[Bug 265064] connect(2): unexpected EADDRINUSE when connecting from IPv6 wildcard to IPv4 address

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 24 Jul 2022 22:12:12 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265064

Mike Karels <karels@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |karels@freebsd.org

--- Comment #2 from Mike Karels <karels@freebsd.org> ---
The problem is that the bind() for the failing socket should not have
succeeded, and the problem isn't discovered until the connect().  The root
problem is that bind on an IPv6 socket is allowed to choose a port that is
already bound by a previous socket, but which has been connected and hence
turned into an IPv4 socket.  The connect cannot succeed then, because it would
create a fully duplicate session (4-tuple).

I am looking at a fix for the bind, but it is somewhat messy.

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