8366223: ZGC: ZPageAllocator::cleanup_failed_commit_multi_partition is broken

[xmas92]

Hi all,

This pull request contains a backport of commit 501e6aed from the openjdk/jdk repository.

The commit being backported was authored by Axel Boldt-Christmas on 28 Aug 2025 and was reviewed by Stefan Karlsson and Joel Sikström.

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
• JDK-8366223 needs maintainer approval

Issue

• JDK-8366223: ZGC: ZPageAllocator::cleanup_failed_commit_multi_partition is broken (Bug - P2 - Approved)

Reviewers

• Stefan Karlsson (@stefank - Reviewer) 🔄 Re-review required (review applies to c1e2fc62)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u.git pull/141/head:pull/141
$ git checkout pull/141

Update a local copy of the PR:
$ git checkout pull/141
$ git pull https://git.openjdk.org/jdk25u.git pull/141/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 141

View PR using the GUI difftool:
$ git pr show -t 141

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u/pull/141.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

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[openjdk]

@xmas92 This change is no longer ready for integration - check the PR body for details.

[openjdk]

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

[openjdk]

⚠️ @xmas92 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

• 01: Full - Incremental (75e46aa4)
• 00: Full (c1e2fc62)

[openjdk]

@xmas92 Please do not rebase or force-push to an active PR as it invalidates existing review comments. Note for future reference, the bots always squash all changes into a single commit automatically as part of the integration. See OpenJDK Developers’ Guide for more information.

[xmas92]

Included the https://bugs.openjdk.org/browse/JDK-8366462 one-line change.

Reason:
While we only saw problems with the normal case introduced with https://bugs.openjdk.org/browse/JDK-8366147, it may theoretically still happen with the ZFakeNUMA case. So to reduce potential test noise.