8373630: r18_tls should not be modified on Windows AArch64

[shipilev]

Fixes Virtual Thread bug that affects JDK 24+.

Additional testing:

• GHA
• macos-aarch64-server-fastdebug, tier1

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8373630 needs maintainer approval

Issue

• JDK-8373630: r18_tls should not be modified on Windows AArch64 (Bug - P1 - Approved)

Reviewers

• Andrew Haley (@theRealAph - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/128/head:pull/128
$ git checkout pull/128

Update a local copy of the PR:
$ git checkout pull/128
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/128/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 128

View PR using the GUI difftool:
$ git pr show -t 128

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/128.diff

Using Webrev

Link to Webrev Comment

[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]

@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:

8373630: r18_tls should not be modified on Windows AArch64

Reviewed-by: aph

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 4 new commits pushed to the master branch:

• 23a396a: 8371978: tools/jar/ReproducibleJar.java fails on XFS
• 83d0cc1: 8371769: TestMemoryInvisibleParent.java fails with java.nio.file.AccessDeniedException
• c288508: 8367583: sun/security/util/AlgorithmConstraints/InvalidCryptoDisabledAlgos.java fails after JDK-8244336
• ... and 1 more: https://git.openjdk.org/jdk25u-dev/compare/4044c37d40cec86a80b1c07a95c2e05900b34df2...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.

[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 (d5bf5872)

[shipilev]

/approval request Fixes important Virtual Threads bug that affects JDK 24+. Applies cleanly. Testing passes. The patch is relatively recent, but it is also simple, and have no recorded bugtail after several weeks in mainline. Risk is low-medium: touches the core code, but in a simple manner.

[openjdk]

@shipilev
8373630: The approval request has been created successfully.

[shipilev]

Push approval granted.

/integrate

[openjdk]

Going to push as commit 84ee2e8.
Since your change was applied there have been 5 commits pushed to the master branch:

• c900b96: 8364936: Shenandoah: Switch nmethod entry barriers to conc_instruction_and_data_patch
• 23a396a: 8371978: tools/jar/ReproducibleJar.java fails on XFS
• 83d0cc1: 8371769: TestMemoryInvisibleParent.java fails with java.nio.file.AccessDeniedException
• ... and 2 more: https://git.openjdk.org/jdk25u-dev/compare/4044c37d40cec86a80b1c07a95c2e05900b34df2...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit 84ee2e8.

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