This is the 2nd (or 3rd) time CURRENT has crashed in the same place on
startup (multiuser).

Machine Q650 with 32MB
Drive Quantum 230MB formatted as 210MB Root&User 20MBSwap. No MacOS partition.
NetBSD 1.3H (GENERIC #87).

Boot messages
network initialisation immediatly followed by ...
uvm_fault(0x153204, 0xffff0000, 0, 0x3) -> 0x1
	type 8, code [mmu,,ssw]:485
Trap type 8, code = 0x485, v = 0xffff0004
kernel program counter = 0xf7e2c
kernel: mmu fault trap
pid = 42, pc = 000F7E2C, ps = 2200, sfc = 1, dfc = 1

Registers ...

Kernel stack ...

panic: MMU fault
stopped in sh at _Debugger+0x6: unlk ab

a reboot generates an automatic fsck and clean boot.