Post #1978211

After 5 hours, found the problem. I have a function which creates a generator and returns a generator, like: def f(filename): it = g(filename) def process_it(): for value in it: yield value*2 return process_it() I needed def process_it(): try: for value in it: yield value*2 finally: it.close() I used traceback.print_stack() to help figure out if I was in a normal close() or in gc close, since it's a few levels deep.