Game stuck doing "do_wait" system calls indefinitely, hogging an entire cpu

I tried to close the game, and it's currently (I still haven't forced it to quit in the hopes I can debug what's going on) hogging my entire cpu doing exclusively a "do_wait" system call (according to proc). About half an hour ago, maybe ten minutes after I'd told the game to quit, the game process was in an uninterruptible sleep state, which apparently is usually a wait for io or similar. Now it's in a regular sleep state and taking one entire cpu. Data collection on this one is going to be tricky.