chris@chriseee ~ % sudo mount -t btrfs /dev/sda1 mnt
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

32 chris@chriseee ~ % dmesg | tail -5
device label btrfsPart devid 1 transid 25870 /dev/sda1
parent transid verify failed on 64466944 wanted 25870 found 20155
parent transid verify failed on 64466944 wanted 25870 found 20155
parent transid verify failed on 64466944 wanted 25870 found 20155
btrfs: open_ctree failed
chris@chriseee ~ % sudo btrfs-debug-tree /dev/sda1
parent transid verify failed on 64466944 wanted 25870 found 20155
parent transid verify failed on 64466944 wanted 25870 found 20155
parent transid verify failed on 64466944 wanted 25870 found 20155
btrfs-debug-tree: disk-io.c:739: open_ctree_fd: Assertion `!(!tree_root->node)' failed.
134 chris@chriseee ~ %