8298138: Shenandoah: HdrSeq asserts "sub-bucket index (512) overflow for value ( 1.00)"

[shipilev]

Clean backport to eliminate a corner case in Shenandoah accounting code.

Testing:

• Linux AArch64 fastdebug gtests (new tests fail without the fix, pass with it)
• Linux AArch64 fastdebug hotspot_gc_shenandoah

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8298138: Shenandoah: HdrSeq asserts "sub-bucket index (512) overflow for value ( 1.00)"

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/1408/head:pull/1408
$ git checkout pull/1408

Update a local copy of the PR:
$ git checkout pull/1408
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/1408/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1408

View PR using the GUI difftool:
$ git pr show -t 1408

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/1408.diff

Webrev

Link to Webrev Comment

[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]

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

[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:

8298138: Shenandoah: HdrSeq asserts "sub-bucket index (512) overflow for value (    1.00)"

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 9 new commits pushed to the master branch:

• 109cc49: 8308880: [17u] micro bench ZoneStrings missed in backport of 8278434
• de8ec1d: 8293492: ShenandoahControlThread missing from hs-err log and thread dump
• ff0ee6d: 8301637: ThreadLocalRandom.current().doubles().parallel() contention
• bc78e07: 8293295: Add type check asserts to java_lang_ref_Reference accessors
• 213d0db: 8294183: AArch64: Wrong macro check in SharedRuntime::generate_deopt_blob
• b10ac57: 8274243: Implement fast-path for ASCII-compatible CharsetEncoders on aarch64
• 1684377: 8303809: Dispose context in SPNEGO NegotiatorImpl
• 6919ff2: 8301119: Support for GB18030-2022
• 3d32a20: 8286331: jni_GetStringUTFChars() uses wrong heap allocator

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
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.

[mlbridge]

Webrevs

• 00: Full (34524120)

[shipilev]

Testing is clean. Push approval is here.

/integrate

[openjdk]

Going to push as commit c9013a2.
Since your change was applied there have been 13 commits pushed to the master branch:

• 7765ba5: 8292698: Improve performance of DataInputStream
• 3d30c29: 8309107: Bump update version for OpenJDK: jdk-17.0.9
• a93cf5f: 8308884: [17u/11u] Backout JDK-8297951
• 8f65a6d: 8287876: The recently de-problemlisted TestTitledBorderLeak test is unstable
• 109cc49: 8308880: [17u] micro bench ZoneStrings missed in backport of 8278434
• de8ec1d: 8293492: ShenandoahControlThread missing from hs-err log and thread dump
• ff0ee6d: 8301637: ThreadLocalRandom.current().doubles().parallel() contention
• bc78e07: 8293295: Add type check asserts to java_lang_ref_Reference accessors
• 213d0db: 8294183: AArch64: Wrong macro check in SharedRuntime::generate_deopt_blob
• b10ac57: 8274243: Implement fast-path for ASCII-compatible CharsetEncoders on aarch64
• ... and 3 more: https://git.openjdk.org/jdk17u-dev/compare/6287df05cee5781da1c223ed6084d0b2fcc6959b...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit c9013a2.

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