8271855: [TESTBUG] Wrong weakCompareAndSet assumption in UnsafeIntrinsicsTest

[TheRealMDoerr]

We need a fix for test failures due to wrong assumption. (See JBS issue for details.) I suggest to give weakCompareAndSet several chances.

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Issue

• JDK-8271855: [TESTBUG] Wrong weakCompareAndSet assumption in UnsafeIntrinsicsTest

Reviewers

• Goetz Lindenmaier (@GoeLin - Reviewer)
• Tobias Hartmann (@TobiHartmann - Reviewer)

Reviewing

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[bridgekeeper]

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[TheRealMDoerr]

/label add hotspot-gc

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[mlbridge]

Webrevs

• 02: Full - Incremental (df3a553d)
• 01: Full - Incremental (f0a13417)
• 00: Full (f39bb85a)

[GoeLin]

Hi Martin,
why do you think 4 iterations are what you need?
I think you should add 8271855 to @bug.
Best regards,
Goetz

[TheRealMDoerr]

The test should usually pass within 2 iterations. It could happen that 2 different reasons make it fail (e.g. GC touches the cache line, OS takes the process from the CPU, interrupt occurs, ...). So, I think 2 iterations should usually work, 3 ones should be enough to prevent very sporadic failures in the future.

[GoeLin]

LGTM

[openjdk]

@TheRealMDoerr 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:

8271855: [TESTBUG] Wrong weakCompareAndSet assumption in UnsafeIntrinsicsTest

Reviewed-by: goetz, thartmann

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 18 new commits pushed to the master branch:

• 756d22c: 8274130: C2: MulNode::Ideal chained transformations may act on wrong nodes
• 5b0c9cc: 8274172: Convert JavadocTester to use NIO
• 2657bcb: 8274136: -XX:+ExitOnOutOfMemoryError calls exit while threads are running
• 53b25bc: 8273459: Update code segment alignment to 64 bytes
• 1a29b1e: 8274016: Replace 'for' cycles with iterator with enhanced-for in java.desktop
• d8a278f: 8274396: Suppress more warnings on non-serializable non-transient instance fields in client libs
• e49e5b5: 8273972: Multi-core choke point in CMM engine (LCMSTransform.doTransform)
• 2072bc7: 8274391: Suppress more warnings on non-serializable non-transient instance fields in java.util.concurrent
• 6a477bd: 8274415: Suppress warnings on non-serializable non-transient instance fields in java.xml
• 67e52a3: 8273634: [TEST_BUG] Improve javax/swing/text/ParagraphView/6364882/bug6364882.java
• ... and 8 more: https://git.openjdk.java.net/jdk/compare/6a573b888d4d3322b9165562f85e1b7b781a5ff1...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.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[TobiHartmann]

Looks good to me.

[TheRealMDoerr]

Thanks for the reviews!
/integrate

[openjdk]

Going to push as commit c4d1157.
Since your change was applied there have been 18 commits pushed to the master branch:

• 756d22c: 8274130: C2: MulNode::Ideal chained transformations may act on wrong nodes
• 5b0c9cc: 8274172: Convert JavadocTester to use NIO
• 2657bcb: 8274136: -XX:+ExitOnOutOfMemoryError calls exit while threads are running
• 53b25bc: 8273459: Update code segment alignment to 64 bytes
• 1a29b1e: 8274016: Replace 'for' cycles with iterator with enhanced-for in java.desktop
• d8a278f: 8274396: Suppress more warnings on non-serializable non-transient instance fields in client libs
• e49e5b5: 8273972: Multi-core choke point in CMM engine (LCMSTransform.doTransform)
• 2072bc7: 8274391: Suppress more warnings on non-serializable non-transient instance fields in java.util.concurrent
• 6a477bd: 8274415: Suppress warnings on non-serializable non-transient instance fields in java.xml
• 67e52a3: 8273634: [TEST_BUG] Improve javax/swing/text/ParagraphView/6364882/bug6364882.java
• ... and 8 more: https://git.openjdk.java.net/jdk/compare/6a573b888d4d3322b9165562f85e1b7b781a5ff1...master

Your commit was automatically rebased without conflicts.

[openjdk]

@TheRealMDoerr Pushed as commit c4d1157.

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