From owner-freebsd-current@FreeBSD.ORG  Sun Nov  4 11:32:08 2012
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
 by hub.freebsd.org (Postfix) with ESMTP id CF503E52
 for <freebsd-current@freebsd.org>; Sun,  4 Nov 2012 11:32:08 +0000 (UTC)
 (envelope-from andre@freebsd.org)
Received: from c00l3r.networx.ch (c00l3r.networx.ch [62.48.2.2])
 by mx1.freebsd.org (Postfix) with ESMTP id 30C2D8FC0A
 for <freebsd-current@freebsd.org>; Sun,  4 Nov 2012 11:32:07 +0000 (UTC)
Received: (qmail 39000 invoked from network); 4 Nov 2012 13:07:57 -0000
Received: from c00l3r.networx.ch (HELO [127.0.0.1]) ([62.48.2.2])
 (envelope-sender <andre@freebsd.org>)
 by c00l3r.networx.ch (qmail-ldap-1.03) with SMTP
 for <null@pozo.com>; 4 Nov 2012 13:07:57 -0000
Message-ID: <50965236.6040009@freebsd.org>
Date: Sun, 04 Nov 2012 12:32:06 +0100
From: Andre Oppermann <andre@freebsd.org>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64;
 rv:16.0) Gecko/20121010 Thunderbird/16.0.1
MIME-Version: 1.0
To: Manfred Antar <null@pozo.com>
Subject: Re: weird network problems on current since 10/28/2012
References: <201211031740.qA3HeqVX001622@pozo.com>
 <CAJ-VmomAR8N8ovhC7La3ttG=7Qu_+VwD30tPxFBpzC37eg9CHA@mail.gmail.com>
 <201211040113.qA41DfLn001577@pozo.com>
In-Reply-To: <201211040113.qA41DfLn001577@pozo.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: Adrian Chadd <adrian@freebsd.org>, freebsd-current@freebsd.org
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 04 Nov 2012 11:32:09 -0000

On 04.11.2012 02:13, Manfred Antar wrote:
> At 03:29 PM 11/3/2012, Adrian Chadd wrote:
>> On 3 November 2012 10:40, Manfred Antar <null@pozo.com> wrote:
>>> i have problem connecting to freebsd box on local network since last sunday.
>>> the last kernel that works:
>>>   FreeBSD 10.0-CURRENT #0: Sun Oct 28 12:14:38 PDT 2012
>>> anything after that, sometimes i can connect, other times just hangs.
>>> any network connection hangs ===== pop httpd ssh etc etc.
>>> anyone have any ideas ?
>>> i can checkout different sources and see if i can locate the changes that cause this.
>>
>> Please do!
>>
>>
>>
>> adrian
>
> OK
> Here is what I found doing :
> setenv CVSROOT /usr/home/ncvs
>
> cvs co -D"October 28, 2012 12:14:38 PDT" sys
>
> A kernel from that time works fine.
>
> doing:
>
> cvs up -D"October 28, 2012 13:14:38 PDT" sys                    1 hour later
> the following files were changed:
> sys/netinet/tcp_input.c
> sys/netinet/tcp_timer.c
> sys/netinet/tcp_var.h
>
> Building a kernel from these new files is when the problem starts.

Can you please provide one or more tcpdump from a failing kernel?
Also please enable sysctl net.inet.tcp.logdebug=1 and capture LOG_DEBUG
output from syslogd.  That may give some important information as well.

-- 
Andre