Re: Massive filesystem corruption since kernel 5.2 (ARCH)

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

On 2019/7/29 下午10:46, Swâmi Petaramesh wrote:
> Le 29/07/2019 à 16:40, Qu Wenruo a écrit :
>> At least from what I see in this transid error, unless you ruled out the
>> possibility of bad disk firmware and LVM/LUKS, it's hard to say it's
>> btrfs causing the problem.
>
> Well it would be such a coincidence that a machine that has been 100%
> stable since 2014 suddently crashes 2 filesystems on 2 different disks
> justy after upgrading to 5.2 and both things would be unrelated.
>
> Can happen, but the chances...

If I understand your two threads correctly, one is this transid error,
the other one is tree-checker, which is completely different from this one.

The tree-checker one is mostly caused by older fs, and as you mentioned,
reverting to 5.1 solves that problem.

This transid won't be resolved whatever kernel version you use, it's a
real corruption in extent tree, caused by incorrect metadata CoW.

So they are two different problems, and this transid error can be
completely unrelated to 5.2 kernel.

Thanks,
Qu

>
>> In fact, we have a more experienced sysadmin, Zygo, sharing his
>> experience of bad *HARDWARE* causing various Flush/FUA problem, which is
>> not easy to hit in normal use case, but only after power loss.
>
>> So for your transid error, it's really hard to pin down the cause,
>> unless you have deployed hundreds btrfs...
>
> For the record I am a professional sysadmin with 20+ years Linux
> experience and I have deployed BTRFS on dozens of systems (OK maybe not
> hundreds, not sure)...>
> Kind regards.
>
> ॐ
>