Comment 0 for bug 748340

Binary package hint: btrfs-tools

current btrfsck on natty reports:
couldn't open because of unsupported option features (2).
fsck.btrfs: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
...if invoked on the standard root/home.

Meaning that when the link fsck.btrfs -> btrfsck was enabled as per Bug #660649 my system now stops booting with this message:
fsck from util-linux-ng 2.17.2
fsck from util-linux-ng 2.17.2
fsck from util-linux-ng 2.17.2
couldn't open because of unsupported option features (2).
fsck.btrfs: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
Warning... fsck.btrfs for device /dev/sda5 exited with signal 6.
mountall: fsck /home [313] terminated with status 8
mountall: Unrecoverable fsck error: /home
couldn't open because of unsupported option features (2).
fsck.btrfs: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
Warning... fsck.btrfs for device /dev/sda5 exited with signal 6.
mountall: fsck / [312] terminated with status 8
mountall: Unrecoverable fsck error: /
/dev/sda1: clean, 233/48768 files, 44709/194560 blocks
init: udev-fallback-graphics main process (625) terminated with status 1

If [I] is pressed to ignore errors booting can be done normally, just bypassing btrfsck completely.