Out of Shared Memory: max_locks_per_transaction

I have a PGSQL 9.0.1 database which is on the back-end of an app I was
stress testing last night. This morning, when I try to run psql, I get:

psql: FATAL: out of shared memory
HINT: You might need to increase max_locks_per_transaction.

I believe something in the app is failing to release resources -- maybe a
3-way or 4-way deadlock between writing to tables inside the triggers in
PGSQL or a deadlock between multiple processes talking to the app and the
database or something leaking in the app itself which is causing locks to
not be freed.

How do I track down what is going on if I cannot even run psql to get into
the DB to run troubleshooting queries?

Thanks in advance for any suggestions.

--
Eliot Gable

"We do not inherit the Earth from our ancestors: we borrow it from our
children." ~David Brower

"I decided the words were too conservative for me. We're not borrowing from
our children, we're stealing from them--and it's not even considered to be
a crime." ~David Brower

"Esse oportet ut vivas, non vivere ut edas." (Thou shouldst eat to live;
not live to eat.) ~Marcus Tullius Cicero