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  1. JDK
  2. JDK-8253284

Zero OrderAccess barrier mappings are incorrect

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    • b17

    Backports

      Description

        This happens at least on linux-zero-aarch64:

        $ shipilev-jdk/build/linux-aarch64-zero-release/images/jdk/bin/java -jar jcstress-latest.jar -m quick --jvmArgs "-Xint" -sc 64 -t memeffects.basic.volatiles

        org.openjdk.jcstress.tests.memeffects.basic.volatiles.volatile_byte_double [-Xint]: Observed forbidden state: 1, 0.0 (Seeing set guard, not seeing the updated value)
        org.openjdk.jcstress.tests.memeffects.basic.volatiles.volatile_int_long [-Xint]: Observed forbidden state: 42, 0 (Seeing set guard, not seeing the updated value)
        org.openjdk.jcstress.tests.memeffects.basic.volatiles.volatile_boolean_double [-Xint]: Observed forbidden state: true, 0.0 (Seeing set guard, not seeing the updated value)
        org.openjdk.jcstress.tests.memeffects.basic.volatiles.volatile_char_long [-Xint]: Observed forbidden state: A, 0 (Seeing set guard, not seeing the updated value)

        ...and it seems to happen because orderAccess_linux_zero.hpp defaults to compiler-only barriers for most OrderAccess::* calls.

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            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-8254230 Zero OrderAccess barrier mappings are incorrect

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            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-8255007 Zero OrderAccess barrier mappings are incorrect

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            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-8254281 Zero OrderAccess barrier mappings are incorrect

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-7143664 Clean up OrderAccess implementations and usage

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-8253036 [8u] Support building the Zero assembler port on AArch64

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

            Commit Commit openjdk/jdk/b9729cb4

            Review Review openjdk/jdk/224

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                shade Aleksey Shipilev
                shade Aleksey Shipilev
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                  Updated:
                  Resolved: