Re: Corrupted files after suspend to disk

[richard -rw- weinberger]

On Thu, Mar 24, 2011 at 12:00 AM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
> On Wednesday, March 23, 2011, richard -rw- weinberger wrote:
>> On Wed, Mar 23, 2011 at 11:22 PM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
>> > On Wednesday, March 23, 2011, richard -rw- weinberger wrote:
>> >> On Wed, Mar 23, 2011 at 11:11 PM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
>> >> > On Wednesday, March 23, 2011, richard -rw- weinberger wrote:
>> >> >> 2011/3/23 Rafael J. Wysocki <rjw@xxxxxxx>:
>> >> >> > 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.
>
> There's a couple things you can check before we start asking other people for
> help.
>
> First, it would be good to know if things change when you save the image
> into a swap file instead of the swap partition you've been using so far
> (I believe it's documented quite well how to do that).
>
> Second, please verify if using the built-in save/load hibernate code leads
> to the same issue (you can hibernate by doing "echo disk > /sys/power/state"
> to verify that).
>
> 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.

> Thanks,
> Rafael
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-- 
Thanks,
//richard
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