[Bug 1944711] Update Released

[Brian Murray]

The verification of the Stable Release Update for systemd has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1944711

Title:
  restarting systemd-logind loses all existing sessions

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Fix Released

Bug description:
  [impact]

  restarting the systemd-logind service loses all existing sessions

  [test case]

  ubuntu at test-f:~$ loginctl list-sessions
  SESSION  UID USER   SEAT TTY
     3789 1000 ubuntu      pts/0

  1 sessions listed.
  ubuntu at test-f:~$ journalctl -b -u systemd-logind
  -- Logs begin at Thu 2021-09-23 11:11:57 UTC, end at Thu 2021-09-23 11:22:55 UTC. --
  Sep 23 11:22:51 test-f systemd[1]: Starting Login Service...
  Sep 23 11:22:51 test-f systemd-logind[198]: New seat seat0.
  Sep 23 11:22:51 test-f systemd[1]: Started Login Service.
  Sep 23 11:22:52 test-f systemd-logind[198]: New session 3789 of user ubuntu.
  ubuntu at test-f:~$ sudo systemctl restart systemd-logind
  ubuntu at test-f:~$ journalctl -b -u systemd-logind
  -- Logs begin at Thu 2021-09-23 11:11:57 UTC, end at Thu 2021-09-23 11:23:07 UTC. --
  Sep 23 11:22:51 test-f systemd[1]: Starting Login Service...
  Sep 23 11:22:51 test-f systemd-logind[198]: New seat seat0.
  Sep 23 11:22:51 test-f systemd[1]: Started Login Service.
  Sep 23 11:22:52 test-f systemd-logind[198]: New session 3789 of user ubuntu.
  Sep 23 11:23:07 test-f systemd[1]: Stopping Login Service...
  Sep 23 11:23:07 test-f systemd[1]: systemd-logind.service: Succeeded.
  Sep 23 11:23:07 test-f systemd[1]: Stopped Login Service.
  Sep 23 11:23:07 test-f systemd[1]: Starting Login Service...
  Sep 23 11:23:07 test-f systemd-logind[469]: Failed to add user by file name 1000, ignoring: Invalid argument
  Sep 23 11:23:07 test-f systemd-logind[469]: User enumeration failed: Invalid argument
  Sep 23 11:23:07 test-f systemd-logind[469]: User of session 3789 not known.
  Sep 23 11:23:07 test-f systemd-logind[469]: Session enumeration failed: No such file or directory
  Sep 23 11:23:07 test-f systemd-logind[469]: New seat seat0.
  Sep 23 11:23:07 test-f systemd[1]: Started Login Service.
  ubuntu at test-f:~$ loginctl list-sessions
  No sessions.

  [regression potential]

  any regression would likely occur during a systemd-logind restart,
  likely causing a loss of current login sessions.

  [scope]

  this is needed only in f

  this is fixed upstream by commit
  ac4e03d45bcf4ad2e570cabdb218e9bac003cc80 which is included in v246, so
  this is fixed in h and later already.

  in b, the function used to parse the /run/systemd/users/* files allows
  either usernames or uids, so this bug does not exist there

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