(gdb) bt
#0  0x00007f9d399711a8 in poll () from /lib/libc.so.6
#1  0x00007f9d35bba2da in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f9d35bbbf4c in xcb_wait_for_reply () from /usr/lib/libxcb.so.1
#3  0x00007f9d390e4993 in _XReply () from /usr/lib/libX11.so.6
#4  0x00007f9d390c16e7 in XGetWindowProperty () from /usr/lib/libX11.so.6
#5  0x00007f9d2e126b35 in xkl_config_rec_get_from_root_window_property () from /usr/lib/libxklavier.so.16
#6  0x00007f9d2e127075 in xkl_config_rec_get_full_from_server () from /usr/lib/libxklavier.so.16
#7  0x00007f9d2e756155 in ?? () from /usr/lib/gnome-settings-daemon-2.0/libkeyboard.so
#8  0x00007f9d3a10b6ce in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#9  0x00007f9d3a123f59 in ?? () from /usr/lib/libgobject-2.0.so.0
#10 0x00007f9d3a1256d6 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#11 0x00007f9d3a1259fd in g_signal_emit_by_name () from /usr/lib/libgobject-2.0.so.0
#12 0x00007f9d2e11f0be in xkl_engine_process_state_modification () from /usr/lib/libxklavier.so.16
#13 0x00007f9d2e1238e2 in xkl_xkb_process_x_event () from /usr/lib/libxklavier.so.16
#14 0x00007f9d2e11fe14 in xkl_engine_filter_events () from /usr/lib/libxklavier.so.16
#15 0x00007f9d2e756013 in ?? () from /usr/lib/gnome-settings-daemon-2.0/libkeyboard.so
#16 0x00007f9d3963b5f6 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#17 0x00007f9d3963d718 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#18 0x00007f9d3963dc7e in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#19 0x00007f9d39c57cb2 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#20 0x00007f9d39c5bc18 in ?? () from /lib/libglib-2.0.so.0
#21 0x00007f9d39c5c125 in g_main_loop_run () from /lib/libglib-2.0.so.0
#22 0x00007f9d3af54a47 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#23 0x000000000040429a in main ()