RFR: 8346727: JvmtiVTMSTransitionDisabler deadlock [v3]
Serguei Spitsyn
sspitsyn at openjdk.org
Fri Jan 10 02:27:16 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: tweak some assert messages
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/22997/files
- new: https://git.openjdk.org/jdk/pull/22997/files/8cc92a90..46527318
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=22997&range=02
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=22997&range=01-02
Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 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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