IBM Support

SE61652: Agent process AMQZLAA0 may consume CPU while generating FDCs in a loop

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • In certain circumstances, the MQ Agent process AMQZLAA0 may
    encounter an FDC situation. The agent process may loop writing
    repeated FDCs, resulting in the process consuming high CPU
    resources.
    
    FDC Data:
    LVLS :- 8.0.0.2
    Product Long Name :- WebSphere MQ for IBM i
    Vendor :- IBM
    O/S Registered :- 1
    Data Path :- /QIBM/UserData/mqm
    Installation Path :- /QIBM/ProdData/mqm
    License Type :- Unknown
    Probe Id :- KN836010
    Application Name :- MQM
    Component :- kqiCheckForImplicitClose
    SCCS Info :- /build/p800.P/src/lib/lqm/amqkopna.c,
    Line Number :- 1507
    Build Date :- Feb 17 2015
    Build Level :- p800-002-150217.2
    UserID :- 00000629 (QMQM)
    Job Name :- 071593/QMQM/AMQZLAA0 (AMQZLAA0)
    Activation Group :- 17 (QMQM) (QMQM/AMQZLAA0)
    UserApp :- FALSE
    Major Errorcode :- krcE.UNEXPECTED.ERROR
    Minor Errorcode :- OK
    Probe Type :- INCORROUT
    Probe Severity :- 2
    Probe Description :- AMQ6125: An internal WebSphere MQ error
    has occurred
    FDCSequenceNumber :- 4159
    Arith1 :- 0
    Arith2 :- 0
    +--------------------------------------------------
    ThreadMain 0000000177
    zlaCallMainThread 0000000002
    zlaMainThread 0000000131
    zlaProcessMessage 0000000028
    zlaProcessMQIRequest 0000000219
    zlaMQOPEN 0000000052
    zsqMQOPEN 0000000117
    kpiMQOPEN 0000000058
    kqiOpenIt 0000000087
    kqiOpenQueue 0000000125
    kqiCheckForImplicitClose 0000000041
    xcsFFSTSFn 0000000022
    xcsFFSTFn 0000000001
    xcsFFSTFnEx 0000000419
    PrepareDumpAreas 0000000011
    xfdDump400ThreadStack 0000000018
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    IBM MQ users at V8
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The agent process AMQZLAA0 may start generating FDCs in a loop
    which could in turn cause high CPU.
    

Problem conclusion

  • IBM MQ code has been changed to avoid the looping FDC which can
    cause high CPU.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.3
    
    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

    SE61652

  • Reported component name

    WMQ ISERIES V8.

  • Reported component ID

    5724H7254

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-04-09

  • Closed date

    2015-04-09

  • Last modified date

    2015-04-09

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Modules/Macros

  • RCHMGR
    

Fix information

  • Fixed component name

    WMQ ISERIES V8.

  • Fixed component ID

    5724H7254

Applicable component levels

  • R800 PSY

       UP

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Document Information

Modified date:
09 April 2015