Search notes:

/proc/sysrq-trigger

As per a comment in drivers/tty/sysrq.c: Writing C to /proc/sysrq-trigger is like *sysrq-C`.
As per a comment in Documentation/arch/x86/earlyprintk.rst, a harmless kernel message can be provoked by wrting h into /sys/sysrq-trigger.

See also

SysRq

Index

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