SESSION        UID USER             SEAT            
         5        501 bor              seat0           
        43        501 bor              seat0           

Session 43 is current one. Session 5 is lingering from logout in GNOME dialog:

bor@opensuse:~/src/systemd> LC_ALL=C loginctl show-session 5
Id=5
Name=bor
Timestamp=Sat 2014-12-13 20:07:25 MSK
TimestampMonotonic=644324188
VTNr=7
Display=:0
Remote=no
Service=gdm-password
Scope=session-5.scope
Leader=2105
Audit=5
Type=x11
Class=user
Active=no
State=closing
IdleHint=no
IdleSinceHint=0
IdleSinceHintMonotonic=0

The reason is, pulseaudio remains and keeps session running:
  ������user-501.slice
...
    ������session-5.scope
      ������2237 /usr/bin/pulseaudio --start
      ������2264 /usr/lib/pulse/gconf-helper