Please run /usr/bin/reboot under gdb, and send a call stack when it crashes.  To
do this, from a shell prompt:
	gdb /usr/bin/reboot
(gdb will start, and present its prompt)
	set args --disable-crash-dialog
	run
(it should segfault)
	where
	quit
(back in your shell)

You can capture the output by starting up /usr/bin/script and running these
commands from inside of the shell it starts, and then typing "exit" to exit the
shell.  Script will log all of the text that was printed to your screen in a
file named "scriptfile", which should help us track this down.

Thanks!