Install of NetBSD on 3000/300 Fails Repeatably

All,

I've been attempting to install NetBSD 9.2 onto my 3000/300, and I get a
repeatable machine check, during the unpacking of base.tgz:

     Status: Running    Command: progress -zf
//cd//alpha/binary/sets/base.tgz tar --chroot -xpf -

────────────────────────────────────────────────────────────────────────────────

 10% |***                                | 14704 KiB  699.64 KiB/s    03:03
ETAmachine check
[ 193.6236574] cpu0: Begin traceback...
[ 193.6236574] alpha trace requires known PC =eject=
[ 193.6236574] cpu0: End traceback...
Stopped in pid 43.1 (gzip) at   fffffc0000a51304:       ret     zero,(ra)
db>

I've checked my ram with the builtin checkout utility, and there doesn't
seem to be anything else obvious. Does this look like bad cache on the CPU
module?

Thanks!
- Alex