IBM Support

IC64121: Queue manager terminates abnormally. An FDC with Probe ID XC130031 is produced in the amqzmuc0 process.

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • The queue manager terminated abnormally as the result of an
    access violation originating in the critical process manager
    (amqzmuc0). An FDC with Probe ID XC130031 exhibited the
    following stack at the time of the failure:
    
    zmuThreadMain
    zmuExpirerTask
    kpiExpirerTask
    apiGetMessage
    aqmGetMessage
    aqhGetMessage
    xcsGetMemFn
    xcsFFST
    
    The actual failure occurred during an operating system malloc
    operation indicative of a heap corruption within the process.
    The stack shows that MQ was attempting to expire messages at
    the time of the failure.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Any users of WebSphere MQ who are expiring a high volume of
    messages.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    The problem was caused due to the fact that the expirer thread
    was repeatedly reaching its expiry limit of 102 messages. This
    resulted in an error being returned from the get operation to
    the caller (the expirer thread). However, during get processing
    for expired messages, if the message does not fit into the
    buffer provided by the caller, MQ will allocate a larger buffer
    for the message and update a variable which tracks the size of
    the buffer. Under the error condition outlined above, MQ
    was returning the original buffer to the caller with the
    incorrect updated length. As a result, subsequent calls using
    the same buffer with the incorrect length would result in
    buffer overruns, thus corrupting the heap.
    

Problem conclusion

  • WebSphere MQ was modified to ensure that the buffer size is
    maintained correctly to reflect the actual buffer size on exit
    from the get processing routine.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.2
    --------           --------------------
    Windows            U200316
    AIX                U829807
    HP-UX (PA-RISC)    U829678
    HP-UX (Itanium)    U829681
    Solaris (SPARC)    U829806
    Solaris (x86-64)   U829680
    iSeries            tbc_p700_0_1_2
    Linux (x86)        U829677
    Linux (x86-64)     U829676
    Linux (zSeries)    U829682
    Linux (Power)      U829679
    
    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

    IC64121

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-10-26

  • Closed date

    2009-11-11

  • Last modified date

    2009-11-11

  • 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

    WMQ WINDOWS V7

  • Fixed component ID

    5724H7220

Applicable component levels

  • R700 PSY

       UP

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSCPQ63","label":"APAR \/ Maintenance"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
11 November 2009