From time to time our Linux 2.6 kernel generates the following message:
TCP: Peer 188.8.131.52:64259/51542 unexpectedly shrunk window \ 4197231805:4197240525 (repaired)It was a bit scarier back then when it read something like this:
TCP: Treason uncloaked! Peer 184.108.40.206:64259/51542 shrinks window \ 3166327388:3166327393. Repaired.The message has been modified in December 2008. While there are quite a lot of posts and articles on this topic, a pretty good explanation can be found in commit 2ad4106:
Clear stale pred_flags when snd_wnd changes.