If the same pointers are freed twice by eina_mempool_free, newly created pointers by eina_mempool_malloc are always same.
Because eina_mempool uses eina_trash_push and eina_trash_pop.
I attached sample code.
Actually, problem case is that the same ecore_idler is deleted twice by user fault.
In this case, we can defend using efl_event_callback_array_del's return value.
I wonder if there is way to solve this problem at eina_mempool side.
void *
_ecore_factorized_idle_del(Ecore_Idler *idler)
{
...
Eina_Bool ret = efl_event_callback_array_del(_mainloop_singleton, idler->desc, idler);
if (!ret) return idler->data;
data = idler->data;
eina_mempool_free(idler_mp, idler);
return data;
}