Kernel Trap during installworld caused unrecoverable system

[Glen Barber]

Hi folks.

I was unfortunate enough to encounter a kernel trap in single user
mode yesterday when upgrading from 7.1-RC1 to -RC2 using the typical
build/install world.

I'm still not sure what caused the trap, as the system was rebooting
when I saw the screen.  As one would expect, this led to an
irrecoverable system; the system would automatically drop me into
single user mode, as it could only mount the root directory; /bin/sh
and /bin/csh would not work (had to use /restore/csh for the minimal
digging I actually could do).

So, now to the question.  Given I could not mount anything other than
/, would there have been any way for me to gather debugging
information on what caused this failure?  (FWIW, I am certain it is
not a hardware failure.)

Regards,

-- 
Glen Barber