ora 7445 coredump

I have encountered ora 7445 coredump error in my alert log.
WHat could be the cause for this? I have already called Customer support and waiting for response. I am not able to connect to the database in any manner.

What would be the way to recover?

very urgent, please help..

Thanx in advance.

This looks like a bug. What os and oracle version are you running ?
Did it generate any trc file ? If so have a look and what caused this core dump.
As for the connection, did u check if the DB is up ?