I have an Ultra 10 running -current (GENERIC) that wedges after running
for some time, or under load.  There are no kernel messages at all when
this happens.

I've also tried a trimmed down custom kernel with LOCKDEBUG and DIAGNOSTIC
and I see the same behavior.

I'm using the normal console, could this be related?  Should I use a serial
console?

I would like to have this machine stable, but I haven't had much luck so
far.  Anyone have any suggestions on stable kernels?
Thanks.

-Andrew