RFR: 8346727: JvmtiVTMSTransitionDisabler deadlock [v4]

Serguei Spitsyn sspitsyn at openjdk.org
Sat Jan 11 06:01:33 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.

Serguei Spitsyn has updated the pull request incrementally with one additional commit since the last revision:

  review: fixed a typo in new comment

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22997/files
  - new: https://git.openjdk.org/jdk/pull/22997/files/46527318..a85b5985

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22997&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22997&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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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