[jdk19] RFR: 8289709: fatal error: stuck in JvmtiVTMSTransitionDisabler::disable_VTMS_transitions
Serguei Spitsyn
sspitsyn at openjdk.org
Sat Jul 9 06:49:21 UTC 2022
This is a test bug. The test should filter out non-tested threads to avoid generating such kind of deadlocks.
In short, the deadlock dependencies are:
- The `Common-Cleaner` thread is executing the JVM TI agent `MethodEntry` event callback which grabbed the `agent_lock` raw monitor and calls JVM TI `GetFrameCount`. The `GetFrameCount` is blocked in disabling VTMS transitions because the `ForkJoinPool-1-worker-2` is at a mount (VTMS) transition.
- The `ForkJoinPool-1-worker-2` is at mount (VTMS) transition and blocked in `java.lang.ref.NativeReferenceQueue.poll()` when acquiring the `NativeReferenceQueue` lock which is held by the `Reference Handler` thread.
- The `Reference Handler` thread grabbed the `NativeReferenceQueue` lock and is entering the `signal()` method. It triggered a JVM TI `MethodEntry` event. The JVM TI agent `MethodEntry` event callback is blocked on grabbing the `agent_lock` raw monitor which is held by the `Common-Cleaner` thread.
Also, the `timeout=360 `is explicitly set to avoid frequent timeouts in locals runs.
Testing: submitted mach5 job with 100 runs on 3 debug platforms.
-------------
Commit messages:
- 8289709: fatal error: stuck in JvmtiVTMSTransitionDisabler::disable_VTMS_transitions
Changes: https://git.openjdk.org/jdk19/pull/129/files
Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=129&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8289709
Stats: 35 lines in 2 files changed: 10 ins; 6 del; 19 mod
Patch: https://git.openjdk.org/jdk19/pull/129.diff
Fetch: git fetch https://git.openjdk.org/jdk19 pull/129/head:pull/129
PR: https://git.openjdk.org/jdk19/pull/129
More information about the serviceability-dev
mailing list