Hmm, just built a new -current kernel, and under it was 
rebuilding the bootblocks, when I hit a trap in 
pmap_enter_ptpage.  It looked like a dereference of a null
pointer.  Unfortunately, I had NFS filesystems mounted,
so I had to hard-reset to get it to reboot.

Useful numbers :

fault address 0xc
fault pc      pmap_enter_ptpage+0x776

(should I be filing this as a PR? port-m68k?)

--
Mike Smith  *BSD hack  Unix hardware collector
The question "why are the fundamental laws of nature mathematical"
invites the trivial response "because we define as fundamental those
laws which are mathematical".  Paul Davies, _The_Mind_of_God_