Search notes:

SysRq

The «magic» SysRq key

The magical SysRq key is a key-combination that can be pressed when the kernel seems to be unresponsive.
It is enabled with the CONFIG_MAGIC_SYSRQ kernel configuration.

See also

/proc/sys/kernel/sysrq, /proc/sysrq-trigger, drivers/tty/sysrq.c, Documentation/sysrq.txt
The SysRq key was added with on the PC/AT keyboard.

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