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IV09185: HIGH CPU USAGE OCCURS FOR WEBSPHERE MQ V7 AMQZMUR0 PROCESS.

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APAR status

  • Closed as program error.

Error description

  • High cpu usage observed for amqzmur0 WebSphere MQ V7 process.
    MQ trace file shows an infinite loop on the amqzmur0 main
    thread and return code xecX_E_NO_SUCH_PIPE:
    
    Thread stack
    -> amqzmur0
    -> zmuShutdownPhase
    -> zmuStopThisTask
    -> kpiStopAppSignalTask
    -> xcsConnectSimplePipe
    ----{ xcsConnectSimplePipe
    -----{ xcsQueryValueForSubpool
    -----} xcsQueryValueForSubpool rc=OK
    -----{ xcsQueryValueForSubpool
    -----} xcsQueryValueForSubpool rc=OK
    -----{  xcsGetMemFn component:23 function:466 length:2064
    options:0 cbmindex:0 *pointer:1101a8c48
    -----}  xcsGetMemFn rc=OK
    -----{ xcsSetSocketAddress
    -----} xcsSetSocketAddress rc=OK
    Data: 0x00000007
    -----{  xcsFreeMemFn
    component:23 pointer:1101a8c48
    cbmindex:0
    -----} xcsFreeMemFn rc=OK
    ----}! xcsConnectSimplePipe rc=xecX_E_NO_SUCH_PIPE
    Connecting to pipe: 0
    ----{ xcsConnectSimplePipe
    -----{ xcsQueryValueForSubpool
    -----} xcsQueryValueForSubpool rc=OK
    -----{ xcsQueryValueForSubpool
    -----} xcsQueryValueForSubpool rc=OK
    -----{  xcsGetMemFn component:23 function:466 length:2064
    options:0 cbmindex:0 *pointer:1101a8c48
    -----}  xcsGetMemFn rc=OK
    -----{ xcsSetSocketAddress
    -----} xcsSetSocketAddress rc=OK
    Data: 0x00000007
    -----{  xcsFreeMemFn
    component:23 pointer:1101a8c48
    cbmindex:0
    -----} xcsFreeMemFn rc=OK
    ----}! xcsConnectSimplePipe rc=xecX_E_NO_SUCH_PIPE
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users making use of the Asynchronous Consume aspect of WebSphere
    MQ may be exposed to this problem.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    If the utility manager (amqzmur0) fails to stop an application
    signal task (for unspecified reasons), it may retry indefinitely
    

Problem conclusion

  • The retry logic has now been limited to a maximum of 5 times.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.8
    --------           --------------------
    Windows            U200335
    AIX                U845856
    HP-UX (PA-RISC)    U847965
    HP-UX (Itanium)    U847970
    Solaris (SPARC)    U847966
    Solaris (x86-64)   U847972
    iSeries            7.0.1.8
    Linux (x86)        U847967
    Linux (x86-64)     U847971
    Linux (zSeries)    U847968
    Linux (Power)      U847969
    
                       v7.1
    Platform           Fix Pack 7.1.0.1
    --------           --------------------
    Windows            7.1.0.1
    AIX                7.1.0.1
    HP-UX (PA-RISC)    7.1.0.1
    HP-UX (Itanium)    7.1.0.1
    Solaris (SPARC)    7.1.0.1
    Solaris (x86-64)   7.1.0.1
    iSeries            7.1.0.1
    Linux (x86)        7.1.0.1
    Linux (x86-64)     7.1.0.1
    Linux (zSeries)    7.1.0.1
    Linux (Power)      7.1.0.1
    
    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

    IV09185

  • Reported component name

    WMQ AIX V7

  • Reported component ID

    5724H7221

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-10-19

  • Closed date

    2011-12-29

  • Last modified date

    2012-01-19

  • 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

  • R701 PSY

       UP

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Document Information

Modified date:
19 January 2012