8370887: DelayScheduler.replace method may break the 4-ary heap in certain scenarios

[shipilev]

Backporting to fix the regression in JDK 25 feature, and to match 25.0.3-oracle.

Additional testing:

• macos-aarch64-server-fastdebug, new regression test fails without the test, passes with it

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8370887 needs maintainer approval

Issue

• JDK-8370887: DelayScheduler.replace method may break the 4-ary heap in certain scenarios (Bug - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/27/head:pull/27
$ git checkout pull/27

Update a local copy of the PR:
$ git checkout pull/27
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/27/head

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Checkout this PR locally:
$ git pr checkout 27

View PR using the GUI difftool:
$ git pr show -t 27

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/27.diff

Using Webrev

Link to Webrev Comment

[shipilev]

@GoeLin, I am going to re-use the existing approval from openjdk/jdk25u#394, if that's fine with you.

[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:

8370887: DelayScheduler.replace method may break the 4-ary heap in certain scenarios

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 8 new commits pushed to the master branch:

• cc103e3: 8368787: Error reporting: hs_err files should show instructions when referencing code in nmethods
• d28fd1f: 8370244: [PPC64] Several vector tests fail on Power8
• e0f7d70: 8372046: compiler/floatingpoint/TestSubNodeFloatDoubleNegation.java fails IR verification
• ... and 5 more: https://git.openjdk.org/jdk25u-dev/compare/7a07a621dc6b102ca1913ebd8d75065e469c61c1...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.

[mlbridge]

Webrevs

• 00: Full (572b7169)