8360312: Serviceability Agent tests fail with JFR enabled due to unknown thread type JfrRecorderThread

[plummercj]

Clean backport of JDK-8360312. The bug was introduced in JDK25 and fixed in JDK26, so should be backported to JDK25.

Tier5 ci testing in progress.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8360312: Serviceability Agent tests fail with JFR enabled due to unknown thread type JfrRecorderThread (Bug - P3)

Reviewers

• Kevin Walls (@kevinjwalls - Reviewer)
• Serguei Spitsyn (@sspitsyn - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/26198/head:pull/26198
$ git checkout pull/26198

Update a local copy of the PR:
$ git checkout pull/26198
$ git pull https://git.openjdk.org/jdk.git pull/26198/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 26198

View PR using the GUI difftool:
$ git pr show -t 26198

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/26198.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back cjplummer! A progress list of the required criteria for merging this PR into jdk25 will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@plummercj 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:

8360312: Serviceability Agent tests fail with JFR enabled due to unknown thread type JfrRecorderThread

Reviewed-by: kevinw, sspitsyn

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 5 new commits pushed to the jdk25 branch:

• 1de8943: 8361175: JFR: Document differences between method sample events
• 50751da: 8361570: Incorrect 'sealed is not allowed here' compile-time error
• 21cb2ac: 8361445: javac crashes on unresolvable constant in @SuppressWarnings
• ... and 2 more: https://git.openjdk.org/jdk/compare/b8965318c1b1ddafac7df6c0d6c807586876ebcf...jdk25

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 jdk25 branch, type /integrate in a new comment.

[openjdk]

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

[openjdk]

@plummercj The following labels will be automatically applied to this pull request:

• hotspot
• serviceability

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing lists. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 00: Full (eebca75f)

[sspitsyn]

It is a clean backport.

[plummercj]

Thank you for the reviews Kevin and Serguei!

/integrate

[openjdk]

Going to push as commit 9638050.
Since your change was applied there have been 7 commits pushed to the jdk25 branch:

• 9b99ed8: 8361299: (bf) CharBuffer.getChars(int,int,char[],int) violates pre-existing specification
• 532b1c7: 8360599: [TESTBUG] DumpThreadsWithEliminatedLock.java fails because of unstable inlining
• 1de8943: 8361175: JFR: Document differences between method sample events
• ... and 4 more: https://git.openjdk.org/jdk/compare/b8965318c1b1ddafac7df6c0d6c807586876ebcf...jdk25

Your commit was automatically rebased without conflicts.

[openjdk]

@plummercj Pushed as commit 9638050.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.