IBM Support

IT13179: SIGSEGV in kqiShadowQListStatistics causing an issue with statistics gathering

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Probe Id          :- XC130004
    Component         :- xehExceptionHandler
    Program Name      :- amqzlaa0
    UserApp           :- FALSE
    Major Errorcode   :- STOP
    Minor Errorcode   :- OK
    Probe Type        :- HALT6109
    Probe Severity    :- 1
    Probe Description :- AMQ6109: An internal WebSphere MQ error has
    occurred.
    Arith1            :- 11 (0xb)
    Comment1          :- SIGSEGV: address not mapped(0x28b4)
    
    MQM Function Stack
    zlaMainThread
    zlaProcessMessage
    zlaProcessSPIRequest
    zlaSPIKernel
    zsqSPIKernel
    kpiGeneric
    lpiSPICollectStatistics
    kqiShadowQListStatistics
    xcsFFST
    
    The problem appears to be timing related and affects only a
    single thread responsible for statistics gathering. The rest of
    the queue manager and applications appear to be unaffected and
    will continue.  The statistics gathering will resume when the
    queue manager is restarted.
    

Local fix

  • Restart queue manager
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of WebSphere MQ V8 running with queue manager statistics
    enabled.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    An extremely rare race condition caused a memory access
    violation in an MQ agent process (amqlzaa0). This happened
    during queue statistic gathering. The affected process
    terminated with SIGSEGV.
    

Problem conclusion

  • The MQ code has been modified to prevent the potential race
    condition during statistic gathering.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.6
    v9.0 CD    9.0.4
    v9.0 LTS   9.0.0.1
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT13179

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-01-14

  • Closed date

    2016-09-30

  • Last modified date

    2017-06-01

  • 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

    WMQ BASE MULTIP

  • Fixed component ID

    5724H7251

Applicable component levels

  • R800 PSY

       UP

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Document Information

Modified date:
01 June 2017