IBM Support

IT19290: MQ 9.0: ATTRIBUTE PSMODE WAS CHANGED IN QUEUE MANAGER TO NOT USE PUB/SUB, BUT FDC WAS ISSUED WITH MQRC_PUBSUB_INHIBITED

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APAR status

  • Closed as program error.

Error description

  • On IBM MQ 9.0, if the PSMODE queue manager attribute was set to
    DISABLED, a Failure Data Capture (FDC) record was generated when
    starting the queue manager:
    .
    | LVLS              :- 9.0.0.0
    | Probe Id          :- ZD030010
    | Component         :- zruOpenTopics
    | Program Name      :- amqzmuc0
    | Thread            :- 21    ResourceMonitor
    | Major Errorcode   :- MQRC_PUBSUB_INHIBITED
    | Probe Description :- AMQ6125: An internal IBM MQ error has
    occurred
    +-------------------------------------------------------------+
    MQM Function Stack
    zmuThreadMain
    zruResourceMonitor
    zruAsyncInit
    zruOpenTopics
    xcsFFST
    

Local fix

  • The user may be able to work around the FDC by setting the
    following environment variable before starting their queue
    manager:
      export AMQ_NO_SYSTEM_TOPICS=1
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users who disable publish/subscribe functionality by setting the
    PSMODE queue manager attribute to DISABLED may be affected by
    this
    problem.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The problem was caused by an internal resource monitor task
    attempting to publish statistics to a system topic when the
    queue manager publish subscribe functionality had been disabled.
    

Problem conclusion

  • The code has been modified so that the resource monitor task
    ends gracefully if it receives MQRC_PUBSUB_INHIBITED when trying
    to publish to a topic.  If the resource monitor task ends in
    this way then the following error message will be written to the
    queue manager error log:
    
    AMQ5041: The queue manager task 'RESOURCE_MONITOR' has ended.
    
    If PSMODE is changed to ENABLED or COMPAT then a queue manager
    restart will be necessary in order to re-enable the ability of
    the queue manager to publish messages to system topics, as
    described here:
    
    https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_9.0.0/com.
    ibm.mq.mon.doc/mo00040_.htm
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.0 CD    9.0.3
    v9.0 LTS   9.0.0.2
    
    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

    IT19290

  • 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

    2017-02-16

  • Closed date

    2017-04-25

  • Last modified date

    2017-07-25

  • 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

  • R900 PSY

       UP

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Document Information

Modified date:
25 July 2017