netdev - sockets staying in FIN-WAIT-1, CLOSING, or LAST-ACK state till reboot

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Date:   Sun, 15 May 2022 17:04:32 +0300
From:   Sami Farin <hvtaifwkbgefbaei@...il.com>
To:     Linux Networking Mailing List <netdev@...r.kernel.org>
Subject: sockets staying in FIN-WAIT-1, CLOSING, or LAST-ACK state till reboot

Hello,

with 5.15.37, ss -K -t does not properly kill the TCP sockets.
[ Disclaimer: this is my guess of the culprit.  I also use wireguard. ]

tcp          FIN-WAIT-1        0             1                                               80.220.8.55:22384                   91.198.174.208:443             ino:0 sk:510b cgroup:unreachable:6c46 ---
	 skmem:(r0,rb87380,t0,tb130560,f0,w0,o0,bl0,d0) ts sack ecn ecnseen bbr wscale:9,10 rto:3744 rtt:33.364/18.714 ato:40 mss:36 pmtu:68 rcvmss:536 advmss:1448 cwnd:1 bytes_sent:701 bytes_acked:702 bytes_received:254 segs_out:6 segs_in:3 data_segs_out:2 data_segs_in:1 bbr:(bw:10176bps,mrtt:27.924,pacing_gain:2.88672,cwnd_gain:2.88672) send 8632bps lastsnd:601107881 lastrcv:601107884 lastack:601107810 pacing_rate 11658680bps delivery_rate 10192bps delivered:3 app_limited busy:23371222ms lost:1 rcv_space:14480 rcv_ssthresh:42242 minrtt:27.924

$ nc -l -p 22384
Ncat: bind to 0.0.0.0:22384: Address already in use. QUITTING.
$ nc -l 127.0.0.1 22384
^C
$

These zombie sockets all have Send-Q > 0.

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