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Easy!
You need to execute this as root.
First enable SysRq feature in the kernel
echo “1” > /proc/sys/kernel/sysrq
Then crash the kernel (makes a kernel dump)
echo c > /proc/sysrq-trigger
Reboot with no conditions (no disk unmount, just like pressing reset button)
echo b > /proc/sysrq-trigger
Shutdown all the processes gracefully except init
echo e > /proc/sysrq-trigger
Kill all the process brutally except init
echo i > /proc/sysrq-trigger