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

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Date:   Wed, 28 Nov 2018 16:56:51 +0100
From:   Rainer Fiebig <jrf@...lbox.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Andrey Jr. Melnikov" <temnota.am@...il.com>,
        linux-ext4@...r.kernel.org
Subject: Re: ext4 file system corruption with v4.19.3 / v4.19.4

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.

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

If you still have the problem after that, you may want to learn how to bisect. 
;)

So long!

Rainer Fiebig


> 
> > (b) What hardware are you using?  (SSD?  SATA-attached?
> > NVMe-attached?)
> 
> SATA HDD WDC WD20EZRZ-00Z5HB0.
> 
> > (c) Are you using LVM?  LUKS (e.g., disk encrypted)?
> 
> No and no. Plain ext4.
> -- cut --
> debugfs:  features
> Filesystem features: has_journal ext_attr resize_inode dir_index filetype
> needs_recovery extent 64bit flex_bg sparse_super large_file huge_file
> dir_nlink extra_isize metadata_csum
> -- cut --
> 
> > (d) are you using discard?  One theory is a recent discard change may
> > be in play.   How do you use discard?   (mount option, fstrim, etc.)
> 
> no

-- 
The truth always turns out to be simpler than you thought.
Richard Feynman
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