linux-kernel - Re: [Regression] 3.15 mmc related ext4 corruption with qemu-system-arm

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Date:	Fri, 8 Aug 2014 21:03:14 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	"Theodore Ts'o" <tytso@....edu>,
	John Stultz <john.stultz@...aro.org>,
	Kees Cook <keescook@...omium.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Chris Ball <chris@...ntf.net>,
	Peter Maydell <peter.maydell@...aro.org>,
	Johan Rudholm <jrudholm@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [Regression] 3.15 mmc related ext4 corruption with qemu-system-arm

On Fri, Aug 8, 2014 at 5:32 PM, Theodore Ts'o <tytso@....edu> wrote:
> On Fri, Aug 08, 2014 at 05:17:54PM -0700, John Stultz wrote:
>> On 08/08/2014 05:15 PM, Kees Cook wrote:
>> > On Fri, Aug 8, 2014 at 2:14 PM, John Stultz <john.stultz@...aro.org> wrote:
>> >> I sunk a couple of weeks bisecting to try to narrow down the more
>> >> sporadic issue, but was unsuccessful past the initial commit above.
>> >> Since then I've been far too swamped to spend any more time on it. Even
>> >> so, its a *major* pain for testing but it seems like no one else really
>> >> cares?
>> > I'm in the same boat as far as poor bisection results. :(
>> >
>> > However, I keep using the 3-patch mmci fix series from Ulf, and
>> > haven't hit any trouble with them. Though perhaps I'm just getting
>> > lucky?
>> >
>> > http://git.kernel.org/cgit/linux/kernel/git/kees/linux.git/log/?h=arm/fix-mmci
>>
>> I guess I'll give that another shot
>
> There was an ext4 bug that might have caused this problem.  It was
> fixed in v3.15.6 and v3.16-rc5.

Sweet! Many thanks to Eric for chasing that down (I spent a ton of
time with no results, so I can't imagine how much effort it took him)
and you for pointing it out.

So yes, so far I'm not seeing any filesystem panics w/ Linus' head  +
with Ulf's patches in Kees tree above. That makes me *very* happy.

Ulf: Are you planning to push those upstream (and to -stable) soon?

thanks
-john
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