Sun4/110 "Panic: Crazy Interrupts"

Hi all!

This is partially a follow-up to my previous set of emails about
diskless NFS issues on NetBSD port-sparc - those issues were caused by
some network misconfiguration on my end.

Now that the network issue is resolved, I'm running into a consistent
kernel panic that happens when booting on my Sun4/110 workstation. I'm
using a kernel built from the config in this Gist:
https://gist.github.com/sfurtaw/28a600a282d0af955dc7275e2648c4e6

I've taken a video of what happens here:
https://www.youtube.com/watch?v=Y6W9c9ul9KY

Basically, the panic always shows up at this same point in the boot
process, whether I load diskless over NFS or with my SCSI hard drive
emulator. After it loads up the sparcvme device, it throws maybe 10
stray interrupts before the panic.

I would love to get some help if anyone is interested - I can't bring
much to the table myself in terms of OS development, but I can
definitely do my best to help debug. My backup option is to try and
load up another, older NetBSD release - I'd love to get a modern OS
stack onto this thing to demo at VCF East or something similar. It's a
great relic!

Thanks!
Samuel