What is the SysRq Facility and how do I use it?

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The SysRq facility is one of the best (and sometimes the only) way to determine what a machine is really doing. When triggered, SysRq will send a signal requesting some diagnostic information to the operating system kernel. This is most useful when a system appears to be "hung", and for diagnosing elusive, transient, kernel-related problems.

What is the "Magic" SysRq key?

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