.Its a case of ORA-7445.
We have got ourselves into a situation where Oracle support is also not able to help us after 3 months of case being open.
We are still trying with them but now i am also looking into forums for any help.
Here is the issue.
We have XMLDB component installed for our Tibco Application.
Once in a week,at random times ,Tibco starts seeing timeouts and we start seeing row lock contention wait events for a below insert statement
Tibco App claims all inserts are auto committed.
When that happens we see the below in alert log being flooded.
ORA-07445: exception encountered: core dump [kgghash()+96] [SIGSEGV] [ADDR:0x1600000001] [PC:0x1001A40E0] [Address not mapped to object] 
ORA-07445: exception encountered: core dump [qmtxRemoveRef()+244] [SIGSEGV] [ADDR:0x48] [PC:0x10199AF34] [Invalid permissions for mapped object] 
The only way we get around the issue is we bounce the database and the listener.Its becoming a regular fact that now we are boucing production once a week .
Has anyone seen issues like above and is there anything we can do from Database level.?
Kindly suggest if someone has seen such issues.