when debian run out of memory

["hhding.gnu" <hhding.gnu@gmail.com>]

Hi list,

When debian run out of memory, I can only ping the host and can't ssh to 
the host.
It seems oom-killer is running but memory is still exhaust.

What should I do then? Only reboot can solve the problem?
Can I protect oom-killer from kill the sshd then I can ssh to the box to 
kill the process?

Ding Honghui