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  1. JDK
  2. JDK-6681646

Relocking of a scalar replaced object during deoptimization is broken.

    Details

    • Subcomponent:
    • Resolved In Build:
      b02
    • CPU:
      x86
    • OS:
      solaris_10
    • Verification:
      Verified

      Backports

        Description

        PIT testing of 6u5p got failures in nsk tests when runnning with EA and BiasedLocking.
        Tests passed with EA or BiasedLocking switched off.

        The test failed when trying exit the monitor after deoptimization
        of the compiled method with eliminated lock of scalar replaced
        object.

        When scalarized object is reallocated the mark word is set
        to klass->prototype_header() by default. Which can have biased pattern.

        But the lock should not be biased in order to safely move
        the displaced mark word from the compiled frame
        to the vframeArray and back to the interpreted frame.

        Affected tests:
        # Internal Error (synchronizer.cpp:1803), pid=XXX, tid=XXX
        # Error: guarantee(mid->header()->is_neutral(),"invariant")

        nsk/stress/jck12a/jck12a011
        nsk/stress/jck12a/jck12a015
        nsk/stress/jck12a/jck12a016
        nsk/stress/jck12a/jck12a017
        nsk/stress/jck60/jck60011
        nsk/stress/jck60/jck60013
        nsk/stress/jck60/jck60016
        nsk/stress/jck60/jck60017
        nsk/stress/jck60/jck60018
        nsk/stress/jck60/jck60019
        nsk/stress/jck60/jck60021
        I see the following tests fail with the same assertion:
        nsk/monitoring/stress/thread/cmon002
        nsk/monitoring/stress/thread/cmon003

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                • Assignee:
                  kvn Vladimir Kozlov
                  Reporter:
                  kvn Vladimir Kozlov
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                  • Created:
                    Updated:
                    Resolved:
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