IBM Support

IT35366: Memory leak using Publish/Subscribe with large RFH2 headers

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APAR status

  • Closed as program error.

Error description

  • A memory leak
    can occur when processing an RFH2 header if the message size
    exceeds a certain threshold. A gradual increase will be seen in
    the amqzlaa0 process if this problem is encountered.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Publish/Subscribe users that use RFH2 processing for large
    payloads.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A memory leak occurred in the queue manager while processing
    large RFH2 headers. This problem resulted in a gradual increase
    in memory consumption for the amqzlaa0 process.
    

Problem conclusion

  • The queue manager RFH2 handling logic has been updated so that
    the leaked memory that was identified is now properly freed.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.1 LTS   9.1.0.11
    v9.2 LTS   9.2.0.5
    v9.x CD    9.2.5
    
    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

    IT35366

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7271

  • Reported release

    915

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-12-23

  • Closed date

    2021-12-21

  • Last modified date

    2021-12-21

  • 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 MP

  • Fixed component ID

    5724H7271

Applicable component levels

[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"915"}]

Document Information

Modified date:
22 December 2021