Ora-07445 reported in the alert log file

Hi all,
We are using the following platform:-
OS: Solaris Operating System (SPARC 32-bit)
Oracle Server - Enterprise Edition / Product Version: 9.2.0.5.0
We encountered the following problem:-
There is Ora-07445 reported in the alert log file.
"ORA-07445: exception encountered: core dump [kgghash()+308] [SIGSEGV] [Address not mapped to object] [0x3222
000] [] []reported in the database."
These errors are signaled in more than 3 independent, unexplained, occurrences every day.
When this error occurred while User was accessing the application system, by right the case will be shown on the system, but they were no case found.
alert log are as below:-
Fri Jul 27 09:12:30 2007
Errors in file /disc3/oracle9205/RFDB/udump/rfdb_ora_27371.trc:
ORA-07445: exception encountered: core dump [kgghash()+340] [SIGSEGV] [Address not mapped to object] [0x3184000] [] []
Fri Jul 27 09:22:10 2007
Thread 1 advanced to log sequence 10730
Current log# 2 seq# 10730 mem# 0: /disc3/oracle9205/RFDB/RDO/logRFDB2a.rdo
Current log# 2 seq# 10730 mem# 1: /disc3/oracle9205/RFDB/RDO/logRFDB2b.rdo
Fri Jul 27 09:29:26 2007
Errors in file /disc3/oracle9205/RFDB/udump/rfdb_ora_27372.trc:
ORA-07445: exception encountered: core dump [kgghash()+296] [SIGSEGV] [Address not mapped to object] [0x3182000] [] []
The applications have encountered ora-3113 after a short period of time followed by ora-3114.
application log:-
RF0120-1 2007-Jul-27 09:46:57] Load m[RF0120-1 2007-Jul-27 09:29:30] SQLCODE: -3113
[RF0120-1 2007-Jul-27 09:29:30] Error Code -4105 returning from get score pan no.
[RF0120-1 2007-Jul-27 09:29:30] Message type :120
[RF0120-1 2007-Jul-27 09:29:30] Primary Account Number(PAN) DE0
02 :5440640155262702
[RF0120-1 2007-Jul-27 09:29:30] Processing code DE003 :003000
[RF0120-1 2007-Jul-27 09:29:30] Transaction amount DE004 :000000000001
[RF0120-1 2007-Jul-27 09:29:30] Settlement amount DE005 :000000000000
[RF0120-1 2007-Jul-27 09:29:30] Transmission Date and time
DE007 :0727092717
[RF0120-1 2007-Jul-27 09:29:30] Settlement conversion rate DE009 :60263158
[RF0120-1 2007-Jul-27 09:29:30] System trace audit no. DE011 :754710
[RF0120-1 2007-Jul-27 09:29:30] Local transaction time DE012 :092717
[RF0120-1 2007-Jul-27 09:29:30] Local transaction date DE013 :0727
[RF0120-1 2007-Jul-27 09:29:30] Expiration date D
E014 :0712
[RF0120-1 2007-Jul-27 09:29:30] Settlement date DE015 :0727
[RF0120-1 2007-Jul-27 09:29:30] Merchant type DE018 :5311
[RF0120-1 2007-Jul-27 09:29:30] Point-of-service(POS) entry code DE022 :051
[RF0120-1 2007-Jul-27 09:29:30] Acquiring inst. ID code DE032 :001912
[RF0120-1 2007-Jul-27 09:29:30] Forwarding Inst. ID code DE033 :001912
[RF0120-1 2007-Jul-27 09:29:30] Retrieval ref. no.
DE037 :754710356390
[RF0120-1 2007-Jul-27 09:29:30] Autholization ID response DE038 :356390
[RF0120-1 2007-Jul-27 09:29:30] Response code DE039 :00
[RF0120-1 2007-Jul-27 09:29:30] Card acceptor terminal ID DE041 :19306002
[RF0120-1 2007-Jul-27 09:29:30] Card acceptor ID code DE042 :000001106
020132
[RF0120-1 2007-Jul-27 09:29:30] Card acceptor Name/Location
What could have caused the above mentioned errors i.e Ora-07445 ; ora-3113 / ora-3114? How to resolve the problem.
Please help .
Thanks.

i am also facing the same some time in ora 9.2.0.6 on Sun OS 9 SPARC 64-bits
Errors in file /oracle/oracle9i/admin/FINPROD/udump/finprod_ora_6076.trc:
ORA-07445: exception encountered: core dump [0000000100FDE088] [SIGSEGV] [Address not mapped to object] [0x00000013A] [] []
Thu Aug 30 08:52:39 2007
Errors in file /oracle/oracle9i/admin/FINPROD/udump/finprod_ora_6078.trc:
ORA-07445: exception encountered: core dump [0000000100FDE088] [SIGSEGV] [Address not mapped to object] [0x00000013A] [] []
Thu Aug 30 09:41:49 2007

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