ORA - 600 error while granting privs

Question

Whenever I fire the below query it returns me a ORA-600 error.
Query
select grantee UserName, granted_role Role from dba_role_privs
where grantee in (select grantee from dba_role_privs
where granted_role = 'DBA')
and grantee in (select username from dba_users
where (username not like '%SYS%' and username not in('BWUSER','ORADMIN')))
order by grantee, granted_role;
ERROR
and grantee in (select username from dba_users
ERROR at line 4:
ORA-00600: internal error code, arguments: [qernsRowP], [1], [], [], [], [],
Please help in optimisizng the query
Jafar

Answer 1

I am using sqlplus to connect to oracle.
Oh! Query works fine for me after slight adjustment but i dont how?
I made a sligth adjustment
Old query
select grantee UserName, granted_role Role from dba_role_privs
where grantee in (select grantee from dba_role_privs
where granted_role = 'DBA')
and grantee in (select username from dba_users
where (username not like '%SYS%' and username not in('BWUSER','ORADMIN')))
order by grantee, granted_role;
New Query
select grantee UserName, granted_role Role from dba_role_privs
where grantee in (select grantee from dba_role_privs
where granted_role = 'DBA'
and grantee in (select username from dba_users
where (username not like '%SYS%' and username not in('BWUSER','ORADMIN')))
order by grantee, granted_role;
Please look at the bold words, and anyone tell me what was the major difference between the two query for succesful execution.
Thanks'
Jafar