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

Fixes are available

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 / Xsystem
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

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 April 2022

Tips

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

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

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

Fixed component ID

Applicable component levels

R850 PSY

Document Information

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