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

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Date:   Wed, 28 Nov 2018 23:09:55 +0100
From:   Rainer Fiebig <jrf@...lbox.org>
To:     Andrey Melnikov <temnota.am@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: ext4 file system corruption with v4.19.3 / v4.19.4

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.

> 
>> 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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