Symptoms

The application traps an error and then raises it with the procedure. For
some reason whenever a -6508 (and only that error) is raised, it gets an
ORA-600.

When raising the ora-6508 error an ora-600 is thrown.  

The following sql will reproduce these errors:
DECLARE myexc EXCEPTION; 
PRAGMA EXCEPTION_INIT(myexc, -6508); 
BEGIN 
RAISE myexc; 
END; 
/
DECLARE myexc EXCEPTION;
*
ERROR at line 1:
ORA-00081: address range [0x600000000009C570, 0x600000000009C574) is not
readable
ORA-00600: internal error code, arguments: [15419], [severe error during PL/SQL
execution], [], [], [], [], [], []
ORA-06544: PL/SQL: internal error, arguments: [77410], [], [], [], [], [], [],
[]
ORA-06553: PLS-801: internal error [77410]

Cause