IBM Support

IT36855: High memory utilization can occur in MQ channel processes if certificate renegotiation occurs many times

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APAR status

  • Closed as program error.

Error description

  • A queue manager running with TLS enabled may see significant
    increase
    in memory for the channel processes amqrmppa, runmqchl and
    amqcrsta
    over time.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using TLS enabled channels
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    Excessive caching of historical validation data in the GSKit
    cryptographic libraries used by MQ caused the process's memory
    usage to increase over time if TLS renegotiations were
    performed.
    

Problem conclusion

  • This issue is addressed by updating the level of the GSKit
    cryptographic libraries in use by MQ to GSKit 8.0.55.23 or
    later.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.2 LTS   9.2.0.3
    v9.x CD    9.2.3
    
    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

    IT36855

  • 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

    2021-05-11

  • Closed date

    2021-07-02

  • Last modified date

    2021-07-08

  • 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

  • R915 PSY

       UP

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Document Information

Modified date:
16 July 2021