Today I stopped being able to log in to Gnome 3 on OpenSUSE 13.1. When I enter my password, I get kicked out immediately and find myself back at the login screen.
This is /var/log/messages after I try to log in (a longer version is here):
2014-12-25T17:28:16.368773+01:00 ondra gdm-password]: pam_unix(gdm-password:session): session opened for user ondra by (unknown)(uid=0)
2014-12-25T17:28:16.370671+01:00 ondra systemd[1]: Starting user-1000.slice.
2014-12-25T17:28:16.371095+01:00 ondra systemd[1]: Created slice user-1000.slice.
2014-12-25T17:28:16.371711+01:00 ondra systemd[1]: Starting User Manager for 1000...
2014-12-25T17:28:16.373705+01:00 ondra systemd[1]: Starting Session 3 of user ondra.
2014-12-25T17:28:16.374616+01:00 ondra systemd-logind[1972]: New session 3 of user ondra.
2014-12-25T17:28:16.375140+01:00 ondra systemd-logind[1972]: Linked /tmp/.X11-unix/X0 to /run/user/1000/X11-display.
2014-12-25T17:28:16.375670+01:00 ondra systemd[1]: Started Session 3 of user ondra.
2014-12-25T17:28:16.376117+01:00 ondra systemd: pam_unix(systemd-user:session): session opened for user ondra by (uid=0)
2014-12-25T17:28:16.386869+01:00 ondra systemd[3712]: Failed to open private bus connection: Failed to connect to socket /run/user/1000/dbus/user_bus_socket: No such file or directory
2014-12-25T17:28:16.455219+01:00 ondra systemd[3712]: Mounted /sys/fs/fuse/connections.
2014-12-25T17:28:16.455632+01:00 ondra systemd[3712]: Stopped target Sound Card.
2014-12-25T17:28:16.455896+01:00 ondra systemd[3712]: Stopped target Bluetooth.
2014-12-25T17:28:16.456073+01:00 ondra systemd[3712]: Starting Default.
2014-12-25T17:28:16.456374+01:00 ondra systemd[3712]: Reached target Default.
2014-12-25T17:28:16.456721+01:00 ondra systemd[3712]: Startup finished in 69ms.
2014-12-25T17:28:16.456995+01:00 ondra systemd[1]: Started User Manager for 1000.
2014-12-25T17:28:16.666275+01:00 ondra org.a11y.Bus[2416]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
2014-12-25T17:24:44.498774+01:00 ondra gnome-session[2343]: message repeated 4 times: (gnome-settings-daemon:2668): GLib-GObject-WARNING **: value "100.000000" of type 'gdouble' is invalid or out of range for property 'percentage' of type 'gdouble']
2014-12-25T17:28:16.666689+01:00 ondra gnome-session[2343]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
2014-12-25T17:28:16.666974+01:00 ondra org.a11y.atspi.Registry[2535]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
2014-12-25T17:28:16.670887+01:00 ondra gnome-session[2343]: (gnome-settings-daemon:2668): GLib-GIO-WARNING **: Error releasing name org.gnome.SettingsDaemon: The connection is closed
2014-12-25T17:28:16.671113+01:00 ondra gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session closed for user gdm
2014-12-25T17:28:16.671445+01:00 ondra ca.desrt.dconf[2416]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
2014-12-25T17:28:16.676767+01:00 ondra xdm[2015]: Failed to remove slave program access to the display. Trying to proceed.
2014-12-25T17:28:16.678153+01:00 ondra colord: Automatic remove of icc-3247ef85ac3aca108a18f565aae5186f from xrandr-Fujitsu Siemens Computers GmbH-P15-1A-YEBK204250
2014-12-25T17:28:16.678508+01:00 ondra colord: Profile removed: icc-3247ef85ac3aca108a18f565aae5186f
2014-12-25T17:28:16.678701+01:00 ondra colord: Automatic remove of icc-a4264fcfa733140182a5d0986b3bee6d from xrandr-LVDS1
2014-12-25T17:28:16.678886+01:00 ondra colord: Profile removed: icc-a4264fcfa733140182a5d0986b3bee6d
2014-12-25T17:28:16.679068+01:00 ondra colord: device removed: xrandr-LVDS1
2014-12-25T17:28:16.679249+01:00 ondra colord: device removed: xrandr-Fujitsu Siemens Computers GmbH-P15-1A-YEBK204250
2014-12-25T17:28:16.681500+01:00 ondra kernel: 247.379203] show_signal_msg: 87 callbacks suppressed
2014-12-25T17:28:16.681518+01:00 ondra kernel: 247.379209] gnome-shell[2968]: segfault at 7f9bea877fd0 ip 00007f9be60be715 sp 00007fffd092ada0 error 4 in libc-2.18.so[7f9be6045000+1a5000]
2014-12-25T17:28:16.689453+01:00 ondra polkitd[2022]: Unregistered Authentication Agent for unix-session:1 (system bus name :1.24, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_GB.UTF-8) (disconnected from bus)
2014-12-25T17:28:16.697354+01:00 ondra /etc/gdm/Xsession[3719]: /etc/X11/xinit/xinitrc.common: line 92: xmessage: command not found
2014-12-25T17:28:16.697752+01:00 ondra /etc/gdm/Xsession[3719]: /etc/X11/xinit/xinitrc.common: line 1: exec: xterm: not found
2014-12-25T17:28:16.697933+01:00 ondra gdm-password]: pam_unix(gdm-password:session): session closed for user ondra
2014-12-25T17:28:16.734802+01:00 ondra systemd-logind[1972]: Removed session 3.
What could be the problem?