I really have no idea. If it crashed, then I'd have a clue, but since it was still running, the only thing that makes any sense is that it's going in an endless loop reiterating over things. The only thing I can think of is that there's a loop on symlinks or something where it just keeps going back and forth. I'll try and replicate, but if I can't, then there's not going to be much I'd be able to do.