IBM Support

IV99779: GC ASSERTION WHEN WALKING A JIT COMPILED FRAME

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APAR status

  • Closed as program error.

Error description

  • Error Message: Object neither in heap nor stack-allocated
    ...
    ** ASSERTION FAILED ** at
    ../../../../gc_glue_java/ScavengerRootScanner.hpp
    ((MM_StackSlotValidator(MM_StackSlotValidator::NOT_ON_HEAP,
    *slotPtr, stackLocation, walkState).validate(_env)))
    .
    Stack Trace: MM_ScavengerRootScanner::doStackSlot(J9Object**,
    void*, void const*) ()
    stackSlotIterator(J9JavaVM*, J9Object**, void*,
    J9StackWalkState*, void const*) ()
    vmThreadStackDoOSlotIterator(J9VMThread*, J9StackWalkState*,
    J9Object**, void const*) ()
    walkJITFrameSlotsForInternalPointers$AF137_66 ()
    IPRA.$walkJITFrameSlots ()
    IPRA.$jitWalkFrame ()
    jitWalkStackFrames ()
    walkStackFrames ()
    GC_VMThreadStackSlotIterator::scanSlots(J9VMThread*,
    J9VMThread*, void*, void (*)(J9JavaVM*, J9Object**, void*,
    J9StackWalkState*, void const*), bool, bool) ()
    MM_RootScanner::scanOneThread(MM_EnvironmentBase*, J9VMThread*,
    void*) ()
    MM_RootScanner::scanThreads(MM_EnvironmentBase*) ()
    MM_RootScanner::scanRoots(MM_EnvironmentBase*) ()
    .
    

Local fix

  • The problem can be avoided by using the option
    -Xjit:disableInternalPointers
    Note however this may have a minor performance impact.
    

Problem summary

  • This problem is caused by incorrectly marking native pointers as
    garbage collectable references. A GC assertion would occur when
    the GC tries to validate the native pointer as a java object.
    

Problem conclusion

  • The JIT compiler has been updated to stop marking native
    pointers as collectable references.
    .
    This APAR will be fixed in the following Java Releases:
       8    SR5       (8.0.5.0)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the available
    Service Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV99779

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-09-11

  • Closed date

    2017-09-11

  • Last modified date

    2017-09-11

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R130 PSY

       UP

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Document Information

Modified date:
11 September 2017