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IT18785: Memory leak in amqzlsa0 process

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APAR status

  • Closed as program error.

Error description

  • Analysis of the amqzlsa0 process indicates a gradual memory
    usage growth which does not reduce over time.
    

Local fix

  • Restarting the queue manager releases the accumulated memory of
    the amqzlsa0 processes.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of WebSphere MQ with applications using asynchronous
    message consumers and ISOLATED bindings.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A coding erorr in the MQ queue manager meant that not all
    allocated memory was correctly freed when one or more
    asynchronous consumers connected using ISOLATED bindings.
    

Problem conclusion

  • The MQ queue manager logic in this area has been modified to
    free allocated memory correctly.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.5       7.5.0.9
    v8.0       8.0.0.8
    v9.0 CD    9.0.4
    v9.0 LTS   9.0.0.3
    
    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

    IT18785

  • 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

    2017-01-19

  • Closed date

    2017-09-11

  • Last modified date

    2017-09-11

  • 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

  • R750 PSY

       UP



Document information

More support for: WebSphere MQ
APAR / Maintenance

Software version: 7.5

Reference #: IT18785

Modified date: 11 September 2017


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