Re: uncorrectable errors in Raid 10

[Steffen Sindzinski <stesind@gmail.com>]

Hi,

I updated to btrfs-progs v4.14-5-gf09e98a3. Unfortunately after 10h 
Gnome desktop / Arch crashed with btrfs check --lowmem unfinished. I 
will run it this night again.

The result until crash was:

Checking filesystem on /dev/sdd2
UUID: 4fafd0d4-7dd9-4dcc-9a33-5f1ad9555358
ERROR: extent[15923092037632, 73728] referencer count mismatch (root: 
260, owner: 3631467, offset: 1019904) wanted: 4, have: 6
ERROR: extent[16078964924416, 69632] referencer count mismatch (root: 
260, owner: 4086589, offset: 4296704) wanted: 5, have: 7

Steffen


Am 22.11.2017 um 17:42 schrieb Chris Murphy:
> On Wed, Nov 22, 2017 at 9:38 AM, Steffen Sindzinski <stesind@gmail.com> wrote:
>> Hello,
>>
>> I did btrfs check --readonly on both disk without finding any error. To
>> reconfirm I did a scrub again which still has found 2 uncorrectable errors.
> 
> Try --mode=lowmem option with btrfs-progs 4.3.3 or better 4.14. This
> is a new implementation of btrfs check and sometimes it comes up with
> different results. It's strange that there's only this error found by
> scrub and not by btrfs check which should be fully checking all
> metadata for sanity, and in the process it would surely hit a bad
> checksum.
> 
>