in my case the (v2) space cache was preventing a repair, causing this error.
after invoking `btrfs check --clear-space-cache v2 <device>`, `--repair` stopped complaining. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/748340 Title: btrfsck fails with "unsupported option features", must [ignore] to boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/btrfs-tools/+bug/748340/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs