can only mount btrfs filesystems with standard crc32c checksum, fails with xxhash, sha256

[Florian Riepen]

I created a new btrfs filesystem like the following:

sudo mkfs.btrfs -L cold_storage -f --csum xxhash /dev/sdd1

Mounting it with:

sudo mount /dev/sdb1 /mnt/cold_storage

Fails with the message:

mount: /mnt/cold_storage: wrong fs type, bad option, bad superblock on /dev/sdd1, missing codepage or helper program, or other error.

Looking at dmesg | tail I can find the following:

[ 1788.813725] BTRFS error (device sdd1): unsupported checksum algorithm: 1
[ 1788.836552] BTRFS error (device sdd1): open_ctree failed

The error is the same for the xxhash and sha256 checksums. Only recreating the filesystem with crc32c / omitting the --csum option entirely allows me to mount it afterwards. I tried mounting with and without compression enabled, no difference.

My System:
lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 20.04.3 LTS
Release: 20.04
Codename: focal

uname -a
Linux pentiumpower 5.4.0-89-generic #100-Ubuntu SMP Fri Sep 24 14:50:10 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

btrfs version
btrfs-progs v5.4.1

apt-cache policy btrfs-progs
btrfs-progs:
  Installiert: 5.4.1-2
  Installationskandidat: 5.4.1-2
  Versionstabelle:
 *** 5.4.1-2 500
        500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[DiagonalArg (diagonalarg)]

Same error on Ubuntu 20.04, except I used sha256 to create the filesystem.