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Date:   Wed, 28 Nov 2018 09:02:05 +0100
From:   Marek Habersack <grendel@...stedcode.net>
To:     "Theodore Y. Ts'o" <tytso@....edu>,
        "Andrey Jr. Melnikov" <temnota.am@...il.com>,
        linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: ext4 file system corruption with v4.19.3 / v4.19.4

On 28/11/2018 05:15, Theodore Y. Ts'o 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?
I've just seen the errors come back despite having MQ off :( However, this time it took 5 days for them to come back, so
MQ must play a role here. Also, indeed, they happened after fstrim ran and this time *only* on the SSD disks reported
below, another clue? This time the errors were "just" orphaned inodes + invalid free inode counts, all repaired without
issues by fsck.

> 
> 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.
> 
> 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.)
Ubuntu 18.10 here

> 
> (b) What hardware are you using?  (SSD?  SATA-attached?
> NVMe-attached?)
The errors occured on both SSD:
  - Samsung SSD 850 EVO 1TB, firmware rev EMT03B6Q
  - OCZ-AGILITY3, firmware rev 2.25

and spinning rust:
  - Seagate ST2000DX001-1CM164, firmware revision CC43

> 
> (c) Are you using LVM?  LUKS (e.g., disk encrypted)?
LUKS. Both the Samsung and the Seagate use DM for encryption.

> (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.)
fstrim runs weekly and the Samsung SSD is mounted with

   rw,nosuid,nodev,noatime,discard,helper=crypt

marek
> 
>       	      	     	     		- Ted
> 

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