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IC61566: Memory leak in the amqrmppa process when SHARECNV value is less than 2 or for pre-V7 MQ clients connecting to V7 queue manager.

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APAR status

  • Closed as program error.

Error description

  • The memory used by the channel pooling process (amqrmppa) grows
    continuously until it reaches the process limit, at which point
    resource errors start occurring.
    

Local fix

  • not sure
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Any users of WebSphere MQ with pre-V7 clients connecting to a
    V7 queue manager or with SVRCONN channels with a SHARECNV value
    of less than 2.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    The problem was caused by optimisation logic within the channel
    pooling process in order to reduce the performance overhead of
    managing a connection to the queue manager with a shared hConn.
    For pre-V7 clients or if the SHARECNV value is set to less than
    2, the channel pooling process does not require a shared hConn
    handle to the queue manager, so it disconnects and reconnects
    with a normal hConn. However, during this processing, the
    counter which tracks connections to the shared memory IPCC
    subpool became incorrect, leading to a failure to clean up
    connection resources when the thread disconnected from the queue
    manager. This would result in a memory leak of approximately 6Kb
    for every client connection to the queue manager.
    

Problem conclusion

  • WebSphere MQ was modified to ensure that the subpool connection
    counter in the channel pooling process was adjusted correctly
    when reconnecting to the IPCC subpool.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.0
    --------           --------------------
    Windows            U200306
    AIX                U823774
    HP-UX (PA-RISC)    U823665
    HP-UX (Itanium)    U823667
    Solaris (SPARC)    U823772
    Solaris (x86-64)   U824344
    iSeries            tbc_p700_0_1_0
    Linux (x86)        U823664
    Linux (x86-64)     U823773
    Linux (zSeries)    U823668
    Linux (Power)      U823666
    
    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

    IC61566

  • 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

    2009-06-18

  • Closed date

    2009-06-30

  • Last modified date

    2009-06-30

  • 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

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Document Information

Modified date:
30 June 2009