From owner-freebsd-hackers@FreeBSD.ORG Thu Aug 27 20:20:07 2009 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 773CC106568E for ; Thu, 27 Aug 2009 20:20:07 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mail.zoral.com.ua (skuns.zoral.com.ua [91.193.166.194]) by mx1.freebsd.org (Postfix) with ESMTP id C95C18FC39 for ; Thu, 27 Aug 2009 20:20:06 +0000 (UTC) Received: from deviant.kiev.zoral.com.ua (root@deviant.kiev.zoral.com.ua [10.1.1.148]) by mail.zoral.com.ua (8.14.2/8.14.2) with ESMTP id n7RKK0B3070882 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 27 Aug 2009 23:20:01 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: from deviant.kiev.zoral.com.ua (kostik@localhost [127.0.0.1]) by deviant.kiev.zoral.com.ua (8.14.3/8.14.3) with ESMTP id n7RKK03q091570; Thu, 27 Aug 2009 23:20:00 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: (from kostik@localhost) by deviant.kiev.zoral.com.ua (8.14.3/8.14.3/Submit) id n7RKK0b6091569; Thu, 27 Aug 2009 23:20:00 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: deviant.kiev.zoral.com.ua: kostik set sender to kostikbel@gmail.com using -f Date: Thu, 27 Aug 2009 23:20:00 +0300 From: Kostik Belousov To: Linda Messerschmidt Message-ID: <20090827202000.GQ9623@deviant.kiev.zoral.com.ua> References: <237c27100908261203g7e771400o2d9603220d1f1e0b@mail.gmail.com> <200908261642.59419.jhb@freebsd.org> <237c27100908271314v28e6c710s8a278064333d1d20@mail.gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="vgR9NaMwtk/oK4d5" Content-Disposition: inline In-Reply-To: <237c27100908271314v28e6c710s8a278064333d1d20@mail.gmail.com> User-Agent: Mutt/1.4.2.3i X-Virus-Scanned: clamav-milter 0.95.2 at skuns.kiev.zoral.com.ua X-Virus-Status: Clean X-Spam-Status: No, score=-4.4 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on skuns.kiev.zoral.com.ua Cc: freebsd-hackers@freebsd.org Subject: Re: Intermittent system hangs on 7.2-RELEASE-p1 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Aug 2009 20:20:07 -0000 --vgR9NaMwtk/oK4d5 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Aug 27, 2009 at 04:14:39PM -0400, Linda Messerschmidt wrote: > On Wed, Aug 26, 2009 at 4:42 PM, John Baldwin wrote: > > One thing to note is that ktrace only logs voluntary context switches (= i.e. > > call to tsleep or waiting on a condition variable). It specifically do= es not > > log preemptions or blocking on a mutex, >=20 > I was not aware, thanks. >=20 > > so in theory if your machine was > > livelocked temporarily that might explain this. >=20 > How would we determine that? >=20 > We are now able to reproduce this on a test machine, even after > slipping in a 7.2-STABLE kernel with KTR enabled. So we have a lot > more options now. >=20 > Unfortunately, I don't really "get" KTR yet. It looks like it has > relevant info, but I was unable to correlate its huge timestamps (e.g. > 6795522404430562) to ktrace output times (e.g. 1251387606.225544) > showing problem areas. >=20 > What's my best bet from here? How much memory is installed ? --vgR9NaMwtk/oK4d5 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkqW6nAACgkQC3+MBN1Mb4jSAwCgkAqNs76fjgjU8lxUzJkslk/e qmEAn3nPACrDtWMffwx47nUEAS1EtI7X =lY55 -----END PGP SIGNATURE----- --vgR9NaMwtk/oK4d5--