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IT14163: MEMORY LEAK IN AMQZLAA0

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APAR status

  • Closed as program error.

Error description

  • Over time one or more agent processes (amqzlaa0 or amqzlaa0.exe
    on Windows) accumulate gigabytes of memory, forcing the queue
    manager to be restarted to reclaim the memory.
    

Local fix

  • Restart the queue manager to release the excess memory.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using applications that consume messages which contain
    properties or MQRHF2 headers.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    This problem occurred because the memory allocated for
    MQRFH2/properties was not freed when an MQGET API call was
    internally re-issued by the queue manager logic in order to
    retrieve the message under a new unit of work.
    
    A trace of the agent process would show the apiGetMessage
    function returning the internal reason code
    lrcI_TRANSACTIONAL_NEXT. This reason code is correct and
    expected, however the path to handle this response did not
    correctly free allocated memory.
    

Problem conclusion

  • MQ has been modified to release the memory used to store
    properties data when the internal reason code
    lrcI_TRANSACTIONAL_NEXT is received.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.5       7.5.0.7
    v8.0       8.0.0.6
    
    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

    IT14163

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7241

  • Reported release

    750

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-03-07

  • Closed date

    2016-04-29

  • Last modified date

    2016-04-29

  • 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 BASE MULTIP

  • Fixed component ID

    5724H7241

Applicable component levels

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSCPQ63","label":"APAR \/ Maintenance"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.5","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
29 April 2016