I am newbie on oracle, this early morning , i encountered error messages as below
Export MSD48 terminated successfully with warnings.()
Error while exporting table...
Connected to: Oracle9i Enterprise Edition Release 188.8.131.52.0 - 64bit Production
With the Partitioning option
JServer Release 184.108.40.206.0 - Production
Export done in WE8ISO8859P1 character set and AL16UTF16 NCHAR character set
About to export specified tables via Direct Path ...
Current user changed to DPK
. . exporting table MSD48
EXP-00008: ORACLE error 600 encountered
ORA-00600: internal error code, arguments: , , , , , , , 
Export terminated successfully with warnings.
just set DIRECT=N during the export. (this is independend of OS and works with all current supported versions of Oracle).
To install the latest patchset you have to have access to MetaLink http://metalink.oracle.com/
there you can download the patchset and instructions how to install it.