Copy container from btrfs to lvm fails with I/O error

[tomp (Thomas Parrott)]

@stgraber mentioned btrfs scrub start which may be useful for you:

Btrfs error when moving specific lxd container

Those lines indicate data corruption on the disk, as you’re using a loop, this may indicate data corruption on the underlying disk which may not have gotten detected. Did your system recently crash, suffer power loss or had its disk completely filled up? In any case, you can try something like: mount /dev/loop7 /mnt btrfs scrub start /mnt This will scan the entire filesystem to look for any issues.