Comment # 3 on bug 1043912 from Nikolay Borisov

So while reading the chunk tree the mount code finds discrepancy between the
size written in the super block and the size of the underlying device. It's
interesting that the difference is negligible - 3584 bytes. Could someone with
affected system (I haven't been able to reproduce this) attach the output of
the following two commands: 

btrfs inspect-internal dump-super -af /dev/vdb
btrfs inspect-internal dump-tree -d /dev/vdb


they will dump respectively the all superblocks and the the device-related
trees.