http://portal.itauth.com/2007/10/29/linux-howto-emergency-reboot-remote-machine
The first step is to enable the SysRq system, if it's disabled:
echo 1 > /proc/sys/kernel/sysrq
Now you can reboot (instantly, be forewarned) if the machine is hung:
echo b > /proc/sysrq-trigger
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