.out.flush(); System.exit(0); } else if (args[0].equals("threadlocal-leak-late")) { - // Same packing as threadlocal-leak, but the leak thread is started only AFTER the - // recording began - the regression shape for Profiler::onThreadStart's - // registerThreadObject() wiring (ThreadLocalLeakScenario.run()'s lateThread comment). - String packed = args.length == 2 ? args[1] : ""; - int sep = packed.indexOf("|||"); - if (sep < 0) { - throw new IllegalArgumentException( - "threadlocal-leak-late requires \"|||\", got: " + packed); - } - String commands = packed.substring(0, sep); - String scratchPath = packed.substring(sep + "|||".length()); + // Same packing as threadlocal-leak (unpackScenarioArgs()), but the leak thread is + // started only AFTER the recording began - the regression shape for + // Profiler::onThreadStart's registerThreadObject() wiring + // (ThreadLocalLeakScenario.run()'s lateThread comment). + String[] packed = unpackScenarioArgs("threadlocal-leak-late", args); + String commands = packed[0]; + String scratchPath = packed[1]; JavaProfiler instance = JavaProfiler.getInstance(); ThreadLocalLeakScenario.run(instance, commands, Paths.get(scratchPath), true); System.out.flush(); diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java index 0084ad6920..187a715777 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/AggressiveLeakReferenceChainTest.java @@ -56,9 +56,9 @@ protected boolean isPlatformSupported() { } private static void assumeDebugBuild() { - assumeTrue("debug".equals(System.getProperty("ddprof_test.config")), + assumeTrue(ReferenceChainAssertions.isDebugInstrumentedBuild(), "heapFloorRecordForTest0/setMaxHeapBytesForTest0/shouldRunPassForTest0 only exist in a " - + "debug native build (javaApi.cpp's #ifdef DEBUG guard)"); + + "-DDEBUG native build (debug/asan/tsan - javaApi.cpp's #ifdef DEBUG guard)"); } /** @@ -104,6 +104,9 @@ public void shouldOpenSearchGateOnAggressiveHeapWideGrowthWithNoLeakCandidate() ReferenceChainTestHooks.resetKlassPopulationForTest0(); ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); try { + // Baseline BEFORE publishing any urgency input: the live BFS thread may run the one + // urgency-authorized search as soon as the samples below land, and that pass must count. + int passesBefore = ReferenceChainTestHooks.referenceChainPassesRunForTest0(); // 1000 MiB fake max heap, rising from 100 MiB to 991 MiB over 9 (fake) seconds: ~99 MiB/s, // 9 MiB of headroom left at the last sample -> projected time-to-OOM ~= 9/99 s, far under // OOM_URGENT_THRESHOLD_S = 300s. @@ -119,7 +122,6 @@ public void shouldOpenSearchGateOnAggressiveHeapWideGrowthWithNoLeakCandidate() "This test's own precondition: no per-klass candidate should exist, so passes running " + "below can only come from the aggregate urgent-OOM bypass"); - int passesBefore = ReferenceChainTestHooks.referenceChainPassesRunForTest0(); // Idle BFS cadence is ~1s/pass; urgency ramps it to ~10ms after the latch. 20s covers the // first evaluation landing up to one idle cadence after the seeding loop. long deadline = System.currentTimeMillis() + 20_000; @@ -178,4 +180,40 @@ public void shouldNotOpenSearchGateOnFlatHeapFloorWithNoLeakCandidate() { restoreHeapFloorDefaults(); } } + + /** + * Kills a no-op'd {@code heapFloorResetForTest0()} mutation: every other call site resets in + * a finally block that no assertion observes, so without this test a reset whose body was + * dropped (or whose JNI entry was left as the release stub) would leave the whole suite + * green while leaking one test's seeded samples into the next test's JVM. The rising-then- + * empty pair is asserted directly through {@code heapFloorRising()} - the same read the + * aggregate gate uses - so the reset's effect is checked, not assumed. + */ + @Test + public void shouldEmptyHeapFloorRingOnReset() { + assumeDebugBuild(); + ReferenceChainTestHooks.setHeapFloorRecordingForTest0(false); + ReferenceChainTestHooks.resetKlassPopulationForTest0(); + ReferenceChainTestHooks.resetReferenceChainSearchForTest0(); + try { + // Same rising seeds as shouldOpenSearchGateOnAggressiveHeapWideGrowthWithNoLeakCandidate: + // 100 MiB to 991 MiB over 9 fake seconds, which clears heapFloorRising()'s growth and + // floor bars at exactly the min-fill trend window (fill = 10 samples). + for (int i = 0; i < 10; i++) { + long usedBytes = (100L + i * 99L) * 1024 * 1024; + long timestampNs = i * 1_000_000_000L; + ReferenceChainTestHooks.heapFloorRecordForTest0(usedBytes, timestampNs); + } + assertTrue(ReferenceChainTestHooks.heapFloorRisingForTest0(), + "Precondition: the seeded samples must read as a sustained rise before the reset"); + ReferenceChainTestHooks.heapFloorResetForTest0(); + assertFalse(ReferenceChainTestHooks.heapFloorRisingForTest0(), + "heapFloorResetForTest0() must empty the ring: fill = 0 falls below the min-fill " + + "trend gate heapFloorRising() requires"); + } finally { + // Same order as the other tests: ring reset first, still disabled. + ReferenceChainTestHooks.heapFloorResetForTest0(); + ReferenceChainTestHooks.setHeapFloorRecordingForTest0(true); + } + } } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java index 19a31b7e36..55da7b61ff 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ExternalProcessReferenceChainTest.java @@ -12,6 +12,7 @@ import java.nio.file.Files; import java.nio.file.Path; +import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.concurrent.atomic.AtomicReference; @@ -22,25 +23,20 @@ import static org.junit.jupiter.api.Assumptions.assumeFalse; /** - * Genuinely separate-process end-to-end coverage for the reference-chains target-selection - * mechanism, complementing {@link ReferenceChainTrackingTest}'s in-process coverage: runs a real - * "leaking Java app" (an ever-growing, never-evicted {@code HashMap}-backed cache - see - * {@link LeakingCacheScenario}) in a separate child JVM, launched the same way - * {@code JavaProfilerTest}/{@code JVMAccessTest} launch child processes, and asserts on the - * child's own reported result. + * Separate-process end-to-end coverage for the reference-chains target-selection mechanism, + * complementing {@link ReferenceChainTrackingTest}'s in-process coverage: runs a "leaking Java + * app" (see {@link LeakingCacheScenario}) in a child JVM and asserts on the child's reported + * result. * *

      Why a separate process, not another {@code @Test} in {@code ReferenceChainTrackingTest}: - * an earlier attempt did exactly that and failed reliably whenever it ran after that class's own - * {@code ChainLink} test - not a test-ordering bug, but a genuine property of - * {@code ReferenceChainTracker}: {@code runPass()} performs exactly one root-seeded - * {@code FollowReferences} walk per search's *entire lifetime* ({@code _search_started}); every - * later pass only expands frontier entries that walk already discovered ({@code expandFrontier()}) - * - it never re-examines GC roots or revisits an already-{@code EXPANDED} entry for newly-added - * children. Since the tracker is a process-wide singleton, only the *first* test to ever call - * {@code runPass()} in a given JVM gets a real root-seeded walk; every subsequent test's own, - * independently-rooted local variables are structurally invisible afterward. A separate child JVM - * per scenario sidesteps this: each process gets its own fresh singleton, and therefore its own - * guaranteed first-ever root walk. + * {@code runPass()} (referenceChains.cpp) performs exactly one root-seeded {@code FollowReferences} + * walk per search's *entire lifetime* ({@code _search_started}); every later pass only expands + * frontier entries that walk already discovered ({@code expandFrontier()}) - it never + * re-examines GC roots or revisits an already-{@code EXPANDED} entry for newly-added children. + * Since {@code ReferenceChainTracker} is a process-wide singleton, only the *first* test to call + * {@code runPass()} in a given JVM gets a root-seeded walk; later tests' independently-rooted + * locals are invisible to it. A child JVM per scenario gets its own fresh singleton and + * therefore its own first root walk. */ @Tag("slow") public class ExternalProcessReferenceChainTest extends AbstractProcessProfilerTest { @@ -57,46 +53,39 @@ void shouldReconstructReferrerChainInSeparateProcess() throws Exception { // LeakingCacheScenario.run() (inside the child) creates this file on its own first dump() - // an empty placeholder here would make that first dump() attempt fail confusingly. Files.deleteIfExists(scratchDumpPath); - // "start" requires a "jfr,file=..." clause (found the hard way: JavaProfiler.execute() - // throws "Flight Recorder output file is not specified" without one) even though this - // scenario never reads its content - only the explicit dump() calls - // LeakingCacheScenario.run() makes to scratchDumpPath matter. + // "start" requires a "jfr,file=..." clause (JavaProfiler.execute() throws "Flight Recorder + // output file is not specified" without one) even though its content is never read. Path continuousJfrPath = Files.createTempFile("referencechains-external-process-continuous", ".jfr"); try { - // budget=200000 (up from the in-process test's 4000, found via TEST_LOG instrumentation): - // a genuinely fresh external JVM's reachable-from-roots graph (full JUnit/JMC/Gradle-worker - // classpath, bootstrapped from scratch) is far larger than the in-process test's, and each - // pass's walk cost scales with cumulative frontier size, not with this scenario's allocation - // rate - budget=4000 stayed truncated=1 at 76000+ admitted edges after 19 real passes and - // never got close to this scenario's own cache before the timeout. _budget is the pacing - // controller's hard ceiling - pausetarget alone cannot compensate for a ceiling set too - // low. memory=64:l:1.0 - the explicit 100% live-sample ratio removes the default 10% - // subsampling lottery from the tracked-instance pool (see - // LeakTagCorrelationReferenceChainTest's comment); total volume stays capped by the 256KiB + // budget=200000 (up from the in-process test's 4000): a cold external JVM's + // reachable-from-roots graph (full JUnit/JMC/Gradle-worker classpath) is far larger than + // the in-process test's, and each pass's JVMTI walk cost scales with cumulative frontier + // size - budget=4000 stayed truncated=1 at 76000+ admitted edges after 19 passes and never + // reached the cache before timeout. _budget is the pacing controller's hard ceiling (see + // updatePacing(), referenceChains.cpp) - pausetarget only paces *within* it. + // memory=64:l:1.0 - the 100% live-sample ratio removes the default 10% subsampling + // lottery from the tracked-instance pool; total volume stays capped by the 256KiB // interval floor, so the tracking table remains tiny. String startCommand = "start,memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=200000:ttl=120000:framecap=2000000:pausetarget=60000" + ",jfr,file=" + continuousJfrPath.toAbsolutePath(); - // Packed into one args[1] string - see ExternalLauncher's own "leak-cache" mode comment - // for why (avoids extending AbstractProcessProfilerTest.launch()'s generic (target, - // commands) contract with a 3rd argument every other mode would have to ignore). + // Packed into one args[1] string to avoid extending AbstractProcessProfilerTest.launch()'s + // generic (target, commands) contract with a 3rd argument. String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); - // Propagates this JVM's own ddprof_test.config (set by ProfilerTestPlugin.kt on the - // ddprof-test Test task itself, not inherited by a ProcessBuilder-launched child on its - // own) so LeakingCacheScenario can use the same debug-only seeded-representative fallback - // ReferenceChainTrackingTest already relies on instead of depending purely on real - // allocation-sampling timing. + // ddprof_test.config is set on the Test task by ProfilerTestPlugin.kt and is not inherited + // by a ProcessBuilder-launched child; the scenario needs it for its debug-only seeding. + // requiredTestConfig() also fails loud when the property is unset instead of forwarding + // the literal "null", which the child would classify as a release build. List jvmArgs = Collections.singletonList( - "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); + "-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); AtomicReference resultLine = new AtomicReference<>(); LaunchResult result = launch("leak-cache", jvmArgs, packedCommand, Collections.emptyMap(), - // Generous: a whole separate JVM's startup/classloading cost, on top of the same - // up-to-25-round population-growth loop plus grace period that takes ~20s in-process - // (ReferenceChainTrackingTest's own history). - 90, + // Generous: a separate JVM's startup/classloading cost on top of the up-to-25-round + // growth loop plus grace period (~20s in-process). + childTimeoutSeconds(90), line -> { if (line.startsWith(LeakingCacheScenario.FOUND_MARKER) || line.equals(LeakingCacheScenario.NOT_FOUND_MARKER) @@ -125,13 +114,12 @@ void shouldReconstructReferrerChainInSeparateProcess() throws Exception { /** * Mirrors {@link #shouldReconstructReferrerChainInSeparateProcess()}, but against {@link - * StaticFieldGrowingCollectionScenario}: a {@code static final List} field appended to - * (never reassigned) after its owning class has already been swept once by {@code - * admitStaticFieldRoots()} - the exact shape found in the {@code prof-analyzer-hotdog-jb} pod's - * real leak generator. Local, fast reproduction of whether {@code - * collectStaleExpandedEntriesForRotation()}'s rotation mechanism actually re-expands an - * already-{@code EXPANDED} static-field-rooted collection to pick up elements added after its - * one-time sweep. + * StaticFieldGrowingCollectionScenario} instead of {@link LeakingCacheScenario}: a {@code + * static final List} field appended to (never reassigned) after its owning class has + * already been swept once by {@code admitStaticFieldRoots()} (referenceChains.cpp), as opposed + * to {@code LeakingCacheScenario}'s local-variable (stack-root) cache. Checks that + * {@code collectStaleExpandedEntriesForRotation()} re-expands an already-{@code EXPANDED} + * static-field-rooted collection to pick up elements added after its one-time sweep. */ @Test void shouldReconstructReferrerChainForGrowingStaticFieldCollection() throws Exception { @@ -143,29 +131,47 @@ void shouldReconstructReferrerChainForGrowingStaticFieldCollection() throws Exce Files.deleteIfExists(scratchDumpPath); Path continuousJfrPath = Files.createTempFile("referencechains-static-field-external-process-continuous", ".jfr"); try { - // See shouldReconstructReferrerChainInSeparateProcess()'s comment for why budget/pausetarget - // are raised this far above the in-process test's defaults for a cold external JVM; the - // memory=64:l:1.0 ratio rationale is in LeakTagCorrelationReferenceChainTest's comment. + // budget/pausetarget/memory: see shouldReconstructReferrerChainInSeparateProcess(). + // painbudget=100 - the safepoint pain budget exists to protect a production + // app from back-to-back expensive passes, but here it starves the engine + // on a loaded box: a cold external JVM's search costs seconds of measured + // safepoint pain, the default cap (5% of wall-clock) clears that debt in + // ~a minute, and the tail then watches a terminal engine with all tags + // released and no new search for its whole window (observed as 1900+ + // consecutive blocked-iteration evaluations and the watched chunk reading + // tag=0 at every poll - the pass/fail line between otherwise identical + // runs). 