RFR: 8346727: JvmtiVTMSTransitionDisabler deadlock

Serguei Spitsyn sspitsyn at openjdk.org
Thu Jan 9 05:07:47 UTC 2025


This is a fix of one more deadlock issue related to `interruptLock` critical sections. When the `interruptLock` is hold by the target virtual thread it is unsafe to suspend or post JVMTI events. This update is to ignore the JVMTI events when the `interruptLock` is hold. It is additionally to the cases when the target JavaThread is in a `VTMS` transition. It is based on the existing mechanism disallowing JVMTI suspends while the `interruptLock` is hold. In order to support this the target JavaThread has the `_is_disable_suspend` bit.

Testing:
- Ran mach5 tiers 1-6
- There is no regression test for this issue as it is not hard to construct one. Originally, the issue was reported by JGroups which is using the `Async` profiler.

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Commit messages:
 - 8346727: JvmtiVTMSTransitionDisabler deadlock

Changes: https://git.openjdk.org/jdk/pull/22997/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22997&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346727
  Stats: 53 lines in 2 files changed: 2 ins; 0 del; 51 mod
  Patch: https://git.openjdk.org/jdk/pull/22997.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22997/head:pull/22997

PR: https://git.openjdk.org/jdk/pull/22997


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