Date: Fri, 21 Aug 2009 20:40:22 GMT From: "H. Steuer" <steuer@patronas.de> To: freebsd-gnats-submit@FreeBSD.org Subject: i386/138046: tcp sockets stay in SYN_SENT even after receiving RST. never time out as well. Message-ID: <200908212040.n7LKeM7B052296@www.freebsd.org> Resent-Message-ID: <200908212050.n7LKo5Sj072226@freefall.freebsd.org>
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>Number: 138046 >Category: i386 >Synopsis: tcp sockets stay in SYN_SENT even after receiving RST. never time out as well. >Confidential: no >Severity: critical >Priority: high >Responsible: freebsd-i386 >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Aug 21 20:50:04 UTC 2009 >Closed-Date: >Last-Modified: >Originator: H. Steuer >Release: 7.1, 7.2, 8.0-BETA2 of august 2 >Organization: >Environment: FreeBSD xxxx 7.2-RELEASE-p3 FreeBSD 7.2-RELEASE-p3 #3: Tue Aug 18 22:50:46 CEST 2009 root@xxxxx:/usr/obj/usr/src/sys/DL380G5 i386 FreeBSD xxxxxx 7.1-RELEASE-p4 FreeBSD 7.1-RELEASE-p4 #1: Sat Apr 11 22:55:52 CEST 2009 root@xxxxx:/usr/obj/usr/src/sys/DL380G5 i386 FreeBSD edinburgh 8.0-BETA2 FreeBSD 8.0-BETA2 #1: Sun Aug 2 21:16:35 CEST 2009 pieter@edinburgh:/usr/obj/usr/src/sys/GENERIC-nodbg i386 >Description: when a tcp connection is made to a existing host but a non-listening port, the tcp connection will stay in state SYN_SENT and will never be closed unless the process gets killed. tcpdump shows a SYN packet answered by a RST. so the RST should close the socket. the second problem is that at least the socket should time out in some way which isnt the case either. i have written a small tcp client that you can download at http://skywalker.patronas.de/tcpclient.c it connects 50 times, so after running that app, you will see 50 sockets in SYN_ACK state. >How-To-Repeat: download http://skywalker.patronas.de/tcpclient.c compile run against exisiting host and non-listening port while the process is alive, netstat -an | grep [port] >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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