patched files, recompiled kernel with :

makeoptions	DEBUG="-g"

in kernel file, dhclient call locks box up tight,
copied by hand:
Panic : machine check
Stopped in pid 277.1 (ifconfig) at netbsd: cpu_debugger +0x4
unexpected machine check:
mces   = 0x1
vector = 0x660
param = 0xfffffc0000006060
pc  =       0xfffffc0000734990
ra  =        0xfffffc00006d060c
curlwp = 0xfffffc00001c0717
Pid = 277.1, comm = ifconfig
db> t
cpu_debugger() at netbsd : cpu_debugger +0x4
machine_check()
Prolog botch : displacemt 64
frame size botch : adjust register offsets?

--repeats for displacement 16,32,64
-Mel