8305931: jdk/jfr/jcmd/TestJcmdDumpPathToGCRoots.java failed with "Expected chains but found none"

[roberttoyonaga]

This is a backport of openjdk/jdk@65be5e0

This change to JFR test code is needed because TestJcmdDumpPathToGCRoots transiently fails because it can't guarantee the expected objects are sampled. The change improves cleanups between checks and also adds retries.

This should help resolve some test failures for Adoptium (see adoptium/aqa-tests#2766)

---

Progress

• JDK-8305931 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8305931: jdk/jfr/jcmd/TestJcmdDumpPathToGCRoots.java failed with "Expected chains but found none" (Bug - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/501/head:pull/501
$ git checkout pull/501

Update a local copy of the PR:
$ git checkout pull/501
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/501/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 501

View PR using the GUI difftool:
$ git pr show -t 501

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Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/501.diff

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[bridgekeeper]

👋 Welcome back roberttoyonaga! 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]

@roberttoyonaga 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:

8305931: jdk/jfr/jcmd/TestJcmdDumpPathToGCRoots.java failed with "Expected chains but found none"

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 116 new commits pushed to the master branch:

• b980e1c: 8328988: [macos14] Problem list LightweightEventTest.java which fails due to macOS bug described in JDK-8322653
• e9e042b: 8327631: Update IANA Language Subtag Registry to Version 2024-03-07
• f95de5b: 8320714: java/util/Locale/LocaleProvidersRun.java and java/util/ResourceBundle/modules/visibility/VisibilityTest.java timeout after passing
• 0dd4808: 8328540: test javax/swing/JSplitPane/4885629/bug4885629.java fails on windows hidpi
• f5c0d78: 8329961: Buffer overflow in os::Linux::kernel_version
• eec41a4: 8328589: unify os::breakpoint among posix platforms
• 807f21d: 8329545: [s390x] Fix garbage value being passed in Argument Register
• 1825464: 8329823: RISC-V: Need to sync CPU features with related JVM flags
• db750ff: 8320349: Simplify FileChooserSymLinkTest.java by using single-window testUI
• dc53669: 8318322: Update IANA Language Subtag Registry to Version 2023-10-16
• ... and 106 more: https://git.openjdk.org/jdk21u-dev/compare/d1af31b6098f4c55d05aa8693ff09f6dcc1e118a...master

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.

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➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[openjdk]

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

[openjdk]

⚠️ @roberttoyonaga This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (66894d66)

[roberttoyonaga]

/approval request for the clean backport of a JFR test fix for TestJcmdDumpPathToGCRoots. This only affects test code so should be a low risk.

[openjdk]

@roberttoyonaga
8305931: The approval request has been created successfully.

[roberttoyonaga]

/integrate

[openjdk]

@roberttoyonaga
Your change (at version 66894d6) is now ready to be sponsored by a Committer.

[jerboaa]

/sponsor

[openjdk]

Going to push as commit 8fa8e02.
Since your change was applied there have been 117 commits pushed to the master branch:

• fc7d8f8: 8326521: JFR: CompilerPhase event test fails on windows 32 bit
• b980e1c: 8328988: [macos14] Problem list LightweightEventTest.java which fails due to macOS bug described in JDK-8322653
• e9e042b: 8327631: Update IANA Language Subtag Registry to Version 2024-03-07
• f95de5b: 8320714: java/util/Locale/LocaleProvidersRun.java and java/util/ResourceBundle/modules/visibility/VisibilityTest.java timeout after passing
• 0dd4808: 8328540: test javax/swing/JSplitPane/4885629/bug4885629.java fails on windows hidpi
• f5c0d78: 8329961: Buffer overflow in os::Linux::kernel_version
• eec41a4: 8328589: unify os::breakpoint among posix platforms
• 807f21d: 8329545: [s390x] Fix garbage value being passed in Argument Register
• 1825464: 8329823: RISC-V: Need to sync CPU features with related JVM flags
• db750ff: 8320349: Simplify FileChooserSymLinkTest.java by using single-window testUI
• ... and 107 more: https://git.openjdk.org/jdk21u-dev/compare/d1af31b6098f4c55d05aa8693ff09f6dcc1e118a...master

Your commit was automatically rebased without conflicts.

[openjdk]

@jerboaa @roberttoyonaga Pushed as commit 8fa8e02.

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