Is General Relativity True?

If you believe general relativity is absolutely true, and you can construct an infinite i cylinder of dust, then you should believe this is physically possible. But we don't know if it's physically possible to do it. It might be that in that up date dversion that incorporates quanta mechanics, this doesn't work any more. This could be like, sort of, lik a singularity of a black hole,. Like a sign that the theory is wrong, because it predicts this sort of nonsense result. And also when people ask me some crazy question about special relativity involving spaceships and snowballs, whatever, i usually end up drawing like tones so i can understand what they're talking about.