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SubjectRe: rsync over ssh on 2.4.2 to 2.2.18

> netstat on isdn-gw shows the following:
> Proto Recv-Q Send-Q Local Address Foreign Address State
> tcp 72868 0 isdn-gw.piltdown.a:1023 ESTABLISHED
> select(4, [3], [3], NULL, NULL) = 2 (in [3], out [3])

> Maybe there is a race condition or missing wakeup in the TCP code?

Moreover, even not _one_ wakeup is missing. At least two, because
wakeups in read and write are separate and you have stuck in both directions.

Well, if it was one I would start to dig ground inside tcp instantly.
But as soon as two of them are missing, I have to suspect wake_up itself.
At least, we had such bugs there until 2.4.0.

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