IBM Support

IT31901: Memory leak in the AMS (Advanced Message Security) component of IBM MQ

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APAR status

  • Closed as program error.

Error description

  • Heap memory use from one or more amqrmppa or C client processes
    is seen to rise in an uncontrolled manner while using AMS.  If
    the queue manager is not restarted then resource error FDCs may
    be seen and the queue manager or C client application may be
    unable to continue to function.
    

Local fix

  • The impact of the problem can be lessened by restarting the
    affected C client application (if using client-side AMS
    interception), or queue manager (if using MCA interception) to
    reclaim memory.  Reducing the turnover of connections and open
    AMS protected queue handles will also help to reduce memory use.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of the IBM MQ AMS functionality where the quality of
    protection is set to Confidentiality may be affected by this
    problem.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    Memory allocated by IBM MQ to support the AMS functionality was
    not being freed.  This memory leak may be seen in the amqrmppa
    process, or in a C client application if client-side AMS is
    being used.
    

Problem conclusion

  • The IBM MQ code was modified to ensure that allocated memory was
    freed.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.0 LTS   9.0.0.12
    v9.1 LTS   9.1.0.7
    v9.2 LTS   9.2.0.2
    v9.x CD    9.2.2
    
    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

    IT31901

  • Reported component name

    IBM MQ BASE M/P

  • Reported component ID

    5724H7261

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-02-18

  • Closed date

    2020-11-10

  • Last modified date

    2020-11-10

  • 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

    IBM MQ BASE M/P

  • Fixed component ID

    5724H7261

Applicable component levels

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0"}]

Document Information

Modified date:
11 November 2020