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  1. JDK
  2. JDK-8075006

Threads spinning infinitely in WeakHashMap.get running test262parallel

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    • Bug
    • Resolution: Fixed
    • P3
    • 9
    • 9
    • core-libs
    • b56
    • generic
    • generic

    Backports

      Description

        When running test262parallel, it sometimes hangs indefinitely. Looks like this happens because sometimes threads try to read the protoHistory of the same PropertyMap at the same time it is being modified, and this unfortunately can lead to an infinite loop in WeakHashMap due to the way it is written (it is not threadsafe):

        at java.util.WeakHashMap.get(WeakHashMap.java:403)
        at jdk.nashorn.internal.runtime.PropertyMap.checkProtoHistory(PropertyMap.java:687)
        at jdk.nashorn.internal.runtime.PropertyMap.changeProto(PropertyMap.java:886)
        at jdk.nashorn.internal.runtime.ScriptObject.setProto(ScriptObject.java:1288)
        ...

        It seems that in a multithreaded environment, PropertyMap.history and .protoHistory would need to be threadsafe. They're both caches with weak keys and soft values (WeakHashMap<K, SoftReference<V>>) and WeakHashMap is unfortunately not threadsafe.

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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-8076099 Threads spinning infinitely in WeakHashMap.get running test262parallel

            • P3 - Major loss of function.
            • 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-8079050 Threads spinning infinitely in WeakHashMap.get running test262parallel

            • P3 - Major loss of function.
            • 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-8085617 Threads spinning infinitely in WeakHashMap.get running test262parallel

            • P3 - Major loss of function.
            • 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-8087050 Threads spinning infinitely in WeakHashMap.get running test262parallel

            • P3 - Major loss of function.
            • 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-8138501 Threads spinning infinitely in WeakHashMap.get running test262parallel

            • P3 - Major loss of function.
            • Resolved

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                hannesw Hannes Wallnoefer
                attila Attila Szegedi
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                  Updated:
                  Resolved: