On the FreeBSD questions list a user posted that his ntpd crashed when
the following servers were used
server ntp-1.ece.cmu.edu
server ntp-2.ece.cmu.edu
server fuzz.psc.edu
I can reproduce this on my servers by adding those three lines to the
end of the config (4.2.0 release and ntp-dev-4.2.0a-20050303 both on
FreeBSD) - I'm going to dig into it a little more and see if I can
figure out why but if anybody has any ideas I'd love to know.