I was running E in Xephyr, trapping on eo.c:637. Popup a slider (from either mixer or backlight gadgets), and crash. I can get you an entire gdb bt if you want (but that will have to wait until after lunch)
Nah, its okay, i just was wondering what the heck happened here that the resize_obj is NULL, this means that this function has to be executed before the group_add of the layout is called, it feels to me that we are missing something else there ... Let me take there a close look tomorrow or so.
This occurs during object deletion: according to the backtrace from when this object is NULL here, _elm_slider_efl_object_destructor() calls efl_ui_format_cb_set() and the internal objects are destroyed. I think the correct fix would be to add if (efl_invalidated_get(obj)) return; before L1048 instead to avoid triggering any of this code.