Date: Sun, 21 Oct 2012 05:24:37 -0700 From: David Wolfskill <david@catwhisker.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: stable@freebsd.org Subject: Re: stable/9 @r241776 panic: REDZONE: Buffer underflow detected... Message-ID: <20121021122437.GE1817@albert.catwhisker.org> In-Reply-To: <20121021121356.GJ35915@deviant.kiev.zoral.com.ua> References: <20121020141019.GW1817@albert.catwhisker.org> <20121021121356.GJ35915@deviant.kiev.zoral.com.ua>
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--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/--
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