I rebuilt and installed a bunch of -dbg packages and got a somewhat
better stack trace:
#0  0xb7493490 in *__GI_strcpy (dest=0x820df98 "\bDV\267\bDV\267", src=0x0)
    at strcpy.c:39
#1  0xb674be0b in getvalue (handle=0x81c7800, option=38, 
    action=SANE_ACTION_GET_VALUE, value=0x820df98, info=0x0) at epson2.c:2519
#2  sane_epson2_control_option (handle=0x81c7800, option=38, 
    action=SANE_ACTION_GET_VALUE, value=0x820df98, info=0x0) at epson2.c:2921
#3  0xb7fbe30d in sane_dll_control_option (handle=0x811e998, option=38, 
    action=SANE_ACTION_GET_VALUE, value=0x820df98, info=0x0) at dll.c:1224
#4  0xb7fbca39 in sane_control_option (h=0x811e998, opt=38, 
    act=SANE_ACTION_GET_VALUE, val=0x820df98, info=0x0) at dll-s.c:36
#5  0x08053ff9 in xsane_control_option (handle=0x811e998, option=38, 
    action=SANE_ACTION_GET_VALUE, val=0x820df98, info=0x0)
    at xsane-back-gtk.c:194
#6  0x080c384c in xsane_panel_build () at xsane.c:4760
#7  0x080c7720 in xsane_device_dialog () at xsane.c:5291
#8  0xb7725544 in IA__g_cclosure_marshal_VOID__VOID (closure=0x819e0f8, 
    return_value=0x0, n_param_values=1, param_values=0x81a15c8, 
    invocation_hint=0xbfffe2dc, marshal_data=0x80c87a0)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gmarshal.c:77
#9  0xb7717de3 in IA__g_closure_invoke (closure=0x819e0f8, return_value=0x0, 
    n_param_values=1, param_values=0x81a15c8, invocation_hint=0xbfffe2dc)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gclosure.c:767
#10 0xb772bf0f in signal_emit_unlocked_R (node=0x819d950, detail=0, 
    instance=0x8162908, emission_return=0x0, instance_and_params=0x81a15c8)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gsignal.c:3247
#11 0xb772d359 in IA__g_signal_emit_valist (instance=0x8162908, signal_id=100, 
    detail=0, 
    var_args=0xbfffe47c 
"\230\226t\267\230\226t\267\b)\026\b\250\344\377\277H\276\255\267\b)\026\b")
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gsignal.c:2980
#12 0xb772d7b6 in IA__g_signal_emit (instance=0x8162908, signal_id=100, 
    detail=0)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gsignal.c:3037
#13 0xb7ada82a in IA__gtk_button_clicked (button=0x8162908)
    at /tmp/buildd/gtk+2.0-2.18.5/gtk/gtkbutton.c:1111
#14 0xb7adbe48 in gtk_real_button_released (button=0x8162908)
    at /tmp/buildd/gtk+2.0-2.18.5/gtk/gtkbutton.c:1707
#15 0xb7725544 in IA__g_cclosure_marshal_VOID__VOID (closure=0x819d8e0,     
return_value=0x0, n_param_values=1, param_values=0x81a1600, 
    invocation_hint=0xbfffe65c, marshal_data=0xb7adbe00)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gmarshal.c:77
#16 0xb7716569 in g_type_class_meta_marshal (closure=0x819d8e0, 
    return_value=0x0, n_param_values=1, param_values=0x81a1600, 
    invocation_hint=0xbfffe65c, marshal_data=0x1a4)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gclosure.c:878
#17 0xb7717de3 in IA__g_closure_invoke (closure=0x819d8e0, return_value=0x0, 
    n_param_values=1, param_values=0x81a1600, invocation_hint=0xbfffe65c)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gclosure.c:767
#18 0xb772b778 in signal_emit_unlocked_R (node=0x819d920, detail=0, 
    instance=0x8162908, emission_return=0x0, instance_and_params=0x81a1600)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gsignal.c:3177
#19 0xb772d359 in IA__g_signal_emit_valist (instance=0x8162908, signal_id=99, 
    detail=0, 
    var_args=0xbfffe7fc 
"\230\226t\267\244\212\341\267\020\352\377\277(\350\377\277\003\251\255\267\b)\026\b")
