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grub2 getting confused about btrfs root subvolume

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http://ubuntuforums.org – My root filesystem is btrfs, on device sdc1, subvolume "@root", which is also the default subvolume: Code: :~$ mount -l /dev/sdc1 on / type btrfs (rw,compress) -snip- :~$ sudo btrfs subvolume list -a / ID 256 gen 18200 top level 5 path <FS_TREE>/@root -snip- :~$ sudo btrfs subvolume get-default / ID 256 gen 18202 top level 5 path <FS_TREE>/@root :~$ cat /etc/fstab -snip- #### ROOT #### UUID=b08f7d56-0fb3-47df-857b-c1fdc6365a41  /  btrfs  compress 0      1 -snip- update-grub runs as normal: Code: cfg ... (Hardware)