I have a SS4 here on which I have been running NetBSD 1.2B since
half a year, without any problem. Now I just started upgrading to 
-current, but the kernel is _very_ unstable. As soon as I am doing
some heavy disk activity the machine dies! No crash, nothing, it 
just turns off the screen and restarts itself, and when it comes
up the "just heavily loaded" filesystem is very trashed. It feels
like the SCSI subsystem is doing something real nasty and therefore
writes over some important data. This only shows when doing something
like 'make build -j 4' or 'rm -rf /usr/src'. Because there are no
normal crash I have no idea about where to search for the trouble...

-- Ragge

PS. 1.2B can be forced to panic when doing heavy network/scsi 
load simultaneously; don't know if it's related...