nm-applet segfaults when opening windows on Wayland
I'm running nm-applet with Waybar and sway on Wayland. There is a 100% reproducible crash when nm-applet opens a window like "Connection Information" or the wifi password entry. The issue goes away if nm-applet is forced to run under X11 with GDK_BACKEND=x11 nm-applet. The stack trace also includes a few x11 references so it seems related:
$ gdb nm-applet
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Reading symbols from nm-applet...
(No debugging symbols found in nm-applet)
(gdb) run
Starting program: /usr/bin/nm-applet
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff409a700 (LWP 13080)]
[New Thread 0x7ffff3899700 (LWP 13081)]
[New Thread 0x7ffff306c700 (LWP 13082)]
[New Thread 0x7ffff286b700 (LWP 13083)]
[New Thread 0x7ffff1ea3700 (LWP 13084)]
(nm-applet:13076): Gtk-WARNING **: 19:18:53.784: Can't set a parent on widget which has a parent
[Thread 0x7ffff1ea3700 (LWP 13084) exited]
(nm-applet:13076): Gtk-CRITICAL **: 19:18:55.232: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed
(nm-applet:13076): Gtk-CRITICAL **: 19:18:55.232: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed
(nm-applet:13076): Gtk-WARNING **: 19:18:55.245: Can't set a parent on widget which has a parent
(nm-applet:13076): Gtk-CRITICAL **: 19:18:55.255: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed
(nm-applet:13076): Gtk-CRITICAL **: 19:18:55.255: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed
(nm-applet:13076): Gtk-WARNING **: 19:18:55.266: Can't set a parent on widget which has a parent
Thread 1 "nm-applet" received signal SIGSEGV, Segmentation fault.
0x00007ffff68b468a in ?? () from /lib/x86_64-linux-gnu/libX11.so.6
(gdb) bt
#0 0x00007ffff68b468a in () at /lib/x86_64-linux-gnu/libX11.so.6
#1 0x00007ffff68b4a3a in XInternAtom () at /lib/x86_64-linux-gnu/libX11.so.6
#2 0x00007ffff75586cc in gdk_x11_atom_to_xatom_for_display () at /lib/x86_64-linux-gnu/libgdk-3.so.0
#3 0x00007ffff756764d in gdk_x11_get_server_time () at /lib/x86_64-linux-gnu/libgdk-3.so.0
#4 0x0000555555571d86 in ()
#5 0x00007ffff710ae8d in g_closure_invoke () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6 0x00007ffff711e555 in () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7 0x00007ffff71274ae in g_signal_emit_valist () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8 0x00007ffff7127b6f in g_signal_emit () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#9 0x00007ffff69f1ade in () at /lib/x86_64-linux-gnu/libdbusmenu-gtk3.so.4
#10 0x00007ffff710ae8d in g_closure_invoke () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007ffff711e555 in () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007ffff71274ae in g_signal_emit_valist () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007ffff7127b6f in g_signal_emit () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007ffff69d049a in dbusmenu_menuitem_handle_event () at /lib/x86_64-linux-gnu/libdbusmenu-glib.so.4
#15 0x00007ffff69d1937 in () at /lib/x86_64-linux-gnu/libdbusmenu-glib.so.4
#16 0x00007ffff70253e3 in () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007ffff7024958 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007ffff7024d48 in () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007ffff7024ddc in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007ffff72268bd in g_application_run () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#21 0x0000555555564b66 in ()
#22 0x00007ffff6df0b6b in __libc_start_main (main=
0x555555564a20, argc=1, argv=0x7fffffffe1a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe198) at ../csu/libc-start.c:308
#23 0x0000555555564c7a in ()
(gdb) This is running on Ubuntu 19.04 with network-manager-gnome version 1.8.20-1ubuntu1. If you happen to know which debug symbol packages I need to install in Ubuntu to get a better stack trace let me know.