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8265012: Shenandoah: Backout JDK-8264718 #3423



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@zhengyu123 zhengyu123 commented Apr 9, 2021

It turns out that enquening string deduplication candidates during concurrent root scanning may result lock rank inversion between stack watermark lock and string dedup queue lock, if the scanning is triggered by stack watermark and dedup buffer happens to be full.

Backout JDK-8264718 for now, will retry after Kim's string deduplication refactoring.


  • hotspot_gc_shenandoah


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  • Change must be properly reviewed




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Checkout this PR locally:
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Update a local copy of the PR:
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@bridgekeeper bridgekeeper bot commented Apr 9, 2021

👋 Welcome back zgu! 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 openjdk bot added the rfr label Apr 9, 2021
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@openjdk openjdk bot commented Apr 9, 2021

@zhengyu123 The following labels will be automatically applied to this pull request:

  • hotspot-gc
  • shenandoah

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing lists. If you would like to change these labels, use the /label pull request command.

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@mlbridge mlbridge bot commented Apr 9, 2021


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@shipilev shipilev left a comment

Looks fine.

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@openjdk openjdk bot commented Apr 10, 2021

@zhengyu123 This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file for details.

After integration, the commit message for the final commit will be:

8265012: Shenandoah: Backout JDK-8264718

Reviewed-by: shade

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:

  • 5784f6b: 8264948: Check for TLS extensions total length
  • 42f4d70: 8264649: runtime/InternalApi/ crash in fastdebug C2 with -XX:-UseTLAB
  • 76bd313: 8264872: Dependencies: Migrate to PerfData counters
  • 07c8ff4: 8264871: Dependencies: Miscellaneous cleanups in dependencies.cpp
  • 863feab: 8005295: Use mandated information for printing of repeating annotations
  • f26cd2a: 8264997: Remove SystemDictionary::cache_get
  • 9ebc497: 8264765: BreakIterator sees bogus sentence boundary in parenthesized “i.e.” phrase
  • ec31b3a: 8264727: Shenandoah: Remove extraneous whitespace from phase timings report

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.

@openjdk openjdk bot added the ready label Apr 10, 2021
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@zhengyu123 zhengyu123 commented Apr 12, 2021


@openjdk openjdk bot closed this Apr 12, 2021
@openjdk openjdk bot added integrated and removed ready rfr labels Apr 12, 2021
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@openjdk openjdk bot commented Apr 12, 2021

@zhengyu123 Since your change was applied there have been 18 commits pushed to the master branch:

  • be0d46c: 8262068: Improve G1 Full GC by skipping compaction for regions with high survival ratio
  • f71be8b: 8264954: unified handling for VectorMask object re-materialization during de-optimization
  • 3c9858d: 8264827: Large mapped buffer/segment crash the VM when calling isLoaded
  • e604320: 8264783: G1 BOT verification should not verify beyond allocation threshold
  • cb2806d: 8265018: [AIX] FileDispatcherImpl.c:31:10: fatal error: 'sys/mount.h' file not found
  • ecef1fc: 8264972: Unused TypeFunc declared in OptoRuntime
  • 440c34a: 8264644: Add PrintClassLoaderDataGraphAtExit to print the detailed CLD graph
  • b1ebf82: 8264358: Don't create invalid oop in method handle tracing
  • 627ad9f: 8262328: Templatize JVMFlag boilerplate access methods
  • c15680e: 8264868: Reduce inclusion of registerMap.hpp and register.hpp
  • ... and 8 more:

Your commit was automatically rebased without conflicts.

Pushed as commit 125184e.

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

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