[Bug 252913] [tcp] Using RACK leaks mbufs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252913

--- Comment #17 from iron.udjin at gmail.com ---
Today I discovered another issue. Some of TCP sessions looping in TCP
Retransmission state. Here is what I captured by tcpdump and dumped by tshark:

31880  32.587768 XXX.XXX.XXX.XXX → YYY.YYY.YYY.YYY TCP 1514 [TCP
Retransmission] 443 → 56467 [ACK] Seq=1 Ack=1 Win=17 Len=1460
31881  32.588789 XXX.XXX.XXX.XXX → YYY.YYY.YYY.YYY TCP 1514 [TCP
Retransmission] 443 → 56467 [ACK] Seq=1 Ack=1 Win=17 Len=1460
31882  32.589809 XXX.XXX.XXX.XXX → YYY.YYY.YYY.YYY TCP 1514 [TCP
Retransmission] 443 → 56467 [ACK] Seq=1 Ack=1 Win=17 Len=1460
31883  32.590829 XXX.XXX.XXX.XXX → YYY.YYY.YYY.YYY TCP 1514 [TCP
Retransmission] 443 → 56467 [ACK] Seq=1 Ack=1 Win=17 Len=1460
31884  32.591849 XXX.XXX.XXX.XXX → YYY.YYY.YYY.YYY TCP 1514 [TCP
Retransmission] 443 → 56467 [ACK] Seq=1 Ack=1 Win=17 Len=1460
31885  32.592870 XXX.XXX.XXX.XXX → YYY.YYY.YYY.YYY TCP 1514 [TCP
Retransmission] 443 → 56467 [ACK] Seq=1 Ack=1 Win=17 Len=1460
31886  32.593891 XXX.XXX.XXX.XXX → YYY.YYY.YYY.YYY TCP 1514 [TCP
Retransmission] 443 → 56467 [ACK] Seq=1 Ack=1 Win=17 Len=1460
31887  32.594911 XXX.XXX.XXX.XXX → YYY.YYY.YYY.YYY TCP 1514 [TCP
Retransmission] 443 → 56467 [ACK] Seq=1 Ack=1 Win=17 Len=1460
31888  32.595931 XXX.XXX.XXX.XXX → YYY.YYY.YYY.YYY TCP 1514 [TCP
Retransmission] 443 → 56467 [ACK] Seq=1 Ack=1 Win=17 Len=1460

XXX.XXX.XXX.XXX - my IP
YYY.YYY.YYY.YYY - client IP

Those TCP sessions produce 10-100Mbit traffic from my server to clients. Please
check attached screenshot.

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