[Bug 217637] One TCP connection accepted TWO times

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217637

--- Comment #73 from Sepherosa Ziehau <sepherosa at gmail.com> ---
(In reply to Michael Tuexen from comment #72)

IMO, transition from {FIN-WAIT-1,FIN-WAIT-2,CLOSING} to TIME_WAIT instead of
CLOSED upon receiving data from a closed socket can partially cover this case
by leveraging the 2MSL waiting, i.e. keep sending RST.  Once 2MSL is done,
syncookie kicks in, which is unfixable.

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