Apparent memory leak of spawned tasks about mini-redis HOT 6 CLOSED

I have been running the reproduction using the PR linked above and memory is stable for me.

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If you modify Tokio to print when Arc<WaitNode> is created and dropped inside broadcast, you will see that it creates one for every connection, but none of them are dropped until the application closes.

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Thanks for the report. I will try to look later today. My guess, w/o looking, is that it is a similar problem as the old semaphore had. If that is a case, it will need a similar rework as tokio-rs/tokio#2325

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@carllerche do you think broadcast can easily be modified to use the semaphore?

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Open PR here: tokio-rs/tokio#2509

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Fixed w/ the tokio release.

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