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Message-ID: <AANLkTi=cn04WZGMnVX6ie5PSM+9v0tJSSg0kD8_W5N11@mail.gmail.com> Date: Fri, 10 Dec 2010 20:14:56 -0600 From: Jon Nelson <jnelson@...poni.net> To: "Ted Ts'o" <tytso@....edu>, Matt <jackdachef@...il.com>, Chris Mason <chris.mason@...cle.com>, Andi Kleen <andi@...stfloor.org>, Jon Nelson <jnelson@...poni.net>, Mike Snitzer <snitzer@...hat.com>, Milan Broz <mbroz@...hat.com>, linux-btrfs <linux-btrfs@...r.kernel.org>, dm-devel <dm-devel@...hat.com>, Linux Kernel <linux-kernel@...r.kernel.org>, htd <htd@...cy-poultry.org>, htejun <htejun@...il.com>, linux-ext4 <linux-ext4@...r.kernel.org> Subject: Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt barrier support is effective) On Fri, Dec 10, 2010 at 10:54 AM, Jon Nelson <jnelson@...poni.net> wrote: > On Fri, Dec 10, 2010 at 8:58 AM, Jon Nelson <jnelson@...poni.net> wrote: >> On Fri, Dec 10, 2010 at 12:52 AM, Jon Nelson <jnelson@...poni.net> wrote: >>> On Thu, Dec 9, 2010 at 8:38 PM, Ted Ts'o <tytso@....edu> wrote: >>>> On Fri, Dec 10, 2010 at 02:53:30AM +0100, Matt wrote: >>>>> >>>>> Try a kernel before 5a87b7a5da250c9be6d757758425dfeaf8ed3179 >>>>> >>>>> from the tests I've done that one showed the least or no corruption if >>>>> you count the empty /etc/env.d/03opengl as an artefact >>>> >>>> Yes, that's a good test. Also try commit bd2d0210cf. The patch >>>> series that is most likely to be at fault if there is a regression in >>>> between 5a87b7a5d and bd2d0210cf inclusive. >>>> >>>> I did a lot of testing before submitting it, but that wa a tricky >>>> rewrite. If you can reproduce the problem reliably, it might be good >>>> to try commit 16828088f9 (the commit before 5a87b7a5d) and commit >>>> bd2d0210cf. If it reliably reproduces on bd2d0210cf, but is clean on >>>> 16828088f9, then it's my ext4 block i/o submission patches, and we'll >>>> need to either figure out what's going on or back out that set of >>>> changes. >>>> >>>> If that's the case, a bisect of those changes (it's only 6 commits, so >>>> it shouldn't take long) would be most appreciated. >>> >>> I observed the behavior on bd2d0210cf in a qemu-kvm install of >>> openSUSE 11.3 (x86_64) on *totally* different host - an AMD quad-core. >>> >>> I did /not/ observe the behavior on 16828088f9 (yet). I'll run the >>> test a few more times on 1682.. >>> >>> Additionally, I am building a bisected kernel now ( >>> cb20d5188366f04d96d2e07b1240cc92170ade40 ), but won't be able to get >>> back at it for a while. >> >> cb20d5188366f04d96d2e07b1240cc92170ade40 seems OK so far. I'm going to >> try 1de3e3df917459422cb2aecac440febc8879d410 soon. > > Barring false negatives, bd2d0210cf22f2bd0cef72eb97cf94fc7d31d8cc > appears to be the culprit (according to git bisect). > I will test bd2d0210cf22f2bd0cef72eb97cf94fc7d31d8cc again, confirm > the behavior, and work backwards to try to reduce the possibility of > false negatives. A few additional notes, in no particular order: - For me, triggering the problem is fairly easy when encryption is involved. - I'm now 81 iterations into testing bd2d0210cf22f2bd0cef72eb97cf94fc7d31d8cc *without* encryption. Out of 81 iterations, I have 4 failures: #16, 40, 62, and 64. I will now try 1de3e3df917459422cb2aecac440febc8879d410 much more extensively. Is this useful information? -- Jon -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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