From owner-freebsd-stable@FreeBSD.ORG Sun Oct 21 12:24:43 2012 Return-Path: Delivered-To: stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id F004C14B for ; Sun, 21 Oct 2012 12:24:43 +0000 (UTC) (envelope-from david@catwhisker.org) Received: from albert.catwhisker.org (m209-73.dsl.rawbw.com [198.144.209.73]) by mx1.freebsd.org (Postfix) with ESMTP id A3D648FC12 for ; Sun, 21 Oct 2012 12:24:43 +0000 (UTC) Received: from albert.catwhisker.org (localhost [127.0.0.1]) by albert.catwhisker.org (8.14.5/8.14.5) with ESMTP id q9LCObSo039359; Sun, 21 Oct 2012 05:24:37 -0700 (PDT) (envelope-from david@albert.catwhisker.org) Received: (from david@localhost) by albert.catwhisker.org (8.14.5/8.14.5/Submit) id q9LCObQM039358; Sun, 21 Oct 2012 05:24:37 -0700 (PDT) (envelope-from david) Date: Sun, 21 Oct 2012 05:24:37 -0700 From: David Wolfskill To: Konstantin Belousov Subject: Re: stable/9 @r241776 panic: REDZONE: Buffer underflow detected... Message-ID: <20121021122437.GE1817@albert.catwhisker.org> References: <20121020141019.GW1817@albert.catwhisker.org> <20121021121356.GJ35915@deviant.kiev.zoral.com.ua> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="GkyPMzQoklWKZOV/" Content-Disposition: inline In-Reply-To: <20121021121356.GJ35915@deviant.kiev.zoral.com.ua> User-Agent: Mutt/1.5.21 (2010-09-15) Cc: stable@freebsd.org X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 21 Oct 2012 12:24:44 -0000 --GkyPMzQoklWKZOV/ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Oct 21, 2012 at 03:13:56PM +0300, Konstantin Belousov wrote: > ... > > Anyone else seeing this? Any ideas how to diagnose it? >=20 > devread is the method of devctl(4) which passes devd notifications from > the kernel to userland (to devd, specifically). There were no changes to > devctl(4) for quite a time. I noticed that none of the changes in the last update seemed at all relevant, yes. And thank you for the background (devread()). > The corruption is, most likely, in some unrelated piece of code. Could > you try to bisect the stable to catch the offender ? The bisect is not > guaranteed to work, obviously, since the random corruption effects are > unpredictable. I'll try -- but before I do, I've just removed a couple of custom stanzas from /etc/devd.conf (after noting that updating to r241776 does not appear to have affected the reported symptoms). So if the removal avoids the problem, that may reduce the searching a fair bit. :-) (I'm also informed by my spouse that I'm to help her prepare for some expected rain today; this may reduce the amount of time I am able to spend on it.) Adding the above-cited stanzas to devd.conf is one of the few things that I did on the laptop that I haven't done elsewhere -- and while I only track stable/9 daily on a couple of machines, I have 3 more that I update Sunday mornings .... which would be now. We shall see. :-} Peace, david --=20 David H. Wolfskill david@catwhisker.org Taliban: Evil men with guns afraid of truth from a 14-year old girl. See http://www.catwhisker.org/~david/publickey.gpg for my public key. --GkyPMzQoklWKZOV/ Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlCD6YMACgkQmprOCmdXAD1uiQCfdaowMw3P3u5lX5FxP4upc/59 8RYAn330XWfbM8gLAt/Ixt8fyB/rB4f5 =88VF -----END PGP SIGNATURE----- --GkyPMzQoklWKZOV/--