From owner-freebsd-current@FreeBSD.ORG Sun Oct 15 18:10:16 2006 Return-Path: X-Original-To: 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 C7DA716A403 for ; Sun, 15 Oct 2006 18:10:16 +0000 (UTC) (envelope-from pho@holm.cc) Received: from relay03.pair.com (relay03.pair.com [209.68.5.17]) by mx1.FreeBSD.org (Postfix) with SMTP id 1BED743D45 for ; Sun, 15 Oct 2006 18:10:15 +0000 (GMT) (envelope-from pho@holm.cc) Received: (qmail 6715 invoked from network); 15 Oct 2006 18:10:14 -0000 Received: from unknown (HELO peter.osted.lan) (unknown) by unknown with SMTP; 15 Oct 2006 18:10:14 -0000 X-pair-Authenticated: 80.165.155.106 Received: from peter.osted.lan (localhost.osted.lan [127.0.0.1]) by peter.osted.lan (8.13.6/8.13.6) with ESMTP id k9FIADX2051943; Sun, 15 Oct 2006 20:10:13 +0200 (CEST) (envelope-from pho@peter.osted.lan) Received: (from pho@localhost) by peter.osted.lan (8.13.6/8.13.6/Submit) id k9FIADE1051942; Sun, 15 Oct 2006 20:10:13 +0200 (CEST) (envelope-from pho) Date: Sun, 15 Oct 2006 20:10:13 +0200 From: Peter Holm To: Kris Kennaway Message-ID: <20061015181013.GA51886@peter.osted.lan> References: <20061015083511.GA13203@shark.localdomain> <20061015171152.GA68129@xor.obsecurity.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20061015171152.GA68129@xor.obsecurity.org> User-Agent: Mutt/1.4.2.1i Cc: current@freebsd.org, Sergey Zaharchenko Subject: Re: Processes in "ufs" state (PR kern/104406) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Oct 2006 18:10:16 -0000 On Sun, Oct 15, 2006 at 01:11:52PM -0400, Kris Kennaway wrote: > On Sun, Oct 15, 2006 at 12:35:11PM +0400, Sergey Zaharchenko wrote: > > Hello list! > > > > I've stumbled across this (probable) bug when doing some > > number-crunching. Processes which try to access the filesystem hang at > > some point when another process has been gobbling up CPU time for a > > sufficiently long time. Interestingly, processes which have already > > opened some files before the `hang' can apparently read/write them > > without hindrance (iostat shows some disk activity). Interactive > > processes run well too. When the number-cruncher is `kill -STOP'ped and > > `kill -CONT'ed, everything runs well for another while. It's reliably > > and frequently reproducible here both on recent and late August CURRENT, > > the kernel is GENERIC, the hardware is basic (no RAID, etc.). > > > > Could anyone experienced enough try to look into this and/or give advice > > for debugging the problem? I have ddb available, but I'm not sure about > > where to look. > > > > http://www.freebsd.org/cgi/query-pr.cgi?pr=104406 > > I'm unable to reproduce so far. > > Kris Same here. -- Peter Holm