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  1. JDK
  2. JDK-8292877

java/util/concurrent/atomic/Serial.java uses {Double,Long}Accumulator incorrectly

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        JDK-8026344 added tests that subtly contradict the contract for `{Double,Long}Accumulator`-s, which breaks the tests on some platforms even in the single-threaded case.

        They use accumulators with binary plus as update function and using non-zero values as identity, which breaks once accumulators create many cells, reset their values to identity, and then apply the function over them, producing unexpected values.

        See the investigation on RISC-V here:
          https://mail.openjdk.org/pipermail/riscv-port-dev/2022-August/000594.html

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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-8299297 java/util/concurrent/atomic/Serial.java uses {Double,Long}Accumulator incorrectly

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • 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-8299298 java/util/concurrent/atomic/Serial.java uses {Double,Long}Accumulator incorrectly

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • 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-8299368 java/util/concurrent/atomic/Serial.java uses {Double,Long}Accumulator incorrectly

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • 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-8303339 java/util/concurrent/atomic/Serial.java uses {Double,Long}Accumulator incorrectly

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8026344 j.u.c.a *Adder and *Accumulator extend a package private class that is Serializable

            • P3 - Major loss of function.
            • Closed
            links to

            Commit Commit openjdk/jdk11u-dev/558eab22

            Commit Commit openjdk/jdk17u-dev/9729dad0

            Commit Commit openjdk/jdk/251bff6b

            Review Review openjdk/jdk11u-dev/1778

            Review Review openjdk/jdk17u-dev/985

            Review Review openjdk/jdk/10002

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                shade Aleksey Shipilev
                shade Aleksey Shipilev
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