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When you close asyncio socket server it closes all connection sockets, remove its readers and do "cancel" for readers. Problem is that, that after this reader tasks are leaved alone in "cancelling" state. They wouldn`t be really cancelled, because they need a loop step for that. But they are not in loop now(they suggest execution throught selector, but they not presented there after removal). Cancelling step woldn`t be done and tasks wouldn`t be really finished, and no finishing actions can be done.
I think that It is good idea such tasks to "ready" queue, so they can be executed in normal task way after removing from selector.