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IT10079: XC514090 xecL_W_LONG_LOCK_WAIT FDC from xlsRWMutexRequest when subscriptions are being added/removed dynamically

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APAR status

  • Closed as program error.

Error description

  • WMQ 7.5 onwards generates a failure data capture (FDC) record
    with probe id XC514090 from
    xlsRWMutexRequest with the following stack:
    
    MQM Function Stack
    MQCLOSE
    zstMQCLOSE
    zifMQCLOSE
    zsqMQCLOSE
    kpiMQCLOSE
    kqiCloseIt
    kqiCloseTopic
    kqiTopicDeregisterSubscriber
    xlsRWMutexRequest
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using WMQ 7.5 onwards with a publish/subscribe
    configuration where subscriptions are added/removed dynamically.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A logic error introduced a code path whereby an internal lock
    could fail to be released while deregistering a subscriber or
    removing a topic, which resulted in  the xecL_W_LONG_LOCK_WAIT
    condition being reported.
    

Problem conclusion

  • The publish-subscibe logic has been updated to release the lock
    correctly.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.5       7.5.0.8
    v8.0       8.0.0.6
    v9.0 CD    9.0.2
    v9.0 LTS   9.0.0.1
    
    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

    IT10079

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7241

  • Reported release

    750

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-07-15

  • Closed date

    2016-11-18

  • Last modified date

    2017-06-01

  • 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

    WMQ BASE MULTIP

  • Fixed component ID

    5724H7241

Applicable component levels

  • R750 PSY

       UP

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.5"}]

Document Information

Modified date:
26 August 2021