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PM99345: GPF IN SYSTEMDATA GETCPUUTILIZATION OCCURS ON Z/OS WAS NODEAGENT

Fixes are available

8.5.5.2: WebSphere Application Server V8.5.5 Fix Pack 2
7.0.0.33: WebSphere Application Server V7.0 Fix Pack 33
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
8.5.5.3: WebSphere Application Server V8.5.5 Fix Pack 3
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
8.5.5.4: WebSphere Application Server V8.5.5 Fix Pack 4
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
8.5.5.6: WebSphere Application Server V8.5.5 Fix Pack 6
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14

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APAR status

  • Closed as program error.

Error description

  • The PMI code is collecting CPU utilization information.  It
    calls QueryMetrics which calls WLM function IWMWSYSQ.  There is
    a timing window, where when a WLM policy is activated, WLM can
    return back zero's for un-used CPU and used CPU.   As part of
    the WLM policy activation process , WLM to clears out the
    workload performance history.  If the QueryMetrics call that
    PMI code makes is done shortly after the policy activation, WLM
    may not have accumulated any new history data yet so all of the
    performance information is zero.  When the PMI code tries to do
    calculations using these zero values, it causes GPF.
    
    
    Java call stack for the GPF is:
    com/ibm/ws/pmi/server/system/SystemData.
       getCpuUtilization(Native Method)
    com/ibm/ws/pmi/server/system/SystemData.
       access200(SystemData.java:61(Compiled Code))
    com/ibm/ws/pmi/server/system/SystemDataCpuUtilization.
       get(SystemData.java:191(Compiled Code))
    com/ibm/ws/pmi/server/system/SystemData.
       getCpuUtilization(SystemData.java:221(Compiled Code))
    com/ibm/ws/pmi/server/modules/SystemModuleSystemPerfData.
       updateStatistic(SystemModule.java:83(Compiled Code))
    com/ibm/ws/pmi/server/data/SpdLongExternal.updateExternal
       (SpdLongExternal.java:88(Compiled Code))
    com/ibm/websphere/pmi/server/PmiAbstractModule.
       update(PmiAbstractModule.java:1342(Compiled Code))
    com/ibm/websphere/pmi/server/PmiAbstractModule.updateStatistics
       (PmiAbstractModule.java:1365(Compiled Code))
    com/ibm/ws/pmi/server/ModuleItem.updateStatisticsForStatsTree
       (ModuleItem.java:584(Compiled Code))
    com/ibm/ws/pmi/server/ModuleItem.getStats
       (ModuleItem.java:713(Compiled Code))
    com/ibm/ws/pmi/server/PmiRegistry.getStats
       (PmiRegistry.java:928(Compiled Code))
    com/ibm/ws/pmi/server/PmiRegistry.getStats
       (PmiRegistry.java:968(Compiled Code))
    com/ibm/ws/pmi/server/PmiCollaboratorImpl.getStatsArray
       (PmiCollaboratorImpl.java:348(Compiled Code))
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server V7.0, V8.0, and V8.5                 *
    ****************************************************************
    * PROBLEM DESCRIPTION: The GPF event is occuring on WebSphere  *
    *                      Application Server for z/OS from PMI    *
    *                      Native code at NodeAgent Process.       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The GPF event is occuring from PMI's native code when WLM
    policy which has been configured on a z/OS system get
    activated and at the same time PMI tries to get CPU Utilization
    of system for the SystemModule's counters. This is due to
    InValid System's CpuUsage value returned from z/OS System when
    WLM policy get activated.
    

Problem conclusion

  • The PMI Native code which is returning incorrect System's
    cpuUsage when WLM policy get activated and causing GPF event
    has been handled and so avoiding the issue.
    
    APAR PM99345 is currently targeted for inclusion in Fix Packs
    7.0.0.33, 8.0.0.9 and 8.5.5.2 of WebSphere Application Server.
    
    Please refer to URL:
    //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
    for Fix Pack availability.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM99345

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-10-17

  • Closed date

    2014-01-03

  • Last modified date

    2014-05-30

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

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

    PI19035

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R850 PSY

       UP



Document information

More support for: WebSphere Application Server for z/OS
General

Software version: 850

Reference #: PM99345

Modified date: 30 May 2014