netdev - Re: TCP connection will hang in FIN_WAIT1 after closing if zero window is advertised

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Message-ID: <54183150.5030400@oktetlabs.ru>
Date:	Tue, 16 Sep 2014 16:47:12 +0400
From:	Andrey Dmitrov <andrey.dmitrov@...etlabs.ru>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
CC:	netdev@...r.kernel.org,
	"Alexandra N. Kossovsky" <Alexandra.Kossovsky@...etlabs.ru>,
	Konstantin Ushakov <kostik@...etlabs.ru>
Subject: Re: TCP connection will hang in FIN_WAIT1 after closing if zero window
 is advertised

On 16/09/14 03:15, Hannes Frederic Sowa wrote:
> Also thanks for the report.
>
> Do you see any tcp window repair messages in dmesg? Can you send some
> output of ss -oemit state FIN-WAIT-1 from the target host?
Hannes,
no, there aren't any messages in dmesg until net.ipv4.tcp_max_orphans is 
achieved.

# ss -oemit state FIN-WAIT-1
0 1 10.0.5.2:http 10.0.5.1:35973    timer:(persist,23sec,0) ino:0 
sk:ffff880226756140 ---
      skmem:(r0,rb374400,t0,tb46080,f4294966016,w1280,o0,bl0) cubic 
mss:536 cwnd:10 retrans:0/1 rcv_space:29200
0 1 10.0.5.2:http 10.0.5.1:35320    timer:(persist,26sec,0) ino:0 
sk:ffff88020b5cf180 ---
      skmem:(r0,rb374400,t0,tb46080,f4294966016,w1280,o0,bl0) cubic 
rto:2964 rtt:988/494 mss:536 cwnd:10 send 43.4Kbps rcv_space:29200
0 1 10.0.5.2:http 10.0.5.1:56784    timer:(persist,20sec,0) ino:0 
sk:ffff88022543e800 ---
      skmem:(r0,rb374400,t0,tb46080,f4294966016,w1280,o0,bl0) cubic 
rto:2964 rtt:988/494 mss:536 cwnd:10 send 43.4Kbps rcv_space:29200
0 1 10.0.5.2:http 10.0.5.1:45866    timer:(persist,22sec,0) ino:0 
sk:ffff88020b9d3140 ---
      skmem:(r0,rb374400,t0,tb46080,f4294966016,w1280,o0,bl0) cubic 
rto:2952 rtt:984/492 mss:536 cwnd:10 send 43.6Kbps rcv_space:29200

Thanks,
Andrey
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