[Bug 250360] [tcp] connections should be closed if a same packet without FIN is received after FIN received

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250360

            Bug ID: 250360
           Summary: [tcp] connections should be closed if a same packet
                    without FIN is received after FIN received
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: yonghaoz1994 at gmail.com

The connection should be closed with the following packetdrill script

``
// Establish a connection.
0   socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0  setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0

+0  bind(3, ..., ...) = 0
+0  listen(3, 1) = 0

+0  < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
+0 ~ +1  > S. 0:0(0) ack 1 <...>

+.1 < . 1:1(0) ack 1 win 32792
+0  accept(3, ..., ...) = 4
+0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0

+0 < . 1:3962(3961) ack 1 win 28535
+0 < F. 3962:6683(2721) ack 1 win 45489

+0.1 read(4, ..., 177) =  177
+0.1 write(4, ..., 177) =  177
+0.1 write(4, ..., 113) =  113
+0 < . 3962:7468(3506) ack 1 win 29046
+0.1 write(4, ..., 113) =  -1 // current we got 113

```

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