It is known that one can reboot a linux machine with Alt-SysRq-b if this is enabled.see for example, https://major.io/2009/01/29/linux-emergency-reboot-or-shutdown-with-magic-commands/From what I saw, if sysctl -a | grep kernel.sysrq = shows kernel.sysrq = 176this means that this option is enabled, but the value 176 is comprised from other bits as well.Is there any way that I can check if rebooting with Alt-SysRq-b is enabled on a given machine ? 
Enabling rebooting with Alt-SysRq-b and sysctl -a
reboot;magic sysrq