This is part of alertlog ,i dont see ORA-09968 in it.

Tue Aug 21 15:57:53 2007
LMS 0: 0 GCS shadows traversed, 0 replayed
Tue Aug 21 15:57:53 2007
Submitted all GCS remote-cache requests
Post SMON to start 1st pass IR
Fix write in gcs resources
Reconfiguration complete
LCK0 started with pid=58, OS id=5979
Tue Aug 21 16:00:02 2007
sculkget: failed to lock /u01/app/oracle/product/10.2.0/db_1/dbs/lkinstMSBD1 exc
lusive
sculkget: lock held by PID: 4323
Oracle Instance Shutdown operation failed. Another process may be attempting to
startup or shutdown this Instance.
Failed to acquire instance startup/shutdown serialization primitive
Tue Aug 21 16:00:08 2007
Shutting down instance (abort)
License high water mark = 1
Instance terminated by USER, pid = 10092