> Why sysrq is limited to only "sync" command on official
fedora kernel?
The kernel itself isn't limited. It's just set that way in
/usr/lib/sysctl.d/50-default.conf which is provided by systemd. You
can edit that file, create your own in /etc/sysctrl.d/, or (as root)
set it to whatever you would like via /proc/sys/kernel/sysrq.
Of course it can be changed at runtime, but I mean why official fedora
kernel shouldn't be configured to allow all (or at least a wider
subset) of sysrq commands by default?
This way official fedora live CDs are unsuitable for system recovery
tasks; you have to change sysrq value every time you use live CDs or
build your own live CD.
Regards,
Ali