8373110: jstack --mixed frames are broken on macOS after JDK-8371194

[YaSuenag]

Hi all,

This pull request contains a backport of commit b848ddf6 from the openjdk/jdk repository.

The commit being backported was authored by Yasumasa Suenaga on 18 Dec 2025 and was reviewed by Chris Plummer and Kevin Walls.

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

Warning

 ⚠️ Found leading lowercase letter in issue title for 8373110: jstack --mixed frames are broken on macOS after JDK-8371194

Issue

• JDK-8373110: jstack --mixed frames are broken on macOS after JDK-8371194 (Bug - P3)

Reviewers

• David Holmes (@dholmes-ora - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/28958/head:pull/28958
$ git checkout pull/28958

Update a local copy of the PR:
$ git checkout pull/28958
$ git pull https://git.openjdk.org/jdk.git pull/28958/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 28958

View PR using the GUI difftool:
$ git pr show -t 28958

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/28958.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back ysuenaga! A progress list of the required criteria for merging this PR into jdk26 will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@YaSuenag 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:

8373110: jstack --mixed frames are broken on macOS after JDK-8371194

Reviewed-by: 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 no new commits pushed to the jdk26 branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the jdk26 branch, type /integrate in a new comment.

[openjdk]

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

[openjdk]

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

• serviceability

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 (611416d6)

[dholmes-ora]

LGTM.

[plummercj]

Looks good.

[YaSuenag]

/integrate

[openjdk]

Going to push as commit cece06f.
Since your change was applied there has been 1 commit pushed to the jdk26 branch:

• 8e0d736: 8373525: C2: assert(_base == Long) failed: Not a Long

Your commit was automatically rebased without conflicts.

[openjdk]

@YaSuenag Pushed as commit cece06f.

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