Date:   Wed, 5 Dec 2018 15:58:06 +0300
From:   Andrey Melnikov <temnota.am@...il.com>
To:     jrf@...lbox.org
Cc:     "Theodore Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org,
        linux-ext4@...r.kernel.org
Subject: Re: ext4 file system corruption with v4.19.3 / v4.19.4

пн, 3 дек. 2018 г. в 01:11, Rainer Fiebig <jrf@...lbox.org>:
>
> Am 02.12.18 um 21:19 schrieb Andrey Melnikov:
> > чт, 29 нояб. 2018 г. в 01:08, Rainer Fiebig <jrf@...lbox.org>:
> >>
> >> Am 28.11.18 um 22:13 schrieb Andrey Melnikov:
> >>> ср, 28 нояб. 2018 г. в 18:55, Rainer Fiebig <jrf@...lbox.org>:
> >>>>
> >>>> Am Mittwoch, 28. November 2018, 13:02:56 schrieb Andrey Jr. Melnikov:
> >>>>> In gmane.comp.file-systems.ext4 Theodore Y. Ts'o <tytso@....edu> wrote:
> >>>>>> On Wed, Nov 28, 2018 at 03:16:33AM +0300, Andrey Jr. Melnikov wrote:
> >>>>>>> Corrupted inodes - always directory, not touched at least year or
> >>>>>>> more for writing. Something wrong when updating atime?
> >>>>>>
> >>>>>> We're not sure.  The frustrating thing is that it's not reproducing
> >>>>>> for me.  I run extensive regression tests, and I'm using 4.19 on my
> >>>>>> development laptop without notcing any problems.  If I could reproduce
> >>>>>> it, I could debug it, but since I can't, I need to rely on those who
> >>>>>> are seeing the problem to help pinpoint the problem.
> >>>>>
> >>>>> My workstation hit this bug every time after boot. If you have an idea - I
> >>>>> may test it.
> >>>>>
> >>>>>> I'm trying to figure out common factors from those people who are
> >>>>>> reporting problems.
> >>>>>>
> >>>>>> (a) What distribution are you running (it appears that many people
> >>>>>> reporting problems are running Ubuntu, but this may be a sampling
> >>>>>> issue; lots of people run Ubuntu)?  (For the record, I'm using Debian
> >>>>>> Testing.)
> >>>>>
> >>>>> Debian sid but self-build kernel from ubuntu mainline-ppa.
> >>>>
> >>>> You could try a vanilla 4.19.5 from https://www.kernel.org/
> >>>> and compile it with your current .config.
> >>>
> >>> mainline-ppa use vanilla kernel. Patches only adds debian specific
> >>> build infrastructure.
> >>>
> >>>> If you still see the errors, at least the Ubuntu-kernel could be ruled out.
> >>>>
> >>>> In addition, if you still see the errors:
> >>>>
> >>>> - backup your .config in a *different* folder (so that you can later re-use
> >>>> it)
> >>>> - do a "make mrproper" (deletes the .config, see above)
> >>>> - do a "make defconfig"
> >>>> - and compile the kernel with that new .config
> >>>
> >>> defconfig is great - for abstract hardware in vacuum.
> >>>
> >>>> If you still have the problem after that, you may want to learn how to bisect.
> >>>> ;)
> >>> I'm already know how-to bisect. From kernel 2.0 era. Without git ;)
> >>>
> >>> This problem simply non-bisectable, when same kernel corrupt FS on my
> >>> workstation but normally working on other servers.
> >>> And now - FS corrupted again with disabled CONFIG_EXT4_ENCRYPTION. Great.
> >>
> >> OK, - and now we are looking forward to *your* ideas how to solve this.
> >
> > After four days playing games around git bisect - real winner is
> > debian gcc-8.2.0-9. Upgrade it to 8.2.0-10 or use 7.3.0-30 version for
> > same kernel + config - does not exhibit ext4 corruption.
> >
> > I think I hit this https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87859
> > with 8.2.0-9 version.
> >
> Good that it works for you. But others used gcc 5.4.0 or 6.3.0 and were
> hit anyway: https://bugzilla.kernel.org/show_bug.cgi?id=201685#c165

Depends on workload pattern. 4.19.5 built with 8.2.0-10 and 7.3.0-30 -
crashed after 4 hours of usage (previous build crash in 5 min).
So my assumption about broken gcc is wrong.

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