Comment 3 for bug 978333

It happened again. xsession-errors shows:

(xfwm4:2042): libxfce4ui-WARNING **: ICE I/O Error

(xfwm4:2042): libxfce4ui-WARNING **: Disconnected from session manager.
** Message: using fallback from indicator to GtkStatusIcon
** Message: xfsm-shutdown-helper.c:1472: Using ConsoleKit to Stop

At this point I switched to the console to cp .xsession-error, and instead of shutting down, got a dialog:

"Shutdown Failed

Unable to perform shutdown
Not Authorized

[Quit]"

Clicking the Quit button logged me out, showing in .xsession-errors:

xfsettingsd: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
xfwm4: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.
terminator: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.

(nm-applet:2179): Gdk-WARNING **: nm-applet: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.

XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0.0"
      after 22 requests (22 known processed) with 0 events remaining.

(bluetooth-applet:2212): Gdk-WARNING **: bluetooth-applet: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.

(polkit-gnome-authentication-agent-1:2176): Gdk-WARNING **: polkit-gnome-authentication-agent-1: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.

(update-notifier:2224): Gdk-WARNING **: update-notifier: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.

blueman-applet: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.

(evolution-alarm-notify:2255): Gdk-WARNING **: evolution-alarm-notify: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.

xfce4-session-logout: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
applet.py: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.

** (zeitgeist-datahub:2187): WARNING **: zeitgeist-datahub.vala:227: Unable to get name "org.gnome.zeitgeist.datahub" on the bus!