100% only lets debt clear as fast as it accrues; cadence stays + // bounded by each search's own ~seconds of work, so this cannot spin. String startCommand = "start,memory=64:l:1.0,generations=true," + "referencechains=true:hops=64:budget=200000:ttl=120000:framecap=2000000:pausetarget=60000" + + ":painbudget=100" + ",jfr,file=" + continuousJfrPath.toAbsolutePath(); String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); - List jvmArgs = Collections.singletonList( - "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); + List jvmArgs = new ArrayList<>(); + jvmArgs.add("-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); + // --add-opens: the scenario reflects into Collections$SynchronizedList.list and + // ArrayList.elementData to check its holders' expansion state before creating lateChunk. + // JDK 8 has no module system (that reflection needs no opening) and rejects the option. + if (Platform.isJavaVersionAtLeast(9)) { + jvmArgs.add("--add-opens=java.base/java.util=ALL-UNNAMED"); + } AtomicReference resultLine = new AtomicReference<>(); + AtomicReference seamPathLine = new AtomicReference<>(); LaunchResult result = launch("leak-static-field", jvmArgs, packedCommand, Collections.emptyMap(), // Wider than shouldReconstructReferrerChainInSeparateProcess()'s 90s: this scenario's // own tail wait (StaticFieldGrowingCollectionScenario.run()) needs up to ~60s on top of // the round loop for a cold JVM's first full pass to actually complete - see that // method's own comment. - 150, + childTimeoutSeconds(150), line -> { if (line.startsWith(StaticFieldGrowingCollectionScenario.FOUND_MARKER) || line.equals(StaticFieldGrowingCollectionScenario.NOT_FOUND_MARKER)) { resultLine.set(line); + } else if (line.startsWith(StaticFieldGrowingCollectionScenario.SEAM_PATH_MARKER)) { + seamPathLine.set(line); } return LineConsumerResult.CONTINUE; }, @@ -173,13 +179,17 @@ void shouldReconstructReferrerChainForGrowingStaticFieldCollection() throws Exce assertTrue(result.inTime, "Child process did not exit within the wait timeout"); assertEquals(0, result.exitCode, "Child process exited with a non-zero code"); + // The scenario's native test seams are compiled into every -DDEBUG build (debug/asan/tsan), + // so the strong seam path must be taken on exactly those configs - the same single + // encoding the child itself uses, not an independent string match here. + boolean expectSeams = ReferenceChainAssertions.isDebugInstrumentedBuild(); + assertEquals(StaticFieldGrowingCollectionScenario.SEAM_PATH_MARKER + expectSeams, + seamPathLine.get(), + "scenario's seam-path predicate must match the native -DDEBUG build set"); assertNotNull(resultLine.get(), "Child process never printed a recognizable result marker on stdout"); assertEquals( - // "byte[]", not byte[].class.getName()'s "[B": the scenario prints - // match.chain.get(0).getFullName(), and JMC's IMCType renders array types in Java source - // notation - see ReferenceChainAssertions.jmcStyleName() for why matching needs the - // same distinction. + // "byte[]", not "[B": JMC's IMCType renders array types in Java source notation. StaticFieldGrowingCollectionScenario.FOUND_MARKER + "byte[]", resultLine.get(), "Expected a successfully reconstructed chain to a byte[] chunk appended to the static " diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java index 72369b0a2d..1b1f372fe8 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationReferenceChainTest.java @@ -17,14 +17,18 @@ import java.util.Collections; import java.util.Deque; import java.util.List; +import java.util.Map; import java.util.concurrent.atomic.AtomicBoolean; import java.util.concurrent.atomic.AtomicReference; +import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_BASE; +import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_POOL_SIZE; import static org.junit.jupiter.api.Assertions.assertEquals; import static org.junit.jupiter.api.Assertions.assertNotNull; import static org.junit.jupiter.api.Assertions.assertTrue; import static org.junit.jupiter.api.Assertions.fail; import static org.junit.jupiter.api.Assumptions.assumeFalse; +import static org.junit.jupiter.api.Assumptions.assumeTrue; /** * End-to-end coverage of the leak-tag correlation use case in a genuinely separate child @@ -98,6 +102,14 @@ private void assertCorrelationFound(String pauseTargetOption, assumeFalse(Platform.isJavaVersion(8)); assumeFalse(Platform.isJ9()); assumeFalse(Platform.isZing()); + if (requireFrontierRotation) { + // The FRONTIER-rotation signal is a level-2 TEST_LOG line (referenceChainWalk.cpp, + // collectLeakAccumulationCandidatesForRotation) - compiled out without -DDEBUG + // (debug/asan/tsan only) and silent unless DD_PROFILING_REFERENCE_CHAINS_DEBUG=2. + assumeTrue(ReferenceChainAssertions.isDebugInstrumentedBuild(), + "FRONTIER-rotation assertion needs the reference-chains TEST_LOG stream, only " + + "compiled into DEBUG-instrumented builds (debug/asan/tsan)"); + } Path scratchDumpPath = Files.createTempFile("referencechains-correlation-", ".jfr"); Files.deleteIfExists(scratchDumpPath); @@ -129,15 +141,21 @@ private void assertCorrelationFound(String pauseTargetOption, String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); List jvmArgs = Collections.singletonList( - "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); + "-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); AtomicReference resultLine = new AtomicReference<>(); + // Level 2 is required for the FRONTIER-selection TEST_LOG line (rcDebugLevel.h); the + // loose variant keeps the default (silent) level. + Map childEnv = requireFrontierRotation + ? Collections.singletonMap("DD_PROFILING_REFERENCE_CHAINS_DEBUG", "2") + : Collections.emptyMap(); LaunchResult result = launch("leak-correlation", jvmArgs, packedCommand, - Collections.emptyMap(), + childEnv, // The scenario's own round loop (up to 25 rounds plus a 5-attempt grace period, // ~40-60s observed) on top of a cold external JVM's startup/classloading cost and - // this scenario's larger graph - same margin logic as the existing scenarios. - 150, + // this scenario's larger graph - same margin logic as the existing scenarios. The + // stale-owner check after a debug-build correlation adds up to ~10s. + childTimeoutSeconds(150), line -> { if (line.startsWith(LeakTagCorrelationScenario.FOUND_MARKER) || line.equals(LeakTagCorrelationScenario.NOT_FOUND_MARKER) @@ -158,9 +176,13 @@ private void assertCorrelationFound(String pauseTargetOption, || line.contains("reconstructChain")) { // reconstruction attempted, failed correlationActivitySeen.set(true); } - testLogTail.addLast(line); - while (testLogTail.size() > 2000) { - testLogTail.removeFirst(); + // The reader thread can still be running after a join timeout, so every access + // to the tail is synchronized (diagnostics() reads a snapshot). + synchronized (testLogTail) { + testLogTail.addLast(line); + while (testLogTail.size() > 2000) { + testLogTail.removeFirst(); + } } } return LineConsumerResult.CONTINUE; @@ -213,7 +235,11 @@ private void assertCorrelationFound(String pauseTargetOption, * gotw batch-size trace (batch control regressions), and any leak-tag interception or * correlation lines. Capped so the message stays readable. */ - private static String diagnostics(Deque testLogTail) { + private static String diagnostics(Deque testLogTailRef) { + List testLogTail; + synchronized (testLogTailRef) { + testLogTail = new ArrayList<>(testLogTailRef); + } if (testLogTail.isEmpty()) { return "\n(no TEST_LOG output captured - non-debug build or no reference-chain passes ran)"; } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java index 9a7c5ca018..83cd91efd9 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java @@ -223,7 +223,10 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } // Churn one slot at a time: the population stays live-but-ephemeral (constant live // count, nothing durably retained beyond the frame) while still allocating. - held[(int) (slot++ % held.length)] = new NoisePayload(); + // held[0] is reserved: it is the published noise representative, and after + // handoff.take() this frame is its only strong reference (the tracker holds just a + // weak ref) - churning it would let the representative be collected. + held[1 + (int) (slot++ % (held.length - 1))] = new NoisePayload(); } }, "leak-correlation-noise"); noiseThread.setDaemon(true); @@ -233,7 +236,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD profiler.execute(startCommand); } - boolean debugBuild = "debug".equals(System.getProperty("ddprof_test.config")); + boolean debugBuild = ReferenceChainAssertions.isDebugInstrumentedBuild(); // Declared at method scope: the per-round and final-attempt maintenance // seeding below (in their own debugBuild blocks) reuse these tids. int leakTid = 0; diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java index a66fd1ad15..c2404f563c 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakingCacheScenario.java @@ -98,7 +98,7 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD } System.out.println("[debug] profiler.execute() returned"); - boolean debugBuild = "debug".equals(System.getProperty("ddprof_test.config")); + boolean debugBuild = ReferenceChainAssertions.isDebugInstrumentedBuild(); boolean seededTestKlassTrend = false; ReferenceChainAssertions.ChainMatch match = null; int totalRounds = 25; diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java index f411ba6901..68b7c58364 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainAssertions.java @@ -21,17 +21,52 @@ import java.util.Map; /** - * Shared {@code datadog.ReferenceChain} JFR-parsing helpers, extracted out of - * {@code ReferenceChainTrackingTest} so that test and {@link LeakingCacheScenario} (run inside a - * genuinely separate child JVM by {@code ExternalProcessReferenceChainTest}) reuse the exact same - * JMC-accessor logic rather than maintaining two copies. The jafar-backed - * {@link #findMatchForClass(JfrEvents, Class)} overload serves in-process tests loading recordings - * via {@code AbstractProfilerTest}'s helpers; the JMC {@code IItemCollection} overload serves - * tests loading recordings directly via {@code JfrLoaderToolkit}. + * Shared {@code datadog.ReferenceChain} JFR-parsing helpers. + * + *

      Two overloads because callers load recordings differently: + * {@code ReferenceChainTrackingTest} uses {@code AbstractProfilerTest}'s {@code JfrEvents} + * helpers ({@link #findMatchForClass(JfrEvents, Class)}), while {@link LeakingCacheScenario} loads + * via JMC's {@code JfrLoaderToolkit} ({@link #findMatchForClass(IItemCollection, Class)}). */ public final class ReferenceChainAssertions { private ReferenceChainAssertions() {} + /** + * Leak-tag pool range, mirrored from referenceChains.h / livenessTracker.h (LEAK_TAG_BASE, + * LEAK_TAG_POOL_SIZE): a correlated chain's targetTag and its HeapLiveObject's leakTag must fall + * into [LEAK_TAG_BASE, LEAK_TAG_BASE + LEAK_TAG_POOL_SIZE). Asserted against runtime event + * values. + */ + public static final long LEAK_TAG_BASE = 0x40000000L; + + public static final long LEAK_TAG_POOL_SIZE = 256; + + /** + * True on every native build that compiles javaApi.cpp's {@code #ifdef DEBUG} test seams: debug, + * asan and tsan (all add -DDEBUG, ConfigurationPresets.kt). Release builds get no-op seam stubs. + * Child JVMs see the same answer because the launchers forward {@code -Dddprof_test.config}. + */ + public static boolean isDebugInstrumentedBuild() { + String config = System.getProperty("ddprof_test.config"); + return config != null && ("debug".equals(config) || config.endsWith("san")); + } + + /** + * The {@code ddprof_test.config} value ProfilerTestPlugin.kt sets on every test task. + * Launchers forwarding it to a child JVM must fail loud when it is unset (a test run directly + * from an IDE, outside the Gradle tasks) instead of concatenating the literal "null", which the + * child would silently classify as a release build and take the unseeded, flakier path. + */ + public static String requiredTestConfig() { + String config = System.getProperty("ddprof_test.config"); + if (config == null) { + throw new IllegalStateException( + "ddprof_test.config is not set; run via a test Gradle task so the child " + + "JVM sees the right build configuration"); + } + return config; + } + /** Result of {@link #findMatchForClass(IItemCollection, Class)}: one resolved chain event's fields. */ public static final class ChainMatch { public final List chain; @@ -65,6 +100,21 @@ public static final class JfrChainMatch { * own comment). Returns {@code null} if {@code events} is empty or none match. */ public static ChainMatch findMatchForClass(IItemCollection events, Class targetClass) { + return findMatch(events, targetClass, false, 0); + } + + /** + * Same as {@link #findMatchForClass(IItemCollection, Class)}, but identifies one specific + * instance: only an item whose {@code targetTag} equals {@code requiredTargetTag} matches (an + * item without a readable {@code targetTag} never does). + */ + public static ChainMatch findMatchForClassAndTargetTag(IItemCollection events, + Class targetClass, long requiredTargetTag) { + return findMatch(events, targetClass, true, requiredTargetTag); + } + + private static ChainMatch findMatch(IItemCollection events, Class targetClass, + boolean requireTag, long requiredTargetTag) { if (events == null || !events.hasItems()) { return null; } @@ -89,11 +139,14 @@ public static ChainMatch findMatchForClass(IItemCollection events, Class targ || !targetName.equals(((IMCType) rawChain[0]).getFullName())) { continue; } + long targetTag = targetTagAccessor != null ? numberValue(targetTagAccessor.getMember(item)) : -1; + if (requireTag && targetTag != requiredTargetTag) { + continue; + } List chain = new ArrayList<>(rawChain.length); for (Object element : rawChain) { chain.add((IMCType) element); } - long targetTag = targetTagAccessor != null ? numberValue(targetTagAccessor.getMember(item)) : -1; int depth = depthAccessor != null ? (int) numberValue(depthAccessor.getMember(item)) : -1; return new ChainMatch(chain, targetTag, depth); } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java index 0c43438bb7..b9c0c4110d 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainJfrParserTest.java @@ -61,13 +61,17 @@ public class ReferenceChainJfrParserTest { private static final String EVENT_TYPE = "datadog.ReferenceChain"; /** - * Same path the companion gtest resolves to: the OS temp dir (TMPDIR, falling back to /tmp), - * agreed by both sides - the gtest (ddprof-lib) and this test (ddprof-test) are different - * Gradle modules with no other filesystem contract between them. The file is consume-once: this - * test deletes it after loading and the gtest unlinks it before regenerating, so a stale fixture - * from an earlier build can never satisfy the existence assumption below. + * The path the companion gtest resolves to: {@code DDPROF_REFERENCE_CHAIN_ROUNDTRIP_JFR} when + * set (ddprof-lib's build sets it to a build-dir path for both the gtest and this test task), + * otherwise the OS temp dir (TMPDIR, falling back to /tmp) for standalone runs. The file is + * consume-once: this test deletes it after loading and the gtest unlinks it before regenerating, + * so a stale fixture from an earlier build can never satisfy the existence assumption below. */ private static Path roundtripJfrPath() { + String configured = System.getenv("DDPROF_REFERENCE_CHAIN_ROUNDTRIP_JFR"); + if (configured != null && !configured.isEmpty()) { + return Paths.get(configured); + } String tmp = System.getenv("TMPDIR"); String dir = (tmp != null && !tmp.isEmpty()) ? tmp : "/tmp"; return Paths.get(dir, "datadog_reference_chain_roundtrip.jfr"); @@ -77,8 +81,9 @@ private static Path roundtripJfrPath() { public void chainFieldResolvesToSeededClassNamesInLeafToRootOrder() throws IOException, CouldNotLoadRecordingException { Path jfrPath = roundtripJfrPath(); - // CI runners without Google Test (e.g. el7), or runs where the gtest has not re-run since the - // fixture was last consumed, have no fixture - skip rather than fail. + // Assumption, not assertion: the producing gtest does not run on CI runners without Google + // Test (e.g. the el7 testRelease job) or with -Pskip-gtest. The build deletes the file before + // the gtest runs, and when the gtest is skipped, so an existing file is always this build's. Assumptions.assumeTrue(Files.exists(jfrPath), "Expected " + jfrPath + " to exist - run " + ":ddprof-lib:gtestDebug_referenceChainJfrRoundtrip_ut first " diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java index 64e1c5604c..bf8c073c06 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTestSeamsTest.java @@ -64,7 +64,7 @@ protected boolean isPlatformSupported() { } private static void assumeDebugBuild() { - assumeTrue("debug".equals(System.getProperty("ddprof_test.config"))); + assumeTrue(ReferenceChainAssertions.isDebugInstrumentedBuild()); } /** Seeds twenty epochs of strictly increasing population counts, then asserts diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java index 4868012a3e..28de9d6789 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ReferenceChainTrackingTest.java @@ -15,7 +15,6 @@ import org.junit.jupiter.api.Tag; import org.junit.jupiter.api.Test; import org.junit.jupiter.api.TestMethodOrder; -import org.junitpioneer.jupiter.RetryingTest; import java.nio.file.Files; import java.util.concurrent.LinkedBlockingQueue; @@ -111,6 +110,13 @@ public class ReferenceChainTrackingTest extends AbstractProfilerTest { // for the same cheap-insurance-against-collision reason those two are distinct from each other. private static final int ABANDON_TEST_KLASS_ID = 987203; + /** + * The {@code datadog.ReferenceChain} ActiveSetting's {@code id} (flightRecorder.cpp's + * T_REFERENCE_CHAIN). ActiveSetting events from cpu/wall/memory/nativemem also read + * "enabled"="true", so the id is the only unambiguous discriminator. + */ + private static final long REFERENCE_CHAIN_EVENT_ID = 129; + // Upper bound on any single main-thread wait for the persistent allocator thread: a // dead/stuck allocator must fail the test, not hang the shared test fork. private static final long ALLOCATOR_HANDOFF_TIMEOUT_MS = 30_000; @@ -186,13 +192,15 @@ protected String getProfilerCommand() { // (restartSearch()/resetSearchStateForTest() both call _pain_budget.spend(_search_pain_ms) // unconditionally) - at the default 1% refill, draining that debt would take minutes. if ("shouldReportAbandonedSearchOnTinyFrontierCap".equals(testName)) { - return "referencechains=true:hops=32:budget=500:framecap=1:ttl=100:painbudget=100"; + // memory=64:l:1.0 is load-bearing: Profiler::start() only starts the ReferenceChainTracker + // when allocation sampling activated (activated & EM_ALLOC); a bare referencechains=... falls + // back to cpu-only and never runs the search. No generations=true: LivenessTracker::initialize() + // then clears _gc_generations, so hasLeakSignal() returns true without any population trend. + return "memory=64:l:1.0,referencechains=true:hops=32:budget=500:framecap=1:ttl=100:painbudget=100"; } - // Deliberately does not request cpu/wall/memory/nativemem: those categories also write an - // "enabled" ActiveSetting, so "enabled"="true" is unambiguous evidence of the - // datadog.ReferenceChain setting without needing to disambiguate by the "id" field (JMC's - // generic accessor lookup does not resolve that field for this custom event type - not worth - // a bespoke accessor for one assertion). + // shouldExposeReferenceChainsSettingWhenEnabled: a referencechains-only command. Arguments::parse() + // implicitly falls back to cpu profiling, whose ActiveSetting is also "enabled"="true", so the + // test also matches on the ActiveSetting "id" (T_REFERENCE_CHAIN, REFERENCE_CHAIN_EVENT_ID). return "referencechains=true:hops=32:budget=500:ttl=2000:framecap=256"; } @@ -210,14 +218,17 @@ protected boolean isPlatformSupported() { * {@code datadog.ReferenceChain} JFR setting (flightRecorder.cpp:1143's * {@code writeBoolSetting(buf, T_REFERENCE_CHAIN, "enabled", args._reference_chains)}). */ - @RetryingTest(5) + @Test public void shouldExposeReferenceChainsSettingWhenEnabled() { stopProfiler(); JfrEvents settings = verifyEvents("jdk.ActiveSetting"); boolean sawEnabledSetting = false; for (JfrEvent item : settings) { - if ("enabled".equals(item.getString("name")) && "true".equals(item.getString("value"))) { + if (item.getLong("id", -1) == REFERENCE_CHAIN_EVENT_ID + && "enabled".equals(item.getString("name")) + && "true".equals(item.getString("value"))) { sawEnabledSetting = true; + break; } } assertTrue(sawEnabledSetting, "datadog.ReferenceChain#enabled setting was not found"); @@ -259,7 +270,7 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { // array, so index 0 is always present in whichever array the walk snapshots. gcRootHolder = new ArrayList<>(); gcRootHolder.add(new ChainLink("gc-root-seed")); - if ("debug".equals(System.getProperty("ddprof_test.config"))) { + if (ReferenceChainAssertions.isDebugInstrumentedBuild()) { // Being pinned first within this class does not make this the first reference-chain test in // the whole shared JVM - another test class can run first and leave the singleton search // already non-RUNNING/already-tagged, in which case runPass() never takes its real @@ -352,7 +363,7 @@ public void shouldReconstructReferrerChainToGcRoot() throws Exception { dump(scratchDumpPath); match = ReferenceChainAssertions.findMatchForClass(verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false), ChainLink.class); - if (match == null && "debug".equals(System.getProperty("ddprof_test.config"))) { + if (match == null && ReferenceChainAssertions.isDebugInstrumentedBuild()) { // Debug-only native seams - a no-op in release builds, so release-build coverage of the // organic path below is unchanged. // @@ -477,7 +488,7 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc // applies here too. Map cache = new HashMap<>(); cache.put("cache-leak-seed", new CachedPayload("cache-leak-seed")); - if ("debug".equals(System.getProperty("ddprof_test.config"))) { + if (ReferenceChainAssertions.isDebugInstrumentedBuild()) { // Force a genuine fresh search rather than depend on the natural restartSearch() cycle being // gated on cadence/pacing budget (canAffordNewSearch()) firing again within this method's // retry budget. @@ -563,7 +574,7 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc JfrEvents events1 = verifyEvents(scratchDumpPath, "datadog.ReferenceChain", false); match = ReferenceChainAssertions.findMatchForClass(events1, CachedPayload.class); - if (match == null && "debug".equals(System.getProperty("ddprof_test.config"))) { + if (match == null && ReferenceChainAssertions.isDebugInstrumentedBuild()) { // Same deterministic short-circuit as the gc-root test: the seed is what authorizes the // background BFS thread's next real pass, so the explicit poll below is best-effort; // and seed exactly once, since reseeding would corrupt the ring into a non-monotonic @@ -573,13 +584,16 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc if (!seededTestKlassTrend) { // The seeds name the allocator thread's tid: it allocated every CachedPayload, // including the keys[0] representative - NOT this JUnit worker's tid, which allocated - // none of them. + // none of them. Seeds match the organic ramp (epoch, not epoch*10): inflated seeds + // made the slope go negative (-20..-40 observed) once real samples (about 1..15 per + // epoch) pushed the seeds out of the trend window - see the gc-root test's identical + // seeding for the derivation. int leakTid = (int) allocatorTid.get(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0( - CACHED_PAYLOAD_TEST_KLASS_ID, epoch * 10, epoch); + CACHED_PAYLOAD_TEST_KLASS_ID, epoch, epoch); ReferenceChainTestHooks.seedTidTrendSample0( - CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch * 3, epoch); + CACHED_PAYLOAD_TEST_KLASS_ID, leakTid, epoch, epoch); } seededTestKlassTrend = true; } @@ -688,7 +702,7 @@ public void shouldReconstructReferrerChainThroughUnboundedCacheLeak() throws Exc @Test @Order(3) public void shouldReportAbandonedSearchOnTinyFrontierCap() throws Exception { - if ("debug".equals(System.getProperty("ddprof_test.config"))) { + if (ReferenceChainAssertions.isDebugInstrumentedBuild()) { // See the javadoc above for why the seeding is needed despite no generations=true of this // method's own, and why both a gc() and a throwaway dump() must precede it. System.gc(); diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java index b1cbefee7e..5f5e3f2fb6 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/StaticFieldGrowingCollectionScenario.java @@ -12,11 +12,14 @@ import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit; import java.io.InputStream; +import java.lang.reflect.Field; import java.nio.file.Files; import java.nio.file.Path; import java.util.ArrayList; +import java.util.Arrays; import java.util.Collections; import java.util.List; +import java.util.concurrent.TimeUnit; /** * Mimics the real leak shape found in the {@code prof-analyzer-hotdog-jb} pod's leak generator @@ -41,9 +44,12 @@ private StaticFieldGrowingCollectionScenario() {} /** * Mirrors production's {@code ProfileAnalyzer.LEAK_BUFFER}: a static field holding a * {@code synchronizedList}, appended to (never reassigned) for the process's whole - * life. + * life. The backing ArrayList is pre-sized so it never reallocates during the scenario: the + * elementData array checked as EXPANDED before lateChunk is appended is the very array that ends + * up holding lateChunk. */ - static final List LEAK_BUFFER = Collections.synchronizedList(new ArrayList<>()); + static final List LEAK_BUFFER = + Collections.synchronizedList(new ArrayList<>(StaticFieldGrowingCollectionScenario.LEAK_BUFFER_CAPACITY)); // Arbitrary, scenario-chosen klass id - see LeakingCacheScenario.CACHED_PAYLOAD_TEST_KLASS_ID's // own comment; distinct from that scenario's id since both may run in the same suite (each in @@ -62,9 +68,36 @@ private StaticFieldGrowingCollectionScenario() {} private static final int SEED_CHUNKS = 10; + private static final int TOTAL_ROUNDS = 25; + + // Each tail rotation appends a chunk to LEAK_BUFFER, so LEAK_BUFFER_CAPACITY covers these too. + private static final int TAIL_ATTEMPTS = 40; + + // Consecutive tail attempts the same chunk stays the watched target before rotating - see the + // tail loop. + private static final int TAIL_CHUNK_ATTEMPTS = 8; + + // Seeds + lateChunk + one per round + one per tail attempt (worst case), so LEAK_BUFFER's + // elementData never reallocates. + private static final int LEAK_BUFFER_CAPACITY = + SEED_CHUNKS + 1 + TOTAL_ROUNDS + TAIL_ATTEMPTS; + + // FrontierEntryState::EXPANDED (referenceChainFrontier.h), as reported by + // ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(). + private static final int FRONTIER_STATE_EXPANDED = 1; + + // ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0()'s "no frontier entry" sentinel. + private static final int FRONTIER_STATE_NONE = -1; + /** Printed to stdout, followed by the matched leaf class's name, on success. */ public static final String FOUND_MARKER = "[chain-found] "; + /** + * Printed to stdout, followed by {@code true}/{@code false}, once the scenario has decided + * whether it takes the native test-seam path (every -DDEBUG build: debug/asan/tsan). + */ + public static final String SEAM_PATH_MARKER = "[seam-path] "; + /** Printed to stdout (with no class name suffix) if no match was ever observed. */ public static final String NOT_FOUND_MARKER = "[chain-not-found]"; @@ -72,7 +105,7 @@ private StaticFieldGrowingCollectionScenario() {} * Seeds {@link #LEAK_BUFFER}, starts the profiler, then keeps appending new {@code byte[]} * chunks to the same list instance - the exact shape implicated in the live hotdog-pod stall - * watching specifically for a chain to a chunk appended *after* the static field's one-time - * sweep, until a {@code datadog.ReferenceChain} event for it appears or {@code totalRounds} is + * sweep, until a {@code datadog.ReferenceChain} event for it appears or {@code TOTAL_ROUNDS} is * exhausted. */ public static void run(JavaProfiler profiler, String startCommand, Path scratchDumpPath) throws Exception { @@ -83,10 +116,13 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD profiler.execute(startCommand); } - boolean debugBuild = "debug".equals(System.getProperty("ddprof_test.config")); + // The seams used below are compiled into every -DDEBUG native build - debug, asan and tsan + // (javaApi.cpp's #ifdef DEBUG block; ConfigurationPresets.kt) - so the seam path must be + // enabled on all three. Same predicate as LeakTagCorrelationReferenceChainTest's rotation + // gate; release builds get the no-op stubs. + boolean debugBuild = ReferenceChainAssertions.isDebugInstrumentedBuild(); + System.out.println(SEAM_PATH_MARKER + debugBuild); int hysteresisEpoch = 0; - // Declared at method scope: the per-round maintenance seeding below (in - // its own debugBuild block) reuses this tid. int leakTid = 0; // Snapshotted BEFORE seeding anything, while the BFS thread's search has not run a single // pass yet (referenceChainPassesRunForTest0() reads 0 here) - see the wait loop below for why @@ -94,136 +130,252 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD int initialPasses = debugBuild ? ReferenceChainTestHooks.referenceChainPassesRunForTest0() : -1; if (debugBuild) { - // Seed enough hysteresis-qualifying epochs to unlock hasLeakSignal()/shouldRunPass() - - // WITHOUT wiring in a representative object yet: hasLeakSignal() only asks - // selectLeakCandidates() for a nonzero count, never reads the representative. Doing this - // BEFORE waiting on passesRun() advancing below is load-bearing: a pass only ever runs once - // shouldRunPass() sees a leak signal - waiting before seeding anything is a deadlock. - // Per-(klass, tid) seeds: the qualifying tid must be the thread that allocates the tracked - // instances - this thread allocates every LEAK_BUFFER chunk, including lateChunk. + // Pins the frontier-state seam's -1 sentinel: an untagged object (tag 0) has no frontier + // entry. Probed before any seeding - no pass can run until shouldRunPass() sees a leak + // signal - so the BFS root walk cannot have tagged the probe yet. + int untaggedState = ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(new Object()); + if (untaggedState != FRONTIER_STATE_NONE) { + throw new IllegalStateException("frontier-state seam returned " + untaggedState + + " for an untagged probe object, expected " + FRONTIER_STATE_NONE); + } + // Wire a representative for the seeded klass BEFORE the seeds (set-representative-first + // is the load-bearing order: klassPopulationSetRepresentativeForTest() re-keys the + // synthetic entry to the representative's real klass id, and only a representative lets + // the entry mint stable_class_tag). Without a representative topKlassesByGenerationCount() + // skips the entry (no live instance was ever resolved), _watched_leak_klass_count stays + // 0, and runPass() declares the search COMPLETED after every pass - and the terminal + // pass itself then releases every frontier tag (releaseSearchTags()) while + // restartSearch() re-runs the identical walk. The frontier-state seam below blocks on + // _engine_lock mid-pass, so it can only read between passes - where the tags are already + // released - and the EXPANDED wait below can never observe its condition (observed as + // "holders never all reached EXPANDED within 45s" with states [-1, -1, -1]). + // The representative MUST be a byte[] chunk - the leaked klass itself - never the + // list holding it: the representative's real klass becomes the candidate klass, and only + // candidate-klass instances get leak-tagged by tagLeakInstances() and recorded by the + // leak-tag interception path whose chains the seam below reads. A non-byte[] + // representative (e.g. LEAK_BUFFER's own SynchronizedList klass, which has no tracked + // instances in this child JVM) mints no leak tags at all, and lateChunk is never + // discovered (observed as 0/6 runs, the seam returning 0 forever). Watching byte[] does + // flood _leak_parent_fanout with unrelated JVM-wide Object[] parents (~9.5k + // entries/search observed), starving the leak-accumulation rotation prong - but discovery + // does not depend on that prong: the static-anchor descend walk re-walks LEAK_BUFFER's + // whole subtree every search and intercepts every leak-tagged chunk in it (observed + // 10/10 searches), so lateChunk's chain is rebuilt once per search generation regardless. + // The seed chunk is held strongly by the static field, so the tracker's weak + // representative ref stays live. + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(LEAK_BUFFER_TEST_KLASS_ID, + LEAK_BUFFER.get(0)); + // Seed