I conclude this is a gtk memory leak. It occurs when calling
gtk_combo_box_new_with_entry(), Apparently, when the dialog that contains
the combo box is destroyed, the GList "visible_children" in file
gtkcombobox.c is not being cleansed of the pointer to the child widget,
entry. The leak does not occur if plain gtk_combo_box_new() is used
instead. Correct me if I'm wrong.

Here's a valgrind suppression entry:
{
   libgtk:comboboxwithentry
   Memcheck:Leak
   fun:malloc
   fun:g_malloc
   fun:g_slice_alloc
   fun:g_list_prepend
   fun:gtk_combo_box_get_path_for_child
   fun:gtk_widget_get_path
   fun:reset_style_recurse
   fun:gtk_widget_set_parent
   fun:gtk_combo_box_add
   fun:g_closure_invoke
}

2013/1/22 Edscott Wilson <edscott.wilson.gar...@gmail.com>

>
> Would the following be a leak in the gtk library (which I should not worry
> about), or a leak in my program ( http://xffm.org )?
>
>
> ==19528==
> ==19528== 24 bytes in 1 blocks are definitely lost in loss record 2,773 of
> 9,919
> ==19528==    at 0x4C2AABB: malloc (in
> /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==19528==    by 0x8993114: g_malloc (in /usr/lib64/libglib-2.0.so.0.3000.2)
> ==19528==    by 0x89A8069: g_slice_alloc (in
> /usr/lib64/libglib-2.0.so.0.3000.2)
> ==19528==    by 0x8986F8D: g_list_prepend (in
> /usr/lib64/libglib-2.0.so.0.3000.2)
> ==19528==    by 0x5EF1E9A: gtk_combo_box_get_path_for_child (in
> /usr/lib64/libgtk-3.so.0.200.4)
> ==19528==    by 0x60AC65B: gtk_widget_get_path (in
> /usr/lib64/libgtk-3.so.0.200.4)
> ==19528==    by 0x60AC6F9: reset_style_recurse (in
> /usr/lib64/libgtk-3.so.0.200.4)
> ==19528==    by 0x60B8276: gtk_widget_set_parent (in
> /usr/lib64/libgtk-3.so.0.200.4)
> ==19528==    by 0x5EF1F83: gtk_combo_box_add (in
> /usr/lib64/libgtk-3.so.0.200.4)
> ==19528==    by 0x8300C63: g_closure_invoke (in
> /usr/lib64/libgobject-2.0.so.0.3000.2)
> ==19528==    by 0x83173A6: ??? (in /usr/lib64/libgobject-2.0.so.0.3000.2)
> ==19528==    by 0x8318DE8: g_signal_emit_valist (in
> /usr/lib64/libgobject-2.0.so.0.3000.2)
>
> Gtk version: GTK+-3.2.4
>
> Linux tauro 3.2.1-gentoo-r2 #3 SMP Tue Oct 16 09:47:16 CDT 2012 x86_64
> Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz GenuineIntel GNU/Linux
>
> Any clues will be kindly appreciated.
>
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