immediate v6-related crash

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

On an up-to-date -current kernel (i386, Dell Dimension 8400 with bge
card), I get a reproducible panic shortly after going multi-user:
"in6_cksum: mbuf too short for IPv6 header".  It then reboots
immediately, not even dumping core.  (I have ddb.onpanic=0.)  I'm not
certain exactly where this is happening, since the reboot happens
before I can read the screen, but it's some time after ntpd starts.


                --Steve Bellovin, http://www.cs.columbia.edu/~smb