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8262001: java/lang/management/ThreadMXBean/ failed with "RuntimeException: Current Peak = 14 Expected to be == previous peak = 7 + 8" #2885

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@alexmenkov alexmenkov commented Mar 9, 2021

The fix updates test - increases number of threads, but relaxes conditions so start/termination of system threads don't cause failures.
Additional changes:

  • store threads in a list instead of array (we need only to start/terminate some number of threads, so linked list works better);
  • flags for thread termination are moved to thread class;
  • store values from ThreadMXBean.getPeakThreadCount() and getThreadCount() in int instead of long (the methods return int values)


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


  • JDK-8262001: java/lang/management/ThreadMXBean/ failed with "RuntimeException: Current Peak = 14 Expected to be == previous peak = 7 + 8"



To checkout this PR locally:
$ git fetch pull/2885/head:pull/2885
$ git checkout pull/2885

To update a local copy of the PR:
$ git checkout pull/2885
$ git pull pull/2885/head

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@bridgekeeper bridgekeeper bot commented Mar 9, 2021

👋 Welcome back amenkov! 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 Mar 9, 2021
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@openjdk openjdk bot commented Mar 9, 2021

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

  • core-libs
  • serviceability

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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@alexmenkov alexmenkov commented Mar 9, 2021

/label remove core-libs

@openjdk openjdk bot removed the core-libs label Mar 9, 2021
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@openjdk openjdk bot commented Mar 9, 2021

The core-libs label was successfully removed.

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@mlbridge mlbridge bot commented Mar 9, 2021


dfuch approved these changes Mar 9, 2021
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@dfuch dfuch left a comment

This looks like a good cleanup to me. Please wait for a review from someone from serviceability-dev before pushing.

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@openjdk openjdk bot commented Mar 9, 2021

@alexmenkov 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:

8262001: java/lang/management/ThreadMXBean/ failed with "RuntimeException: Current Peak = 14 Expected to be == previous peak = 7 + 8"

Reviewed-by: dfuchs, sspitsyn

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 142 new commits pushed to the master branch:

  • 26234b5: 8254979: Class.getSimpleName() returns non-empty for lambda and method
  • 83a49ef: 8263753: two new tests from JDK-8261671 fail with "Error. can not find ClassFileInstaller in test directory or libraries"
  • 24afa36: 8263726: divideToIntegralValue typo on BigDecimal documentation
  • cdf78e4: 8262298: G1BarrierSetC2::step_over_gc_barrier fails with assert "bad barrier shape"
  • 7674da4: 8262398: Shenandoah: Disable nmethod barrier and stack watermark when running with passive mode
  • 4f4ca0e: 8261671: X86 I2L conversion can be skipped for certain masked positive values
  • 5d87a21: 8263361: Incorrect arraycopy stub selected by C2 for SATB collectors
  • e152cc0: 8263677: Improve Character.isLowerCase/isUpperCase lookups
  • b63b5d4: 8263732: ProblemList serviceability/sa/ on ZGC
  • 000012a: 8148937: (str) Adapt StringJoiner for Compact Strings
  • ... and 132 more:

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 Mar 9, 2021
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@sspitsyn sspitsyn left a comment

This looks good to me.
The line needs a dot (was missed in the original code):
+ // The MyThread thread lives as long as correspondent its live value is true


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@alexmenkov alexmenkov commented Mar 18, 2021


@openjdk openjdk bot closed this Mar 18, 2021
@openjdk openjdk bot added integrated and removed ready rfr labels Mar 18, 2021
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@openjdk openjdk bot commented Mar 18, 2021

@alexmenkov Since your change was applied there have been 162 commits pushed to the master branch:

  • 01ddf3d: 8263622: The java.awt.color.ICC_Profile#setData invert the order of bytes for the "head" tag
  • e34f766: 8252723: Run also with C2-only
  • 2173fed: 8263439: getSupportedAttributeValues() throws NPE for Finishings attribute
  • e543a50: 8261352: Create implementation for component peer for all the components who should be ignored in a11y interactions
  • 21db0f6: 8263659: Reflow GTestResultParser for better readability
  • e333b6e: 8246494: introduce vm.flagless at-requires property
  • 8c8d1b3: 8263495: Gather liveness info in the mark phase of G1 full gc
  • a85dc55: 8263311: Watch registry changes for remote printers update instead of polling
  • 3f31a6b: 8263775: C2: igv_print() crash unexpectedly when called from debugger
  • 63eae8f: 8260605: Various java.lang.invoke cleanups
  • ... and 152 more:

Your commit was automatically rebased without conflicts.

Pushed as commit c82a673.

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

@alexmenkov alexmenkov deleted the peakThreadCountTest branch Mar 18, 2021
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