I just clued in: this is the ARP changes. 
  Woe, if_ether.c is no longer in netinet! How long has that been
misplaced... 12 years or so?

]   Temporarily located in balmy Helsinki, Finland, at SSH      | one quark   [
]  Michael Richardson, Sandelman Software Works, Ottawa, ON     | two quark   [
] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ | red q blue q[
] panic("Just another NetBSD/notebook using, kernel hacking, security guy");  [