IBM Support

IV58762: JAVA PROCESS HANGS DURING GARBAGE COLLECTION WHEN A JIT-COMPILED METHOD HAS A VERY LARGE STACK FRAME

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APAR status

  • Closed as program error.

Error description

  • Error Message: The JVM garbage collector hangs while walking
    the stack frame of a possibly very large JIT-compiled method.
    .
    Stack Trace:
    walkJITFrameSlots()
    jitWalkFrame()
    jitWalkStackFrames()
    walkStackFrames()
    GC_VMThreadStackSlotIterator::scanSlots()
    MM_RootScanner::scanOneThread()
    MM_RootScanner::scanThreads()
    MM_RootScanner::scanRoots()
    MM_ParallelScavenger::scavengeRoots()
    MM_ParallelScavenger::workThreadGarbageCollect()
    MM_ParallelScavengeTask::run()
    .
    

Local fix

  • The problem can be avoided if the JIT-compiled method owning
    the stack frame can be identified. The method can be excluded
    from compilation with -Xjit:exclude={*method_name*}, to prevent
    the GC from hanging.
    

Problem summary

  • The problem occurs when the JIT generates code for a method that
    requires a stack frame size that is larger than 32KB. This
    results in a field overflow when calculating a stack offset in
    the meta-data used by the stack walker. The overflow results in
    a near infinite loop in the walkJITFrameSlots() function.
    

Problem conclusion

  • The JIT has been modified so that it will abort any compilation
    that would result in a stack frame size that is larger than
    32KB.
    .
    This APAR will be fixed in the following Java Releases:
       6    SR16 FP2  (6.0.16.2)
       6 R1 SR8 FP2   (6.1.8.2)
       7    SR8       (7.0.8.0)
       7 R1 SR2       (7.1.2.0)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, Java maintenance is available
    from:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV58762

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-04-04

  • Closed date

    2014-07-18

  • Last modified date

    2014-10-28

  • 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

  • R600 PSY

       UP

  • R260 PSY

       UP

  • R130 PSY

       UP



Document information

More support for: Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version: 6.0

Reference #: IV58762

Modified date: 28 October 2014