$ gdb pcmanfm
GNU gdb (GDB) 7.2-alt1 (ALT Linux)
Copyright (C) 2010 Free Software Foundation, Inc.
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Reading symbols from /usr/bin/pcmanfm...Reading symbols from /usr/lib/debug/usr/bin/pcmanfm.debug...done.
done.
(gdb) run
Starting program: /usr/bin/pcmanfm 
[Thread debugging using libthread_db enabled]
Detaching after fork from child process 4687.
Detaching after fork from child process 4688.
** (pcmanfm:4684): DEBUG: unable to load icon system-software-install
[New Thread 0x7fffef8d6700 (LWP 4689)]
[New Thread 0x7fffeed21700 (LWP 4690)]
[New Thread 0x7fffee520700 (LWP 4691)]
[New Thread 0x7fffedd1f700 (LWP 4692)]
[Thread 0x7fffee520700 (LWP 4691) exited]
[Thread 0x7fffedd1f700 (LWP 4692) exited]
[Thread 0x7fffeed21700 (LWP 4690) exited]
[New Thread 0x7fffeed21700 (LWP 4693)]

(pcmanfm:4684): Gtk-CRITICAL **: IA__gtk_entry_get_text: assertion `GTK_IS_ENTRY (entry)' failed

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5b0dc10 in _g_utf8_normalize_wc (str=0x0, max_len=-1, 
    mode=G_NORMALIZE_ALL) at gunidecomp.c:364
364	  while ((max_len < 0 || p < str + max_len) && *p)
(gdb) bt
#0  0x00007ffff5b0dc10 in _g_utf8_normalize_wc (str=0x0, max_len=-1, 
    mode=G_NORMALIZE_ALL) at gunidecomp.c:364
#1  0x00007ffff5b0e293 in g_utf8_normalize (str=<value optimized out>, 
    len=<value optimized out>, mode=<value optimized out>) at gunidecomp.c:525
#2  0x00007ffff72e9334 in IA__gtk_entry_completion_complete (
    completion=0x796b70) at gtkentrycompletion.c:1177
#3  0x00007ffff72d72d8 in check_completion_callback (completion=0x796b70)
    at gtkentry.c:9651
#4  0x00007ffff5db4859 in source_closure_marshal_BOOLEAN__VOID (
    closure=<value optimized out>, return_value=0x7fffffffdfa0, 
    n_param_values=<value optimized out>, param_values=<value optimized out>, 
    invocation_hint=<value optimized out>, marshal_data=<value optimized out>)
    at gsourceclosure.c:71
#5  0x00007ffff5d9729e in g_closure_invoke (closure=0x7fffe8038980, 
    return_value=0x7fffffffdfa0, n_param_values=0, param_values=0x0, 
    invocation_hint=0x0) at gclosure.c:767
#6  0x00007ffff5db48f2 in source_closure_callback (data=<value optimized out>)
    at gsourceclosure.c:113
#7  0x00007ffff5adaa5f in g_main_dispatch (context=0x65cdf0) at gmain.c:2440
#8  g_main_context_dispatch (context=0x65cdf0) at gmain.c:3013
#9  0x00007ffff5adb270 in g_main_context_iterate (context=0x65cdf0, block=1, 
    dispatch=1, self=<value optimized out>) at gmain.c:3091
#10 0x00007ffff5adb942 in g_main_loop_run (loop=0x696120) at gmain.c:3299
#11 0x00007ffff7350b67 in IA__gtk_main () at gtkmain.c:1256
#12 0x000000000040e355 in main (argc=1, argv=0x7fffffffe298) at pcmanfm.c:199
(gdb)