1 kernel.sysrq is defined in /etc/sysctl.conf owned by rc-scripts.
2 having it here as well, will print notice:
4 # /lib/systemd/systemd-sysctl
5 Overwriting earlier assignment of kernel/sysrq in file '/etc/sysctl.d/99-sysctl.conf'.
7 --- systemd-221/sysctl.d/50-default.conf~ 2015-02-28 18:38:38.000000000 +0200
8 +++ systemd-221/sysctl.d/50-default.conf 2015-08-01 22:43:16.307974188 +0300
10 # (e.g. /etc/sysctl.d/90-override.conf), and put any assignments
13 -# System Request functionality of the kernel (SYNC)
15 -# Use kernel.sysrq = 1 to allow all keys.
16 -# See http://fedoraproject.org/wiki/QA/Sysrq for a list of values and keys.
19 # Append the PID to the core filename
20 kernel.core_uses_pid = 1