#0  0x00007ffff76d3240 in _XError () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#1  0x00007ffff76d0311 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#2  0x00007ffff76d1297 in _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#3  0x00007ffff76b6ec4 in XGetWindowProperty () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#4  0x0000000000416619 in get_mwm_prop ()
#5  0x000000000041442b in event_filter_func ()
#6  0x00007ffff6bc1e26 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#7  0x00007ffff6bc3bd6 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#8  0x00007ffff6bc3c7e in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#9  0x00007ffff5b16d53 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007ffff5b170a0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007ffff5b1749a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007ffff6f4e2f7 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#13 0x000000000040ad50 in main ()