i got it in 9i
SQL*Plus: Release 9.2.0.2.0 - Production on Thu Jan 30 02:06:46 2003

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.2.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.2.0 - Production

SQL> select a.file_name, b.phyrds + b.phywrts "Total I/O"
2 from dba_data_files a, v$filestat b
3 where a.file_id = b.file#
4 union
5 select a.file_name, b.phyrds "Total I/O"
6 from dba_temp_files a, v$filestat b
7 where a.file_id = b.file#
8 order by 2 desc;
select a.file_name, b.phyrds + b.phywrts "Total I/O"
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [ktfthcf-1], [203], [], [], [], [],
[], []