Patch: 5531010 : ORA-01041: internal error. hostdef extension doesn't exist ; memory exhausted ORA-2

Hi,
While applying patch#5531010 getting the following error:

ERROR:
ORA-01041: internal error. hostdef extension doesn't exist


memory exhausted
ORA-24323: value not allowed
Error accessing package DBMS_APPLICATION_INFO
ERROR:
ORA-03114: not connected to ORACLE


memory exhausted
memory exhausted


Time when worker failed: Sat Sep 15 2012 00:55:50

AD Worker error:
The following ORACLE error:

ORA-03114: not connected to ORACLE


occurred while executing the SQL statement:

UPDATE fnd_install_processes
SET status = 'F'
WHERE worker_id = 8

Error comitting pending transactions and closing Pro*C connection.

The error is:

FND-UT-CMT: ORA-01041: internal error. hostdef extension doesn't exist

AD Worker is exiting with failure.
. hostdef extension doesn't exist