I've had the machine die twice in the last week with a VM fault, followed
by mc0: receive FIFO overflow, so I guess I should pay attention.  The
kernel this happened with is at
ftp://macbsd.jpl.nasa.gov/pub/users/hotz/netbsd.hotz4 together with the
applied patches and the config file if anyone is that ambitious.

The partial stack trace (copied by hand) is:
_Debugger
_panic
_trap
faultstkadj(4aac00,549100,33def884,4aac00,7f2c9c) + 0
_mcstart(4aac28,33def801,4aac00,7f2b94,c9374) + 5e
_mc_tint(4aac00) + aa
_mcintr(4aac00,7f2c18,34b4,7f2bac,2404) + 58
_psc_lev3_intr(7f2bac) + 36
_lev3intr(?)
_aarpresolve(4aac28,544a80,7f2c9c,7f2c62) + 14
_ether_output(4aac28,544a80,7f2c9c,0,532080) + 22a
_ddp_route
_ddp_input
_atintr
_netintr
_trap
rei(?)
_mi_switch
_tslup
_sys_select
_syscall
_trap0

Signature failed Preliminary Design Review.
Feasibility of a new signature is currently being evaluated.
h.b.hotz@jpl.nasa.gov, or hbhotz@oxy.edu