Okay, looks like withoutboats gave the answer to this in another thread [1], and that seems like the right answer. The accept() future being dropped must not result in any cancellation of any kind, unless the listener itself is also dropped.

This is an implementation issue with monoio that just needs more polishing. And given how hard io_uring is to get right, monoio should be given that time before being chosen to be used in production for anything.

[1] https://news.ycombinator.com/item?id=41994308