Comment 3 for bug 1426362

The server (vm) used as a management gateway to other service. Sessions opened by SSH. Remote machine opens a SSH connection with a key, by SSH force command, a python script opens, do the stuffs, and exits.

Sessions are in 'closing' state, but no processes (not even zombies) are exist under this user.

root@ad:/run/systemd/sessions# grep -r 'STATE' . | grep closing | wc -l
12419

root@ad:/run/systemd/sessions# grep -r 'STATE' . | grep -v closing | wc -l
1

root@ad:/run/systemd/sessions# loginctl list-users
       UID USER
      1001 ad-sync-prod
         0 root
root@ad:/run/systemd/sessions# ps -u ad-sync-prod
  PID TTY TIME CMD
<empty list>

root@ad:/run/systemd/sessions# loginctl user-status ad-sync-prod
ad-sync-prod (1001)
           Since: Fri 2015-02-27 13:40:08 CET; 5 days ago
           State: opening
Failed to query ControlGroup: No such interface 'org.freedesktop.systemd1.Slice'
        Sessions: 35752 35751 35750 35749 35748 35747 35746 35745 35744 35743 35742 35740 35739 35738 35737 35736 35735 35734 35733 35732 35731 35730 35729 35728 35726 35725 35724 35723 35722
            Unit: user-1001.slice