linux-kernel - Re: Corrupted files after suspend to disk

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Message-ID: <4F3D90E1.6010001@redhat.com>
Date:	Thu, 16 Feb 2012 15:27:29 -0800
From:	Eric Sandeen <sandeen@...hat.com>
To:	Dave Jones <davej@...hat.com>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-pm@...ts.linux-foundation.org, esandeen@...hat.com
Subject: Re: Corrupted files after suspend to disk

On 2/16/12 8:30 AM, Dave Jones wrote:
> On Thu, Feb 16, 2012 at 11:52:27AM +0100, richard -rw- weinberger wrote:
>  
>  > >> >> Of course, please test the above separately. :-)
>  > >> >
>  > >> > Ok, I'll test this when I'm at home.
>  > >> >
>  > >> > BTW: dropping the caches helps, when some files seem corrupted.
>  > >> > Today /usr/bin/okular was broken.
>  > >> > After setting vm.drop_caches=1 it worked again.
>  > >>
>  > >> On Linux 2.6.38 I'm unable to reproduce the issue.
>  > >> Only 2.6.37 seems to be affected.
>  > >> So, I'm moving over to 2.6.38. :)
>  > >
>  > Bad news:
>  > I saw the issue on 3.x too but thought it's because my IdeaPad s10 is crap.
>  > Now with my shiny new Lenovo x121e I have the same issue! :-(
>  > 
>  > OpenSUSE 12.1, kernel 3.2.7.
>  > After a few suspend2disk iterations random files are corrupted.
>  > But only cached files. A reboot solves the problem.

Just to be clear - you see _data_ corruption in files, but only
until a reboot, and after that they are ok?  Ok, reading above
about using drop_caches that sounds like the case.

That sounds different from what I saw in the bug Dave mentions
below, but possibly related root cause, I suppose.

-Eric

> FWIW, we've been seeing a number of hard to diagnose failures
> with suspend to disk for the last few releases in Fedora.
> Eric Sandeen has been chasing https://bugzilla.redhat.com/show_bug.cgi?id=744275
> for a while, but there's no smoking gun that really explains what's
> getting into these states. Further complicating things, is that it
> doesn't seem to be 100% reproducable.
> 
> 	Dave
> 

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