.
Thread 3 (Thread 3130):
#0  0x00007f263fcd7373 in poll () from /lib/libc.so.6
No symbol table info available.
#1  0x00007f26227734da in ?? () from /usr/lib/libavahi-common.so.3
No symbol table info available.
#2  0x00007f262277202e in avahi_simple_poll_run ()
   from /usr/lib/libavahi-common.so.3
No symbol table info available.
#3  0x00007f26227727ad in avahi_simple_poll_iterate ()
   from /usr/lib/libavahi-common.so.3
No symbol table info available.
#4  0x00007f26227727dd in avahi_simple_poll_loop ()
   from /usr/lib/libavahi-common.so.3
No symbol table info available.
#5  0x00007f262277332c in ?? () from /usr/lib/libavahi-common.so.3
No symbol table info available.
#6  0x00007f263ff79a04 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#7  0x00007f263fce37bd in clone () from /lib/libc.so.6
No symbol table info available.
#8  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 3126):
#0  0x00007f263ff7e82d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
No symbol table info available.
#1  0x00007f2643355602 in ?? () from /usr/lib/libgthread-2.0.so.0
No symbol table info available.
#2  0x00007f26401a60bf in ?? () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#3  0x00007f26401a61cf in g_async_queue_timed_pop ()
   from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#4  0x00007f26401f50a0 in ?? () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#5  0x00007f26401f3b34 in ?? () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#6  0x00007f263ff79a04 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#7  0x00007f263fce37bd in clone () from /lib/libc.so.6
No symbol table info available.
#8  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (Thread 3124):
#0  0x00007f26408c9891 in g_value_get_boolean ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#1  0x00007f26391e0d37 in ?? () from /usr/lib/gnome-scan-1.0/libgsane.so
No symbol table info available.
#2  0x00007f26391e02ea in meta_param_set_value ()
   from /usr/lib/gnome-scan-1.0/libgsane.so
No symbol table info available.
#3  0x00007f26391dee7f in ?? () from /usr/lib/gnome-scan-1.0/libgsane.so
No symbol table info available.
#4  0x00007f26401c859c in g_list_foreach () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#5  0x00007f26391dec9f in ?? () from /usr/lib/gnome-scan-1.0/libgsane.so
No symbol table info available.
#6  0x00007f264356ff05 in ?? () from /usr/lib/libgnomescan.so.0
No symbol table info available.
#7  0x00007f26408a460e in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#8  0x00007f26408b9933 in ?? () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#9  0x00007f26408bace9 in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#10 0x00007f26408bb233 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#11 0x00007f2642bf1d46 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#12 0x00007f2642bf3009 in gtk_combo_box_set_active_iter ()
   from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#13 0x00007f2642bf30f8 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#14 0x00007f26408a460e in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#15 0x00007f26408b9933 in ?? () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#16 0x00007f26408bace9 in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#17 0x00007f26408bb233 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#18 0x00007f2642d8e45e in gtk_widget_activate ()
   from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#19 0x00007f2642c8f4ad in gtk_menu_shell_activate_item ()
   from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#20 0x00007f2642c90ca9 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#21 0x00007f2642c81488 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#22 0x00007f26408a460e in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#23 0x00007f26408b95fd in ?? () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#24 0x00007f26408bab7c in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#25 0x00007f26408bb233 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#26 0x00007f2642d8834f in ?? () from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#27 0x00007f2642c79b23 in gtk_propagate_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#28 0x00007f2642c7aaf3 in gtk_main_do_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#29 0x00007f26428efb5c in ?? () from /usr/lib/libgdk-x11-2.0.so.0
No symbol table info available.
#30 0x00007f26401cabbe in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#31 0x00007f26401ce588 in ?? () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#32 0x00007f26401ce9e5 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#33 0x00007f2642bffb45 in gtk_dialog_run () from /usr/lib/libgtk-x11-2.0.so.0
No symbol table info available.
#34 0x00007f264356a347 in gnome_scan_dialog_run ()
   from /usr/lib/libgnomescan.so.0
No symbol table info available.
#35 0x0000000000403543 in main ()
No symbol table info available.