@mawei It wasn't even BUG_ON, it would outright crash and oops... the maintainer said I was using the API wrong, but enforcing using it "right" by his definition without fixing this would require reimplementing half the logic in the scheduler outside of it just to duplicate its functionality enough to track and avoid the problem case. It's nuts. The problem could be easily fixed within the scheduler, it was just a non-intrusive change to one function to correctly handle a particular case.