Bug#918764: udev: "udevadm control --reload-rules" kills all processes except init

[Gedalya]

On Wed, 30 Jan 2019 01:37:14 +0100 Axel Beckert <abe at debian.org> wrote:

> > Moving udev into its own special cgroup didn't change anything: udev
> > is still running, same PID, and and the same goes for ntpd.
> > Everything else is killed.
>
> And here you gave me the right hint: cgroups!
>

OK, Lorenz discovered this first :-), cgroups are used by systemd to implement the concepts of user session or slice.