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IT28870: IBM MQ v9 probe ID AO221001 generated by amqzmuc0 process

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • A queue manager became unresponsive and its logs filled up after
    amqzmuc0 process hung generating  a failure data capture (FDC)
    record with the following
    information:
    .
    
    Probe Id          :- AO221001
    Component         :- apiFFSTForUnreleasedLock
    Program Name      :- amqzmuc0
    Major Errorcode   :- krcE_UNEXPECTED_ERROR
    Probe Description :- AMQ6125: An internal IBM MQ error has
    occurred.
    Comment1          :- TopicLockCount: 0
    
    
    MQM Function Stack
    zmuThreadMain
    zruResourceMonitor
    zruPublishLogUsage
    zruSendPCF
    MQPUT
    zstMQPUT
    zifMQPUT
    zsqMQPUT
    kpiMQPUT
    apiFFSTForUnreleasedLock
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of the publish/subscribe functionality of IBM MQ may be
    affected by this issue.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    An internal lock for a temporary dynamic queue was not released
    when it should have been.  There is a check at various points in
    the code to verify that there are no outstanding locks and if
    any are found then an apiFFSTForUnreleasedLock FDC is created.
    

Problem conclusion

  • The IBM MQ queue manager code was modified so that the lock was
    released at the appropriate time.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.0 LTS   9.0.0.9
    v9.1 CD    9.1.5
    v9.1 LTS   9.1.0.5
    
    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

    IT28870

  • 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

    2019-04-25

  • Closed date

    2020-02-10

  • Last modified date

    2020-02-10

  • 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

  • R900 PSY

       UP

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0"}]

Document Information

Modified date:
08 September 2021