8360048: NMT crash in gtest/NMTGtests.java: fatal error: NMT corruption: Block at 0x0000017748307120: header canary broken

[afshin-zafari]

The canary header test failed since there were concurrent remove and free() from the tree. The remove operations are synch'ed with corresponding NMT lock. The ReserveMemory::reserve() uses the same lock internally and is not included in the locked code block.

Tests: tier5 {macosx-aarch64, linux-x64, windows-x64} x {debug, release}

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Issue

• JDK-8360048: NMT crash in gtest/NMTGtests.java: fatal error: NMT corruption: Block at 0x0000017748307120: header canary broken (Bug - P2)

Reviewers

• Johan Sjölen (@jdksjolen - Reviewer)
• Gerard Ziemski (@gerard-ziemski - Reviewer)

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8360048: NMT crash in gtest/NMTGtests.java: fatal error: NMT corruption: Block at 0x0000017748307120: header canary broken

Reviewed-by: jsjolen, gziemski

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At the time when this comment was updated there had been 62 new commits pushed to the master branch:

• a49ecb2: 8352635: Improve inferencing of Float16 operations with constant inputs
• 7f702cf: 8360458: Rename Deferred<> to DeferredStatic<> and improve usage description
• bd666f9: 8360522: G1: Flag constraint functions for G1SATBBufferSize and G1UpdateBufferSize are skipped during argument validation
• ... and 59 more: https://git.openjdk.org/jdk/compare/3d35b408e1e69d7e3953af142c5bf606691fbeb8...master

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[mlbridge]

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[jdksjolen]

It would be good if we could remove the dependency on the global instance in the source code and create new VMT's for each test. That would make the tests less brittle.

[gerard-ziemski]

I think I asked about this before - can we do remove_all in the constructor to avoid this 2 line repeating pattern?

Otherwise looks good, can you please check the GHA test failures on Windows?

[jdksjolen]

I don't think that's the right way to go. I think it's better if we can avoid using the global instance, and not change the code of the VMT in order to appease the tests.

[gerard-ziemski]

Sure, I suggested the easiest fix I could think of, but doing it this way is even better!

[jdksjolen]

Nice!

[gerard-ziemski]

LGTM