debugger: preserve overlapping CDP request state

lib/internal/debugger/inspect_probe.js

@@ -707,7 +707,8 @@ class ProbeInspectorSession {
 
   async callCdp(method, params, probe = null) {
     if (this.finished) { throw kInspectorFailedSentinel; }
-    this.inFlight = { __proto__: null, method, probe };
+    const request = { __proto__: null, method, probe };
+    this.inFlight = request;
     debug('CDP -> %s%s', method, probe !== null ? `, probe=${probe.index}` : '');
     try {
       const result = await this.client.callMethod(method, params);
@@ -763,7 +764,9 @@ class ProbeInspectorSession {
       }
       throw kInspectorFailedSentinel;
     } finally {
-      this.inFlight = null;
+      if (this.inFlight === request) {
+        this.inFlight = null;
+      }
     }
   }
 

test/parallel/test-debugger-probe-failure-process-exit.js

@@ -1,5 +1,6 @@
-// This tests that a clean process.exit(0) from inside a probe expression
-// surfaces as probe_failure, not probe_target_exit.
+// This tests end-to-end that a clean process.exit(0) from inside a probe
+// expression remains attributed to that probe and surfaces as probe_failure,
+// not probe_target_exit.
 'use strict';
 
 const common = require('../common');