On Sun, Dec 26, 2021 at 3:03 PM beroal <me@xxxxxxxxxxxx> wrote:
Hi. I have an autologin program which authenticates a user without asking for a password and starts a child process executing a user shell (for example, Bash, Xorg, or a Wayland compositor).
This program is a systemd service. I discovered that systemd kills the autologin program, but does not kill the child of the autologin program. As I understand from the systemd documentation, systemd should kill both.
Systemd doesn't kill child processes when stopping a service – it only kills processes found in the service's cgroup. As pam_systemd has intentionally moved your processes to a separate per-session .slice cgroup, they're no longer tied to the original .service's lifetime.
(I'm not very familiar with Wayland's requirements, but does your autologin program do anything specific that the built-in [Service] PAMName= wouldn't do anyway?)
Mantas Mikulėnas
