Public bug reported:

The current version of btrfs-progs in Ubuntu 16.04 produces false
positives when checking a healthy btrfs filesystem:

user@hostname:~$ sudo btrfsck /dev/sdb
Checking filesystem on /dev/sdb
UUID: 61d71zg9-2h4a-4hf2f-b782-c23645es4h0
checking extents
bad metadata [1054547705856, 1054547722240) crossing stripe boundary
bad metadata [1054797594624, 1054797611008) crossing stripe boundary
bad metadata [1054863392768, 1054863409152) crossing stripe boundary
[...]

This is a known bug that has been fixed upstream (v4.5.2):

https://github.com/kdave/btrfs-
progs/commit/12234d0202a30fb225ebae817b5eb2e80b641d4c

I hope this fix can be backported to prevent unnecessary and possibly
harmful filesystem repair attempts.


Version information:
~$ uname -a
Linux kk 4.4.0-22-generic #39-Ubuntu SMP Thu May 5 16:53:32 UTC 2016 x86_64 
x86_64 x86_64 GNU/Linux

~$ btrfs --version
btrfs-progs v4.4

** Affects: btrfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1580257

Title:
  btrfsck false warning: metadata extent crossing stripe boundary

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