SysRq
With the right options enabled in the kernel, you can use some kernel hacking keystrokes to handle the machine.
Here we go:
Key Sequence Description
Alt+SysRq+R use Raw keyboard events
Alt+SysRq+K kill current VT in use
Alt+SysRq+E tErminate all running processes (exceptinit)
Alt+SysRq+I kIll all processes (except init)
Alt+SysRq+L kilL all processes (including init)
Alt+SysRq+B reBoot
Alt+SysRq+S Sync all drives
Alt+SysRq+U Umount all filesystems
Alt+SysRq+O turn the machine Off
Alt+SysRq+P dump Processor's registers
Alt+SysRq+T dump current Tasks
Alt+SysRq+M dump some Memory info
Alt+SysRq+[0-9] set kernel log level and redirect it to console
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CopyLeft (l) 2003 by Raffael Marty
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