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IC96842: WEBSPHERE MQ APPLICATION GENERATES AN FDC WITH PROBE ID XC130031 IN XEHEXCEPTIONHANDLER WITH ACCESS VIOLATION AT ADDRESS 00000010

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APAR status

  • Closed as program error.

Error description

  • A multithreaded WebSphere MQ application may fail when one
    thread disconnects an MQ connection while another thread is
    using it.  When this occurs, the application will generate an
    FDC with values similar to this:
    .
      Probe Id          :- XC130031
      Component         :- xehExceptionHandler
      Major Errorcode   :- xecF_E_UNEXPECTED_SYSTEM_RC
      Probe Description :- AMQ6109: An internal WebSphere MQ error
                           has occurred.
      Comment1          :- Access Violation at address 00000010
                           when reading
    .
    .
    In addition, the FDC may show a Stack Backtrace similar to this:
    .
      xcsReleaseThreadMutexSem+0x67
      reqGetConn+0x692
      rzstMQCLOSE+0xd9
      tmzstMQCLOSE+0x26f
      MQCLOSE+0x78
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users running multi threaded MQ applications
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    A memory access violation error occurs with the following
    function stack recorded in the FDC
    
    MQCLOSE
    reqGetConn
    xcsReleaseThreadMutexSem
    xcsFFST
    
    This error occurs when a thread tries to release the resources
    associated to a connection that is in an invalid state.
    

Problem conclusion

  • The code was modified to correct the memory access violation
    error.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.0       7.0.1.12
    
    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

    IC96842

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-10-11

  • Closed date

    2013-12-20

  • Last modified date

    2013-12-20

  • 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

  • R701 PSY

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Document Information

Modified date:
20 December 2013