kripton@miramis ~ $ firefox
Segmentation fault
kripton@miramis ~ $ gdb firefox
GNU gdb (Gentoo 7.4 p1) 7.4
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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For bug reporting instructions, please see:
<http://bugs.gentoo.org/>...
Reading symbols from /usr/bin/firefox...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/firefox 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffe34ce700 (LWP 17666)]

Program received signal SIGSEGV, Segmentation fault.
g_utf8_validate (str=0x0, max_len=-1, end=0x0) at gutf8.c:1800
1800    gutf8.c: No such file or directory.
(gdb) bt
#0  g_utf8_validate (str=0x0, max_len=-1, end=0x0) at gutf8.c:1800
#1  0x00007fffe6c07162 in gconf_value_from_corba_value (value=0x7ffff6d6b650) at gconf-internals.c:181
#2  0x00007fffe6c1468e in gconf_engine_all_entries (conf=<optimized out>, dir=0x7fffe7a05ad1 "/desktop/gnome/sound", err=<optimized out>) at gconf.c:1787
#3  0x00007fffe6c17de4 in cache_pairs_in_dir (client=0x7ffff6dee5e0, dir=0x7fffe7a05ad1 "/desktop/gnome/sound", recursive=0) at gconf-client.c:971
#4  0x00007fffe6c1aebb in gconf_client_add_dir (client=0x7ffff6dee5e0, dirname=0x7fffe7a05ad1 "/desktop/gnome/sound", preload=GCONF_CLIENT_PRELOAD_ONELEVEL, err=0x0) at gconf-client.c:631
#5  0x00007fffe79d670c in setup_event_listener () at gnome-ui-init.c:594
#6  libgnomeui_post_args_parse (program=<optimized out>, mod_info=<optimized out>) at gnome-ui-init.c:636
#7  0x00007fffe72c74ce in gnome_program_postinit (program=0x7ffff6d4fd50) at gnome-program.c:1835
#8  0x00007fffe72c78f9 in gnome_program_init_common (type=<optimized out>, app_id=0x7ffff5e8fc15 "Gecko", app_version=0x7ffff5f5b936 "1.0", module_info=<optimized out>, argc=<optimized out>, argv=<optimized out>, first_property_name=0x0, args=0x7fffffffa4d0, 
    nparams=-1, params=0x0) at gnome-program.c:2072
#9  0x00007fffe72c7b6d in gnome_program_initv (type=<optimized out>, app_id=<optimized out>, app_version=<optimized out>, module_info=<optimized out>, argc=<optimized out>, argv=<optimized out>, first_property_name=0x0, args=0x7fffffffa4d0) at gnome-program.c:2109
#10 0x00007fffe72c7c6a in gnome_program_init (app_id=0x7ffff5e8fc15 "Gecko", app_version=0x7ffff5f5b936 "1.0", module_info=0x7fffe7c1d780, argc=1, argv=0x7fffffffd348, first_property_name=0x0) at gnome-program.c:1888
#11 0x00007ffff51cbccb in ?? () from /usr/lib64/firefox/libxul.so
#12 0x00007ffff51c4f98 in XRE_main () from /usr/lib64/firefox/libxul.so
#13 0x00000000004024c4 in _start ()
(gdb) q
A debugging session is active.

        Inferior 1 [process 17662] will be killed.

Quit anyway? (y or n) y