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The "magic sysrq" key sequence is a feature of the Linux kernel that, when enabled, provides debugging and disaster recovery features on the system console and serial console.

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The documentation for sysrq is in the linux source code (https://github.com/torvalds/linux/blob/master/Documentation/sysrq.txt). I very highly recommend that you read it. Is SysRq key enabled? Firs …
answered Feb 18 '14 by dnozay