Friday, April 4, 2014
ORA-00600: internal error code, arguments: , [0xnnnnnnnn], [threshold alerts latch], , 
We have found below error in alert.log for Oracle Database version 10.2.0.4
ORA-00600: internal error code, arguments: , [0x060030070], [threshold alerts latch], , , , , 
We never saw this error before and the only change that we applied on the server is OEM agent installation.
During the troubleshooting I found that these errors might occur after adding alerts for threshold values on tablespaces and faulty threshold/alert causing the MMON process to fail at the moment the thresholds were checked.
Find thresholds defined on the database
SQL>select dbms_server_alert.view_thresholds from dual;
I found many thresholds in the database and I have cleared all unnecessary thresholds. After removing the thresholds I didn’t see the error in the alert.log, it looks like the issue has been fixed.
I found that this is a known bug 5727166 and fixed in 10.2.0.5 and 184.108.40.206 and affected Oracle versions are 10.2.0.2 to 220.127.116.11 and the issue.
Hope this helps.
Satishbabu Gunukula, Oracle ACE