IBM Support

IV10230: WebSphere MQ V7 CLIENT CHANNELS FAIL TO END COMPLETELY FOLLOWING BROKEN CONNECTION TO THE QUEUE MANAGER.

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APAR status

  • Closed as program error.

Error description

  • The DISPLAY CHANNEL STATUS command showed a number of channels
    as RUNNING for client applications which had disconnected due to
    an earlier error. The DISPLAY CONN command shows no connection
    for the channel.
    

Local fix

  • Restart the qmgr to clear the orphaned channels.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Queue Managers which host connections from v7 client
    applications which are using SHARECNV > 0.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    A timing condition in the SVRCONN thread in the amqrmppa
    process exists where the 2 threads responsible for the
    connection, are attempting to respond to a
    MQRC_CONNECTION_BROKEN reason code from the queue manager. The
    final stages of the client channel shutdown is that the primary
    thread must wait for secondary thread to complete, however the
    secondary thread is sometimes able to end without the primary
    thread being notified. The primary thread then waits
    indefinitely leaving the CHANNEL STATUS display showing a
    running channel for a client application which has disconnected.
    

Problem conclusion

  • When the async-consume is ending due to a CONNECTION_BROKEN
    reason code returned by the queue manager it ensures that the
    main channel thread is notified that it has ended.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.8
    --------           --------------------
    Windows            U200335
    AIX                U845856
    HP-UX (PA-RISC)    U847965
    HP-UX (Itanium)    U847970
    Solaris (SPARC)    U847966
    Solaris (x86-64)   U847972
    iSeries            7.0.1.8
    Linux (x86)        U847967
    Linux (x86-64)     U847971
    Linux (zSeries)    U847968
    Linux (Power)      U847969
    
                       v7.1
    Platform           Fix Pack 7.1.0.1
    --------           --------------------
    Windows            7.1.0.1
    AIX                7.1.0.1
    HP-UX (PA-RISC)    7.1.0.1
    HP-UX (Itanium)    7.1.0.1
    Solaris (SPARC)    7.1.0.1
    Solaris (x86-64)   7.1.0.1
    iSeries            7.1.0.1
    Linux (x86)        7.1.0.1
    Linux (x86-64)     7.1.0.1
    Linux (zSeries)    7.1.0.1
    Linux (Power)      7.1.0.1
    
    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

    IV10230

  • 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

    2011-11-04

  • Closed date

    2011-11-30

  • Last modified date

    2012-01-19

  • 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:
19 January 2012