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

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Date:	Wed, 23 Mar 2011 23:22:52 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"richard -rw- weinberger" <richard.weinberger@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: Corrupted files after suspend to disk

On Wednesday, March 23, 2011, richard -rw- weinberger wrote:
> On Wed, Mar 23, 2011 at 11:11 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > On Wednesday, March 23, 2011, richard -rw- weinberger wrote:
> >> 2011/3/23 Rafael J. Wysocki <rjw@...k.pl>:
> >> > On Wednesday, March 23, 2011, richard -rw- weinberger wrote:
> >> >> Hi,
> >> >>
> >> >> I'm facing a very strange problem on my netbook (Lenovo Ideapad S10)
> >> >> running Linux 2.6.37.4.
> >> >> After resuming from s2disk some files are corrupted.
> >> >> But when I reboot my netbook everything seems good again.
> >> >>
> >> >> When I saw the problem the first time the ls command segfaulted always.
> >> >> I did a reboot and it worked again.
> >> >>
> >> >> A few days later zypper crashed. After a reboot it worked again.
> >> >> And today ssh crashed. I looked a bit closer and saw it crashed
> >> >> somewhere within libcrypto.
> >> >> So I made copy libcrypto and rebooted.
> >> >> After the reboot ssh worked again but libcrypto and the copy of it hat
> >> >> a different sha1 sum!
> >> >> WTF?!
> >> >>
> >> >> Is this a known issue?
> >> >
> >> > No.
> >> >
> >> >> dmesgs and config are attached.
> >> >>
> >> >> The used distribution is openSUSE 11.4 with suspend-0.80.20100129-7.1
> >> >> (default from suse).
> >> >> I'm using ext3 as root filesystem.
> >> >> What else do you need?
> >> >
> >> > Whatever you can do to narrow down the problem.  At the moment I only know
> >> > that it's there.
> >>
> >> I can reproduce the problem now.
> >> After ~20 suspend and resume iterations aide finds corrupted files in /lib/.
> >> It's always a very basic lib like libcrypto, libglib which is used all
> >> the time on my system.
> >
> > Those files are never intentionally modified, right?
> >
> >> Maybe it's an issue like this one?
> >> https://lkml.org/lkml/2010/12/2/339
> >
> > It might have if that patch hadn't been merged before 2.6.37.
> >
> > Is the system 32-bit or 64-bit?
> 
> It's a 32-bit system.
> cmp shows that the corrupted files differ in many bytes (not scattered).
> The corrupted bytes are always 0 or 252.

Do I understand correctly that the files apparently corrupted after resume
are not corrupted any more when you reboot?

Rafael
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