systemd-logind: Failed to start session scope session-2.scope: Connection timed out

From	Vincent Lefevre <vincent@vinc17.net>
Newsgroups	linux.debian.user
Subject	systemd-logind: Failed to start session scope session-2.scope: Connection timed out
Date	2022-02-09 15:40 +0100
Message-ID	<DOWit-DGp-17@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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After rebooting with the latest kernel under Debian/unstable
(5.16.0-1-amd64) and logging in via lightdm, the machine got frozen.
I managed to get my desktop by switching to a text console
(Ctrl-Alt-F1), then back to VT7 (where Xorg is running).

In the journalctl logs:

[...]
Feb 09 13:56:28 cventin systemd[1]: Stopping Session c1 of User lightdm...
Feb 09 13:56:28 cventin lightdm[966]: pam_unix(lightdm-greeter:session): session closed for user lightdm
Feb 09 13:56:28 cventin systemd[1]: session-c1.scope: Deactivated successfully.
Feb 09 13:56:28 cventin systemd[1]: Stopped Session c1 of User lightdm.
Feb 09 13:56:28 cventin systemd[1]: session-c1.scope: Consumed 1.728s CPU time.
Feb 09 13:56:28 cventin systemd-logind[714]: Removed session c1.
Feb 09 13:56:28 cventin lightdm[1071]: pam_unix(lightdm:session): session opened for user vlefevre(uid=1000) by (uid=0)
Feb 09 13:56:28 cventin systemd[1]: Created slice User Slice of UID 1000.
Feb 09 13:56:28 cventin systemd[1]: Starting User Runtime Directory /run/user/1000...
Feb 09 13:56:28 cventin pulseaudio[987]: Error opening PCM device hdmi:1,1: No such file or directory
Feb 09 13:56:38 cventin systemd-timesyncd[479]: Initial synchronization to time server 62.210.244.146:123 (2.debian.pool.ntp.org).
Feb 09 13:56:52 cventin systemd-logind[714]: Failed to start session scope session-2.scope: Connection timed out
Feb 09 13:56:52 cventin systemd[1]: NetworkManager-dispatcher.service: Deactivated successfully.
Feb 09 13:56:52 cventin lightdm[1071]: pam_systemd(lightdm:session): Failed to create session: Connection timed out
[...]

Note: the "Error opening PCM device hdmi:1,1: No such file or directory"
message is usual. So this is not the cause of the issue.

And I can see a bit later:

Feb 09 13:56:53 cventin kernel: traps: light-locker[1582] trap int3 ip:7ff8c2dedddf sp:7ffe165ef8f0 error:0 in libglib-2.0.so.0.7000.3[7ff8c2db0000+8b000]

This was the first time I got such a trap, but I don't know whether it
is related, and if it is, whether this is a cause or a consequence.

I tried again by rebooting a few times, but couldn't reproduce the
problem.

Any idea of the cause? A bug somewhere?

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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systemd-logind: Failed to start session scope session-2.scope:  Connection timed out Vincent Lefevre <vincent@vinc17.net> - 2022-02-09 15:40 +0100

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