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8277072: ObjectStreamClass caches keep ClassLoaders alive #869

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@rkennke rkennke commented Mar 9, 2022

Hi all,

This pull request contains a backport of commit 8eb453ba from the openjdk/jdk repository.

The commit being backported was authored by Roman Kennke on 10 Dec 2021 and was reviewed by Roger Riggs and Peter Levart.

It fixes a memory leak in ObjectStreamClass under certain conditions. See bug for details.
The backport was not clean, there have been some rather minor differences in context.



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


  • JDK-8277072: ObjectStreamClass caches keep ClassLoaders alive



Using git

Checkout this PR locally:
$ git fetch pull/869/head:pull/869
$ git checkout pull/869

Update a local copy of the PR:
$ git checkout pull/869
$ git pull pull/869/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 869

View PR using the GUI difftool:
$ git pr show -t 869

Using diff file

Download this PR as a diff file:

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@bridgekeeper bridgekeeper bot commented Mar 9, 2022

👋 Welcome back rkennke! 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 changed the title Backport 8eb453baebe377697286f7eb32280ca9f1fd7775 8277072: ObjectStreamClass caches keep ClassLoaders alive Mar 9, 2022
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@openjdk openjdk bot commented Mar 9, 2022

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

@openjdk openjdk bot added backport rfr labels Mar 9, 2022
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@mlbridge mlbridge bot commented Mar 9, 2022


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@TheRealMDoerr TheRealMDoerr left a comment


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@openjdk openjdk bot commented Mar 18, 2022

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

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

8277072: ObjectStreamClass caches keep ClassLoaders alive

Reviewed-by: mdoerr

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 40 new commits pushed to the master branch:

  • dbd14f7: 8277422: tools/jar/ fails with modified time mismatch
  • dfcef29: 8241707: introduce randomness k/w to hotspot test suite
  • b42dd74: 8280476: [macOS] : hotspot arm64 bug exposed by latest clang
  • 73dc222: 8257794: Zero: assert(istate->_stack_limit == istate->_thread->last_Java_sp() + 1) failed: wrong on Linux/x86_32
  • 6135540: 8223396: [TESTBUG] several jfr tests do not clean up files created in /tmp
  • 9543488: 8247592: refactor test/jdk/tools/launcher/
  • 62afe2e: 8166727: javac crashed: [jimage.dll+0x1942] ImageStrings::find+0x28
  • e1b2f92: 8279356: Method linking fails with guarantee(mh->adapter() != NULL) failed: Adapter blob must already exist!
  • 38e44eb: 8199874: [TESTBUG] runtime/Thread/ fails with "expected 0 to equal 10"
  • ebf6a5b: 8207364: nsk/jvmti/ResourceExhausted/resexhausted003 fails to start
  • ... and 30 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 18, 2022
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@GoeLin GoeLin commented Apr 1, 2022

Pre-submit failures: gcc missing, unrelated.

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@rkennke rkennke commented Apr 1, 2022


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@openjdk openjdk bot commented Apr 1, 2022

Going to push as commit 118ec61.
Since your change was applied there have been 106 commits pushed to the master branch:

Your commit was automatically rebased without conflicts.

@openjdk openjdk bot added the integrated label Apr 1, 2022
@openjdk openjdk bot closed this Apr 1, 2022
@openjdk openjdk bot removed ready rfr labels Apr 1, 2022
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@openjdk openjdk bot commented Apr 1, 2022

@rkennke Pushed as commit 118ec61.

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

@rkennke rkennke deleted the rkennke-backport-8eb453ba branch Apr 1, 2022
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backport integrated
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