And re halt/poweroff/reboot: We tried to figure it out for some systems, where a user session was blocking reboot, but eventually stopped investing resources in

And re halt/poweroff/reboot: We tried to figure it out for some systems, where a user session was blocking reboot, but eventually stopped investing resources into it. Similar to the booting problem, we expect a computer to "just reboot" and the default behaviour should be that kill -9 is issued after some timeout.