Crash

[Leo Galambos <galambos_(_at_)_com-os2_(_dot_)_ms_(_dot_)_mff_(_dot_)_cuni_(_dot_)_cz>]

Hi gurus.

My box is an i386 (configured for 64 maxusers and with disabled drivers,
that I don't need). It works as a mail HUB/gtw. It also runs apache (it
just lives, but doesn't serve under heavy load yet), mysql and X11. Other
packages wouldn't affect system performance/stability IMHO.

On Sunday, my collegue has started XFree and Netscape. The nutscape
couldn't connect to a server, that is on the same cable/segment. Then it
went down. Noone has used the box in that moment (except the collegue).

The box restarted with:
Jun  6 11:32:15 backbone /bsd: WARNING: / was not properly unmounted

My question is pretty simple. How can I investigate this accident? What
should I look at? (if you need more info, please tell me, what you like to
see, I will post it here)

What happens, when kernel hangs? Will it restart machine, or it jumps to a
debug prompt?

---
What netscape says everytime:
Jun  7 09:20:43 backbone netscape: /etc/pwd.db: Invalid argument
Jun  7 09:20:43 backbone last message repeated 3 times
---

Thanks.

Leo