When hitting ctrl-space (set-mark-command), emacs reproducibly crashes.
#0 XVisualIDFromVisual (visual=0x0) at Misc.c:60
#1 0x00007f8ef5a4e2de in gdk_x11_window_foreign_new_for_display
(display=0x22220e0 [GdkX11Display], window=90177538) at
x11/gdkwindow-x11.c:1270
#2 0x00007f8ef5a39478 in gdk_x11_display_translate_event
(translator=<optimized out>, display=0x22220e0 [GdkX11Display],
event=0x2238be0, xevent=0xa7e3b0 <old_fcntl_owner+1168>) at
x11/gdkdisplay-x11.c:1116
#3 0x00007f8ef5a3acc1 in _gdk_x11_event_translator_translate
(translator=0x22220e0, display=0x22220e0 [GdkX11Display],
xevent=xevent@entry=0xa7e3b0 <old_fcntl_owner+1168>) at
x11/gdkeventtranslator.c:51
#4 0x00007f8ef5a3e800 in gdk_event_source_translate_event (xevent=0xa7e3b0
<old_fcntl_owner+1168>, event_source=0x2239a30) at x11/gdkeventsource.c:243
#5 _gdk_x11_display_queue_events (display=0x22220e0 [GdkX11Display]) at
x11/gdkeventsource.c:341
#6 0x00007f8ef5a056a9 in gdk_display_get_event (display=0x22220e0
[GdkX11Display]) at gdkdisplay.c:442
#7 0x00007f8ef5a3ea22 in gdk_event_source_dispatch
(source=source@entry=0x2239a30, callback=<optimized out>, user_data=<optimized
out>) at x11/gdkeventsource.c:363
#8 0x00007f8ef54288b7 in g_main_dispatch (context=0x2239b20) at
../glib/gmain.c:3337
#9 g_main_context_dispatch (context=0x2239b20) at ../glib/gmain.c:4055
#10 0x00007f8ef5428c38 in g_main_context_iterate
(context=context@entry=0x2239b20, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>)
at ../glib/gmain.c:4131
#11 0x00007f8ef5428cef in g_main_context_iteration (context=0x2239b20,
context@entry=0x0, may_block=may_block@entry=1) at ../glib/gmain.c:4196
#12 0x00007f8ef5d19385 in gtk_main_iteration () at gtkmain.c:1433
#13 0x00000000004ed0c3 in XTread_socket (terminal=<optimized out>,
hold_quit=0xa7e620 <old_fcntl_owner+1792>) at xterm.c:9396
#14 0x0000000000514312 in gobble_input () at keyboard.c:6892
#15 0x00000000005865a5 in handle_async_input () at keyboard.c:7129
#16 process_pending_signals () at keyboard.c:7143