When listing the subvolumes with btrfs subvol list command, btrfs fails with a
This is a known issue on the development mailinglist, as of today. To fix:
As of today, the proposed patch has not hit the "main" btrfs-progs repository however Miao Xie, one the BTRFS developers has integrated it in its own git repository:
Just clone this one in a temporary localtion and rebuild this "flavor" of btrfs-progs.