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IV11260: WEBSPHERE MQ V7 QUEUE MANAGER ON AIX FAILS TO STOP AFTER ISSUING ENDMQM

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APAR status

  • Closed as program error.

Error description

  • A timing window exists during endmqm processing where a
    WebSphere MQ agent thread ends without responding to an
    application thread which results in the application thread
    waiting indefinitely.
    
    The endmqm command will not complete until all application
    threads have ended which makes the endmqm command appear to
    hang.
    
    This problem occurs only on AIX when endmqm is used in quiesced
    or wait shutdown mode.  A workaround is to use endmqm with the
    -i option.
    

Local fix

  • Try "endmqm -p" and if that fails to end the queue manager
    then kill the WebSphere MQ  queue manager processes as discussed
    in the WMQ v7 Information Center under the section
    "Stopping queue managers in  WebSphere MQ for UNIX systems".
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users that end their queue managers in quiesced or wait shutdown
    mode
    
    Platforms affected:
    AIX
    
    ****************************************************************
    PROBLEM SUMMARY:
    A quiesced WebSphere MQ queue manager will only end once all
    applications have disconnected and all agent processes have
    ended.
    
    A timing issue where a particular flag was briefly set caused
    an agent thread to end early. The agent was still in
    conversation with an application thread which was waiting
    indefinitely for a reply on a semaphore. The application never
    received a reply which meant that it never ended. This
    prevented the queue manager from ending.
    

Problem conclusion

  • The code was changed so that the agent thread would not end
    early if the timing issue occurred.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.8
    --------           --------------------
    AIX                U845856
    
    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

    IV11260

  • Reported component name

    WMQ AIX V7

  • Reported component ID

    5724H7221

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-11-25

  • Closed date

    2012-01-20

  • Last modified date

    2012-01-20

  • 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 AIX V7

  • Fixed component ID

    5724H7221

Applicable component levels

  • R700 PSY

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Document Information

Modified date:
20 January 2012