accept: Bad address

[Ilguiz Latypov via cygwin]

Hello,

The latest Cygwin 64-bit release with the snapshot cygwin1.dll copied on top of it shows an "accept: Bad address error" in 3 reproducible cases:

(a) The sshd daemon on receiving a connection request.
(b) The XWin server on receiving a connection request from an X11 client such as xterm.
(c) The Python server receiving a TCP connection in the socket's accept().

A StackOverflow question 41018644 from December 2016 showed an example of the bug with the Python server (c).

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