> ...which of the N panics is this?

That might help eh?  :)
Ok, here is a slightly better report...
Booting a GENERIC kernel built yesterday, with *no* actual network
hardware found. (this is on my laptop)  I fsck/mount, and run:
# dhclient
Can't attach interface eon0 to bpf device /dev/bpf0: Device not configured
exiting.
# dhcleint
vm_fault(0xf837a000, f8772000, 1, 0) -> 1
kernel: page fault trap, code=0
Stopped at	_free+0x2f:	movxwl	0(%eax), %eax
db> trace
_free(deadbeef,5,f8809780,fac3bda4,f8170cb8) at _free+0x2f
_rtfree(f8809780) at _rtfree+0x88
_in_ifscrub(f829f1f4,f8809000) at _in_ifscrub+0x26
_in_control(f880e100,80206919,fac3bec0,f829f1f4,f880bc00) at _in_control+0x57a
_udp_usrreq(f880e100,b,80206919,fac3bec0,f829f1f4) at _udp_usrreq+0x28
_ifioctl(f880e100,80206919,fac3bec0,f880bc00,0) at _ifioctl+0x2ff
_soo_ioctl(f880c700,80206919,fac3bec0,f880bc00,f8289e7c) at _soo_ioctl+0xdc
_sys_ioctl(f880bc00,fac3bf88,fac3bf80,0,0) at _sys_ioctl+0x2c7
_syscall() at _syscall+0x248
--- syscall (number 54) ---
0x1eddf:
db>

I can mail the output of 'nm -n' also, but it is about 200k, and I
didn't want to blast the list with it.  Also, ifconfig -l shows:
lo0 sl0 sl1 ppp0 ppp1 tun0 tun1 eon0

-Andrew