Date: Mon, 12 May 2008 07:45:16 GMT From: John <yes298@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: amd64/123603: tcp_do_segment and Received duplicate SYN Message-ID: <200805120745.m4C7jGh7048924@www.freebsd.org> Resent-Message-ID: <200805120750.m4C7o1QN019328@freefall.freebsd.org>
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>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. >Fix: no idea . >Release-Note: >Audit-Trail: >Unformatted:
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