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IV55876: Synchronization issues with xlsThreadTermination/xcsDecrementQuickCellUseCount

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APAR status

  • Closed as program error.

Error description

  • Synchronization issues may happen in systems with high MQ
    connection/disconnections which leads to incorrect quickcell
    usecount. FDCs will be generated indicating the corrupted
    quickcells. Following FDCs with probe ids XC476004,XC034070,
    XC302005, XC014030 may be generated. The FDCs will have the
    function stack
     MQM Function Stack
    ExecCtrlrMain
    zxcProcessMessage
    zxcMQIRequest
    zxcConnectAgent
    xlsAbandonRecoveryToken
    xcsDecrementQuickCellUseCount
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue may occur on machines which has high number MQ
    connections and disconnections.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM SUMMARY:
    The synchronizing problem occurred because the quickcell
    usecount was not being calculated correctly.
    

Problem conclusion

  • The code changes have been made to include additional checks for
    the PID and prevent a partially initialized data structure from
    being used during MQCONN, thus eliminating the synchronization
    issue.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.5       7.5.0.4
    
    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

    IV55876

  • Reported component name

    WMQ AIX V7

  • Reported component ID

    5724H7221

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-02-25

  • Closed date

    2014-03-25

  • Last modified date

    2014-04-23

  • 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 AIX V7

  • Fixed component ID

    5724H7221

Applicable component levels

  • R701 PSY

       UP

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Document Information

Modified date:
23 April 2014