Oracle: ORA-00600: internal error code, arguments: [kqd-objerror$]

If this error occurs when trying to drop a trigger, e.g.

DROP TRIGGER RADIUS_DB.RADACCT_RADACCTID;

1. Find the object_id of the trigger

   select object_id from dba_objects where object_name='RADACCT_RADACCTID';

2. Insert the object_id into objerror$

   insert into sys.objerror$ values(126915);
   commit;

3. shutdown abort
4. startup
5. Retry to drop the trigger, this should be OK now.

   DROP TRIGGER RADIUS_DB.RADACCT_RADACCTID;