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IJ16199: Memory leak in amqzlaa0 process if events are enabled with topicaliases

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APAR status

  • Closed as program error.

Error description

  • The queue manager supports different types of events(e.g.
    Configuration events). If events are enabled then the event
    messages are put to specific event queues depending on the type
    of the event generated.  If these events are redirected to a
    different destination using a topic alias(e.g.
    SYSTEM.ADMIN.CONFIG.EVENT alias pointing to a topic) then a
    continual increase in memory usage is observed in amqzlaa0
    process.
    

Local fix

  • Disable events or use the default system event queues to store
    event messages
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users with one or more events enabled and a QALIAS to a topic is
    defined for the event queue
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    When trying to publish an event message to the topic that is
    used as an alias for the event queue, MQ  allocates some memory
    to store message properties. This memory was not freed
    correctly.
    

Problem conclusion

  • The MQ event message code has been modified to ensure that
    allocated memory is correctly freed after the event message had
    been published.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.14
    
    
    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

    IJ16199

  • Reported component name

    WMQ AIX V7

  • Reported component ID

    5724H7221

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-05-16

  • Closed date

    2019-09-27

  • Last modified date

    2019-09-27

  • 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

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0.1"}]

Document Information

Modified date:
27 February 2021