PM06896: SIGNAL 11 CRASH IN GC

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: Signal 11 Crash in GC with -Xgcpolicy:optavgpause
    because of objects being wrongly collected (java heap
    corruption).
    .
    Stack Trace: The problem can manifest in many different places.
    The most common functions the crash can be seen are,
    fastLocalMark()
    localMark()
    .
    Using st_verify_heap tracing it can be checked if java heap
    corruption is happening or not.
    

Local fix

  • If -Xgcpolicy:optavgpause is not used, problem will not happen.
    

Problem summary

  • Because of some bug in concurrent marking code, few objects were
    not marked as live and those objects were wrongly collected by
    GC.
    

Problem conclusion

  • This defect will be fixed in:
    1.4.2 SR13 FP4
    .
    The fix for this is to correct the bug in concurrent marking
    code to mark all the live objects correctly.
    .
    To obtain the fix:
    Install build 20100206 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM06896

  • Reported component name

    JAVA(1.3/1.4 CO

  • Reported component ID

    5648C9800

  • Reported release

    42A

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-02-05

  • Closed date

    2010-02-08

  • Last modified date

    2010-02-25

  • 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

    JAVA(1.3/1.4 CO

  • Fixed component ID

    5648C9800

Applicable component levels

  • R42A PSN

       UP

  • R42L PSN

       UP

  • R42W PSN

       UP

  • R420 PSN

       UP



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Document information


More support for:

z/OS family

Software version:

1.4.2

Reference #:

PM06896

Modified date:

2010-02-25

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