hysteresis-qualifying epochs so hasLeakSignal()/shouldRunPass() authorize the BFS + // thread's first pass. Must precede the passesRun() wait below: a pass only runs once + // shouldRunPass() sees a leak signal, so waiting first deadlocks. Per-(klass, tid) seeds + // (see LeakTagCorrelationScenario): the qualifying tid must be the allocating thread, and + // this thread allocates every LEAK_BUFFER chunk. leakTid = ReferenceChainTestHooks.getTid(); for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { - ReferenceChainTestHooks.seedKlassPopulationSample0( - LEAK_BUFFER_TEST_KLASS_ID, epoch * 10, epoch); - ReferenceChainTestHooks.seedTidTrendSample0( - LEAK_BUFFER_TEST_KLASS_ID, leakTid, epoch * 3, epoch); + ReferenceChainTestHooks.seedKlassPopulationSample0(LEAK_BUFFER_TEST_KLASS_ID, epoch * 10, epoch); + ReferenceChainTestHooks.seedTidTrendSample0(LEAK_BUFFER_TEST_KLASS_ID, leakTid, epoch * 3, epoch); } hysteresisEpoch = SEED_EPOCHS_FOR_HYSTERESIS; } - // Wait for the BFS thread to fully complete its own first pass - not just - // admitStaticFieldRoots()'s one-time sweep of LEAK_BUFFER's current contents, but the WHOLE - // pass, sweep and expandFrontier()/collectStaleExpandedEntriesForRotation() alike - strictly - // before this scenario creates the chunk whose chain it watches for. That is the entire - // point: proving that an element appended AFTER the field's List is already EXPANDED gets - // discovered via a LATER re-expansion of that stale entry, not via the first pass that - // admitted it. Waiting on only the static-field sub-step is not enough: admitStaticFieldRoots() - // and expandFrontier() are two steps of the SAME runPass() call, so Java can observe the - // former's completion while the latter - which actually marks LEAK_BUFFER's entry EXPANDED - - // is still in flight. Advancing referenceChainPassesRunForTest0() past its pre-seeding - // snapshot only becomes true once that ENTIRE pass has finished. Non-debug builds have no - // such seam and fall back to a generous sleep - acceptable there because that path never - // pins a specific representative anyway; it just waits on real allocation sampling. + // Wait until LEAK_BUFFER's holders are ReferenceChainTracker-EXPANDED - strictly before this + // scenario creates the one chunk whose chain it is actually going to watch for. This is the + // entire point of this scenario: proving that an element appended to a static field's + // collection AFTER that field's List is already EXPANDED gets discovered via a LATER + // re-expansion of that stale entry, not via the very first pass that admitted it. + // Release (non-DEBUG) builds have no frontier-state seam and fall back to a sleep: they never + // pin a specific representative and rely on much-slower real allocation sampling, so the + // margin changes nothing about what the eventual match proves. if (debugBuild) { - boolean passCompleted = false; - // admitStaticFieldRoots() sweeps every loaded class in one FollowReferences call - a cold - // external JVM's full classpath (thousands of classes) can need several retries against - // pause-time-SLO pacing before one completes without truncating. - for (int i = 0; i < 300 && !passCompleted; i++) { - passCompleted = ReferenceChainTestHooks.referenceChainPassesRunForTest0() != initialPasses; - if (!passCompleted) { + // A changed pass counter alone is not proof that LEAK_BUFFER's holders were expanded: + // truncated passes also bump it, and admitStaticFieldRoots() only processes a bounded + // chunk of classes per call. So the wait synchronizes on the holders' ACTUAL frontier state + // instead: the SynchronizedList, its backing ArrayList and that ArrayList's elementData + // array must all be EXPANDED before lateChunk exists - only then can lateChunk be reached + // exclusively via a later re-expansion. The pass-counter check stays as a precondition + // (and gates the reflective holder reads until the first pass - with its root + // enumeration - has finished). + Field backingListField; + Field elementDataField; + try { + backingListField = + Class.forName("java.util.Collections$SynchronizedList").getDeclaredField("list"); + backingListField.setAccessible(true); + elementDataField = ArrayList.class.getDeclaredField("elementData"); + elementDataField.setAccessible(true); + } catch (ReflectiveOperationException | RuntimeException e) { + throw new IllegalStateException("cannot reach LEAK_BUFFER's backing ArrayList/elementData" + + " - run with --add-opens java.base/java.util=ALL-UNNAMED", e); + } + // admitStaticFieldRoots() sweeps every loaded class - a cold external JVM's full + // JUnit/JMC/Gradle-worker classpath (thousands of classes) can need several retries + // against pause-time-SLO pacing, and the expansion backlog ahead of LEAK_BUFFER's holders + // is FIFO - generous margin for the same reason ExternalProcessReferenceChainTest's own + // budget/pausetarget are raised this far above the in-process test's defaults. Wall-clock + // deadline: the seam reads can contend with a running pass's locks. Not scaled for + // asan/tsan: the parent's 150s launch timeout must still cover this wait + rounds + the 60s + // tail. + long deadline = System.nanoTime() + TimeUnit.SECONDS.toNanos(45); + boolean holdersExpanded = false; + while (!holdersExpanded && System.nanoTime() < deadline) { + holdersExpanded = ReferenceChainTestHooks.referenceChainPassesRunForTest0() != initialPasses + && leakBufferHoldersExpanded(backingListField, elementDataField); + if (!holdersExpanded) { Thread.sleep(100); } } - if (!passCompleted) { + if (!holdersExpanded) { throw new IllegalStateException( - "ReferenceChainTracker never completed its first pass within 30s - cannot safely " - + "create the chunk this scenario is supposed to discover only via a later " - + "re-expansion of an already-EXPANDED static-field entry"); + "LEAK_BUFFER's holders never all reached EXPANDED within 45s (passesRun=" + + ReferenceChainTestHooks.referenceChainPassesRunForTest0() + ", initial=" + initialPasses + + ", frontier states [list, backing ArrayList, elementData]=" + + describeHolderStates(backingListField, elementDataField) + + ") - cannot safely create the chunk this scenario is supposed to discover only " + + "via a later re-expansion of an already-EXPANDED static-field entry"); } } else { Thread.sleep(3000); } - // Snapshotted right after the wait above confirms the first pass has fully completed - any + // Snapshotted right after the wait above confirms the holders are EXPANDED - any // later change (advance, or reset-to-lower via a restart) proves a walk that started strictly // after lateChunk existed. - int passesRunBeforeLateChunk = - debugBuild ? ReferenceChainTestHooks.referenceChainPassesRunForTest0() : -1; - byte[] lateChunk = new byte[CHUNK_BYTES]; - LEAK_BUFFER.add(lateChunk); - - // From here on, seeded incrementally, one epoch per round, rather than as a single upfront - // burst: profiler.execute()'s start() resets Profiler::classMap()'s generation synchronously, - // but LivenessTracker::cleanup_table() only observes that new generation lazily, on the BFS - // thread's first tick - a burst seeded before that tick gets wiped wholesale by the - // class-map-generation mismatch. Seeding one fresh epoch per round is self-healing the same - // way the real leak is: LEAK_BUFFER keeps growing every round regardless of any one-time - // startup housekeeping, so however many rounds a wipe costs, the trend simply resumes. + int passesRunBeforeLateChunk = debugBuild ? ReferenceChainTestHooks.referenceChainPassesRunForTest0() : -1; + // lateChunk is deliberately NOT held in a local: the main thread's stack is a root-walk root, + // so a live local lets the root enumeration admit (and, once the canary candidate aliases to + // byte[] and a GC runs tagLeakInstances(), leak-tag) lateChunk directly - the resulting + // stack-local-rooted chain never resolves into the static-field chain this scenario watches, + // and the pre-existing tag blocks the elementData re-walk from admitting lateChunk under the + // stale entry at all (observed as buildChainEvent "target_tag not in frontier" for the whole + // run). Re-fetch the chunk from LEAK_BUFFER on every use instead - the only durable path to + // it is the static field, so its discovery proves the stale-entry re-expansion. + final int LATE_CHUNK_INDEX = SEED_CHUNKS; + LEAK_BUFFER.add(new byte[CHUNK_BYTES]); + + // From here on, seeded incrementally, one epoch per round below, rather than as a single + // upfront burst - found the hard way: profiler.execute()'s start() resets + // Profiler::classMap()'s generation synchronously, but LivenessTracker::cleanup_table() only + // observes that new generation (and updates its own _last_class_map_generation) lazily, on the + // BFS thread's own first tick. A burst seeded entirely before that first tick lands in + // _klass_population, then gets wiped wholesale the moment that tick's class-map-generation + // mismatch fires (cleanup_table()'s own comment, livenessTracker.cpp). Seeding one fresh epoch + // per round instead is self-healing exactly the way the real leak this scenario mirrors is: + // LEAK_BUFFER keeps growing every round regardless of any one-time startup housekeeping, so + // however many rounds a wipe costs, the trend simply resumes accumulating from the next + // round's seed call. ReferenceChainAssertions.ChainMatch match = null; - int totalRounds = 25; - for (int round = 1; round <= totalRounds && match == null; round++) { - // Continues growing LEAK_BUFFER every round after lateChunk - mirrors the real leak's own - // continuous growth - but lateChunk itself (created above, strictly after the first sweep) - // stays the fixed target this scenario watches for throughout. + for (int round = 1; round <= TOTAL_ROUNDS && match == null; round++) { + // Mirrors the real leak's continuous growth; lateChunk stays the watched target. LEAK_BUFFER.add(new byte[CHUNK_BYTES]); System.gc(); if (match == null && debugBuild) { - // Seeding/polling every round unconditionally is load-bearing: gating this on the - // tracker's own progress creates a deadlock - hasLeakSignal() (which authorizes both a - // first pass and any restart) reads selectLeakCandidates(), which needs a - // continuously-refreshed trend to keep reporting this candidate; stopping the refresh - // mid-search can stall the search with no path back. This scenario's target - a growing - // static-field collection - legitimately produces a continuous real signal in production; - // seeding continuously is what mirrors that, not an artifact to gate away. + // Seeding/polling every round unconditionally (not gated on passesRun() having advanced) + // is load-bearing, found the hard way: gating this on the tracker's OWN progress creates a + // deadlock - ReferenceChainTracker::hasLeakSignal() (which authorizes both a search's first + // pass and any later restart once the search reaches a terminal state) reads + // LivenessTracker::selectLeakCandidates(), which needs a continuously-refreshed population + // trend to keep reporting this candidate; stopping that refresh mid-search (to wait on the + // search's own progress) can stall the search itself with no path back, since nothing else + // keeps re-authorizing it. This scenario's target - a growing static-field collection - + // legitimately produces a continuous real signal in production; seeding continuously here + // is what actually mirrors that, not an artifact to gate away. // - // Kept uncapped (not stopped once the minimum epoch count is reached) so a wipe that - // costs an early round or two still leaves enough remaining rounds to reach it. + // The representative pins lateChunk, not whatever the real sampler picks. Seeding stays + // uncapped past SEED_EPOCHS_FOR_HYSTERESIS so a wipe costing early rounds still leaves + // enough rounds to requalify. hysteresisEpoch++; ReferenceChainTestHooks.seedKlassPopulationSample0( LEAK_BUFFER_TEST_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); ReferenceChainTestHooks.seedTidTrendSample0( LEAK_BUFFER_TEST_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( - LEAK_BUFFER_TEST_KLASS_ID, lateChunk); + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(LEAK_BUFFER_TEST_KLASS_ID, + LEAK_BUFFER.get(LATE_CHUNK_INDEX)); ReferenceChainTestHooks.pollReferenceChainTargets0(); - // Only TRUST a match once passesRun() has changed since the snapshot taken right before - // lateChunk was created - advanced (the same, never-restarted search ran a later pass) or - // reset lower (restartSearch() ran, only possible on a tick strictly after that - // snapshot). Either way proves the match came from a walk that started after lateChunk - // existed, ruling out the still-in-flight first pass finding it by accident. + // Only TRUST a match once passesRun() has genuinely changed since the snapshot taken right + // before lateChunk was created - either advanced (the same, never-restarted search ran a + // later pass) or reset to a lower value (restartSearch() ran, which only ever happens on a + // threadLoop tick strictly after that snapshot, since time only moves forward). Either way + // proves the match came from a walk that started after lateChunk existed, ruling out the + // one race this whole seam exists to rule out: the very first, still-in-flight pass finding + // lateChunk by accident because admitStaticFieldRoots() and expandFrontier() are two steps + // of that SAME call, and Java can observe the former's completion before the latter runs. + // + // The match is pinned to lateChunk's OWN chain: any byte[] chain (the seed chunks created + // before the first pass, discovered instances, other representatives) is not enough. The + // tag is read BEFORE dumping - the dump snapshots the same resolved-chain cache - and a + // round where the current search has not resolved lateChunk's chain yet is skipped. if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() != passesRunBeforeLateChunk) { - profiler.dump(scratchDumpPath); - match = findMatch(scratchDumpPath); + long lateChunkTargetTag = ReferenceChainTestHooks.getReferenceChainResolvedTargetTagForTest0( + LEAK_BUFFER.get(LATE_CHUNK_INDEX)); + if (lateChunkTargetTag != 0) { + profiler.dump(scratchDumpPath); + match = findMatch(scratchDumpPath, lateChunkTargetTag); + } } } + // Release (non-DEBUG) builds have no identity seam: class-only matching, as before. if (match == null && !debugBuild) { profiler.dump(scratchDumpPath); - match = findMatch(scratchDumpPath); + match = findMatch(scratchDumpPath, 0); } if (match == null && !debugBuild) { Thread.sleep(300); profiler.dump(scratchDumpPath); - match = findMatch(scratchDumpPath); + match = findMatch(scratchDumpPath, 0); } } - // A cold external JVM's one-shot root-seeded walk over its whole reachable graph takes far - // longer than the round loop: an earlier tail wait of 5 x 1s gave up and printed NOT_FOUND - // mere moments before the tracker's own pass actually completed and built the chain. - for (int attempt = 0; match == null && attempt < 40; attempt++) { + // A cold external JVM's one-shot root-seeded walk over its whole reachable graph (full + // JUnit/JMC/Gradle-worker classpath) takes far longer than the round loop - a 5 x 1s tail + // gave up moments before runPass() completed and built the chain. + int watchedIndex = -1; + int attemptsOnWatchedChunk = 0; + for (int attempt = 0; match == null && attempt < TAIL_ATTEMPTS; attempt++) { Thread.sleep(1500); - // Same passesRun()-advanced check as the round loop above (debug builds only) - by this - // point it has virtually always already flipped, but there is no reason to drop the - // guarantee. - if (debugBuild - && ReferenceChainTestHooks.referenceChainPassesRunForTest0() == passesRunBeforeLateChunk) { - continue; + // Same passesRun()-changed guard as the round loop. + long requiredTargetTag = 0; + if (debugBuild) { + if (ReferenceChainTestHooks.referenceChainPassesRunForTest0() == passesRunBeforeLateChunk) { + continue; + } + // The tail watches, one at a time, chunks appended to LEAK_BUFFER well after that + // collection was first