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gsignal.c:2980
#20 0xb772d7b6 in IA__g_signal_emit (instance=0x8162908, signal_id=99,     
detail=0)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gsignal.c:3037
#21 0xb7ada8ca in IA__gtk_button_released (button=0x8162908)
    at /tmp/buildd/gtk+2.0-2.18.5/gtk/gtkbutton.c:1103
#22 0xb7ada903 in gtk_button_button_release (widget=0x8162908, event=0x810a9a0)
    at /tmp/buildd/gtk+2.0-2.18.5/gtk/gtkbutton.c:1599
#23 0xb7b9a194 in _gtk_marshal_BOOLEAN__BOXED (closure=0x8115af8, 
    return_value=0xbfffea10, n_param_values=2, param_values=0x813bdb8, 
    invocation_hint=0xbfffe9fc, marshal_data=0xb7ada8e0)
    at /tmp/buildd/gtk+2.0-2.18.5/gtk/gtkmarshalers.c:84
#24 0xb7716569 in g_type_class_meta_marshal (closure=0x8115af8, 
    return_value=0xbfffea10, n_param_values=2, param_values=0x813bdb8, 
    invocation_hint=0xbfffe9fc, marshal_data=0xb4)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gclosure.c:878
#25 0xb7717de3 in IA__g_closure_invoke (closure=0x8115af8, 
    return_value=0xbfffea10, n_param_values=2, param_values=0x813bdb8, 
    invocation_hint=0xbfffe9fc)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gclosure.c:767
#26 0xb772bbb7 in signal_emit_unlocked_R (node=0x8115be0, detail=0, 
    instance=0x8162908, emission_return=0xbfffeb48, 
    instance_and_params=0x813bdb8)    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gsignal.c:3285
#27 0xb772d1ef in IA__g_signal_emit_valist (instance=0x8162908, signal_id=34, 
    detail=0, var_args=0xbfffeba0 "\334\353\377\277\210\233\020\b")
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gsignal.c:2990
#28 0xb772d7b6 in IA__g_signal_emit (instance=0x8162908, signal_id=34, 
    detail=0)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/gobject/gsignal.c:3037
#29 0xb7cb62fe in gtk_widget_event_internal (widget=<value optimized out>, 
    event=0x810a9a0) at /tmp/buildd/gtk+2.0-2.18.5/gtk/gtkwidget.c:4767
#30 0xb7b92940 in IA__gtk_propagate_event (widget=0x8162908, event=0x810a9a0)
    at /tmp/buildd/gtk+2.0-2.18.5/gtk/gtkmain.c:2417
#31 0xb7b93bc9 in IA__gtk_main_do_event (event=0x810a9a0)
    at /tmp/buildd/gtk+2.0-2.18.5/gtk/gtkmain.c:1622
#32 0xb7a1d42a in gdk_event_dispatch (source=0x810efa0, callback=0, 
    user_data=0x0) at /tmp/buildd/gtk+2.0-2.18.5/gdk/x11/gdkevents-x11.c:2372
#33 0xb768bf28 in g_main_dispatch (context=0x80e80d8)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/glib/gmain.c:1960
#34 IA__g_main_context_dispatch (context=0x80e80d8)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/glib/gmain.c:2513#35 
0xb768f6b3 in g_main_context_iterate (context=0x80e80d8, block=1, 
    dispatch=1, self=0x813a828)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/glib/gmain.c:2591
#36 0xb768fb7a in IA__g_main_loop_run (loop=0x81bdbc8)
    at 
/build/buildd-glib2.0_2.22.3-1-i386-Y6yR35/glib2.0-2.22.3/glib/gmain.c:2799
#37 0xb7b94139 in IA__gtk_main ()
    at /tmp/buildd/gtk+2.0-2.18.5/gtk/gtkmain.c:1218
#38 0x080c8053 in xsane_interface (argc=1, argv=0xbffff4c4) at xsane.c:6025
#39 0x080c86a2 in main (argc=1, argv=0xbffff4c4) at xsane.c:6218


-- 

..ooOO ch...@chiappa.net              | My opinions are my own  OOoo..
..ooOO chris.chia...@oracle.com       | and certainly not those OOoo..
..ooOO http://www.chiappa.net/~chris/ | of my employer          OOoo..



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