[systemd-devel] How to find out the processes systemd-shutdown is waiting for?

[Arian van Putten]

I've seen this a lot with docker/containerd. It seems as if for some reason
systemd doesn't wait for their  cgroups to cleaned up on shutdown. It's
very easy to reproduce. Start a docker container and then power off the
machine. Since the move to cgroups V2 containerd should be using systemd to
manage the cgroup tree so a bit puzzling why it's always happening.

Something seems to be off with containerd's integration into systemd but
I'm not sure what.





On Wed, 2 Mar 2022, 12:30 Manuel Wagesreither, <ManWag at fastmail.fm> wrote:

> Hi all,
>
> My embedded system is shutting down rather slow, and I'd like to find out
> the responsible processes.
>
> [ 7668.571133] systemd-shutdown[1]: Waiting for process: dockerd, python3
> [ 7674.670684] systemd-shutdown[1]: Sending SIGKILL to remaining
> processes...
>
> Is there a way for systemd-shutdown to give me the PID of the processes it
> waits for?
>
> There are quite a few docker and python3 services running on my system and
> the lines printed above doesn't help much.
>
> I'm using systemd 244 (244.5+).
>
> Thanks,
> Manuel
>
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