EXPANDED - exactly the discovery this scenario exists to prove. + // Watching a chunk allocated once at scenario start (lateChunk above) is not durable: + // the whole leak-tag pipeline keys on the chunk's allocation-tracking record, records + // are only minted at allocation, and the tracking table's churn can evict an old + // chunk's record for the rest of the run - observed as the representative resolving + // that chunk correctly but reading tag=0 for 2000+ consecutive polls (no leak tag ever + // minted, so no interception and no chain ever built for it). A FRESHLY appended chunk + // has a guaranteed-live record: the explicit poll below tags it immediately, the next + // static-anchor descend intercepts it, and a later attempt's poll resolves its chain. + // But discovery takes several walk cycles (interception, then a later poll's chain + // build) - measured at more than one 1.5s attempt - so the SAME chunk must stay the + // watched target for several attempts before rotating to a new one; rotating every + // attempt reads a just-allocated chunk that has not matured yet and abandons each + // chunk right before it would resolve (observed as 0/8 runs). If a chunk still has + // not resolved after TAIL_CHUNK_ATTEMPTS attempts, its record most likely died the + // same death lateChunk's can - rotate. Same no-local discipline as lateChunk above: + // each watched chunk is reachable only through LEAK_BUFFER, so any walk that reaches + // it comes through elementData, never through a stack-local root. + if (watchedIndex < 0 || attemptsOnWatchedChunk >= TAIL_CHUNK_ATTEMPTS) { + LEAK_BUFFER.add(new byte[CHUNK_BYTES]); + watchedIndex = LEAK_BUFFER.size() - 1; + attemptsOnWatchedChunk = 0; + } + attemptsOnWatchedChunk++; + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(LEAK_BUFFER_TEST_KLASS_ID, + LEAK_BUFFER.get(watchedIndex)); + ReferenceChainTestHooks.pollReferenceChainTargets0(); + requiredTargetTag = ReferenceChainTestHooks.getReferenceChainResolvedTargetTagForTest0( + LEAK_BUFFER.get(watchedIndex)); + if (requiredTargetTag == 0) { + continue; + } } profiler.dump(scratchDumpPath); - match = findMatch(scratchDumpPath); + match = findMatch(scratchDumpPath, requiredTargetTag); } if (match == null) { @@ -233,7 +385,12 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD System.out.println(FOUND_MARKER + match.chain.get(0).getFullName()); } - private static ReferenceChainAssertions.ChainMatch findMatch(Path scratchDumpPath) throws Exception { + /** + * {@code requiredTargetTag == 0}: the first byte[] chain (class-only, non-debug builds). + * Otherwise: only the byte[] chain whose targetTag identifies that one instance. + */ + private static ReferenceChainAssertions.ChainMatch findMatch(Path scratchDumpPath, + long requiredTargetTag) throws Exception { if (!Files.exists(scratchDumpPath)) { return null; } @@ -241,7 +398,41 @@ private static ReferenceChainAssertions.ChainMatch findMatch(Path scratchDumpPat try (InputStream in = Files.newInputStream(scratchDumpPath)) { events = JfrLoaderToolkit.loadEvents(in); } - return ReferenceChainAssertions.findMatchForClass( - events.apply(ItemFilters.type("datadog.ReferenceChain")), byte[].class); + IItemCollection chains = events.apply(ItemFilters.type("datadog.ReferenceChain")); + return requiredTargetTag == 0 + ? ReferenceChainAssertions.findMatchForClass(chains, byte[].class) + : ReferenceChainAssertions.findMatchForClassAndTargetTag( + chains, byte[].class, requiredTargetTag); + } + + /** + * Frontier states of LEAK_BUFFER, its backing ArrayList and that list's elementData array. + * The holders are fetched fresh on every call and never kept beyond it - a static field or a + * long-lived local would add a second root path to them. + */ + private static int[] holderStates(Field backingListField, Field elementDataField) + throws IllegalAccessException { + Object backing = backingListField.get(LEAK_BUFFER); + Object elementData = elementDataField.get(backing); + return new int[] { + ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(LEAK_BUFFER), + ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(backing), + ReferenceChainTestHooks.getReferenceChainFrontierStateForTest0(elementData) + }; + } + + private static boolean leakBufferHoldersExpanded(Field backingListField, Field elementDataField) + throws IllegalAccessException { + for (int state : holderStates(backingListField, elementDataField)) { + if (state != FRONTIER_STATE_EXPANDED) { + return false; + } + } + return true; + } + + private static String describeHolderStates(Field backingListField, Field elementDataField) + throws IllegalAccessException { + return Arrays.toString(holderStates(backingListField, elementDataField)); } } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakReferenceChainTest.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakReferenceChainTest.java index f72d4fa1ec..b0e631a740 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakReferenceChainTest.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakReferenceChainTest.java @@ -19,6 +19,8 @@ import java.util.List; import java.util.concurrent.atomic.AtomicReference; +import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_BASE; +import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_POOL_SIZE; import static org.junit.jupiter.api.Assertions.assertEquals; import static org.junit.jupiter.api.Assertions.assertNotNull; import static org.junit.jupiter.api.Assertions.assertTrue; @@ -33,19 +35,11 @@ * {@code ThreadLocal} map must still produce a correlated * {@code datadog.ReferenceChain} - {@code targetTag} in the leak-tag pool * range, matched by a {@code datadog.HeapLiveObject} {@code leakTag}. The - * scenario is {@code ThreadLocalLeakScenario}; this test drives it and - * asserts the reported correlation, with a filtered child-log tail embedded - * in any failure message for diagnosability without a redeploy. + * scenario is {@code ThreadLocalLeakScenario}. */ @Tag("slow") public class ThreadLocalLeakReferenceChainTest extends AbstractProcessProfilerTest { - // Mirrored from referenceChains.h (LEAK_TAG_BASE/LEAK_TAG_POOL_SIZE) - the - // contract under test, asserted against the runtime event values the child - // reports. - private static final long LEAK_TAG_BASE = 0x40000000L; - private static final long LEAK_TAG_POOL_SIZE = 256; - @Test void shouldCorrelateThreadLocalHeldLeakChain() throws Exception { assumeFalse(Platform.isJavaVersion(8)); @@ -67,30 +61,35 @@ void shouldCorrelateThreadLocalHeldLeakChain() throws Exception { String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); List jvmArgs = Collections.singletonList( - "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); + "-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); AtomicReference resultLine = new AtomicReference<>(); LaunchResult result = launch("threadlocal-leak", jvmArgs, packedCommand, Collections.emptyMap(), - 150, + childTimeoutSeconds(150), line -> { if (line.startsWith(ThreadLocalLeakScenario.FOUND_MARKER) || line.equals(ThreadLocalLeakScenario.NOT_FOUND_MARKER) || line.startsWith(ThreadLocalLeakScenario.TAG_OUT_OF_POOL_MARKER) - || line.startsWith(ThreadLocalLeakScenario.NO_LIVE_OBJECT_MARKER)) { + || line.startsWith(ThreadLocalLeakScenario.NO_LIVE_OBJECT_MARKER) + || line.equals(ThreadLocalLeakScenario.HANDOFF_TIMEOUT_MARKER)) { resultLine.set(line); } if (line.startsWith("[TEST::INFO]")) { - testLogTail.addLast(line); - while (testLogTail.size() > 2000) { - testLogTail.removeFirst(); + // Synchronized: the reader thread can outlive a join timeout. + synchronized (testLogTail) { + testLogTail.addLast(line); + while (testLogTail.size() > 2000) { + testLogTail.removeFirst(); + } } } return LineConsumerResult.CONTINUE; }, null); - assertTrue(result.inTime, "Child process did not exit within the wait timeout"); + assertTrue(result.inTime, "Child process did not exit within the wait timeout" + + diagnostics(testLogTail)); assertEquals(0, result.exitCode, "Child process exited with a non-zero code"); assertNotNull(resultLine.get(), "Child process never printed a recognizable result " + "marker on stdout" + diagnostics(testLogTail)); @@ -140,30 +139,35 @@ void shouldCorrelateLeakOnThreadCreatedAfterRecordingStart() throws Exception { String packedCommand = startCommand + "|||" + scratchDumpPath.toAbsolutePath(); List jvmArgs = Collections.singletonList( - "-Dddprof_test.config=" + System.getProperty("ddprof_test.config")); + "-Dddprof_test.config=" + ReferenceChainAssertions.requiredTestConfig()); AtomicReference resultLine = new AtomicReference<>(); LaunchResult result = launch("threadlocal-leak-late", jvmArgs, packedCommand, Collections.emptyMap(), - 150, + childTimeoutSeconds(150), line -> { if (line.startsWith(ThreadLocalLeakScenario.FOUND_MARKER) || line.equals(ThreadLocalLeakScenario.NOT_FOUND_MARKER) || line.startsWith(ThreadLocalLeakScenario.TAG_OUT_OF_POOL_MARKER) - || line.startsWith(ThreadLocalLeakScenario.NO_LIVE_OBJECT_MARKER)) { + || line.startsWith(ThreadLocalLeakScenario.NO_LIVE_OBJECT_MARKER) + || line.equals(ThreadLocalLeakScenario.HANDOFF_TIMEOUT_MARKER)) { resultLine.set(line); } if (line.startsWith("[TEST::INFO]")) { - testLogTail.addLast(line); - while (testLogTail.size() > 2000) { - testLogTail.removeFirst(); + // Synchronized: the reader thread can outlive a join timeout. + synchronized (testLogTail) { + testLogTail.addLast(line); + while (testLogTail.size() > 2000) { + testLogTail.removeFirst(); + } } } return LineConsumerResult.CONTINUE; }, null); - assertTrue(result.inTime, "Child process did not exit within the wait timeout"); + assertTrue(result.inTime, "Child process did not exit within the wait timeout" + + diagnostics(testLogTail)); assertEquals(0, result.exitCode, "Child process exited with a non-zero code"); assertNotNull(resultLine.get(), "Child process never printed a recognizable result " + "marker on stdout" + diagnostics(testLogTail)); @@ -177,14 +181,12 @@ void shouldCorrelateLeakOnThreadCreatedAfterRecordingStart() throws Exception { } } - /** - * A filtered summary of the child's TEST_LOG stream for failure messages - - * same first-things-to-check selection as - * LeakTagCorrelationReferenceChainTest.diagnostics(): the thread-walk and - * pass summaries (the new machinery this scenario exercises), the gotw - * batch-size trace, and any leak-tag interception or correlation lines. - */ - private static String diagnostics(Deque testLogTail) { + /** Filtered summary of the child's TEST_LOG stream, embedded in failure messages. */ + private static String diagnostics(Deque testLogTailRef) { + List testLogTail; + synchronized (testLogTailRef) { + testLogTail = new ArrayList<>(testLogTailRef); + } if (testLogTail.isEmpty()) { return "\n(no TEST_LOG output captured - non-debug build or no reference-chain passes ran)"; } diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java index c99dde097b..5f7fb799bf 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/ThreadLocalLeakScenario.java @@ -13,6 +13,7 @@ import org.openjdk.jmc.common.item.IItemIterable; import org.openjdk.jmc.common.item.IMemberAccessor; import org.openjdk.jmc.common.item.IType; +import org.openjdk.jmc.common.item.ItemFilters; import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit; import java.io.InputStream; @@ -24,6 +25,9 @@ import java.util.concurrent.BlockingQueue; import java.util.concurrent.TimeUnit; +import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_BASE; +import static com.datadoghq.profiler.referencechains.ReferenceChainAssertions.LEAK_TAG_POOL_SIZE; + /** * The thread-local taxonomy of the leak-tag correlation use case, run inside a * separate child JVM by {@code ExternalLauncher}'s {@code threadlocal-leak} mode: @@ -53,10 +57,9 @@ public final class ThreadLocalLeakScenario { private ThreadLocalLeakScenario() {} /** - * The leak sink: a per-thread growing list, touched ONLY by the leaking - * thread below. Deliberately NOT static-retained anywhere - the whole - * point is that the only durable path to the chunks runs through the - * leaking thread's ThreadLocalMap. + * The leak sink, touched ONLY by the leaking thread. Deliberately NOT + * static-retained: the only durable path to the chunks must run through + * the leaking thread's ThreadLocalMap. */ private static final ThreadLocal> SINK = ThreadLocal.withInitial(() -> new ArrayList<>()); @@ -82,10 +85,6 @@ private ThreadLocalLeakScenario() {} */ private static final int CHUNK_BYTES = 1_000_000; - // Mirrored from referenceChains.h (LEAK_TAG_BASE/LEAK_TAG_POOL_SIZE). - private static final long LEAK_TAG_BASE = 0x40000000L; - private static final long LEAK_TAG_POOL_SIZE = 256; - /** * Handoff for the leak thread's profiler tid and one seed chunk - the * main thread seeds LivenessTracker's per-(klass, tid) qualification with @@ -109,12 +108,10 @@ byte[] take() { } /** - * Bounded wait for the leak thread's first publish. Both modes need it: - * in the late-thread mode the thread is started only after - * {@code profiler.execute()} returned, and in the default mode the leak - * thread must still allocate {@code SEED_CHUNKS} chunks before it - * publishes - so neither mode can assume publication has happened by the - * time the main thread seeds. + * Required in both thread-start modes: neither starting the thread + * before {@code profiler.execute()} nor after it guarantees it has + * published by the time run() consumes the handoff. Must be called + * before take() (it polls seedChunk, which take() clears). */ boolean awaitPublication(long timeoutMs) throws InterruptedException { long deadline = System.nanoTime() @@ -138,9 +135,17 @@ boolean awaitPublication(long timeoutMs) throws InterruptedException { /** Printed to stdout (with the tag) if no HeapLiveObject matched the chain's tag. */ public static final String NO_LIVE_OBJECT_MARKER = "[tl-correlation-no-live-object] "; + /** + * Printed to stdout if the leak thread never published its tid and seed chunk - a fixture + * failure, reported apart from a correlation miss. + */ + public static final String HANDOFF_TIMEOUT_MARKER = "[tl-correlation-handoff-timeout]"; + private static final class ScanResult { ReferenceChainAssertions.ChainMatch payloadChain; boolean payloadChainInPool; + // ReferenceChain.leakTagIncarnation of payloadChain; -1 when the field is absent. + long payloadChainIncarnation = -1; int liveObjectMatchesForChainTag; } @@ -179,17 +184,22 @@ public static void run(JavaProfiler profiler, String startCommand, // always allocated on the same qualifying tid). BlockingQueue rounds = new ArrayBlockingQueue<>(32); Thread leakThread = new Thread(() -> { - List sink = SINK.get(); + // No local ever holds the sink: re-fetch it via SINK on every use so + // the only durable path to the chunks is Thread.threadLocals -> + // ThreadLocalMap. A live stack local would let root enumeration reach + // ArrayList -> elementData -> byte[] directly (a depth-2 stack-local + // chain the transient-root gate does not suppress), bypassing the + // thread-scoped walk this scenario exists to prove. for (int i = 0; i < SEED_CHUNKS; i++) { - sink.add(new byte[CHUNK_BYTES]); + SINK.get().add(new byte[CHUNK_BYTES]); } - handoff.publish(ReferenceChainTestHooks.getTid(), sink.get(0)); + handoff.publish(ReferenceChainTestHooks.getTid(), SINK.get().get(0)); while (true) { try { if (rounds.poll(50, TimeUnit.MILLISECONDS) == null) { continue; } - sink.add(new byte[CHUNK_BYTES]); + SINK.get().add(new byte[CHUNK_BYTES]); } catch (InterruptedException e) { return; } @@ -207,32 +217,26 @@ public static void run(JavaProfiler profiler, String startCommand, if (lateThread) { leakThread.start(); } - // The debug seeding below consumes the handoff immediately; in both modes - // the leak thread must first allocate SEED_CHUNKS chunks before it - // publishes, so wait (bounded) for its first publish rather than race it. if (!handoff.awaitPublication(30000)) { - System.out.println(NOT_FOUND_MARKER); + System.out.println(HANDOFF_TIMEOUT_MARKER); return; } - boolean debugBuild = "debug".equals(System.getProperty("ddprof_test.config")); + boolean debugBuild = ReferenceChainAssertions.isDebugInstrumentedBuild(); int leakTid = 0; if (debugBuild) { - // Representative first, seeds second - same aliasing rationale as - // LeakTagCorrelationScenario (the rep's real klass id must own the - // seeds or the seeds authorize nothing). The rep chunk stays durably - // reachable only through the leak thread's ThreadLocalMap - the - // take() above dropped this handoff's reference. - ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( - LEAK_KLASS_ID, handoff.take()); + // Representative first, seeds second: the rep's real klass id must + // own the seeds or they authorize nothing. take() drops the handoff's + // reference, so the rep chunk stays reachable only via ThreadLocalMap. + ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0(LEAK_KLASS_ID, handoff.take()); leakTid = handoff.tid; for (int epoch = 1; epoch <= SEED_EPOCHS_FOR_HYSTERESIS; epoch++) { ReferenceChainTestHooks.seedKlassPopulationSample0(LEAK_KLASS_ID, epoch * 10, epoch); ReferenceChainTestHooks.