ora-00600 to check

02. What are recent changes OS / hardware / Database before these errors? 
03. Please provide following query results: 
conn /as sysdba 
set markup html on 
spool OutPut.html 
select * from dba_registry; 
select * from dba_objects where status='INVALID'; 
select * from registry$history; 
select substr(action_time,1,30) action_time,substr(id,1,10) id,substr(action,1,10) action,substr(version,1,8) version,substr(BUNDLE_SERIES,1,6) bundle,substr(comments,1,20) comments from registry$history; 
spool off 

Thanks 
Girish