Debugging via DDB

[David N]

Hi,

I know this might sound like a newbie question.

I'm trying to debug a "Lockup" on 7.2-RELEASE. I've compiled DDB and
KDB into the kernel and make installkernel. (Can this be called a
deadlock?)

The machine still response to pings, but it looks like all disk
activity has stopped.

I can break into the debugger using CTRL-ALT-ESC, but after that, i
dont know what I'm looking for in particular.

bt (backtrace) gives me the stuff like the keyboard mutex ( i assume
it was the last thing that happened, but obviously it was the break)

Should I be including WITNESS?

Regards
David N