8322846: Running with -Djdk.tracePinnedThreads set can hang

[shipilev]

Fixes the hang with the diagnostic option.

Additional testing:

• New test fails without the fix, passes with it
• Linux AArch64 server fastdebug, all

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8322846 needs maintainer approval

Issue

• JDK-8322846: Running with -Djdk.tracePinnedThreads set can hang (Bug - P3 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/270/head:pull/270
$ git checkout pull/270

Update a local copy of the PR:
$ git checkout pull/270
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/270/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 270

View PR using the GUI difftool:
$ git pr show -t 270

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/270.diff

Webrev

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[bridgekeeper]

👋 Welcome back shade! 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]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

⚠️ @shipilev This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (adc60008)

[shipilev]

GHA failure during RISC-V build is infrastructural: JDK-8326960.

[shipilev]

/approval request Fixes the hang when using a routine diagnostic option. Applies cleanly. New test reliably fails without the fix. All other tests are passing. Risk is medium-low, as it affects the diagnostic path that is not enabled by default.

[openjdk]

@shipilev
8322846: The approval request has been created successfully.

[openjdk]

@shipilev 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:

8322846: Running with -Djdk.tracePinnedThreads set can hang

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 1 new commit pushed to the master branch:

• 2d791b8: 8323170: j2dbench is using outdated javac source/target to be able to build by itself

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
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.

[shipilev]

/integrate

[openjdk]

Going to push as commit 76ebcc1.
Since your change was applied there has been 1 commit pushed to the master branch:

• 2d791b8: 8323170: j2dbench is using outdated javac source/target to be able to build by itself

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit 76ebcc1.

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