unity-greeter has code to kill upstart, but for some reason this isn't being executed. My best guess is that unity-greeter often (if not always) dies before it exits the GTK main loop. Does it receive a second SIGTERM, or a SIGPIPE? (When lightdm says "Stopping display server, no sessions require it", I would think.) This should be testable.
Amending my earlier comment #7, I do see "Got a SIGTERM" some of the time, but I hardly ever see "Cleaning up" (when unlocking; new logins are another story). Indeed upstart is not to blame: it shuts itself off cleanly when signalled; the problem seems to be that unity-greeter doesn't send out that signal as it is supposed to. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to upstart in Ubuntu. https://bugs.launchpad.net/bugs/1322275 Title: lightdm sessions started by dm-tool lock (or a session locker) never get closed Status in Light Display Manager: New Status in lightdm package in Ubuntu: Confirmed Status in upstart package in Ubuntu: Confirmed Bug description: dm-tool lock starts a new lightdm greeter (for unlocking) and a new logind session. After unlocking the greeter disappears, but the logind session never closes. loginctl session status c24 reports something like: c24 - lightdm (103) Since: Thu 2014-05-22 18:38:27 CEST; 30min ago Leader: 7872 Seat: seat0; vc8 Display: :1 Service: lightdm-greeter; type x11; class greeter State: closing CGroup: systemd:/user/103.user/c24.session └─7907 init --user --startup-event indicator-services-start This results in an accumulation of stale lightdm sessions after using e.g. a session locker for a while. I get this issue on a freshly installed and fully updated Xubuntu 14.04. To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/1322275/+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