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IV47866: WEBSPHERE MQ V7, QUEUE MANAGER ENDS UNEXPECTEDLY WITH AN FDC WITH PROBE ID HL214091 FROM AMQZMUC0.

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APAR status

  • Closed as program error.

Error description

  • A WebSphere MQ v7 queue manager ends unexpectedly with FDCs
    being created. The first FDC has Probe Id HL214091 from process
    amqzmuc0. The FDC has:
     :
     Probe Id          :- HL214091
     Application Name  :- MQM
     Component         :- mllWriteLogPages
     SCCS Info         :- lib/logger/amqherr0.c, 1.21.2.1
     :
     Build Type        :- IKAP - (Production)
     Effective UserID  :- yyyy (mqm)
     Real UserID       :- yyyy (mqm)
     Program Name      :- amqzmuc0
     Addressing mode   :- 64-bit
     LANG              :- en_US
     Process           :- processid
     Thread            :- threadid
     QueueManager      :- queuemanager name
     UserApp           :- FALSE
     :
     Major Errorcode   :- hrcE_MQLP_NOSPACE
     Minor Errorcode   :- OK
     Probe Type        :- INCORROUT
     Probe Severity    :- 2
     Probe Description :- AMQ6125: An internal WebSphere MQ error
                          has occurred.
     FDCSequenceNumber :- 0
     .
     MQM Function Stack
     zmuThreadMain
     zmuLogIOTask
     mqlpgasn
     mllLoopWhilstDataToWrite
     mllWriteLogPages
     xcsFFST
     .
     MQM Trace History
     :
     -} WriteBuffers rc=hrcE_MQLP_NOSPACE
     :
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    It is unknown what causes this very rare problem and so it is
    not possible to identify who may be affected.
    
    Platforms affected:
    Windows,All Unix
    
    ****************************************************************
    PROBLEM SUMMARY:
    The MQ logger has mis-counted the log space in use. It is
    unclear why that has occurred. An extensive code investigation
    has revealed that FDC reporting can be improved; additional
    checks can be put in place to try and catch the problem earlier;
    and there are some issues in error handling cases of the logic
    involved.
    

Problem conclusion

  • The following changes have been made :-
    
    1) Improved reporting of FDCs that report count inconsistencies:
    the FDC that was reported, failed to provide the "log bytes in
    use" value.
    
    2) Additional checking to try and catch any count discrepancy
    earlier. The complex nature of the log space reservation makes
    it difficult, if not impossible, to catch a discrepancy right at
    the point it occurs. However, the earlier we can catch it the
    more likely we are to get some further clues as to what may have
    gone wrong.
    
    3) Correction of logic problems discovered in the error handling
    cases, that could potentially give rise to incorrect log space
    accounting.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.1       7.1.0.6
    v7.5       7.5.0.5
    
    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

    IV47866

  • Reported component name

    WMQ AIX V7

  • Reported component ID

    5724H7221

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-09-04

  • Closed date

    2013-12-19

  • Last modified date

    2014-07-18

  • 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 AIX V7

  • Fixed component ID

    5724H7221

Applicable component levels

  • R710 PSY

       UP

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.1"}]

Document Information

Modified date:
09 March 2021