In the original report, the issue happened randomly on boot when a service[1] was triggering a reload while systemd-logind was starting, resulting in a list of queued jobs that were never executed.
The issue can happen too under high load conditions, as reported upstream: https://github.com/systemd/systemd/issues/12956 To simplify the reproducer I went with systemd-logind+daemon-reload, but it can be done with any other dbus service. [1] [Unit] Description=Disable unattended upgrades After=network-online.target local-fs.target [Service] Type=oneshot ExecStart=/bin/bash -c "/bin/chmod 644 /etc/cron.daily/apt-compat ; /bin/systemctl disable apt-daily-upgrade.timer apt-daily.timer ; /bin/systemctl stop apt-daily-upgrade.timer apt-daily.timer" [Install] WantedBy=multi-user.target ** Bug watch added: github.com/systemd/systemd/issues #12956 https://github.com/systemd/systemd/issues/12956 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1896614 Title: Race condition when starting dbus services Status in systemd package in Ubuntu: New Status in systemd source package in Bionic: New Bug description: In certain scenarios, such as high load environments or when "systemctl daemon-reload" runs at the same time a dbus service is starting (e.g. systemd-logind), systemd is not able to track properly when the service has started, keeping the job 'running' forever. The issue appears when systemd runs the "AddMatch" dbus method call to track the service's "NameOwnerChange" once it has already ran. A working instance would look like this: https://pastebin.ubuntu.com/p/868J6WBRQx/ A failing instance would be: https://pastebin.ubuntu.com/p/HhJZ4p8dT5/ I've been able to reproduce the issue on Bionic (237-3ubuntu10.42) running: sudo systemctl daemon-reload & sudo systemctl restart systemd-logind To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1896614/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
