8358748: Large page size initialization fails with assert "page_size must be a power of 2"

[nelanbu]

Hi all,

This pull request contains a backport of commit 40bc083 from the openjdk/jdk repository.

The commit being backported was authored by Yagmur Eren on 20 Aug 2025 and was reviewed by Albert Yang and David Holmes.

Thanks!

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• JDK-8358748 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8358748: Large page size initialization fails with assert "page_size must be a power of 2" (Bug - P4 - Approved)

Reviewers

• Albert Mingkun Yang (@albertnetymk - no project role)
• David Holmes (@dholmes-ora - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u.git pull/234/head:pull/234
$ git checkout pull/234

Update a local copy of the PR:
$ git checkout pull/234
$ git pull https://git.openjdk.org/jdk25u.git pull/234/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 234

View PR using the GUI difftool:
$ git pr show -t 234

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u/pull/234.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back nelanbu! 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]

@nelanbu 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:

8358748: Large page size initialization fails with assert "page_size must be a power of 2"

Reviewed-by: ayang, 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 98 new commits pushed to the master branch:

• 1df2f55: 8358556: Assert when running with -XX:-UseLibmIntrinsic
• cd99e8f: 8369947: Bytecode rewriting causes Java heap corruption on RISC-V
• 9d467de: 8370048: Shenandoah: Deprecated ShenandoahPacing option
• ... and 95 more: https://git.openjdk.org/jdk25u/compare/1482b6a0dba1440cb045b6c2f309de3c711ad674...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.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@dholmes-ora) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[openjdk]

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

[mlbridge]

Webrevs

• 00: Full (6a4fdf10)

[nelanbu]

/approval request
Low risk backport. It adds a constraint to the -XX:LargePageSizeInBytes option.

[openjdk]

@nelanbu
8358748: The approval request has been created successfully.

[dholmes-ora]

Looks good. Thanks

[nelanbu]

Thanks a lot for the review @dholmes-ora, @albertnetymk!

[nelanbu]

/integrate

[openjdk]

@nelanbu
Your change (at version 6a4fdf1) is now ready to be sponsored by a Committer.

[shipilev]

/sponsor

[openjdk]

Going to push as commit 1d44608.
Since your change was applied there have been 99 commits pushed to the master branch:

• 0a6cbb7: 8369656: Calling CompletableFuture.join() could execute task in common pool
• 1df2f55: 8358556: Assert when running with -XX:-UseLibmIntrinsic
• cd99e8f: 8369947: Bytecode rewriting causes Java heap corruption on RISC-V
• ... and 96 more: https://git.openjdk.org/jdk25u/compare/1482b6a0dba1440cb045b6c2f309de3c711ad674...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev @nelanbu Pushed as commit 1d44608.

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