[Bug 217637] One TCP connection accepted TWO times

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

--- Comment #83 from commit-hook at freebsd.org ---
A commit references this bug:

Author: tuexen
Date: Thu Jun  1 08:32:35 UTC 2017
New revision: 319400
URL: https://svnweb.freebsd.org/changeset/base/319400

Log:
  MFC r317208:

  Syncoockies can be used in combination with the syncache. If the cache
  overflows, syncookies are used.
  This patch restricts the usage of syncookies in this case: accept
  syncookies only if there was an overflow of the syncache recently.
  This mitigates a problem reported in PR217637, where is syncookie was
  accepted without any recent drops.
  Thanks to glebius@ for suggesting an improvement.

  PR:                   217637
  Reviewed by:          gnn, glebius
  Differential Revision:        https://reviews.freebsd.org/D10272

Changes:
_U  stable/11/
  stable/11/sys/netinet/tcp_syncache.c
  stable/11/sys/netinet/tcp_syncache.h

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