From owner-freebsd-questions@FreeBSD.ORG  Wed Jun 18 17:21:07 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id AC164106567A
	for <freebsd-questions@freebsd.org>;
	Wed, 18 Jun 2008 17:21:07 +0000 (UTC)
	(envelope-from freebsd-questions@transip.nl)
Received: from relay0.transip.nl (relay0.transip.nl [80.69.67.21])
	by mx1.freebsd.org (Postfix) with ESMTP id 6B9468FC2D
	for <freebsd-questions@freebsd.org>;
	Wed, 18 Jun 2008 17:21:07 +0000 (UTC)
	(envelope-from freebsd-questions@transip.nl)
Received: from [192.168.0.3] (ip86-50-212-87.adsl2.versatel.nl [87.212.50.86])
	by relay0.transip.nl (Postfix) with ESMTP id E1E51103E17;
	Wed, 18 Jun 2008 19:21:03 +0200 (CEST)
Message-ID: <485943FC.5060807@transip.nl>
Date: Wed, 18 Jun 2008 19:21:00 +0200
From: Ali Niknam <freebsd-questions@transip.nl>
Organization: Transip BV
User-Agent: Thunderbird 2.0.0.14 (Windows/20080421)
MIME-Version: 1.0
To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
References: <4859197A.8040203@transip.nl>
	<20080618164345.B34431@wojtek.tensor.gdynia.pl>
In-Reply-To: <20080618164345.B34431@wojtek.tensor.gdynia.pl>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-questions@freebsd.org
Subject: Re: Sockets stuck in CLOSED state...
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 18 Jun 2008 17:21:07 -0000

Wojciech Puchar wrote:

 > #define socket TEST_SOCKET
<...>
 > and write one .c program where all these TEST_* functions are defined,
 > doing the same as  original PLUS logging to file.
 >
 > after a while (when you see this closed/unclosed connections) stop it
 > and look at logs.
 >

Thank you for the suggestions. I had considered that myself, however the 
server is doing about 300 DNS queries per second, so that's not easy to 
log. And even if it is logged you have sooo much information that it's 
nearly impossible to comprehend it.

The thing is that the problem does not occur always; the same ip can 
connect and do queries for thousands of times before 1 connection gets 
stuck.

To give you an idea: after about 24 hours (so that's about 26 million 
queries) I get about 10 stuck connections.

 > i'm almost sure you will notice where is a problem.
 > possibly threads implementation changed...


I can imagine; still, as far as I know, it should not be possible to be 
stuck in "CLOSED"...