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Artix Linux Forum

Artix Linux => System => Topic started by: Roberto on 01 December 2018, 21:53:27

Title: File system corruption in ext4 in Linux 4.19
Post by: Roberto on 01 December 2018, 21:53:27
Hi guys,

there are reports on the kernel mailing list and elsewhere that users have received a corrupt file system after upgrading to Linux 4.19.
A file system check and return to Linux 4.18 solved the problem for all concerned.
To what extent is Artix openrc or runit affected?

The kernel 4.19.4 is installed on my system.

Code: [Select]
uname -r
4.19.4-artix1-1-ARTIX

greets
Roberto
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: fungalnet on 02 December 2018, 02:42:32
If you deleted your cache there is still 4.14lts in the repository.  I have kept the last version of 4.15, 4.16. 4.17, and 4.18.
But I think there was a bug in 4.19.3 affecting RAID disks and  I believe it was found and fixed already.  I read too fast so don't take my word on it.
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: Roberto on 02 December 2018, 09:54:25
So far I have not been able to spot any mistakes.
I just wanted to ask for safety's sake before I get into trouble.

Thx.
Robert
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: Chris Cromer on 03 December 2018, 23:24:05
I have had this issue happen to me with 4.19.1 and 4.19.5. Under 4.19.1 it happened to me every single reboot. Under 4.19.5 it has only happened once in various reboots. For the meantime I ended up dropping back to 4.18 until a fix can be found.
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: Roberto on 04 December 2018, 20:30:13
So what do I have to do, to drop back to 4.18.?
I was using Manjaro openrc before and there I knew what to to, using mhwd.
But with artix, I have no experience downgrading a kernel.

Roberto
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: fungalnet on 05 December 2018, 00:43:20
If you don't have 4.18.6 in your cache (/var/cache/pacman/pkg) then install linux-lts and use that one (4.14).
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: Roberto on 05 December 2018, 20:45:53
Quote from: fungalnet – on
If you don't have 4.18.6 in your cache (/var/cache/pacman/pkg) then install linux-lts and use that one (4.14).

Okay, thanks a lot

Roberto
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: Roberto on 05 December 2018, 21:31:19
I have dropped back to Linux-LTS 4.14 successfully.
Now I wait until the fix for 4.19  will be found.

thx
Roberto
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: fungalnet on 07 December 2018, 20:34:40
4.19 4.20 fix (https://www.phoronix.com/scan.php?page=news_item&px=Linux-4.19-4.20-BLK-MQ-Fix)
Quote
Fortunately, as of this evening 5/11/18, Jens Axboe submitted a pull request with the fix and it's now landed in Linux 4.20 Git. Axboe commented, "Under a combination of circumstance, the direct issue path in blk-mq could corrupt data. This wasn't easy to hit, but the ones that are affected by it, seem to hit it pretty easily. None of the regular filesystem and storage testing has triggered it, even though it's been around since 4.19-rc1."


The patch is quite small and should be back-ported to Linux 4.19 for its next stable point release, which will be Linux 4.19.8. The code did not land in time for today's Linux 4.19.7 point release.
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: fungalnet on 10 December 2018, 20:34:05
linux4.19.8  is in Gremlins for anyone that didn't notice or doesn't have Gremlins on.  Since this is a serious bug fix anyone running 4.19.7 or earlier should upgrade ASAP
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: kekek on 11 December 2018, 05:37:56
pacman -Si linux

Repository      : system
Version         : 4.19.8.arch1-1
Title: Re: File system corruption in ext4 in Linux 4.19
Post by: dreieck on 17 December 2018, 14:03:08
The problem is described there: https://bugzilla.kernel.org/show_bug.cgi?id=201685

And a fix seems to be this patch: https://bugzilla.kernel.org/attachment.cgi?id=279857&action=diff

It seems to be not only related to ext4 and 4.19, although it seems that ext4 on 4.19 triggers this problem quite often.
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