PMON Processes Utilizing Excessive CPU [100%] in 10gR2 (Doc ID 1138755.1)

Last updated on FEBRUARY 15, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.2 to 10.2.0.4 [Release 10.2]
Information in this document applies to any platform.
***Checked for relevance on 15-Feb-2017***

Symptoms


PMON process is utilizing 100% of  CPU


To diagnose, ORADEBUG was used to dump callstack from pmon  [See Note: 1058210.6]:
oradebug dump errorstack 3

Call stack from generated trace file  shows:
nlepeget nserr2pe nserror nserrbc nserrbd nstoHandleEventTO nstoToqWalk nsevwait ksnwait ksliwat kslwaitns_timed kskthbwt kslwait ksuclnwt ksucln ksbrdp


Affected instances would not shutdown properly. A shutdown abort is needed to workaround the issue.

Cause

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