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  1. JDK
  2. JDK-8252857

AArch64: Shenandoah C1 CAS is not sequentially consistent

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    • gc
    • b18
    • aarch64
    • linux

    Backports

      Description

        C1 atomic operations are supposed to be sequentially consistent by default but the variant in the Shenandoah C1 barrier set assembler isn't. It needs to call cmpxchg_oop with acquire/release set to true and then emit a trailing membar.

        Noticed this while debugging JDK-8252853 but it's actually not related.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8272986 AArch64: Shenandoah C1 CAS is not sequentially consistent

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            links to

            Commit Commit openjdk/jdk11u-dev/7cafcf4c

            Commit Commit openjdk/jdk/8e87d46f

            Review Review openjdk/jdk11u-dev/289

            Review Review openjdk/jdk/280

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                ngasson Nick Gasson
                ngasson Nick Gasson
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                  Created:
                  Updated:
                  Resolved: