DragonFlyBSD

I installed 3.8.2 from a CD on a server the day before yesterday, the default /etc/rc.conf that came with it, modified initially by me only for the networking setup, had usbd_enable="yes" in it. When I tried to reboot, after stopping sshd but before getting to devd, it just stopped. I came back in person the next morning and just hit ctrl-alt-delete, and it resumed the reboot process and booted up normally. I changed the usbd_enable="yes" to no, and that fixed the problem.

i don't know if this affects all hardware or just the supermicro I ran this on, but unless you have physical/ipmi access to a system, this would make reboots impossible remotely.