$ gdb thunar
GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/thunar...done.
(gdb) run
Starting program: /usr/bin/thunar 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe2d05700 (LWP 13256)]

(thunar:13253): Gtk-WARNING **: Refusing to add non-unique action 'ThunarUca::manage-actions' to action group 'ThunarWindow'

Program received signal SIGSEGV, Segmentation fault.
0x00007fffe19ddf49 in ?? ()
   from /usr/lib/x86_64-linux-gnu/thunarx-2/thunar-uca.so
(gdb) backtrace
#0  0x00007fffe19ddf49 in ?? ()
   from /usr/lib/x86_64-linux-gnu/thunarx-2/thunar-uca.so
#1  0x00007fffe19dfb9f in ?? ()
   from /usr/lib/x86_64-linux-gnu/thunarx-2/thunar-uca.so
#2  0x00007ffff7bd5075 in thunarx_menu_provider_get_file_actions ()
   from /usr/lib/x86_64-linux-gnu/libthunarx-2.so.0
#3  0x0000000000488b91 in thunar_standard_view_merge_custom_actions (
    selected_items=0x928540, standard_view=0xad2060)
    at thunar-standard-view.c:2000
#4  thunar_standard_view_context_menu (standard_view=0xad2060, 
    button=button@entry=3, timestamp=timestamp@entry=2124592)
    at thunar-standard-view.c:4045
#5  0x000000000043723a in thunar_details_view_button_press_event (
    tree_view=<optimized out>, event=<optimized out>, details_view=0xad2060)
    at thunar-details-view.c:692
#6  0x00007ffff6830099 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#7  0x00007ffff4ea16e0 in g_closure_invoke ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007ffff4eb2750 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#9  0x00007ffff4eba2db in g_signal_emit_valist ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#10 0x00007ffff4eba852 in g_signal_emit ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007ffff694793e in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#12 0x00007ffff682e434 in gtk_propagate_event ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#13 0x00007ffff682e78b in gtk_main_do_event ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#14 0x00007ffff649b7ac in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#15 0x00007ffff4be2355 in g_main_context_dispatch ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007ffff4be2688 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007ffff4be2a82 in g_main_loop_run ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007ffff682d797 in gtk_main ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#19 0x00000000004223b8 in main (argc=1, argv=0x7fffffffe448) at main.c:310
(gdb)