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, epoch * 3, epoch); } - // Continue the rising epoch sequence past the seeded range so each - // per-round maintenance seed below pushes a fresh, strictly increasing - // epoch (same as StaticFieldGrowingCollectionScenario). + // Maintenance continues the seeded ramp (next epoch = + // SEED_EPOCHS_FOR_HYSTERESIS + 1) instead of restarting at 1 - same as + // StaticFieldGrowingCollectionScenario. hysteresisEpoch = SEED_EPOCHS_FOR_HYSTERESIS; // Wait for the BFS thread's first full pass, then poll - same // load-bearing wait as LeakTagCorrelationScenario. @@ -245,6 +249,10 @@ public static void run(JavaProfiler profiler, String startCommand, } ReferenceChainTestHooks.pollReferenceChainTargets0(); } else { + // Drop the handoff's chunk reference: the lambda (captured by the + // Thread's runnable) retains `handoff`, so a never-taken seedChunk + // would be a second, non-ThreadLocalMap path to a chunk. + handoff.take(); Thread.sleep(5000); } @@ -258,8 +266,7 @@ public static void run(JavaProfiler profiler, String startCommand, hysteresisEpoch++; ReferenceChainTestHooks.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - ReferenceChainTestHooks.seedTidTrendSample0( - LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); + ReferenceChainTestHooks.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); } Thread.sleep(300); System.gc(); @@ -283,8 +290,7 @@ public static void run(JavaProfiler profiler, String startCommand, hysteresisEpoch++; ReferenceChainTestHooks.seedKlassPopulationSample0( LEAK_KLASS_ID, hysteresisEpoch * 10, hysteresisEpoch); - ReferenceChainTestHooks.seedTidTrendSample0( - LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); + ReferenceChainTestHooks.seedTidTrendSample0(LEAK_KLASS_ID, leakTid, hysteresisEpoch * 3, hysteresisEpoch); } if (!rounds.offer(attempt)) { throw new IllegalStateException( @@ -311,39 +317,48 @@ public static void run(JavaProfiler profiler, String startCommand, System.out.println(FOUND_MARKER + best.payloadChain.targetTag); } - /** - * Monotonic: never downgrades an already better result (e.g. a fully - * correlated in-pool chain) to a later out-of-pool/unmatched scan; at equal - * quality the newer scan wins. - */ + private static boolean passesThroughThreadLocalMap(Object[] rawChain) { + for (Object element : rawChain) { + if (element instanceof IMCType) { + String name = ((IMCType) element).getFullName(); + if (name != null && name.contains("ThreadLocalMap")) { + return true; + } + } + } + return false; + } + private static ScanResult keepBest(ScanResult best, ScanResult scan) { if (scan == null) { return best; } - if (best == null) { + // Unlike LeakTagCorrelationScenario.keepBest, the losing scan has nothing + // to merge: this scenario's ScanResult carries no transient/noise evidence + // (that is LeakTagCorrelation's contract), and a scan without a payload + // chain has no other populated field worth keeping. If evidence fields are + // ever added here, merge them like LeakTagCorrelationScenario's mergeDistinct. + if (best == null || best.payloadChain == null) { return scan; } - return quality(scan) >= quality(best) ? scan : best; - } - - /** 0: no chain, 1: out-of-pool chain, 2: in-pool chain, 3: in-pool and correlated. */ - private static int quality(ScanResult r) { - if (r == null || r.payloadChain == null) { - return 0; + if (scan.payloadChain == null) { + return best; } - if (!r.payloadChainInPool) { - return 1; + // Mirror scan()'s own within-scan preference: an in-pool (correlated) + // chain outranks an out-of-pool one no matter which scan observed it, so + // a later out-of-pool chain cannot displace an earlier correlated one. + if (best.payloadChainInPool != scan.payloadChainInPool) { + return best.payloadChainInPool ? best : scan; } - return r.liveObjectMatchesForChainTag > 0 ? 3 : 2; + return scan; } /** - * Scans one dump: the first leaked {@code byte[]} chain (if any), whether - * its targetTag is in the leak-tag pool, and how many - * {@code datadog.HeapLiveObject} events for a leaked {@code byte[]} carry - * that same tag in {@code leakTag}. Simplified from - * LeakTagCorrelationScenario.scan() - no transient/noise gate scans (those - * are that scenario's own contracts). + * Scans one dump for a leaked {@code byte[]} chain through a ThreadLocalMap + * hop, whether its targetTag is in the leak-tag pool, and how many + * {@code datadog.HeapLiveObject} {@code byte[]} events carry that tag in + * {@code leakTag}. No transient/noise gate scans - those are + * LeakTagCorrelationScenario's contracts. */ private static ScanResult scan(Path scratchDumpPath) throws Exception { if (!Files.exists(scratchDumpPath)) { @@ -356,13 +371,15 @@ private static ScanResult scan(Path scratchDumpPath) throws Exception { ScanResult result = new ScanResult(); IItemCollection chains = events.apply( - org.openjdk.jmc.common.item.ItemFilters.type("datadog.ReferenceChain")); + ItemFilters.type("datadog.ReferenceChain")); for (IItemIterable iterable : chains) { IType type = iterable.getType(); IMemberAccessor chainAccessor = ReferenceChainAssertions.findAccessor(type, "chain"); IMemberAccessor targetTagAccessor = ReferenceChainAssertions.findAccessor(type, "targetTag"); + IMemberAccessor incarnationAccessor = + ReferenceChainAssertions.findAccessor(type, "leakTagIncarnation"); for (IItem item : iterable) { Object chainValue = chainAccessor.getMember(item); if (!(chainValue instanceof Object[])) { @@ -376,6 +393,13 @@ private static ScanResult scan(Path scratchDumpPath) throws Exception { if (!"byte[]".equals(leaf)) { continue; } + // Only a chain through the leaking thread's ThreadLocalMap proves the + // thread-scoped walk; any other byte[] chain must not satisfy this + // scenario (with thread registration broken it would be the only + // kind of chain left, and the scenario must report NOT_FOUND). + if (!passesThroughThreadLocalMap(rawChain)) { + continue; + } boolean inPool = targetTag >= LEAK_TAG_BASE && targetTag < LEAK_TAG_BASE + LEAK_TAG_POOL_SIZE; // Prefer the first in-pool (correlated) chain over any out-of-pool @@ -388,23 +412,61 @@ private static ScanResult scan(Path scratchDumpPath) throws Exception { } result.payloadChain = new ReferenceChainAssertions.ChainMatch(chain, targetTag, 0); result.payloadChainInPool = inPool; + // The (tag, incarnation) pair is the chain's identity; an unresolved + // -1 stamp must fail loud rather than degrade to tag-only matching, + // which a recycled tag's chunk could satisfy. + if (incarnationAccessor == null) { + throw new IllegalStateException( + "datadog.ReferenceChain events have no leakTagIncarnation accessor"); + } + long chainIncarnation = + ReferenceChainAssertions.numberValue(incarnationAccessor.getMember(item)); + if (chainIncarnation == -1) { + throw new IllegalStateException( + "chain leakTagIncarnation is not a numeric value; " + + "tag-only correlation is ambiguous across recycled tags"); + } + result.payloadChainIncarnation = chainIncarnation; } } } if (result.payloadChainInPool) { IItemCollection liveObjects = events.apply( - org.openjdk.jmc.common.item.ItemFilters.type("datadog.HeapLiveObject")); + ItemFilters.type("datadog.HeapLiveObject")); for (IItemIterable iterable : liveObjects) { IType type = iterable.getType(); IMemberAccessor leakTagAccessor = ReferenceChainAssertions.findAccessor(type, "leakTag"); IMemberAccessor objectClassAccessor = ReferenceChainAssertions.findAccessor(type, "objectClass"); + IMemberAccessor incarnationAccessor = + ReferenceChainAssertions.findAccessor(type, "leakTagIncarnation"); + // Fail loud if either identity field is missing: without the tag, every + // live object reads -1 and never matches the chain's targetTag; without + // the incarnation, the match degrades to tag-only, which a recycled + // tag's stale chunk could satisfy. Both must surface as errors, not as + // an empty correlation with no diagnostic. + if (incarnationAccessor == null) { + throw new IllegalStateException( + "datadog.HeapLiveObject events have no leakTagIncarnation accessor"); + } + if (leakTagAccessor == null) { + throw new IllegalStateException( + "datadog.HeapLiveObject events have no leakTag accessor"); + } for (IItem item : iterable) { - long leakTag = leakTagAccessor != null - ? ReferenceChainAssertions.numberValue(leakTagAccessor.getMember(item)) : -1; - if (leakTag != result.payloadChain.targetTag) { + long leakTag = + ReferenceChainAssertions.numberValue(leakTagAccessor.getMember(item)); + long incarnation = + ReferenceChainAssertions.numberValue(incarnationAccessor.getMember(item)); + // Leak tags are recycled: the tag alone is ambiguous across chunks. + // An unresolved -1 incarnation is a hard mismatch, never a tag-only + // match: a stale chunk that inherited the recycled tag must not + // count as this chain's live object. + if (incarnation == -1 + || leakTag != result.payloadChain.targetTag + || incarnation != result.payloadChainIncarnation) { continue; } Object objectClass = objectClassAccessor != null From 30c6d98597e37757eeebe95fb8c5f5ee54b7ae33 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Tue, 20 Oct 2026 11:36:46 +0200 Subject: [PATCH 11/17] Keep the chaos antagonist's population growing past the cap; cap repro snapshot retention A cache that freezes at CAP_ENTRIES reads a ~zero population slope for the rest of a long run, so the antagonist now recycles 25% of the cap and regrows instead. The run-forever repro keeps only the last 5 periodic snapshots so multi-hour sessions cannot fill the temp dir. --- .../chaos/ReferenceChainLeakAntagonist.java | 73 ++++++++++++------- .../repro/ReferenceChainLeakDemo.java | 21 +++++- 2 files changed, 68 insertions(+), 26 deletions(-) diff --git a/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java b/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java index 81e12bffc7..99db2303f1 100644 --- a/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java +++ b/ddprof-stresstest/src/chaos/java/com/datadoghq/profiler/chaos/ReferenceChainLeakAntagonist.java @@ -14,12 +14,18 @@ import java.util.concurrent.ConcurrentHashMap; /** - * Grows an ever-referenced, never-evicted cache to give the reference-chains + * Grows an ever-referenced cache to give the reference-chains * feature (LivenessTracker/ReferenceChainTracker) a real, steadily growing - * population to detect and walk. Growth is capped, not open-ended: once - * {@link #CAP_ENTRIES} is reached the cache stops growing and the antagonist - * just holds it there for the rest of the run, so a long chaos duration - * (hours) still produces the same bounded leak instead of eventually OOMing + * population to detect and walk. Memory stays bounded: once the live entry + * count reaches {@link #CAP_ENTRIES} the antagonist switches to a bounded + * recycle cycle - it evicts the oldest {@link #RECYCLE_EVICT_ENTRIES} entries + * and then regrows to the cap - so the population keeps going through rising + * legs for the whole run instead of freezing at a flat count (a cache that + * grows to a fixed size and then sits flat stops being a growing population: + * the trend detection's earliest-vs-recent ring comparison reads a ~zero slope + * and the feature gets no leak signal for the rest of a multi-hour run). The + * recycle fraction keeps at least 3/4 of the cap alive at all times, so a long + * chaos duration still produces a bounded leak instead of eventually OOMing * the JVM out from under the other antagonists sharing its heap. * *

      Same object shape as {@code LeakingCacheScenario.CachedPayload} @@ -30,12 +36,18 @@ */ public final class ReferenceChainLeakAntagonist implements Antagonist { - // ~64MiB of CachedEntry payloads at steady state (entries are a little + // ~64MiB of CachedEntry payloads at the cap (entries are a little // over 300 bytes with object header/field overhead) — enough for the // liveness tracker's population-growth trend detection to have a real, // sustained trend to lock onto, without meaningfully competing with the // other antagonists' own memory budget for the run's whole duration. private static final int CAP_ENTRIES = 200_000; + + // Entries evicted per recycle cycle once the cap is reached (25% of the + // cap): large enough that each regrow leg is a visible rising population + // trend, small enough that 3/4 of the population stays alive at all times. + private static final int RECYCLE_EVICT_ENTRIES = 50_000; + private static final int BATCH_SIZE = 200; private static final long BATCH_INTERVAL_MS = 50L; @@ -43,6 +55,8 @@ public final class ReferenceChainLeakAntagonist implements Antagonist { private volatile boolean running; private Thread growthDriver; private long nextKey; + private long evictKey; + private long liveEntries; @Override public String name() { @@ -68,28 +82,37 @@ public void stopGracefully(Duration timeout) { } private void growthLoop() { - // nextKey, not cache.size(): ConcurrentHashMap.size() sums every counter cell, too - // costly per put. Equivalent here - this thread is the only writer, keys are unique - // and nothing is ever removed, so nextKey always equals the entry count. - while (running && nextKey < CAP_ENTRIES) { - for (int i = 0; i < BATCH_SIZE && nextKey < CAP_ENTRIES; i++) { - String key = "refchain-leak-" + (nextKey++); - cache.put(key, new CachedEntry(key)); - MemoryGovernor.pace(); + // liveEntries, not cache.size(): ConcurrentHashMap.size() sums every counter cell, too + // costly per put/remove. Exact here - this thread is the only writer, keys are unique + // and evictions only remove what a previous put added, so the counter always matches. + while (running) { + if (liveEntries >= CAP_ENTRIES) { + // Cap reached: recycle phase - evict the oldest entries, then the loop's + // growth phase regrows them with fresh keys, giving the population trend + // detection a repeated rising signal instead of a flat count. + long evictTarget = Math.min(evictKey + RECYCLE_EVICT_ENTRIES, nextKey); + for (; running && evictKey < evictTarget; evictKey++) { + cache.remove("refchain-leak-" + evictKey); + liveEntries--; + MemoryGovernor.pace(); + } } - try { - Thread.sleep(BATCH_INTERVAL_MS); - } catch (InterruptedException e) { - Thread.currentThread().interrupt(); - return; + while (running && liveEntries < CAP_ENTRIES) { + for (int i = 0; i < BATCH_SIZE && liveEntries < CAP_ENTRIES; i++) { + String key = "refchain-leak-" + (nextKey++); + cache.put(key, new CachedEntry(key)); + liveEntries++; + MemoryGovernor.pace(); + } + try { + Thread.sleep(BATCH_INTERVAL_MS); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + return; + } } - } - // Cap reached: keep the reference alive (do nothing) for the rest of - // the run instead of exiting the thread, so `cache` stays reachable - // via this antagonist's own field for as long as the harness runs. - while (running) { try { - Thread.sleep(1_000L); + Thread.sleep(BATCH_INTERVAL_MS); } catch (InterruptedException e) { Thread.currentThread().interrupt(); return; diff --git a/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java b/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java index e4a592c688..7d1df6162a 100644 --- a/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java +++ b/ddprof-stresstest/src/repro/java/com/datadoghq/profiler/repro/ReferenceChainLeakDemo.java @@ -10,8 +10,10 @@ package com.datadoghq.profiler.repro; import com.datadoghq.profiler.JavaProfiler; +import java.io.IOException; import java.lang.management.ManagementFactory; import java.lang.management.MemoryUsage; +import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.HashMap; @@ -95,6 +97,11 @@ public final class ReferenceChainLeakDemo { // call, not just this app's own memory growth, is load-bearing for the repro. private static final int DUMP_EVERY_N_ROUNDS = 10; + // Periodic snapshot files kept in the default run-forever mode (see the dump block in + // run()): older periodic snapshots are deleted once this many newer ones exist, so a + // multi-hour manual session cannot fill /tmp with full-window dumps. + private static final int KEEP_PERIODIC_SNAPSHOTS = 5; + private static final String USAGE = "usage: ReferenceChainLeakDemo [duration-seconds] " + "(both required args must match the -agentpath:=...jfr,file= values; " @@ -147,7 +154,7 @@ private static long parseDurationSeconds(String arg) { private static long totalRoundNanos = 0; private static long maxRoundNanos = 0; - private static void run(Map cache, Path recordingPath, String agentSoPath, long durationSeconds) throws InterruptedException { + private static void run(Map cache, Path recordingPath, String agentSoPath, long durationSeconds) throws InterruptedException, IOException { // Must differ from recordingPath itself - see SNAPSHOT_SUFFIX's comment. Final // (bounded-run) drain target; periodic drains use snapshotPath + "." + round. Path snapshotPath = recordingPath.resolveSibling(recordingPath.getFileName() + SNAPSHOT_SUFFIX); @@ -211,6 +218,18 @@ private static void run(Map cache, Path recordingPath, Stri Path roundSnapshotPath = snapshotPath.resolveSibling(snapshotPath.getFileName() + "." + round); profiler.dump(roundSnapshotPath); + // Run-forever mode writes a new snapshot every DUMP_EVERY_N_ROUNDS rounds and + // each dump contains the full recording window, so unbounded retention fills + // /tmp during long manual repro sessions. Keep only the most recent + // KEEP_PERIODIC_SNAPSHOTS periodic snapshots; the bounded-run .snapshot dump + // (the path the sweep scripts read) is never touched. + if (durationSeconds < 0) { + long expireRound = round - (long) KEEP_PERIODIC_SNAPSHOTS * DUMP_EVERY_N_ROUNDS; + if (expireRound > 0) { + Files.deleteIfExists(snapshotPath.resolveSibling( + snapshotPath.getFileName() + "." + expireRound)); + } + } System.out.println("[repro] dumped " + roundSnapshotPath); } From 05e4a377e262c4105bc47ae8500a959d75083ad7 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Tue, 20 Oct 2026 11:36:46 +0200 Subject: [PATCH 12/17] Fix the refchains sweep scripts' aggregation and bash 3.2 compatibility Aggregate every .jfr.snapshot. file (a drained event is written once, so the final snapshot alone undercounts chains), drop the swept knob from fixed REFCHAINS_ARGS before each run (last-occurrence-wins would shadow it), guard the safepoint pipelines with || true under pipefail, and replace the associative array with a case function for macOS bash 3.2. --- utils/compare-refchains-repro.sh | 12 +++++-- utils/sweep-refchains-all.sh | 61 ++++++++++++++++++++++---------- utils/sweep-refchains-budgets.sh | 31 +++++++++++++++- 3 files changed, 82 insertions(+), 22 deletions(-) diff --git a/utils/compare-refchains-repro.sh b/utils/compare-refchains-repro.sh index 1fa8a43045..7d0579e658 100755 --- a/utils/compare-refchains-repro.sh +++ b/utils/compare-refchains-repro.sh @@ -93,14 +93,22 @@ parse_variant() { # no per-name "Safepoint" prefix, value already in seconds not ns) # Try the ns-based JDK17+ shape first; fall back to the seconds-based one. local stw_stats + # Every pipeline tolerates "no match" (`|| true`): under set -euo pipefail a + # JDK <=16 log (no JDK 17+ "Safepoint ... Total: N ns" shape) or a crashed + # variant's missing safepoint log would otherwise abort parse_variant inside + # the command substitution before the <=16 fallback below could run - the + # same guard sweep-refchains-all.sh/sweep-refchains-budgets.sh carry on + # these identical pipelines. stw_stats=$(grep -oE 'Safepoint "[^"]+".*Total: [0-9]+ ns' "${safepoint_log}" 2>/dev/null \ | grep -oE 'Total: [0-9]+ ns' \ | grep -oE '[0-9]+' \ - | awk '{sec=$1/1e9; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + | awk '{sec=$1/1e9; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}' \ + || true) if [ -z "${stw_stats}" ]; then stw_stats=$(grep -oE 'Total time for which application threads were stopped: [0-9.]+ seconds' "${safepoint_log}" 2>/dev/null \ | grep -oE '[0-9.]+' \ - | awk '{sec=$1; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}') + | awk '{sec=$1; sum+=sec; if(sec>max) max=sec; n+=1} END {if(n>0) printf "%d %.4f %.4f %.4f", n, sum, sum/n, max}' \ + || true) fi read -r stw_count stw_total stw_avg stw_max <<< "${stw_stats:-0 0 0 0}" diff --git a/utils/sweep-refchains-all.sh b/utils/sweep-refchains-all.sh index a38d286994..d8e4903b26 100644 --- a/utils/sweep-refchains-all.sh +++ b/utils/sweep-refchains-all.sh @@ -61,12 +61,20 @@ fixed_args_without() { } KNOBS=(budget firstpassbudget pausetarget painbudget) -declare -A KNOB_VALUES=( - [budget]="${REFCHAINS_SWEEP_BUDGET_VALUES:-1000,4000,10000,40000,100000}" - [firstpassbudget]="${REFCHAINS_SWEEP_FIRSTPASSBUDGET_VALUES:-2000,10000,50000,200000}" - [pausetarget]="${REFCHAINS_SWEEP_PAUSETARGET_VALUES:-50,100,250,500,1000}" - [painbudget]="${REFCHAINS_SWEEP_PAINBUDGET_VALUES:-10,50,100,500,1000}" -) + +# Per-knob sweep value lists (env-overridable). A function + case instead of an +# associative array: macOS ships /bin/bash 3.2, which has no `declare -A`, and +# run-refchains-repro.sh (which this script drives) deliberately supports it - +# same ${var,,}-free, ${arr[@]+...}-guarded discipline as the sibling scripts. +knob_values() { + case "$1" in + budget) printf '%s' "${REFCHAINS_SWEEP_BUDGET_VALUES:-1000,4000,10000,40000,100000}" ;; + firstpassbudget) printf '%s' "${REFCHAINS_SWEEP_FIRSTPASSBUDGET_VALUES:-2000,10000,50000,200000}" ;; + pausetarget) printf '%s' "${REFCHAINS_SWEEP_PAUSETARGET_VALUES:-50,100,250,500,1000}" ;; + painbudget) printf '%s' "${REFCHAINS_SWEEP_PAINBUDGET_VALUES:-10,50,100,500,1000}" ;; + *) return 1 ;; + esac +} WORKDIR="$(mktemp -d /tmp/refchains_sweep_all.XXXXXX)" CSV="${WORKDIR}/sweep.csv" @@ -76,7 +84,7 @@ GC_DESC="${REFCHAINS_GC:-JVM ergonomic default}" TOTAL_RUNS=0 for k in "${KNOBS[@]}"; do - IFS=',' read -r -a vals <<< "${KNOB_VALUES[${k}]}" + IFS=',' read -r -a vals <<< "$(knob_values "${k}")" TOTAL_RUNS=$((TOTAL_RUNS + ${#vals[@]})) done @@ -126,26 +134,41 @@ parse_run() { read -r stw_count stw_total stw_avg stw_max <<< "${stw_stats:-0 0 0 0}" # jfr print/summary require a ".jfr" extension - the repro app's periodic - # dump target (".snapshot", see ReferenceChainLeakDemo's own header - # comment on SNAPSHOT_SUFFIX) doesn't have one, so copy it under a .jfr - # name before handing it to refchains-jfr-metrics.py. - local snapshot="${WORKDIR}/${label}.jfr.snapshot" + # dump targets (".snapshot" and ".snapshot.", see + # ReferenceChainLeakDemo's own header comment on SNAPSHOT_SUFFIX) don't have + # one, so copy each under a .jfr name before handing it to + # refchains-jfr-metrics.py. + # + # A drained chain event is written exactly once, into whichever snapshot file + # was current at its dump - so the final bare ".jfr.snapshot" holds only the + # chains drained after the last periodic dump, and reading it alone + # undercounts chain_count/abandoned_count (often to 0/-1). Aggregate every + # snapshot file of this run: counts summed, time-to-first-chain taken as the + # smallest non-negative value (the earliest chain observed anywhere). + local snapshot_base="${WORKDIR}/${label}.jfr.snapshot" local chain_count=0 abandoned_count=0 time_to_first_chain_s=-1 - if [ -f "${snapshot}" ]; then - local tmp_jfr="${WORKDIR}/${label}.metrics.jfr" - cp "${snapshot}" "${tmp_jfr}" - local chain_stats - chain_stats=$(python3 "${HERE}/refchains-jfr-metrics.py" "${tmp_jfr}" 2>/dev/null || echo "0 0 -1") - read -r chain_count abandoned_count time_to_first_chain_s <<< "${chain_stats}" + local snap tmp_jfr per_stats per_count per_abandoned per_ttf + for snap in "${snapshot_base}" "${snapshot_base}".*; do + [ -f "${snap}" ] || continue + tmp_jfr="${WORKDIR}/${label}.metrics.jfr" + cp "${snap}" "${tmp_jfr}" + per_stats=$(python3 "${HERE}/refchains-jfr-metrics.py" "${tmp_jfr}" 2>/dev/null || echo "0 0 -1") + read -r per_count per_abandoned per_ttf <<< "${per_stats}" + chain_count=$((chain_count + ${per_count:-0})) + abandoned_count=$((abandoned_count + ${per_abandoned:-0})) + if [ "${per_ttf:--1}" -ge 0 ] \ + && { [ "${time_to_first_chain_s}" -lt 0 ] || [ "${per_ttf}" -lt "${time_to_first_chain_s}" ]; }; then + time_to_first_chain_s="${per_ttf}" + fi rm -f "${tmp_jfr}" - fi + done echo "${entries_per_sec:-0} ${avg_round_ms:-0} ${max_round_ms:-0} ${heap_growth_mb:-0} ${stw_count} ${stw_total} ${stw_avg} ${stw_max} ${peak_rss_kb} ${wall_seconds:-0} ${chain_count} ${abandoned_count} ${time_to_first_chain_s}" } run_idx=0 for knob in "${KNOBS[@]}"; do - IFS=',' read -r -a vals <<< "${KNOB_VALUES[${knob}]}" + IFS=',' read -r -a vals <<< "$(knob_values "${knob}")" for value in "${vals[@]}"; do run_idx=$((run_idx + 1)) label="${knob}_${value}" diff --git a/utils/sweep-refchains-budgets.sh b/utils/sweep-refchains-budgets.sh index e25049c274..e89c10765a 100644 --- a/utils/sweep-refchains-budgets.sh +++ b/utils/sweep-refchains-budgets.sh @@ -59,6 +59,34 @@ echo "GC: ${GC_DESC}" echo "Duration per point: ${DURATION_SECONDS}s" echo "Working directory: ${WORKDIR}" +# Caller's fixed sub-options, captured once: REFCHAINS_ARGS itself is rebuilt +# per run below (swept knob + these). +FIXED_REFCHAINS_ARGS="${REFCHAINS_ARGS:-}" + +# Prints FIXED_REFCHAINS_ARGS minus any "=..." entry (key matched +# case-insensitively, like arguments.cpp), warning on stderr for each one +# dropped - stdout is the result, captured by the caller. Without this, a fixed +# entry for the swept knob would be appended AFTER the swept "=" +# and arguments.cpp's last-occurrence-wins parsing would silently run every +# sweep point with the fixed value, rendering a flat, misleading curve (the +# sibling sweep-refchains-all.sh has the same guard). +fixed_args_without() { + local drop="$1" out="" kv key + local parts=() + if [ -n "${FIXED_REFCHAINS_ARGS}" ]; then + IFS=':' read -r -a parts <<< "${FIXED_REFCHAINS_ARGS}" + fi + for kv in ${parts[@]+"${parts[@]}"}; do + key=$(printf '%s' "${kv%%=*}" | tr '[:upper:]' '[:lower:]') + if [ "${key}" = "${drop}" ]; then + echo "WARN: ignoring REFCHAINS_ARGS entry '${kv}' while sweeping ${drop}" >&2 + continue + fi + out="${out:+${out}:}${kv}" + done + printf '%s' "${out}" +} + echo "param_value,entries_per_sec,avg_round_ms,max_round_ms,heap_growth_mb,stw_count,stw_total_s,stw_avg_s,stw_max_s,peak_rss_kb,wall_seconds" > "${CSV}" # Parses one run's logs into a single space-separated metrics line - same @@ -114,7 +142,8 @@ for value in "${SWEEP_VALUES[@]}"; do echo echo "=== running ${SWEEP_PARAM}=${value} ===" - REFCHAINS_ENABLED="true" REFCHAINS_ARGS="${SWEEP_PARAM}=${value}${REFCHAINS_ARGS:+:${REFCHAINS_ARGS}}" \ + fixed_args="$(fixed_args_without "${SWEEP_PARAM}")" + REFCHAINS_ENABLED="true" REFCHAINS_ARGS="${SWEEP_PARAM}=${value}${fixed_args:+:${fixed_args}}" \ "${HERE}/run-refchains-repro.sh" "${jfr}" "${DURATION_SECONDS}" \ > "${WORKDIR}/${label}.stdout.log" 2>&1 & pid=$! From 860860ff5ccec538b19deb27e0ef43ec7d2862dd Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Tue, 20 Oct 2026 15:33:44 +0200 Subject: [PATCH 13/17] Reduce build-and-summarize to log capture and failure extraction The wrapper had grown a live-tail/awk pipeline, a 150-line embedded log parser, and summary artifacts - machinery from an era when builds were summarized by a billed subagent call. Harnesses truncate agent output and keep the full log on disk anyway, so the agent only needs the status line plus the failure section, extracted by grep. Update AGENTS.md's operating guide to match (no gradle-log-analyst delegation, no summary artifacts). --- .claude/commands/build-and-summarize | 291 +++------------------------ AGENTS.md | 18 +- 2 files changed, 35 insertions(+), 274 deletions(-) diff --git a/.claude/commands/build-and-summarize b/.claude/commands/build-and-summarize index 5e14c1c9e7..a10bd3d468 100755 --- a/.claude/commands/build-and-summarize +++ b/.claude/commands/build-and-summarize @@ -1,275 +1,44 @@ #!/usr/bin/env bash -set -euo pipefail +# Runs Gradle with the full output captured to a timestamped log so an agent +# session never ingests a multi-thousand-line build log. Prints the status +# line; on failure, extracts the "What went wrong" blocks and failing-test +# lines. The log file remains the source of truth for anything rarer. +# +# Usage: build-and-summarize [gradle-task...] (default: build) +# +# No live tail and no summary artifacts: a harness tool result arrives +# atomically after the run anyway, so streaming filters only added a +# background process to manage, and the failures section below is everything +# an agent needs before deciding to grep the full log. +set -u -mkdir -p build/logs build/reports/claude .claude/out -STAMP="$(date +%Y%m%d-%H%M%S)" - -# Args (default to 'build') ARGS=("$@") -if [ "${#ARGS[@]}" -eq 0 ]; then - ARGS=(build) -fi +[ "${#ARGS[@]}" -eq 0 ] && ARGS=(build) -# Label for the log file from the first arg +STAMP="$(date +%Y%m%d-%H%M%S)" LABEL="$(printf '%s' "${ARGS[0]}" | tr '/:' '__')" LOG="build/logs/${STAMP}-${LABEL}.log" +mkdir -p "$(dirname "$LOG")" -# Ensure we clean the tail on exit -tail_pid="" -cleanup() { [ -n "${tail_pid:-}" ] && kill "$tail_pid" 2>/dev/null || true; } -trap cleanup EXIT INT TERM - -echo "▶ Logging full Gradle output to: $LOG" -echo "▶ Running: ./gradlew ${ARGS[*]} -i --console=plain" -echo " (Console output here is minimized; the full log is in the file.)" -echo - -# Start Gradle fully redirected to the log (no stdout/stderr to this session) -# Use stdbuf to make the output line-buffered in the log for timely tailing. -( stdbuf -oL -eL ./gradlew "${ARGS[@]}" -i --console=plain ) >"$LOG" 2>&1 & -gradle_pid=$! - -# Minimal live progress: follow the log and print only interesting lines -# - Task starts -# - Final build status -# - Test summary lines -# tail itself is the background job, so $! is its PID and killing it also ends -# awk. (Backgrounding "tail | awk" would make $! the PID of awk instead: killing -# awk leaves tail following a log that never grows again, so it never notices, -# and since it inherits this script's stderr, a caller piping our output never -# sees end of input.) -tail -n0 -F "$LOG" 2>/dev/null > >(awk ' - /^> Task / { print; fflush(); next } - /^BUILD (SUCCESSFUL|FAILED)/ { print; fflush(); next } - /[0-9]+ tests? (successful|failed|skipped)/ { print; fflush(); next } -') & -tail_pid=$! +# One log per build, hundreds of KB each, and agent sessions generate many: +# prune to the newest 20 so the directory stays bounded. +ls -t build/logs/*.log 2>/dev/null | tail -n +21 | xargs rm -f 2>/dev/null || true -# Wait for Gradle to finish. set -e would abort right here on a failed build (before any summary -# runs), so capture the status instead of letting errexit see it. -status=0 -wait "$gradle_pid" || status=$? +echo "▶ ./gradlew ${ARGS[*]} -i --console=plain (full log: $LOG)" +./gradlew "${ARGS[@]}" -i --console=plain >"$LOG" 2>&1 +status=$? -# Stop the tail and print a compact summary from the log -kill "$tail_pid" 2>/dev/null || true -tail_pid="" - -echo -echo "=== Summary ===" -# Grab the last BUILD line and nearest test summary lines -awk ' - /^BUILD (SUCCESSFUL|FAILED)/ { lastbuild=$0 } - /[0-9]+ tests? (successful|failed|skipped)/ { tests=$0 } - END { - if (lastbuild) print lastbuild; - if (tests) print tests; - } -' "$LOG" || true - -echo -if [ $status -eq 0 ]; then +if [ "$status" -eq 0 ]; then echo "✔ Gradle completed. Full log at: $LOG" else echo "✖ Gradle failed with status $status. Full log at: $LOG" -fi - -# Generate the summary artifacts deterministically — no LLM, no claude spawn. -# (The old tail spawned a headless `claude` per build; managed settings pin that -# to sonnet-5 via the AI gateway, billing real money for every log parse.) -echo -echo "Generating gradle summary…" -# Single writer for the UNKNOWN artifact pair: every path that cannot produce a real summary -# (unusable log, generator exception, missing python3) goes through here, so the schema lives once. -# Keys/order match the generator's success-path JSON below. -write_unknown_summary() { - local out=build/reports/claude detail detail_json - detail="$1, see $LOG" - detail_json="$(printf '%s' "$detail" | sed -e 's/\\/\\\\/g' -e 's/"/\\"/g')" - mkdir -p "$out" - printf '# Gradle Summary\n\n- Status: UNKNOWN (%s)\n- Log: %s\n' "$1" "$LOG" > "$out/gradle-summary.md" - printf '{"status": "UNKNOWN", "totalTime": null, "failedTasks": [], "primaryFailures": [], "warnings": [], "tests": {"total": 0, "failed": 0, "skipped": 0, "modules": {}}, "slowTasks": [], "depIssues": ["%s"], "actions": []}\n' "$detail_json" > "$out/gradle-summary.json" -} - -# A generator failure (exception, missing python3) must not leave stale or missing artifacts -# behind: capture its rc and write an UNKNOWN pair below. Gradle's own status stays authoritative -# for the exit code. -summary_rc=0 -if [ ! -s "$LOG" ]; then - if [ -f "$LOG" ]; then why="log is empty"; else why="log not found"; fi - write_unknown_summary "$why" - echo "Gradle log unusable ($why); wrote build/reports/claude/gradle-summary.