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Temporary, and not to be merged. Every candidate commit is a job under both Swift minors, and each job runs the asynchronous locks' measurements over and over for as long as its budget lasts, counting the runs that fail.
Every candidate crashed as often as develop for the time it ran, the one before the push included, and four of the crashes were inside measurements that run an actor and none of the package's locks. Give each kind of measurement a process to itself: the actors, the locks, and the semaphore suite that has not crashed yet.
The measurements that run an actor and none of the package's locks crashed fourteen times in 1249 runs, in a process of their own. Reproducer is what they do as a program that depends on nothing, run the same way, and on x86_64 beside arm64 to say whether the architecture is part of it.
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Done with: no commit brought the crash, none of the package's code is needed for it, and it is arm64's alone. The three rounds, their numbers and the reproducer are written up in #11. |
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Not to be merged. This exists to run
.github/workflows/bisect.ymlon the runner the crash happens on.What is being looked for
On the
Ubuntu 24.04 · Swift 6.x (arm64)rows, a libdispatch worker dies during the asynchronous locks' measurements:0xffffffff89abcdefisDISPATCH_OBJECT_LISTLESS: the root queue's head is an item whosedo_nextwas marked as being on no list. Seen since the push that ended at 6eb547f, about one run in two, under both Swift minors, inAsyncMutexPerformanceTestsandAsyncRWLockPerformanceTestsand never inAsyncSemaphorePerformanceTests; never on x86_64, macOS, or a sanitized row. It does not reproduce locally.How
Six candidates × two Swift minors, one job each, all on
ubuntu-24.04-arm. Each builds the release test binary with the flagsswift.ymluses and runs the two suites repeatedly for 35 minutes, or until four runs have failed. The count goes to the run's summary.@exclusivity(unchecked),unowned(unsafe)