8298061: vmTestbase/nsk/sysdict/vm/stress/btree/btree012/btree012.java failed with "fatal error: refcount has gone to zero"

[coleenp]

Please review this limited fix to make symbol refcount not go to zero for the placeholder supername field. This supername field is to detect ClassCircularityError for parallel capable class loaders without deadlocking.
ie. t1 : Class A (lock object for A) -> super B (wait for lock object for B)
t2: Class B (lock object for B) -> super A (wait for lock object for A).

We get the supername field out of the placeholder table to do the check for super class CCE but the reference count in the placeholder table for this name can be one. The fix is not to decrement and increment if the name is the same.

Retesting with tier1-4 in progress.

---

Progress

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Issue

• JDK-8298061: vmTestbase/nsk/sysdict/vm/stress/btree/btree012/btree012.java failed with "fatal error: refcount has gone to zero"

Reviewers

• Ioi Lam (@iklam - Reviewer)
• David Holmes (@dholmes-ora - Reviewer)

Reviewing

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$ git fetch https://git.openjdk.org/jdk20 pull/58/head:pull/58
$ git checkout pull/58

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$ git pull https://git.openjdk.org/jdk20 pull/58/head

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$ git pr checkout 58

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[bridgekeeper]

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[openjdk]

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[mlbridge]

Webrevs

• 01: Full - Incremental (23b6a0bc)
• 00: Full (68961fb7)

[iklam]

LGTM.

[openjdk]

@coleenp 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:

8298061: vmTestbase/nsk/sysdict/vm/stress/btree/btree012/btree012.java failed with "fatal error: refcount has gone to zero"

Reviewed-by: iklam, dholmes

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 5 new commits pushed to the master branch:

• ea40f29: 8298215: gc/g1/TestVerifyGCType.java failed with "Missing expected verification pattern Verifying After GC for: Pause Young (Prepare Mixed): expected true, was false"
• d0a7679: 4958969: ObjectOutputStream example leads to non-working code
• f07acfc: 8298699: java/lang/reflect/IllegalArgumentsTest.java times out with slowdebug bits
• 3e17e3c: 4512626: Non-editable JTextArea provides no visual indication of keyboard focus
• 188aaef: 8277074: Qualified exported types show up in JavaDoc

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
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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[dholmes-ora]

Seems reasonable. Thanks.

[coleenp]

Thanks for the reviews, Ioi and David.
/integrate

[openjdk]

Going to push as commit 03d9927.
Since your change was applied there have been 7 commits pushed to the master branch:

• 65fc058: 8298968: G1: Incorrect merged remset stats
• 3dd2cfa: 8298784: JFR: Test chunk integrity
• ea40f29: 8298215: gc/g1/TestVerifyGCType.java failed with "Missing expected verification pattern Verifying After GC for: Pause Young (Prepare Mixed): expected true, was false"
• d0a7679: 4958969: ObjectOutputStream example leads to non-working code
• f07acfc: 8298699: java/lang/reflect/IllegalArgumentsTest.java times out with slowdebug bits
• 3e17e3c: 4512626: Non-editable JTextArea provides no visual indication of keyboard focus
• 188aaef: 8277074: Qualified exported types show up in JavaDoc

Your commit was automatically rebased without conflicts.

[openjdk]

@coleenp Pushed as commit 03d9927.

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