IBM Support

IV43799: ARRAYLET STATISTICS GATHERING MAY LEAD TO A CRASH IN PRESENCE OF CLASS UNLOADING

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: MM_IncrementalGenerationalGC::exportStats ()
    libj9gc26.so
     MM_IncrementalGenerationalGC::reportGCIncrementStart () from
    libj9gc26.so
     MM_IncrementalGenerationalGC::partialGarbageCollect () from
    libj9gc26.so
     MM_IncrementalGenerationalGC::runPartialGarbageCollect ()
    libj9gc26.so
     MM_IncrementalGenerationalGC::masterThreadGarbageCollect ()
    libj9gc26.so
     MM_MasterGCThread::masterThreadEntryPoint () from
    .
    

Local fix

  • This issue can be worked around using the gencon as the GC
    policy, or using the -Xnoclassgc option. Note however that
    option -Xnoclassgc will cause a memory increase over time as it
    prevents classes from being unloaded.
    

Problem summary

  • Balanced GC policy only. Verbose GC reports arraylet statistics
    and may relay on class info, which may be unavaliable at certain
    point of time.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR5
    6.0.1 SR6
    .
     Arraylet statistics gathering are updated to report if they
    contain class info that might be unloaded, preventing the
    exportStats() method from crashing.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV43799

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-06-04

  • Closed date

    2013-06-04

  • Last modified date

    2013-06-25

  • 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

    J9 COMMON CODE

  • Fixed component ID

    620700127

Applicable component levels

  • R260 PSY

       UP



Document information

More support for: Runtimes for Java Technology
Virtual Machine

Software version: 260

Reference #: IV43799

Modified date: 25 June 2013