[ 2543.584263] BTRFS info (device vda3): using crc32c (crc32c-intel) checksum algorithm [ 2543.585391] BTRFS info (device vda3): using free space tree [ 2543.588294] BTRFS info (device vda3): checking UUID tree [ 2543.686219] BTRFS: device fsid 3a31c937-5278-4404-a391-7b6baa5db5a1 devid 1 transid 6 /dev/vda4 scanned by mkfs.btrfs (564862)