Date: Mon, 19 May 2008 15:10:02 GMT From: John Baldwin <jhb@freebsd.org> To: freebsd-net@FreeBSD.org Subject: Re: amd64/123603: tcp_do_segment and Received duplicate SYN Message-ID: <200805191510.m4JFA2vP035587@freefall.freebsd.org>
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The following reply was made to PR kern/123603; it has been noted by GNATS. From: John Baldwin <jhb@freebsd.org> To: freebsd-amd64@freebsd.org Cc: John <yes298@gmail.com>, freebsd-gnats-submit@freebsd.org, andre@FreeBSD.org Subject: Re: amd64/123603: tcp_do_segment and Received duplicate SYN Date: Mon, 19 May 2008 10:06:40 -0400 On Monday 12 May 2008 03:45:16 am John wrote: > >Number: 123603 > >Category: amd64 > >Synopsis: tcp_do_segment and Received duplicate SYN > >Confidential: no > >Severity: critical > >Priority: high > >Responsible: freebsd-amd64 > >State: open > >Quarter: > >Keywords: > >Date-Required: > >Class: sw-bug > >Submitter-Id: current-users > >Arrival-Date: Mon May 12 07:50:01 UTC 2008 > >Closed-Date: > >Last-Modified: > >Originator: John > >Release: FB7.0 (x64) > >Organization: > > NULL > > >Environment: > > FreeBSD mail.mydomain.com 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Thu Mar 6 > 12:04:57 HKT 2008 root@mydomain.com:/usr/src/sys/amd64/compile/FB7NEW > amd64 > > >Description: > > A FreeBSD 7.0 (x64) Lighttpd Web Server with most-updated ports and patchs. > when a client connect and view a static HTML file, At the first time > (before web server idle time), it needs to wait a long time to establish a > connection, OR when this server try to download file from Internet, there > are lots of logs messages just like below: > > May 12 11:57:54 mail kernel: TCP: [55.66.77.88]:41792 to [11.22.33.44]:80 > tcpflags 0x2<SYN>; syncache_add: Received duplicate SYN, resetting timer > and retransmitting SYN|ACK > May 12 15:17:53 mail kernel: TCP: [193.166.3.2]:45979 to > [11.22.33.44]:63372 tcpflags 0x10<ACK>; tcp_do_segment: FIN_WAIT_1: > Received 1448 bytes of data after socket was closed, sending RST and > removing tcpcb May 12 15:17:53 mail kernel: TCP: [193.166.3.2]:21 to > [11.22.33.44]:55007 tcpflags 0x18<PUSH,ACK>; tcp_do_segment: FIN_WAIT_2: > Received 13 bytes of data after socket was closed, sending RST and removing > tcpcb > > >How-To-Repeat: > > any type of connection will generate above log messages. You can either comment out all the log(LOG_DEBUG, ...) calls in /sys/netinet/tcp*.c or change your /etc/syslog.conf to not send kern.debug messages to the console. I think these messages should probably be conditional on a kernel option FWIW. -- John Baldwin
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