$ gdb ristretto                                                                      
GNU gdb (GDB) Fedora (6.8.50.20090302-33.fc11)                                                       
Copyright (C) 2009 Free Software Foundation, Inc.                                                    
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>                        
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(gdb) run                                                                                            
Starting program: /usr/bin/ristretto                                                                 
[Thread debugging using libthread_db enabled]                                                        
** (ristretto:17299): DEBUG: xfdesktop is not running                                                
[New Thread 0x7fffefd77910 (LWP 17302)]                                                              
[New Thread 0x7fffef376910 (LWP 17303)]                                                              
[Thread 0x7fffef376910 (LWP 17303) exited]                                                           
[New Thread 0x7fffef376910 (LWP 17304)]                                                              
[Thread 0x7fffef376910 (LWP 17304) exited]                                                           

(ristretto:17299): Gdk-CRITICAL **: gdk_x11_atom_to_xatom_for_display: assertion `atom != GDK_NONE' failed                                                                                                

(ristretto:17299): GdkPixbuf-CRITICAL **: gdk_pixbuf_copy: assertion `GDK_IS_PIXBUF (pixbuf)' failed

(ristretto:17299): GdkPixbuf-CRITICAL **: gdk_pixbuf_copy: assertion `GDK_IS_PIXBUF (pixbuf)' failed

Program received signal SIGSEGV, Segmentation fault.
0x00000035be60613e in IA__gdk_pixbuf_copy (pixbuf=0x89e320) at gdk-pixbuf.c:294
294             g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);           
(gdb) thread apply all bt                                                      

Thread 2 (Thread 0x7fffefd77910 (LWP 17302)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()   
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:220
#1  0x00000035bd602382 in g_cond_timed_wait_posix_impl (cond=0x7fffe80015c4, entered_mutex=0x80, 
    abs_time=<value optimized out>) at gthread-posix.c:242                                       
#2  0x00000035bce141ff in g_async_queue_pop_intern_unlocked (queue=0x950150, try=0,              
    end_time=0x7fffefd76fa0) at gasyncqueue.c:365                                                
#3  0x00000035bce61dd0 in g_thread_pool_wait_for_new_task (pool=<value optimized out>)           
    at gthreadpool.c:220                                                                         
#4  g_thread_pool_thread_proxy (pool=<value optimized out>) at gthreadpool.c:254                 
#5  0x00000035bce60934 in g_thread_create_proxy (data=0x9501b0) at gthread.c:635
#6  0x000000334220686a in start_thread (arg=<value optimized out>) at pthread_create.c:297
#7  0x00000033416de25d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ffff76957e0 (LWP 17299)):
#0  0x00000035be60613e in IA__gdk_pixbuf_copy (pixbuf=0x89e320) at gdk-pixbuf.c:294
#1  0x000000000040f21a in cb_rstto_navigator_entry_update_image (entry=0xa31b10) at navigator.c:1372
#2  0x00000035bce381cb in g_timeout_dispatch (source=0x99e400, callback=0, user_data=0x700000008)
---Type <return> to continue, or q <return> to quit---
    at gmain.c:3260
#3  0x00000035bce37abe in g_main_dispatch (context=<value optimized out>) at gmain.c:1824
#4  IA__g_main_context_dispatch (context=<value optimized out>) at gmain.c:2377
#5  0x00000035bce3b278 in g_main_context_iterate (context=0x6552b0, block=<value optimized out>,
    dispatch=<value optimized out>, self=<value optimized out>) at gmain.c:2455
#6  0x00000035bce3b6d5 in IA__g_main_loop_run (loop=0x8ba9e0) at gmain.c:2663
#7  0x00000035c03279c7 in IA__gtk_main () at gtkmain.c:1205
#8  0x0000000000408d37 in main (argc=1, argv=0x7fffffffdfb8) at main.c:342
Current language:  auto; currently asm
Current language:  auto; currently c
(gdb)