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* Error: failed to read chunk root
@ 2020-09-25  4:24 Jacob Riddle
  0 siblings, 0 replies; only message in thread
From: Jacob Riddle @ 2020-09-25  4:24 UTC (permalink / raw)
  To: linux-btrfs

Information requested by 
https://btrfs.wiki.kernel.org/index.php/Btrfs_mailing_list:
 > uname -a
Linux ranger 5.8.7-1-default #1 SMP Sun Sep 6 07:39:46 UTC 2020 
(7fc52c0) x86_64 x86_64v x86_64 GNU/Linux
 > btrfs --version
btrfs-progs v5.7
 > btrfs fi show
Label: none  uuid: 3570f55b-a52a-482f-9629-ba282cdd3ada
         Total devices 1 FS bytes used 17.01GiB
         devid    1 size 20.00GiB used 20.00GiB path /dev/nvme0n1p3

Label: none  uuid: 9d1911ef-773e-4a73-978a-5814fcf46f68
          Total devices 1 FS bytes used 870.93GiB
          devid    1 size 1.82TiB used 874.08GiB path /dev/bcache0
 > btrfs fi df /home # Replace /home with the mount point of your 
btrfs-filesystem
Cannot provide for /home as filesystem is unmountable
 > dmesg > dmesg.log

Error is in the body.

I am running OpenSUSE Tumbleweed. My home mount is a Bcache device with 
BTRFS. I
did an update and restarted the computer. Everything seemed to be going 
well,
untill KDE stopped loading. I switched to a virtual terminal to see what the
problem was. Upon logging in, I was presented with a stream of BTRFS 
errors. I
don't remember what the errors were, as I prompltly forced the computer 
down. I
booted into the recovery kernel, and tried doing `mount /home`. I now 
get this
error:

[    6.848351] BTRFS info (device bcache0): use zstd compression, level 3
[    6.848352] BTRFS info (device bcache0): disk space caching is enabled
[    6.848353] BTRFS info (device bcache0): has skinny extents
[    6.848802] BTRFS error (device bcache0): bad tree block start, want 
1129766191104 have 1123189522432
[    6.848806] BTRFS error (device bcache0): failed to read chunk root
[    6.884205] BTRFS error (device bcache0): open_ctree failed
mount: /home: wrong fs type, bad option, bad superblock on /dev/bcache0, 
missing codepage or helper program, or other error.

Can I recover from this? If so, what steps do I need to take?


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