netdev - why tcp retrancimission continue after FIN flag received?

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Message-ID: <CAMRd1sV1g9wMc1aSgkcCHV+tb_T3Yr-q1XCXoT2XrACLDrY69w@mail.gmail.com>
Date:	Thu, 15 May 2014 11:52:55 +0800
From:	Chptx Young <chptxy@...il.com>
To:	Linux Netdev List <netdev@...r.kernel.org>
Subject: why tcp retrancimission continue after FIN flag received?

hello,
      these packtes were captured with tcpdump on Android/linux
3.4.39/10.180.43.211, linux
tries retransimissin (packet #35 ) after FIN (#32), any problem here?

     No.     Time        Source                Destination
Protocol Length  Info
     26 17.657176   10.180.43.211         10.0.0.172            TCP
  1466   [TCP segment of a reassembled PDU]
     27 37.630979   10.180.43.211         10.0.0.172            TCP
  1466   [TCP Retransmission] [TCP segment of a reassembled PDU]
     28 40.876444   10.0.0.172            10.180.43.211         TCP
  56     http > 32921 [ACK] Seq=1 Ack=8687 Win=22560 Len=0
     29 40.877060   10.180.43.211         10.0.0.172            TCP
  1466   [TCP segment of a reassembled PDU]
     30 40.877248   10.180.43.211         10.0.0.172            TCP
  1466   [TCP segment of a reassembled PDU]
     31 80.830941   10.180.43.211         10.0.0.172            TCP
  1466   [TCP Retransmission] [TCP segment of a reassembled PDU]
     32 82.723420   10.0.0.172            10.180.43.211         TCP
  56     http > 32921 [FIN, ACK] Seq=1 Ack=8687 Win=22560 Len=0
     33 82.725760   10.180.43.211         10.0.0.172            TCP
  56     32921 > http [ACK] Seq=15737 Ack=2 Win=14600 Len=0
     34 83.536384   10.0.0.172            10.180.43.211         TCP
  56     http > 32921 [RST] Seq=1 Win=0 Len=0
     35 160.831079  10.180.43.211         10.0.0.172            TCP
  1466   [TCP Retransmission] [TCP segment of a reassembled PDU]
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