NetBSD 2.0_BETA Issue

I've been experiencing some random reboots while compiling things on the 
generic kernel from the releng server (NetBSD nightmare.unios.ca 2.0_BETA 
NetBSD 2.0_BETA (GENERIC) #0: Thu Apr  1 10:48:15 UTC 2004).

I figured it might be NFS I/O related, so I tried a few:  dd if=/dev/urandom 
of=randomcrap bs=8k count=1000 to see if I could get it to trigger.  This 
won't crash the box, however it does cause the box to go mostly unresponsive 
for the duration of the dd runtime.  The higher the block size, the more 
pronounced the unresponsiveness.  I can't even break into the debugger on the 
local console until the process completes.

Is this netbsd wide, or just Dreamcast related?

BTW:  The compile that seems to trigger the random reboots 
is /usr/pkgsrc/misc/screen.  I'm sure others will work, but that's just the 
one I'm working with right now.  If it helps, I'm using the lan adaptor not 
the bba and booting the kernel with a CD with a NFS mounted swap (24 meg) and 
root.

- Pat