linux-kernel - Re: ext4 file system corruption with v4.19.3 / v4.19.4

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Date:   Sun, 2 Dec 2018 23:19:30 +0300
From:   Andrey Melnikov <temnota.am@...il.com>
To:     jrf@...lbox.org, "Theodore Ts'o" <tytso@....edu>
Cc:     linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: ext4 file system corruption with v4.19.3 / v4.19.4

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.