oracle  Bug 8833280

Applies to:

Oracle Server - Standard Edition - Version: 10.2.0.4 and
later   [Release: 10.2 and later
]

Information in this document applies to any platform.

Symptoms

=== ODM Issue Clarification ===

Database goes in hang mode. Not able to make any new connections
and not able to perform any

operations on existing connections. It happens frequently.

The alert.log shows enteries like:-

Thu Oct 7 22:15:14 2010

ksvcreate: Process(m001) creation failed

Thu Oct 7 22:17:37 2010

kkjcre1p: unable to spawn jobq slave process

Thu Oct 7 22:17:37 2010

Errors in file
/orahome/oracle/ora10g/admin/WPCPRODB/bdump/wpcprodb_cjq0_1474640.trc:

Cause

The alert.log messages are not the cause , but result .PMON is
needed to create new processes and since PMON itself is hung , no
new processes can be started.

This is verified form Systemstate dump:-

--

OSD pid info: Unix process pid: 1519850, image: oracle@wpcdbqa
(PMON)

errorstack

kksLockWait+01fc<-kgxWait+0168<-kgxExclusive+00bc<-kksFreeHeapGetMutex+0228<-kksCursorFreeCallBack+0088<-kgllccl+13cc<-kgllcu+01b4

waiting for 'cursor: pin X' blocking sess=0x0 seq=8166 wait_time=0
seconds since wait started=0

    
idn=6e0a6074, value=20600000000, where|sleeps=b003c1e3a

Dumping Session Wait History

The holder of the mutex does not exist ( dead process)

Solution

This is due to a known bug

<< Bug
8426816>> PMON may hang cleaning up a
dead process (rare)

Details:

This problem is introduced in 10.2.0.4 by the fix for bug
5377099.

Under a very specific scenario involving process death at a
precise

point in time, an instance hang may result due to PMON
getting

blocked when attempting to clean up a failed process.

Rediscovery Notes:

PMON gets stuck during cleanup waiting for a mutex in X mode

and that mutex is held in X mode by the dead process being

cleaned up . PMON is blocked under a stack including

kksFreeHeapGetMutex()

Note:

One off patches for this bug also fix issue in bug 5377099 .

Action Plan:-

1)Please apply this patch to fix the issue.

or

2)The patch is also included in 10.2.0.4.2 PSU patch .

( which fixes other known issues of 10.2.0.4.0)

You may refer to note: 8833280.8

安徽-惜分飞<chf.dba@gmail.com> 
12:26:20

[ID 1233079.1

安徽-惜分飞<chf.dba@gmail.com> 
12:26:49

Bug 8833280