ORA-04021: timeout occurred while waiting to lock object error while executing catbundle.sql script

ORA-04021: timeout occurred while waiting to lock object error while executing the catbundle.sql script

During the patching process, we need to apply the patch sqls to the database. To apply the patches to the database, we execute

cd $ORACLE_HOME/rdbms/admin
sqlplus / as sysdba
@catbundle.sql apply PSU

the above script hangs due to locked object and the error is written to the log ORA-04021: timeout occurred while waiting to lock object

This was due to the locked object dbms_advisor (in my case).

Solution:
Restarting the database cleared the locks and the catbundle apply completed in few minutes.