System freeze (KDE? kernel?)

view story

https://bbs.archlinux.org – Wikipedia on Magic Sysrq wrote:Some people view this key as giving access to dangerous system-level commands to anyone who has physical access to the keyboard or serial console.[8] It has been argued that this perceived security is illusory, as anyone with physical access to the computer would already have the capability to compromise its security.[9] The advent of the procfs interface has rekindled debate over this subject.I agree with this that anyone who has physical access to the machine is a potential security risk.  In your case, I think that giving the ability to reboot the machine (HowTos)