From owner-freebsd-current@FreeBSD.ORG  Tue Jul 13 13:05:21 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id E150916A4CE; Tue, 13 Jul 2004 13:05:21 +0000 (GMT)
Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 89D0743D39; Tue, 13 Jul 2004 13:05:21 +0000 (GMT)
	(envelope-from gallatin@cs.duke.edu)
Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu
	[152.3.145.30])
	by duke.cs.duke.edu (8.12.10/8.12.10) with ESMTP id i6DD5LWg025257
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Tue, 13 Jul 2004 09:05:21 -0400 (EDT)
Received: (from gallatin@localhost)
	by grasshopper.cs.duke.edu (8.12.9p2/8.12.9/Submit) id i6DD5G65030788;
	Tue, 13 Jul 2004 09:05:16 -0400 (EDT)
	(envelope-from gallatin)
From: Andrew Gallatin <gallatin@cs.duke.edu>
Message-ID: <16627.56844.22088.901721@grasshopper.cs.duke.edu>
Date: Tue, 13 Jul 2004 09:05:16 -0400 (EDT)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
To: Gary Stanley <gary@outloud.org>
In-Reply-To: <6.1.2.0.2.20040712142407.02d38a98@64.124.166.215>
References: <6.1.2.0.2.20040712142407.02d38a98@64.124.166.215>
X-Mailer: VM 6.75 under 21.1 (patch 12) "Channel Islands" XEmacs Lucid
cc: alc@freebsd.org
cc: freebsd-current@freebsd.org
Subject: sendfile problem (Re: Network related procs hang in unusual sfpbsy
	state)
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/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: Tue, 13 Jul 2004 13:05:22 -0000


Gary Stanley writes:
 > New current kernel from about 3 days ago, certain processes hang after 
 > about a day in this state;
 > 
 >     80   599     1   0 -16 -2 59020 53548 sfpbsy D<    ??  1141:08.65 
 > /mnt/zeus/web/bin/zeus.web

This means that the webserver was trying to send a file via
sendfile(), it encountered a busy page, and went to sleep waiting for
that page to be not-busy.  But nothing ever woke it up...

You might be able to work around this temporarily by disabling
sendfile on your web server.  But its something which needs to be
fixed.

It would be interesting to look at the page in question to see if its
still busy.  Do you have a gdb which can do kernel debugging?
(apparently ports/dev/gdb53 can..)

Drew