find_common_ancestors(src, dst, &common_ancestor, &src_ancestor, &dst_ancestor);
XBT_DEBUG("elements_father: common ancestor '%s' src ancestor '%s' dst ancestor '%s'", common_ancestor->name(),
src_ancestor->name(), dst_ancestor->name());
find_common_ancestors(src, dst, &common_ancestor, &src_ancestor, &dst_ancestor);
XBT_DEBUG("elements_father: common ancestor '%s' src ancestor '%s' dst ancestor '%s'", common_ancestor->name(),
src_ancestor->name(), dst_ancestor->name());