$ 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>
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-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 13362)]

(thunar:13359): Gtk-WARNING **: Refusing to add non-unique action 'ThunarUca::manage-actions' to action group 'ThunarWindow'
[Thread 0x7fffe2d05700 (LWP 13362) exited]

Program received signal SIGSEGV, Segmentation fault.
0x00007fffe17d7f49 in ?? ()
   from /usr/lib/x86_64-linux-gnu/thunarx-2/thunar-uca.so
(gdb) backtrace
#0  0x00007fffe17d7f49 in ?? ()
   from /usr/lib/x86_64-linux-gnu/thunarx-2/thunar-uca.so
#1  0x00007fffe17d9b9f 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=0x8f8e20, standard_view=0xad0060)
    at thunar-standard-view.c:2000
#4  thunar_standard_view_context_menu (standard_view=0xad0060, 
    button=button@entry=3, timestamp=timestamp@entry=4266781)
    at thunar-standard-view.c:4045
#5  0x000000000043723a in thunar_details_view_button_press_event (
    tree_view=<optimized out>, event=<optimized out>, details_view=0xad0060)
    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=0x7fffffffe468) at main.c:310
(gdb)