Again I am no expert and these are just my thoughts, but from this dream I get a few things, first is that you are really terified of death and the things that happen afterward such as the decomposition and such,hence the bodies in states of decomposition, but for some reason you see no way to not face it, hence the walls. Along with this fear of death you have a fear of what will happen after it, also a fear of predators, hence the cannibalism to represent scavengers and other things and yet again the various states of decomposition. Personally I would have to say that you are being placed or forced into a position where you will have to see and deal with death, you see no way of getting out of the position, and along with this fear comes a fear of the unknown and such as shown by the cannibalism and skinny people, your sub concious is telling you that it really doesn't like being exposed to death and is completely afraid of it so it is trying to scare you away from it completely. As said at the start, I am no expert so I am only trying to interpet what I can just by feel.