```
tree extent[30474240, 16384] parent 78826651648 has no backref item in extent tree
backpointer mismatch on [30474240 16384]
adding new tree backref on start 30474240 len 16384 parent 78826651648 root 78826651648
Repaired extent references for 30474240
bad full backref, on [30490624]
ERROR: commit_root already set when starting transaction
ERROR: failed to start transaction: Invalid argument
failed to repair damaged filesystem, aborting
beryllium:~#
```
… bugger!
