The "magic SysRq key" provides a way to send commands directly to the kernel through the /proc filesystem.
It is enabled via a kernel compile time option, CONFIG_MAGIC_SYSRQ,
which seems to be standard on most distributions.
First you must activate the magic SysRq option:
echo 1 > /proc/sys/kernel/sysrq
When you are ready to reboot the machine simply
run the following:echo b > /proc/sysrq-trigger
