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

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Date:	Wed, 23 Mar 2011 23:30:39 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: Corrupted files after suspend to disk

On Wed, Mar 23, 2011 at 11:22 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> 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?

Yes.
Seems like a cache issue.


> Rafael
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-- 
Thanks,
//richard
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