Reboot machine when everything is hanging

<alt> + <print screen/sys rq> + <R> – <S> – <E> – <I> – <U> – <B>

If the machine is hanging and the only help would be the power button, this key-combination will help to reboot your machine (more or less) gracefully.

R – gives back control of the keyboard

S – issues a sync

E – sends all processes but init the term singal

I – sends all processes but init the kill signal

U – mounts all filesystem ro to prevent a fsck at reboot

B – reboots the system

Save your file before trying this out, this will reboot your machine without warning!

http://en.wikipedia.org/wiki/Magic_SysRq_key

 

Note: Your kernel needs CONFIG_MAGIC_SYSRQ=y

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