ora - 07445

Hi...!!!
 Error - 7445 and the description on Metalink.  I have got another arguments then the described in the document. I opened an iTAR with previous employer and
oracle said this is not gonna corrupt yr database. Neither at physical or logical level.
 Is the arguments really matters? The query given with this is very simple select query.
 Any idea ??? I don have much idea about the arguements but know that it says abt the kind of operation you were doing like.  Regards - Chirag
 ksedmp: internal or fatal error
ORA-07445: exception encountered: core dump [0000000101375D20] [SIGSEGV] [Address not mapped to object] [0x000000020] [] [] Current SQL statement for this session:
SELECT COUNT(*) FROM (SELECT PRIVILEGE FROM USER_SYS_PRIVS WHERE PRIVILEGE = 'CREATE USER'
UNION ALL SELECT PRIVILEGE FROM ROLE_SYS_PRIVS WHERE PRIVILEGE = 'CREATE USER')      Doc ID: Note:278302.1
Subject: ORA-07445 OCCURS DURING SHUTDOWN OPERATION IN FUNCTIONS KPOGUP OR LMXSPAX
Type: PROBLEM
Status: PUBLISHED
Content Type: TEXT/X-HTML
Creation Date: 13-JUL-2004
Last Revision Date: 20-AUG-2004  

The information in this article applies to: Oracle Server - Enterprise Edition - Version: 8.1.7.4 <http://8.1.7.4> to 9.2.0.7 <http://9.2.0.7>
This problem can occur on any platform.

Errors

The following errors have all been observed for the this issue:-

ORA-07445[KPOGUP]
ORA-07445[LXMSPAX]
ORA-07445[SIGSEGV] [ADDRESS NOT MAPPED TO OBJECT]

Symptoms
All of the following symptoms will be observed

1. The failing functions KPOGUP or LXMSPAX will be reported in the 7445 error and the function KPOGUP will be reported in the stack trace OR (b)
2. The failing function KPOGUP will be reported in the stack trace and the 7445 error will contain SIGSEGV
3. The ORA-07445 will be reported after a SHUTDOWN IMMEDIATE operation.
4. The current SQL session will report : Current SQL information unavailable - no session.
5. Crash/Media recovery is not affected on startup

The stack will be similar to:-
sigacthandler kpogup kpofli kpolon opiodr ttcpip opitsk opiino opiodr opidrv

sou2o main start

OR

ksedmp ssexhd sigacthandler lxmspax kpogup kpofli kpolon opiodr ttcpip opitsk
opiino opiodr opidrv sou2o main start

The key function that needs to be present in the stack trace is KPOGUP Cause
The root cause of the problem relates to which addresses an issue in accessing
NLS object list information during SHUTDOWN IMMEDIATE. There is no impact to the database
other than a 7445 trace file taking space on disk.

Fix

The fix is provided in Oracle10g but due to the architectural changes required is not backportable to earlier releases. There is no recommended workaround for this error as it has no impact to the database and no known set of circumstances that avoid/cause it.

References
<BUG:2295368> - Race Condition In Shutdown Immediate And Nls/Sga Fetch
<BUG:2554103> - Ora-07445 Dump [Lxmspax()+40] [Sigsegv] [Address Not Mapped
To Object] With Oex

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