Comment 3 for bug 1034574

backtrace w/ nautilus-dbg installed:

GNU gdb (Linaro GDB) 7.4-2012.06-ubuntu
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/nautilus...Reading symbols from /usr/lib/debug/usr/bin/nautilus...done.
done.
(gdb) run
Starting program: /usr/bin/nautilus
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffebbd2700 (LWP 25372)]

(nautilus:25369): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:62:15: Not using units is deprecated. Assuming 'px'.

(nautilus:25369): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:62:17: Not using units is deprecated. Assuming 'px'.
[New Thread 0x7fffe8f49700 (LWP 25373)]
[New Thread 0x7fffe3fff700 (LWP 25374)]
Initializing nautilus-dropbox 0.7.1
[New Thread 0x7fffd7fff700 (LWP 25375)]
Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated.
Fontconfig warning: "/etc/fonts/infinality/conf.d/41-repl-os-osx.conf", line 15: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/41-repl-os-osx.conf", line 27: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/41-repl-os-osx.conf", line 38: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/41-repl-os-osx.conf", line 48: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/41-repl-os-osx.conf", line 61: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/41-repl-os-osx.conf", line 73: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/41-repl-os-osx.conf", line 100: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/41-repl-os-osx.conf", line 109: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/60-group-non-tt-fonts.conf", line 483: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/60-group-tt-fonts.conf", line 262: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/62-tt-monospace-rendering.conf", line 27: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/62-tt-traced-bitmap-rendering.conf", line 21: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/infinality/conf.d/62-tt-traced-bitmap-rendering.conf", line 50: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-droid-sans-fonts.conf", line 103: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-droid-sans-fonts.conf", line 138: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/89-tlwg-garuda-synthetic.conf", line 9: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/89-tlwg-garuda-synthetic.conf", line 21: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/89-tlwg-kinnari-synthetic.conf", line 9: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/89-tlwg-kinnari-synthetic.conf", line 21: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/89-tlwg-loma-synthetic.conf", line 12: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/89-tlwg-umpush-synthetic.conf", line 9: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/89-tlwg-umpush-synthetic.conf", line 21: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 9: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 22: Having multiple <family> in <alias> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 22: Having multiple <family> in <alias> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 22: Having multiple <family> in <alias> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 26: Having multiple <family> in <alias> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 31: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum.conf", line 40: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-unfonts-core.conf", line 11: Having multiple values in <test> isn't supported and may not works as expected
[New Thread 0x7fffbfc78700 (LWP 25377)]
[New Thread 0x7fffbf02a700 (LWP 25379)]

** (nautilus:25369): WARNING **: Can not calculate _NET_NUMBER_OF_DESKTOPS

** (nautilus:25369): WARNING **: Can not calculate _NET_NUMBER_OF_DESKTOPS

** (nautilus:25369): WARNING **: Can not get _NET_WORKAREA

** (nautilus:25369): WARNING **: Can not determine workarea, guessing at layout
[Thread 0x7fffe3fff700 (LWP 25374) exited]
[Thread 0x7fffbfc78700 (LWP 25377) exited]
[New Thread 0x7fffbfc78700 (LWP 25392)]
[Thread 0x7fffbfc78700 (LWP 25392) exited]

Program received signal SIGSEGV, Segmentation fault.
icon_set_selected (container=0xea2200, icon=0x0, select=1)
    at nautilus-canvas-container.c:479
479 nautilus-canvas-container.c: No such file or directory.
(gdb) bt
#0 icon_set_selected (container=0xea2200, icon=0x0, select=1)
    at nautilus-canvas-container.c:479
#1 0x0000000000492fa1 in nautilus_canvas_container_select_first (
    container=0xea2200) at nautilus-canvas-container.c:6798
#2 0x000000000046fd91 in nautilus_view_select_first (view=0x10282e0)
    at nautilus-view.c:406
#3 done_loading (view=view@entry=0x10282e0,
    all_files_seen=all_files_seen@entry=1) at nautilus-view.c:3153
#4 0x000000000047659a in display_pending_files (view=0x10282e0)
    at nautilus-view.c:3610
#5 display_pending_callback (data=<optimized out>) at nautilus-view.c:3705
#6 0x00007ffff46ea7eb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7 0x00007ffff46e9c65 in g_main_context_dispatch ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8 0x00007ffff46e9f98 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9 0x00007ffff46ea054 in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007ffff4c8972c in g_application_run ()
   from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#11 0x000000000042b95b in main (argc=1, argv=0x7fffffffe258)
    at nautilus-main.c:103
(gdb) quit
A debugging session is active.

 Inferior 1 [process 25369] will be killed.

Quit anyway? (y or n) y

May have something to do with the icon theme, which is Faience? But still shouldn't crash nautilus.