eric@kingfisher:~$ gdb gnome-boxes
GNU gdb (Ubuntu/Linaro 7.4-2012.02-0ubuntu2) 7.4-2012.02
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://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /usr/bin/gnome-boxes...done.
(gdb) run
Starting program: /usr/bin/gnome-boxes
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe7505700 (LWP 2967)]
[New Thread 0x7fffe6d04700 (LWP 2968)]
Mesa: Initializing x86-64 optimizations
Mesa: Initializing x86-64 optimizations

(gnome-boxes:2964): Gtk-WARNING **: Theme parsing error: gtk-style.css:96:14: Not using units is deprecated. Assuming 'px'.

(gnome-boxes:2964): Gtk-WARNING **: Theme parsing error: gtk-style.css:96:16: Not using units is deprecated. Assuming 'px'.

(gnome-boxes:2964): Gtk-WARNING **: Theme parsing error: gtk-style.css:98:20: Not using units is deprecated. Assuming 'px'.

(gnome-boxes:2964): Gtk-WARNING **: Theme parsing error: gtk-style.css:124:20: Not using units is deprecated. Assuming 'px'.

(gnome-boxes:2964): Gtk-WARNING **: Theme parsing error: gtk-style.css:134:20: Not using units is deprecated. Assuming 'px'.

(gnome-boxes:2964): Gtk-WARNING **: Theme parsing error: gtk-style.css:146:20: Not using units is deprecated. Assuming 'px'.

(gnome-boxes:2964): Gtk-WARNING **: Theme parsing error: gtk-style.css:156:21: Not using units is deprecated. Assuming 'px'.

(gnome-boxes:2964): Boxes-CRITICAL **: media-manager.vala:26: Error connecting to Tracker: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Tracker1 was not provided by any .service files

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff50aed40 in tracker_sparql_connection_query_async ()
   from /usr/lib/libtracker-sparql-0.14.so.0
(gdb) bt
#0  0x00007ffff50aed40 in tracker_sparql_connection_query_async ()
   from /usr/lib/libtracker-sparql-0.14.so.0
#1  0x00000000004344e0 in boxes_media_manager_list_installer_medias_co (
    _data_=0x253c130) at media-manager.c:737
#2  0x000000000044df6a in boxes_wizard_source_add_media_entries_co (
    _data_=0x253b0b0) at wizard-source.c:664
#3  0x000000000044f126 in boxes_wizard_source_construct (
    object_type=<optimized out>, media_manager=<optimized out>)
    at wizard-source.c:542
#4  0x0000000000452db5 in boxes_wizard_constructor (type=<optimized out>,
    n_construct_properties=<optimized out>,
    construct_properties=<optimized out>) at wizard.c:2803
#5  0x00007ffff4b19be2 in g_object_newv ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6  0x00007ffff4b1a1cc in g_object_new ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7  0x0000000000451d9f in boxes_wizard_construct (object_type=<optimized out>,
    app=0x14ed0e0) at wizard.c:635
#8  0x000000000041e23e in boxes_app_setup_ui (self=0x14ed0e0) at app.c:2618
#9  __lambda106_ (app=<optimized out>, self=0x14ed0e0) at app.c:1034
#10 ___lambda106__g_application_startup (_sender=<optimized out>,
---Type <return> to continue, or q <return> to quit---
    self=0x14ed0e0) at app.c:1046
#11 0x00007ffff4b12c82 in g_closure_invoke ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007ffff4b23fbd in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007ffff4b2c079 in g_signal_emit_valist ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007ffff4b2c222 in g_signal_emit ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#15 0x00007ffff4de953b in g_application_register ()
   from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#16 0x00007ffff4de9835 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#17 0x00007ffff4de9ad8 in g_application_run ()
   from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#18 0x0000000000436020 in _vala_main (args=0x7fffffffe248, args_length1=1)
    at main.c:493
#19 0x00007ffff425576d in __libc_start_main ()
   from /lib/x86_64-linux-gnu/libc.so.6
#20 0x000000000041a919 in _start ()