8264605: vmTestbase/nsk/jvmti/SuspendThread/suspendthrd003/TestDescription.java failed with "agent_tools.cpp, 471: (foundThread = (jthread) jni_env->NewGlobalRef(foundThread)) != NULL"

[lmesnik]

The agentThread variable might have been set by the new agentThread iteration and then deleted in the wrapper from the previous iteration.

The deletion of agentThread variable should be synced with the termination of the agent thread.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8264605: vmTestbase/nsk/jvmti/SuspendThread/suspendthrd003/TestDescription.java failed with "agent_tools.cpp, 471: (foundThread = (jthread) jni_env->NewGlobalRef(foundThread)) != NULL"

Reviewers

• Serguei Spitsyn (@sspitsyn - Reviewer)
• David Holmes (@dholmes-ora - Reviewer)

Reviewing

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Checkout this PR locally:
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Update a local copy of the PR:
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[bridgekeeper]

👋 Welcome back lmesnik! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@lmesnik this pull request can not be integrated into master due to one or more merge conflicts. To resolve these merge conflicts and update this pull request you can run the following commands in the local repository for your personal fork:

git checkout 8264605
git fetch https://git.openjdk.java.net/jdk master
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git commit -m "Merge master"
git push

[openjdk]

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[mlbridge]

Webrevs

• 00: Full (46fdc309)

[dholmes-ora]

Hi Leonid,

I don't think this is sufficient. You have moved the cleanup of the agentThread under the protection of the rawMonitor for termination, but unless the initialization of agentThread is also protected by the rawMonitor then you still have a problem AFAICS.

Cheers,
David

[lmesnik]

The new thread is started in nsk_jvmti_runAgentThread which is executed under monitors also as well as nsk_jvmti_resetAgentData.
Could you please point exact location which is not protected? Seems all thread_state changes and agentThread changes are protected.

[sspitsyn]

Hi Leonid,
It looks good to me.
I see the initialization of agentThread is also protected with the data.monitor. This code is a little bit ugly, so it is not clear that startAgentThreadWrapper is executed under rawMonitor protection.
Thanks,
Serguei

[openjdk]

@lmesnik This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8264605: vmTestbase/nsk/jvmti/SuspendThread/suspendthrd003/TestDescription.java failed with "agent_tools.cpp, 471: (foundThread = (jthread) jni_env->NewGlobalRef(foundThread)) != NULL"

Reviewed-by: sspitsyn, dholmes

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 19 new commits pushed to the master branch:

• 7b2d823: 8277503: compiler/onSpinWait/TestOnSpinWaitAArch64DefaultFlags.java failed with "OnSpinWaitInst with the expected value 'isb' not found."
• 7cb56a2: 8265796: vmTestbase/nsk/jdi/ObjectReference/referringObjects/referringObjects002/referringObjects002.java fails when running with JEP 416
• 24e586a: 8276764: Enable deterministic file content ordering for Jar and Jmod
• ea85e01: 8271623: Omit enclosing instance fields from inner classes that don't use it
• 0320672: 8277451: java.lang.reflect.Field::set on static field with invalid argument type should throw IAE
• e8acac2: 8277350: runtime/jni/checked/TestPrimitiveArrayCriticalWithBadParam.java times out
• 8a44e09: 8268725: jshell does not support the --enable-native-access option
• 7b67a49: 8261847: performance of java.lang.Record::toString should be improved
• 38802ad: 8254108: ciReplay: Support incremental inlining
• 64bdc84: 8277649: [BACKOUT] JDK-8277507 Add jlink.debug system property while launching jpackage tests to help diagonize recent intermittent failures
• ... and 9 more: https://git.openjdk.java.net/jdk/compare/bb11c55dff86706a010c93ee2cc60c87bb2d53b6...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[dholmes-ora]

Sorry @lmesnik I missed the higher-level use of the monitor when starting the thread.

[lmesnik]

/integrate

[lmesnik]

@dholmes-ora, @sspitsyn - Thank you for the review!

[openjdk]

Going to push as commit 96fe1d0.
Since your change was applied there have been 30 commits pushed to the master branch:

• 077b2de: 8274161: Cleanup redundant casts in jdk.compiler
• 951247c: 8235876: Misleading warning message in java source-file mode
• 663e33d: 8272728: javac ignores any -J option in @argfiles silently
• 0384739: 8276665: ObjectInputStream.GetField.get(name, object) should throw ClassNotFoundException
• cf7adae: 8275320: NMT should perform buffer overrun checks
• 96e3607: 8275063: Implementation of Foreign Function & Memory API (Second incubator)
• 17e68ca: 8277042: add test for 8276036 to compiler/codecache
• 8a8bc29: 8277562: Remove dead method c1 If::swap_sux
• d085c2b: 8273328: Compiler implementation for Pattern Matching for switch (Second Preview)
• 6d73460: 8277399: ZGC: Move worker thread logging out of gc+phase=debug
• ... and 20 more: https://git.openjdk.java.net/jdk/compare/bb11c55dff86706a010c93ee2cc60c87bb2d53b6...master

Your commit was automatically rebased without conflicts.

[openjdk]

@lmesnik Pushed as commit 96fe1d0.

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