magicKeys

Alt+SysRq+b   immediate reboot
Alt+SysRq+o   power off
Alt+SysRq+s   sync filesystems
Alt+SysRq+u   remount filesystems read-only
Alt+SysRq+i   kill all tasks except init
Alt+SysRq+f   invoke OOM killer
Alt+SysRq+t   dump task list
Alt+SysRq+w   dump blocked tasks
Alt+SysRq+m   dump memory info
Alt+SysRq+l   dump CPU backtraces
Alt+SysRq+h   help / list available commands