$ gdb thunar
GNU gdb (GDB) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from thunar...done.
(gdb) r
Starting program: /usr/bin/thunar 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffec22f700 (LWP 11837)]
[New Thread 0x7fffeba2e700 (LWP 11838)]
[New Thread 0x7fffeb01b700 (LWP 11839)]
[New Thread 0x7fffea610700 (LWP 11840)]

Thread 1 "thunar" received signal SIGSEGV, Segmentation fault.
0x00007ffff3b4b25a in XInternAtom () from /usr/lib/libX11.so.6
(gdb) bt
#0  0x00007ffff3b4b25a in XInternAtom () at /usr/lib/libX11.so.6
#1  0x00007fffdb58d7c3 in twp_provider_get_file_menu_items (menu_provider=<optimized out>, window=<optimized out>, files=<optimized out>) at twp-provider.c:183
#2  0x00007ffff7bd0ddc in thunarx_menu_provider_get_file_menu_items (provider=0x555555d3aef0, window=window@entry=0x555555b14300, files=files@entry=0x555555a00ca0 = {...}) at thunarx-menu-provider.c:123
#3  0x00005555555d233f in thunar_window_update_custom_actions (view=<optimized out>, pspec=<optimized out>, window=0x555555b14300) at thunar-window.c:3462
#4  0x00007ffff4f93a4d in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
#5  0x00007ffff4fa6e40 in  () at /usr/lib/libgobject-2.0.so.0
#6  0x00007ffff4faf6f6 in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
#7  0x00007ffff4fb0130 in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
#8  0x00007ffff4f98076 in  () at /usr/lib/libgobject-2.0.so.0
#9  0x00007ffff4f9a68a in g_object_notify_by_pspec () at /usr/lib/libgobject-2.0.so.0
#10 0x00005555555c0d70 in thunar_standard_view_selection_changed (standard_view=0x555555cb9bc0) at thunar-standard-view.c:4567
#11 0x00007ffff4f93c96 in  () at /usr/lib/libgobject-2.0.so.0
#12 0x00007ffff4faf9e9 in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
#13 0x00007ffff4fb0130 in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
#14 0x00007ffff69a98e5 in  () at /usr/lib/libgtk-3.so.0
#15 0x00007ffff69adc97 in  () at /usr/lib/libgtk-3.so.0
#16 0x00007ffff6874370 in  () at /usr/lib/libgtk-3.so.0
#17 0x00007ffff4f93a4d in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
#18 0x00007ffff4fa6bca in  () at /usr/lib/libgobject-2.0.so.0
#19 0x00007ffff4faec41 in g_signal_emitv () at /usr/lib/libgobject-2.0.so.0
#20 0x00007ffff6756633 in  () at /usr/lib/libgtk-3.so.0
#21 0x00007ffff6756b38 in  () at /usr/lib/libgtk-3.so.0
#22 0x00007ffff6756cd1 in  () at /usr/lib/libgtk-3.so.0
#23 0x00007ffff6757e9f in gtk_bindings_activate_event () at /usr/lib/libgtk-3.so.0
#24 0x00007ffff69af2f8 in  () at /usr/lib/libgtk-3.so.0
#25 0x00007ffff6873bfc in  () at /usr/lib/libgtk-3.so.0
#26 0x00007ffff4f93962 in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
#27 0x00007ffff4fa6bca in  () at /usr/lib/libgobject-2.0.so.0
#28 0x00007ffff4faf081 in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
#29 0x00007ffff4fb0130 in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
#30 0x00007ffff69c3ae5 in  () at /usr/lib/libgtk-3.so.0
#31 0x00007ffff69e4d14 in gtk_window_propagate_key_event () at /usr/lib/libgtk-3.so.0
#32 0x00007ffff69e88bc in  () at /usr/lib/libgtk-3.so.0
#33 0x00007ffff6873cf8 in  () at /usr/lib/libgtk-3.so.0
#34 0x00007ffff4f93c96 in  () at /usr/lib/libgobject-2.0.so.0
#35 0x00007ffff4faf3a4 in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
#36 0x00007ffff4fb0130 in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
#37 0x00007ffff69c3ae5 in  () at /usr/lib/libgtk-3.so.0
#38 0x00007ffff6870c22 in  () at /usr/lib/libgtk-3.so.0
#39 0x00007ffff6872d03 in gtk_main_do_event () at /usr/lib/libgtk-3.so.0
#40 0x00007ffff6382526 in  () at /usr/lib/libgdk-3.so.0
#41 0x00007ffff63ded05 in  () at /usr/lib/libgdk-3.so.0
#42 0x00007ffff4cb9368 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#43 0x00007ffff4cb95b1 in  () at /usr/lib/libglib-2.0.so.0
#44 0x00007ffff4cb963e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#45 0x00007ffff527a97e in g_application_run () at /usr/lib/libgio-2.0.so.0
#46 0x00005555555740cb in main (argc=1, argv=0x7fffffffe5d8) at main.c:161
(gdb)