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8254565: JFR: Incorrect verification of mirror events #3600

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@egahlin egahlin commented Apr 21, 2021


Could I have a review of a fix that improves the verification of mirror events.

Mirror events is an internal mechanism used by JDK events that can't depend on the jdk.jfr module, today only events defined in java.base. The verification is a sanity check to make sure the field layout of the event and the mirror does not differ. The verification now verifies field type and it handles the unlikely case somebody adds a field to java.lang.Object (for experimentation) by always walking the whole class hierarchy of the mirror.

Testing: jdk/jdk/jfr



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


  • JDK-8254565: JFR: Incorrect verification of mirror events



Using git

Checkout this PR locally:
$ git fetch pull/3600/head:pull/3600
$ git checkout pull/3600

Update a local copy of the PR:
$ git checkout pull/3600
$ git pull pull/3600/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 3600

View PR using the GUI difftool:
$ git pr show -t 3600

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Download this PR as a diff file:

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@bridgekeeper bridgekeeper bot commented Apr 21, 2021

👋 Welcome back egahlin! 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.

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@openjdk openjdk bot commented Apr 21, 2021

@egahlin The following label will be automatically applied to this pull request:

  • hotspot-jfr

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

@openjdk openjdk bot added the hotspot-jfr label Apr 21, 2021
@egahlin egahlin marked this pull request as ready for review Apr 21, 2021
@openjdk openjdk bot added the rfr label Apr 21, 2021
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@mlbridge mlbridge bot commented Apr 21, 2021


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@openjdk openjdk bot commented Apr 21, 2021

@egahlin 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:

8254565: JFR: Incorrect verification of mirror events

Reviewed-by: mgronlun

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 19 new commits pushed to the master branch:

  • 7146104: 8265421: java/lang/String/ test is missing a memory requirement
  • b5c92ca: 8265106: IGV: Enforce en-US locale while parsing ideal graph
  • 3de0dcb: 8265483: All-caps “JAVA” in the top navigation bar
  • 739769c: 8265411: Avoid unnecessary Method::init_intrinsic_id calls
  • a22ad03: 8264983: Add gtest for JDK-8264008
  • 91b08b7: 8261779: JCK test api/javax_crypto/EncryptedPrivateKeyInfo/Ctor4.html is failing with assertion error when assertions enabled
  • 2fcd920: 8261183: Follow on to Make lists of normal filenames
  • 40ef00c: 8258457: testlibrary_tests/ctw/ fails with InvalidPathException on windows
  • 3f0da35: 8261392: Exclude testlibrary_tests/ctw/
  • 8d0faaf: 8257001: Improve Http Client Support
  • ... and 9 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 Apr 21, 2021
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@egahlin egahlin commented Apr 21, 2021


@openjdk openjdk bot closed this Apr 21, 2021
@openjdk openjdk bot added integrated and removed ready rfr labels Apr 21, 2021
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@openjdk openjdk bot commented Apr 21, 2021

@egahlin Since your change was applied there have been 31 commits pushed to the master branch:

  • f45d460: 8265017: runtime/HiddenClasses/ timed out on Win* OCI
  • 0136c89: 8265490: Unterminated string passed to FindClass() in hotspot test
  • 325edbc: 8265450: Merge PreservedMarksSet::restore code paths
  • b337f63: 8037397: RegEx pattern matching loses character class after intersection (&&) operator
  • 07a7510: 8200145: Conditional expression mistakenly treated as standalone
  • 41fc7dd: 8199079: Test javax/swing/UIDefaults/6302464/ is unstable
  • 45c474a: 8168408: Test java/awt/Focus/ActualFocusedWindowTest/ fails intermittentently on windows
  • 18ee419: 8198422: Test java/awt/font/StyledMetrics/ is unstable
  • da86029: 8265326: Strange Characters in G1GC GC Log
  • 7879adb: 8265343: Update Debian-based cross-compilation recipes
  • ... and 21 more:

Your commit was automatically rebased without conflicts.

Pushed as commit 7116321.

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

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