8359327: Incorrect AVX3Threshold results into code buffer overflows on APX targets

[TobiHartmann]

Hi all,

This pull request contains a backport of commit e7f63ba3 from the openjdk/jdk repository.

The commit being backported was authored by Jatin Bhateja on 13 Jun 2025 and was reviewed by Sandhya Viswanathan.

Thanks!

---

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-8359327: Incorrect AVX3Threshold results into code buffer overflows on APX targets (Bug - P3)

Reviewers

• Christian Hagedorn (@chhagedorn - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/25796/head:pull/25796
$ git checkout pull/25796

Update a local copy of the PR:
$ git checkout pull/25796
$ git pull https://git.openjdk.org/jdk.git pull/25796/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 25796

View PR using the GUI difftool:
$ git pr show -t 25796

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/25796.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back thartmann! 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]

@TobiHartmann 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:

8359327: Incorrect AVX3Threshold results into code buffer overflows on APX targets

Reviewed-by: chagedorn

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:

• 3877746: 8359181: Error messages generated by configure --help after 8301197
• 3bd80fe: 8357782: JVM JIT Causes Static Initialization Order Issue
• 03232d4: 8359200: Memory corruption in MStack::push
• ... and 2 more: https://git.openjdk.org/jdk/compare/839a91e14b3d11f0baddcaff5eb98c1ebccd44f1...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]

@TobiHartmann The following label will be automatically applied to this pull request:

• hotspot

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

[mlbridge]

Webrevs

• 00: Full (d9dc1fe2)

[chhagedorn]

Looks good!

[TobiHartmann]

Thanks Christian!

[TobiHartmann]

/integrate

[openjdk]

Going to push as commit 2a32945.
Since your change was applied there have been 5 commits pushed to the jdk25 branch:

• 3877746: 8359181: Error messages generated by configure --help after 8301197
• 3bd80fe: 8357782: JVM JIT Causes Static Initialization Order Issue
• 03232d4: 8359200: Memory corruption in MStack::push
• ... and 2 more: https://git.openjdk.org/jdk/compare/839a91e14b3d11f0baddcaff5eb98c1ebccd44f1...jdk25

Your commit was automatically rebased without conflicts.

[openjdk]

@TobiHartmann Pushed as commit 2a32945.

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