Comment # 2 on bug 1205649 from Thomas Leroy

After some investigations, it seems that my disk is corrupted, segfaulting
mount.

The disk checksum is incorrect:
```
$ sudo btrfs check --readonly /dev/dm-0
Opening filesystem to check...
checksum verify failed on 543625379840 wanted 0x9e961bf2 found 0x1395587a
checksum verify failed on 543625379840 wanted 0x9e961bf2 found 0x1395587a
bad tree block 543625379840, bytenr mismatch, want=543625379840,
have=10138529428048294778
...
```

--repair also failed due to checksum mismatch. (I'm working on a backup)

I also can't `btrfs restore` the disk, I got the same checksum error than
`btrfs check`.

Supers are valid:
```
$ sudo btrfs rescue super-recover /dev/dm-0
All supers are valid, no need to recover.
```

But there are unrecoverable chunk:
```
$ sudo btrfs rescue chunk-recover /dev/dm-0
...
corrupt node: root=1 block=1107050496 slot=0, corrupt node: root=1
block=1107050496, nritems too large, have 15 expect [1,0]
Couldn't read tree root
open with broken chunk error
```