Errors on newly created file system

[Ferry Toth <fntoth@gmail.com>]

The following is originally done by Yocto's bitbake, but when I try 
manually it reproduces.

I create a new fs on  a file using -r as ordinary user, then btrfs check 
the file (before or after mounting makes no difference), also as an 
ordinary user.

The fs has 1000's of errors, I cut most because it seems the same type 
of errors. The files system is unrepaired bootable, but can be repaired 
using --repair, in which 1000's of files are moved to lost+found.

The below was mkfs on a non-existing file, but writing to 16GB dduped 
file (rootfs is 1.4GB) makes no difference. Neither does dropping 
--shrink, -m or -n.

Also, writing the file to an actual disk and then check the disk gives 
the same errors.

What could this be?

ferry@delfion:~/tmp/edison/edison-scarthgap$ mkfs.btrfs -n 4096 --shrink 
-M -v -r 
/home/ferry/tmp/edison-intel/my/edison-morty/out/linux64/build/tmp/work/edison-poky-linux/edison-image/1.0/rootfs 
edison-image-edison.rootfs.btrfs
btrfs-progs v6.6.3
See https://btrfs.readthedocs.io for more information.

ERROR: zoned: unable to stat edison-image-edison.rootfs.btrfs
NOTE: several default settings have changed in version 5.15, please make 
sure
       this does not affect your deployments:
       - DUP for metadata (-m dup)
       - enabled no-holes (-O no-holes)
       - enabled free-space-tree (-R free-space-tree)

Rootdir from: 
/home/ferry/tmp/edison-intel/my/edison-morty/out/linux64/build/tmp/work/edison-poky-linux/edison-image/1.0/rootfs
   Shrink:           yes
Label:              (null)
UUID:               c2ecfaca-168a-401b-a12a-e73694d7485a
Node size:          4096
Sector size:        4096
Filesystem size:    1.43GiB
Block group profiles:
   Data+Metadata:    single            1.42GiB
   System:           single            4.00MiB
SSD detected:       no
Zoned device:       no
Incompat features:  mixed-bg, extref, skinny-metadata, no-holes, 
free-space-tree
Runtime features:   free-space-tree
Checksum:           crc32c
Number of devices:  1
Devices:
    ID        SIZE  PATH
     1     1.43GiB  edison-image-edison.rootfs.btrfs

ferry@delfion:~/tmp/edison/edison-scarthgap$ btrfs check 
edison-image-edison.rootfs.btrfs
Opening filesystem to check...
Checking filesystem on edison-image-edison.rootfs.btrfs
UUID: c2ecfaca-168a-401b-a12a-e73694d7485a
[1/7] checking root items
[2/7] checking extents
[3/7] checking free space tree
[4/7] checking fs roots
root 5 inode 252551099 errors 2000, link count wrong
         unresolved ref dir 260778488 index 2 namelen 11 name 
COPYING.MIT filetype 1 errors 0
root 5 inode 252551611 errors 2000, link count wrong
         unresolved ref dir 260775820 index 79 namelen 18 name 
generic_Apache-2.0 filetype 1 errors 0
root 5 inode 252575069 errors 2000, link count wrong
         unresolved ref dir 260777976 index 3 namelen 10 name recipeinfo 
filetype 1 errors 0
root 5 inode 252575538 errors 2000, link count wrong
         unresolved ref dir 260778506 index 3 namelen 10 name recipeinfo 
filetype 1 errors 0
root 5 inode 252577241 errors 2000, link count wrong
         unresolved ref dir 260777972 index 3 namelen 10 name recipeinfo 
filetype 1 errors 0
root 5 inode 256713617 errors 2000, link count wrong
         unresolved ref dir 260776096 index 3 namelen 12 name 
GPL-2.0-only filetype 1 errors 0
root 5 inode 256713619 errors 2000, link count wrong
         unresolved ref dir 260776096 index 5 namelen 13 name 
LGPL-2.1-only filetype 1 errors 0
root 5 inode 256713620 errors 2000, link count wrong
         unresolved ref dir 260776096 index 6 namelen 10 name recipeinfo 
filetype 1 errors 0
root 5 inode 256730804 errors 2000, link count wrong
         unresolved ref dir 260777541 index 3 namelen 7 name COPYING 
filetype 1 errors 0
         unresolved ref dir 260777543 index 3 namelen 7 name COPYING 
filetype 1 errors 0
root 5 inode 256730805 errors 2000, link count wrong
         unresolved ref dir 260777541 index 4 namelen 11 name 
COPYING.LIB filetype 1 errors 0
         unresolved ref dir 260777543 index 4 namelen 11 name 
COPYING.LIB filetype 1 errors 0
root 5 inode 256730806 errors 2000, link count wrong
         unresolved ref dir 260777541 index 5 namelen 15 name 
COPYING.RUNTIME filetype 1 errors 0
         unresolved ref dir 260777543 index 5 namelen 15 name 
COPYING.RUNTIME filetype 1 errors 0
root 5 inode 256730807 errors 2000, link count wrong
         unresolved ref dir 260777541 index 6 namelen 8 name COPYING3 
filetype 1 errors 0
         unresolved ref dir 260777543 index 6 namelen 8 name COPYING3 
filetype 1 errors 0
root 5 inode 256730808 errors 2000, link count wrong
         unresolved ref dir 260777541 index 7 namelen 12 name 
COPYING3.LIB filetype 1 errors 0
         unresolved ref dir 260777543 index 7 namelen 12 name 
COPYING3.LIB filetype 1 errors 0

...

         unresolved ref dir 260777434 index 4 namelen 10 name recipeinfo 
filetype 1 errors 0
         unresolved ref dir 260777436 index 4 namelen 10 name recipeinfo 
filetype 1 errors 0
         unresolved ref dir 260777438 index 4 namelen 10 name recipeinfo 
filetype 1 errors 0
root 5 inode 260775819 errors 2000, link count wrong
         unresolved ref dir 260775820 index 2 namelen 16 name 
license.manifest filetype 1 errors 0
ERROR: errors found in fs roots
found 1061572608 bytes used, error(s) found
total csum bytes: 990472
total tree bytes: 47329280
total fs tree bytes: 44457984
total extent tree bytes: 1511424
btree space waste bytes: 11573386
file data blocks allocated: 1014243328
  referenced 1014243328