[Bug 1944711] Re: restarting systemd-logind loses all existing sessions

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 245.4-4ubuntu3.14

---------------
systemd (245.4-4ubuntu3.14) focal; urgency=medium

  [ Lukas Märdian ]
  * Allow target units to fail (LP: #1948476)
    File: d/p/lp1948476-pid1-target-units-can-fail-through-dependencies.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=fe0cb0bd66baea89d8bbe47cb47d88540f46d470
  * Fix whitespace in lp1926547-hwdb-60-keyboard-Update-Dell-Privacy-Micmute-Hotkey-.patch to match upstream
    File: debian/patches/lp1926547-hwdb-60-keyboard-Update-Dell-Privacy-Micmute-Hotkey-.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=80fef80a1b018556939011707c4ce00cebc58806
  * Support detection for ARM64 Hyper-V guests (LP: #1952599)
    Files:
    - debian/patches/lp1952599/0001-virt-Support-detection-for-ARM64-Hyper-V-guests.patch
    - debian/patches/lp1952599/0002-virt-Fix-the-detection-for-Hyper-V-VMs.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=caf3aff933cc7bf21565faba05f78ce78b3196cd

  [ Andy Chi ]
  * Add privacy micmute hotkey for Dell machine. (LP: #1952733)
    File: debian/patches/lp1952733-hwdb-60-keyboard-Update-Dell-Privacy-Micmute-Hotkey-Map.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=ff8dc41f55baa418076e42509ddbf3212a8c1353
  * Add microphone mute key for Dell machine. (LP: #1952735)
    File: debian/patches/lp1952735-keymap-Add-microphone-mute-keymap-for-Dell-Machine.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=175fb4e209fba889b4bcd81cb2ed262923943a3f

  [ Yao Wei ]
  * Add ACCEL_LOCATION=base property for 6 Dell clamshell models (LP: #1943561)
    File: debian/patches/lp1943561-dell-clamshell-accel-location-base-with-sku.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=246195d68b2bb0473f4a3f1c2ebe54dfd37f068b

  [ Dan Streetman ]
  * d/p/lp1944711-login-filenames-in-run-systemd-users-are-uids.patch:
    Fix systemd-logind restart loading of existing sessions
    (LP: #1944711)

  [ Ratchanan Srirattanamet ]
  * d/p/debian/timedatectl-lp1650688.patch,
    d/p/debian/UBUNTU-Fix-timezone-setting-on-read-only-etc.patch:
    Fix timedated unable to retrieve & properly set timezone on
    read-only /etc (e.g. Ubuntu Core and system-image-based systems)
    (LP: #1650688)

 -- Lukas Märdian <slyon at ubuntu.com>  Fri, 10 Dec 2021 10:04:02 +0100

** Changed in: systemd (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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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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