> Snap?
> 
> I just hit something similar (current kernel built sunday, wored other times.  Apart from noticing that ifconfig was mentioned, I wasn't in a position to investigate further.  I am using a sadly out-of-date userland (couldn't get 1.5 branch to build.
> 
> (Speaking of which, is there a kdb for gdb bigots page somewhere?)
> 
> Mine looks like:
> 
> Trap type 700 at 0
> Stopped in PID 69 (ifconfig) @0x2002b0: mtspr r0, lr
> 
> Ifconfig is from 1.5.2.

Just FYI, re-updating to yesterdays mainline kernel made the problem go 
away.  I guess something was fixed.

thanks,
Andrew