how to fix a shared server issue?

This is more of a question for you guys.

In the alert log i have this:

Errors in file /oradb/app/oracle/admin/test/bdump/test_s003_123472.trc:
ORA-00600: internal error code, arguments: [ksudel1], [], [], [], [], [], [], []
ORA-00600: internal error code, arguments: [unable to load XDB library], [], [], [], [], [], [], []
Wed Nov  3 15:35:36 2010
found dead shared server 'S000', pid = (10, 2)
found dead shared server 'S001', pid = (24, 3)
found dead shared server 'S002', pid = (28, 1)
found dead shared server 'S003', pid = (29, 1)

And of course lots of trace files with test_s****.trc

Actually the solution I adopted is to make all connection on this database DEDICATED. So I changed everywhere SERVER=DEDICATED. And since then I had no error coming.

Do you have any ideas?