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Using Magic SysRq
Allows to run multiple debug / rescue commands even when the kernel seems to be in deep trouble
- On PC: Alt + SysRq + <character>
- On embedded: break character on the serial line + <character>
. Example commands:
- n: makes RT processes nice-able.
- t: shows the kernel stack of all sleeping processes
- w: shows the kernel stack of all running processes
- b: reboot the system
- You can even register your own!