Before vall to oracle suport u can little bit explain problem.
U need - 1 number in error message - ora-600 ... [1 number],[],[]...
and alert log files.

1 number can say to u layer where error occured, for example -
[00000] - service layer
...
[17000] - generic layer
...
(all list u can find on metalink)

and u can check alert files in $ORACLE_BASE/$ORACLE_SID/bdump/...