(originally from https://web.archive.org/web/20150422203246/http://ajcsystems.com/blog/page/2/)
I recently had to fix a server which had been knocked off the network due to some bad configuration (very long story). When I logged into the remote graphical console, I was greeted with constant, unremitting spam from the kernel log! I wasn’t able to log in because the screen would clear instantly when I started typing.
This calls for the Magic SysRq key! A simple press of Alt+SysRq+0 to set the console log level to 0 silenced all of the log spam and let me log in and get the server back on its feet.
All hail Magic SysRq!
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