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Date:      Fri, 17 Mar 2017 01:42:44 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-net@FreeBSD.org
Subject:   [Bug 217637] One TCP connection accepted TWO times
Message-ID:  <bug-217637-2472-iZK21SOHKQ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-217637-2472@https.bugs.freebsd.org/bugzilla/>
References:  <bug-217637-2472@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D217637

--- Comment #21 from Sepherosa Ziehau <sepherosa@gmail.com> ---
(In reply to Michael Tuexen from comment #18)

Hmm, do any OS's TCP stacks really send data along w/ the last ACK in the 3=
-way
handshake at all?

And if we are checking the syncookie, it indicates we suffered short-of-mem=
ory
previously.  I don't think we need to record that situation.

Let me rephrase my original suggestion (I am not a native speaker, sorry):
Drop the last ACK w/ data, before syncookie is going to be checked.

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