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  1. JDK
  2. JDK-8173013

JVMTI tagged object access needs G1 pre-barrier

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Details

    • Bug
    • Resolution: Fixed
    • P3
    • 9
    • 9
    • hotspot
    • gc
    • b159
    • generic
    • generic

    Backports

      Description

        JvmtiTagHashmapEntry has a bare oop member. These are weak references. Any place that allows that oop to "escape" needs the G1 pre-barrier.

        GetObjectsWithTags provides such an escape path. All other accesses to that oop appear to be "peek" operations, where the oop is locally examined without any possibility of a safepoint while it's being used. Without that barrier, use of this JVMTI function with G1 can lead to crashes.

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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-8176678 JVMTI tagged object access needs G1 pre-barrier

            • 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-8201583 JVMTI tagged object access needs G1 pre-barrier

            • 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-8208888 JVMTI tagged object access needs G1 pre-barrier

            • 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-8216708 JVMTI tagged object access needs G1 pre-barrier

            • P3 - Major loss of function.
            • Resolved
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8166188 G1 Needs pre barrier on dereference of weak JNI handles

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

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                sangheki Sangheon Kim
                kbarrett Kim Barrett
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                  Created:
                  Updated:
                  Resolved: