As far as I am aware (which isn't very far), that smell/bacteria in a full mash should be overtaken by the yeast which has been added...that should be more powerful and takeover other bacteria (I think)...but in saying that, I'm unfamiliar if it means throw it out. I certainly wouldn't. If there's still sugars left, maybe some fresh distiller's yeast. Otherwise, maybe just run it and see...I can imagine it would be quite 'butery', but can be a desired flavour/character blended in and aged long term