{md,json}" -else -python3 - "$LOG" <<'PYEOF' || summary_rc=$? -import json, os, re, sys - -log_path = sys.argv[1] if len(sys.argv) > 1 else "" -OUT_DIR = os.path.join("build", "reports", "claude") -MD = os.path.join(OUT_DIR, "gradle-summary.md") -JS = os.path.join(OUT_DIR, "gradle-summary.json") - -status, total_time, cur_task = "UNKNOWN", None, None -failed_tasks, headlines, dep_issues, test_failures = [], [], [], [] -warnings, seen_warnings = [], set() -tests = {"total": 0, "failed": 0, "skipped": 0, "modules": {}} - -RE_STATUS = re.compile(r"^BUILD (SUCCESSFUL|FAILED)(?: in (.+?))?\s*$") -RE_TASK = re.compile(r"^> Task (\S+)") -# A summary line may carry several counts ("N tests successful, M failed, K skipped"): RE_GSUM -# matches the whole run of counts, RE_GSUM_PART splits it so none of them is dropped. -RE_GSUM = re.compile(r"\d+ tests? (?:successful|failed|skipped)" - r"(?:,\s*\d+ (?:tests? )?(?:successful|failed|skipped))*") -RE_GSUM_PART = re.compile(r"(\d+) (?:tests? )?(successful|failed|skipped)") -RE_HL_TASK = re.compile(r"task '([^']+)'") -RE_COMP = re.compile(r"(\d+) tests? completed(?:, (\d+) failed)?(?:, (\d+) skipped)?") -RE_GTEST_P = re.compile(r"\[ PASSED \] (\d+) tests?") -RE_GTEST_F = re.compile(r"\[ FAILED \] (\d+) tests?") -RE_DEP = re.compile(r"Could not (?:resolve|find|get)|timed out|status code: 40[13]|artifact .* not found", re.I) -RE_WARN = re.compile(r"\bw: |warning:|deprecat", re.I) - -def mod(name): - return tests["modules"].setdefault(name, {"total": 0, "failed": 0, "skipped": 0}) - -def add_counts(name, ok, failed, skipped): - m = mod(name) - m["total"] += ok + failed + skipped - m["failed"] += failed - m["skipped"] += skipped - tests["total"] += ok + failed + skipped - tests["failed"] += failed - tests["skipped"] += skipped - -grab_headline = False -with open(log_path, encoding="utf-8", errors="replace") as f: - for line in f: - line = line.rstrip("\n") - m = RE_STATUS.match(line) - if m: - status = m.group(1) - total_time = m.group(2) - continue - m = RE_TASK.match(line) - if m: - cur_task = m.group(1) - if line.endswith("FAILED") and m.group(1) not in failed_tasks: - failed_tasks.append(m.group(1)) - continue - # Gradle prints one "* What went wrong" block per failure ("FAILURE: Build failed with - # an exception." for one, "FAILURE: Build completed with N failures." + numbered blocks - # for several), so capture a headline at every such block, not just after the banner. - if line.startswith("FAILURE: Build "): - continue - if line.strip().startswith("* What went wrong"): - headlines.append("") - grab_headline = True - continue - if grab_headline: - s = line.strip() - if s.startswith("*") or not s: - if headlines and headlines[-1]: - grab_headline = False - continue - if len(headlines[-1]) < 200: - headlines[-1] += (" " if headlines[-1] else "") + s - continue - m = RE_COMP.search(line) - if m: - total = int(m.group(1)) - failed = int(m.group(2) or 0) - skipped = int(m.group(3) or 0) - add_counts(cur_task or "(unknown)", total - failed - skipped, failed, skipped) - continue - m = RE_GSUM.search(line) - if m: - counts = {"successful": 0, "failed": 0, "skipped": 0} - for pm in RE_GSUM_PART.finditer(m.group(0)): - counts[pm.group(2)] += int(pm.group(1)) - add_counts(cur_task or "(unknown)", counts["successful"], counts["failed"], counts["skipped"]) - continue - m = RE_GTEST_P.search(line) - if m: - add_counts(cur_task or "(gtest)", int(m.group(1)), 0, 0) - continue - m = RE_GTEST_F.search(line) - if m: - add_counts(cur_task or "(gtest)", 0, int(m.group(1)), 0) - continue - if re.search(r" > \S+(?:\.\S+)+.* FAILED$", line) or re.search(r"\[ FAILED \] (\S+)", line): - test_failures.append(line.strip()) - continue - if RE_DEP.search(line) and len(dep_issues) < 20: - if line not in dep_issues: - dep_issues.append(line.strip()) - continue - wm = RE_WARN.search(line) - if wm and len(warnings) < 40: - key = line.strip()[:160] - if key not in seen_warnings: - seen_warnings.add(key) - warnings.append(key) - -# Pair each failed task with the headline that names it ("Execution failed for task ':x:y'."); -# a task with no naming headline points at the build-level Primary Failure section instead of -# being paired positionally with an unrelated headline. -primary_failures = [h for h in headlines if h] -headline_by_task = {} -for h in primary_failures: - hm = RE_HL_TASK.search(h) - if hm and hm.group(1) not in headline_by_task: - headline_by_task[hm.group(1)] = h -fallback = "(see Primary Failure)" if primary_failures else "" -failed = [] -for t in failed_tasks: - h = headline_by_task.get(t) or fallback - failed.append(t + (" — " + h if h else "")) -data = {"status": status, "totalTime": total_time, "failedTasks": failed, - "primaryFailures": primary_failures, "warnings": warnings, - "tests": tests, "slowTasks": [], "depIssues": dep_issues, "actions": []} - -os.makedirs(OUT_DIR, exist_ok=True) -with open(JS, "w") as f: - json.dump(data, f, indent=1) - -L = ["# Gradle Summary\n", f"- Status: {status}", f"- Total time: {total_time or 'UNKNOWN'}", - f"- Log: {log_path}\n"] -if failed: - L.append("## Failing Tasks") - L += [f"- {t}" for t in failed] - L.append("") -if primary_failures: - L.append("## Primary Failure") - L += [f"```text\n{h}\n```" for h in primary_failures[:3]] - if len(primary_failures) > 3: - L.append(f"… {len(primary_failures) - 3} more (see primaryFailures in {JS})") - L.append("") -if tests["total"]: - L.append("## Tests") - L.append(f"- Total: {tests['total']}, failed: {tests['failed']}, skipped: {tests['skipped']}") - for name, m in tests["modules"].items(): - L.append(f" - {name}: {m['total']} total, {m['failed']} failed, {m['skipped']} skipped") - if test_failures: - L.append("- Top failing tests:") - L += [f" - {t}" for t in test_failures[:10]] - L.append("") -if warnings: - L.append("## Warnings") - L += [f"- {w}" for w in warnings[:20]] - L.append("") -if dep_issues: - L.append("## Dependency / Network Issues") - L += [f"- {d}" for d in dep_issues[:10]] - L.append("") -L.append("- Per-task durations are not present in plain `-i` console logs; slowTasks omitted.") -open(MD, "w").write("\n".join(L) + "\n") - -print(f"{status} (time: {total_time or 'n/a'}); {len(failed)} failing task(s), {tests['failed']} test failure(s)") -print(f"Wrote {MD} and {JS}") -PYEOF -fi - -if [ "$summary_rc" -ne 0 ]; then - echo "⚠ gradle summary generation failed (rc=$summary_rc) — full log at: $LOG" - write_unknown_summary "summary generation failed, rc=$summary_rc" - # Gradle's own status is authoritative; the generator rc surfaces only when the build passed. - exit $(( status != 0 ? status : summary_rc )) + echo + echo "=== What went wrong ===" + sed -n '/^\* What went wrong:/,/^\* Try:/p' "$LOG" | head -40 + echo + echo "=== Failing tasks/tests ===" + grep -E '^> Task .+FAILED$' "$LOG" | head -10 + grep -E '[0-9]+ tests completed(, [0-9]+ failed)?' "$LOG" | head -5 + grep -E '[a-zA-Z0-9_.$]+ > [A-Za-z0-9_.$()]+ FAILED$' "$LOG" | head -20 fi exit "$status" diff --git a/AGENTS.md b/AGENTS.md index 3efe487869..d5de249d0b 100644 --- a/AGENTS.md +++ b/AGENTS.md @@ -43,12 +43,11 @@ You are the **Main Orchestrator** for this repository. ### Goals - When I ask you to build, you MUST: - 1) run the Gradle task with plain console and increased verbosity, - 2) capture stdout into `build/logs/-.log`, - 3) **delegate** parsing to the sub-agent `gradle-log-analyst`, - 4) respond in chat with only a short status and the two output file paths: - - `build/reports/claude/gradle-summary.md` - - `build/reports/claude/gradle-summary.json` + 1) invoke the wrapper `./.claude/commands/build-and-summarize ` — + it runs Gradle with `--console=plain -i`, captures the full output into + `build/logs/-.log`, and prints only the status line; + 2) on failure, read the wrapper's extracted "What went wrong" section and the + failing task/test lines; grep the log file for anything rarer. ### Rules - **Never** paste large log chunks into the chat. @@ -57,13 +56,6 @@ You are the **Main Orchestrator** for this repository. - Assume macOS/Linux unless I explicitly say Windows; if Windows, use PowerShell equivalents. - If a step fails, print the failing command and a one-line hint, then stop. -### Implementation Hints -- For builds, always use: `--console=plain -i` (or `-d` if I ask for debug). -- Use `mkdir -p build/logs build/reports/claude` before writing. -- Timestamp format: `$(date +%Y%m%d-%H%M%S)`. -- After the build finishes, call the sub-agent like: - "Use `gradle-log-analyst` to parse LOG_PATH; write the two reports; reply with only a 3–6 line status and the two relative file paths." - ### Shortcuts I Expect - `./gradlew ` to do everything in one step. - If I just say "build assembleDebugJar", interpret that as the shortcut above. From 123cefb93b8b531251019aaa56be9892fcf214e1 Mon Sep 17 00:00:00 2001 From: Jaroslav Bachorik Date: Tue, 20 Oct 2026 17:55:46 +0200 Subject: [PATCH 14/17] sphinx: address review feedback on PR #801 --- .../LeakTagCorrelationScenario.java | 3 +- ...se-of-default-tostring-default-tostring.md | 173 ++++++++++ utils/compare-refchains-repro.sh | 33 +- utils/refchains-jfr-metrics.py | 183 ++++++++--- utils/refchains-report-multi.py | 1 + utils/refchains-report.py | 1 + utils/run-chaos-harness.sh | 1 + utils/run-refchains-repro.sh | 1 + utils/sweep-refchains-all.sh | 44 +-- utils/sweep-refchains-budgets.sh | 1 + utils/tests/test_compare_refchains_repro.sh | 144 ++++++++ utils/tests/test_refchains_jfr_metrics.sh | 309 ++++++++++++++++++ utils/tests/test_sweep_refchains_parse_run.sh | 206 ++++++++++++ 13 files changed, 1040 insertions(+), 60 deletions(-) create mode 100644 docs/sphinx/specs/2026-10-20-use-of-default-tostring-default-tostring.md create mode 100755 utils/tests/test_compare_refchains_repro.sh create mode 100755 utils/tests/test_refchains_jfr_metrics.sh create mode 100755 utils/tests/test_sweep_refchains_parse_run.sh diff --git a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java index 83cd91efd9..09aa6a56cf 100644 --- a/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java +++ b/ddprof-test/src/test/java/com/datadoghq/profiler/referencechains/LeakTagCorrelationScenario.java @@ -261,7 +261,8 @@ public static void run(JavaProfiler profiler, String startCommand, Path scratchD noiseTid = handoff.tid; if (noiseRepresentative == null || noiseTid == 0) { throw new IllegalStateException("noise thread never published its representative/tid" - + " within 5s (representative=" + noiseRepresentative + ", tid=" + noiseTid + ")"); + + " within 5s (representative=" + (noiseRepresentative == null ? "null" : "present") + + ", tid=" + noiseTid + ")"); } ReferenceChainTestHooks.setKlassPopulationRepresentativeForTest0( NOISE_KLASS_ID, noiseRepresentative); diff --git a/docs/sphinx/specs/2026-10-20-use-of-default-tostring-default-tostring.md b/docs/sphinx/specs/2026-10-20-use-of-default-tostring-default-tostring.md new file mode 100644 index 0000000000..cde391018b --- /dev/null +++ b/docs/sphinx/specs/2026-10-20-use-of-default-tostring-default-tostring.md @@ -0,0 +1,173 @@ +# Spec: use-of-default-tostring-default-tostring + +PR 801 review fixes (run `2026-10-20T17:45:00Z-addr-learn-pr801-retry3`). Five +change requests in the reference-chains test code and the `utils/refchains-*` +tooling. Ground truth for the design: `.sphinx/address/design.md`. + +## Problem + +1. **4268414107.** The noise-handoff failure message in + `LeakTagCorrelationScenario.java` concatenates `noiseRepresentative`. Its type + is `NoisePayload`, which has no `toString()` override, so the message prints + `ClassName@hash`. Only whether the object is present matters for diagnosis. +2. **4326370498.** `utils/refchains-jfr-metrics.py` runs the bare `jfr` from + PATH, even when `REFCHAINS_JAVA_HOME` selects the JDK the repro ran on. A + missing or older `jfr` fails. The sweep then discards stderr and records a + silent `0 0 -1`. +3. **4326370538.** Each `dump()` switches the chunk, so each snapshot file is + one chunk whose `jfr summary` Start is the previous dump. Cached chains are + re-stamped into every dump. The sweep runs the parser once per file and takes + the min of the per-file "chain − chunk start" values. That converges to about + one dump interval, not the time since run start. Also, the bash `-ge`/`-lt` + comparisons on `%.3f` floats never succeed, so `time_to_first_chain_s` + always stays `-1`. +4. **4326370566.** `utils/compare-refchains-repro.sh` swallows each variant's + exit status. Missing metrics are then parsed as zeros, and the script emits + definitive conclusions from a failed experiment. +5. **4326370585.** The new refchains scripts lack the Datadog copyright header + that AGENTS.md requires. + +## Correct behaviour + +### A. Test diagnostics +- The message prints `representative=null` or `representative=present`, using + `(noiseRepresentative == null ? "null" : "present")`. The ternary must be in + parentheses. +- The throw condition, the following + `setKlassPopulationRepresentativeForTest0` call, and the nulling of the local + do not change. +- `NoisePayload` gets no `toString()`. + +### B. JFR metrics pipeline +- **I-B1 (origin).** Time-to-first-chain (ttf) is measured from the ORIGINAL + recording start. The per-file origin is chosen in this order: + 1. `jdk.ActiveRecording.recordingStart` + 2. else that event's `startTime` + 3. else the `jfr summary` Start +- **I-B2 (aggregation).** `refchains-jfr-metrics.py` accepts 1..N snapshot + paths and prints ONE aggregate: + - `chain_count` = sum of `datadog.ReferenceChain` events over all read files. + - `abandoned_count` = sum of `datadog.ReferenceChainAbandoned` events. + - `ttf = max(0, min(all chain startTimes) − min(all origins))`. + - The sweep invokes it exactly once per run, with every snapshot file of that + run. +- **I-B3 (sentinel).** No chain, or no origin, gives ttf printed as `-1.000`. +- **I-B4 (jfr selection).** + - `REFCHAINS_JAVA_HOME` set and non-empty: use `$REFCHAINS_JAVA_HOME/bin/jfr` + if it is an executable regular file. Otherwise print to stderr + `error: not found/executable - check REFCHAINS_JAVA_HOME` and exit 1 + immediately. Never fall back to PATH. + - Unset or empty: use `jfr` from PATH. + - Resolution happens once, before any file is read. +- **I-B5 (failure visibility).** + - If a `jfr` invocation fails (non-zero exit or `OSError`) or its output is not + valid JSON, that file is skipped with a stderr warning. + - If no file was read, exit non-zero. + - The sweep no longer discards the parser's stderr. When the parser fails, + the sweep prints + `WARN: refchains-jfr-metrics failed for '