Description of problem:
gdm won't start. Using startx works OK.

Version-Release number of selected component:
gnome-shell-3.18.3-1.fc23

Additional info:
reporter:       libreport-2.6.3
backtrace_rating: 4
cmdline:        gnome-shell --mode=gdm --wayland --display-server
crash_function: meta_window_wayland_new
executable:     /usr/bin/gnome-shell
global_pid:     2224
kernel:         4.2.6-301.fc23.x86_64
runlevel:       unknown
type:           CCpp
uid:            42

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 meta_window_wayland_new at wayland/meta-window-wayland.c:446
 #1 xdg_shell_get_xdg_surface at wayland/meta-wayland-surface.c:1396
 #2 ffi_call_unix64 at ../src/x86/unix64.S:76
 #3 ffi_call at ../src/x86/ffi64.c:525
 #4 wl_closure_invoke at src/connection.c:945
 #5 wl_client_connection_data at src/wayland-server.c:339
 #6 wl_event_loop_dispatch at src/event-loop.c:422
 #7 wayland_event_source_dispatch at wayland/meta-wayland.c:85
 #12 meta_xwayland_start at wayland/meta-xwayland.c:541
 #13 meta_wayland_init at wayland/meta-wayland.c:344

Potential duplicate: bug 1199711