2.ORA-00600: internal error code, arguments: , , [0x3AE64C028], , , , , 
3.ORA-00600: internal error code, arguments: [kcbzwb_4], , , , , , , 
1. Possibly bug 5108130:
Making a reference in a PL/SQL block to a synonym at a remote site R1 when
the referent of the synonym was on yet another site R2 could have resulted
in an ORA-600  error. The PL/SQL block must have been compiled by
a 9.2.0.X or earlier compiler.
2. Possibly bug 5482174:
Deinstantiation of a large number of PLSQL objects that have opened cursors
when session_cached_cursors is non-zero might hit an ORA-600  
with a call stack of the form
repeated within it a number of times.
Set session_cached_cursors to zero.
3. Possibly bug 5028099:
ORA-600 [kcbzwb_4] can occur when using in memory undo (IMU)
for private buffers.