====== Could not allocate block ======


<code>
ERROR: core-image-minimal-1.0-r0 do_image_wic: ExecutionError('build/tmp/work/.../core-image-minimal/1.0/temp/run.do_image_wic.1471812', 1, None, None)
...

| Writing inode tables: done 
| Creating journal (4096 blocks): done
| Copying files into the device: __populate_fs: Could not allocate block in ext2 filesystem while writing file "cc1"
| mkfs.ext4: Could not allocate block in ext2 filesystem while populating file system
| 512
| 
| WARNING: exit code 1 from a shell command.
</code>

Not related to free space in image size. Tested with:
<code bash>
    IMAGE_ROOTFS_EXTRA_SPACE:append = " + 150000"
    IMAGE_OVERHEAD_FACTOR = "2"
</code>   

Conclusions:
  * It is related to build on ZFS. In this case LXC on Proxmox's LXC.
  * It works before. 
  * It works for another (bigger) image.
  * It is related to ''wic'' image. 
  * Yocto's ''image.bbclass'' was fixed to correctly calculate sizes on compressed ZFS:
    * Problem raised here: [[https://lists.yoctoproject.org/g/poky/topic/image_bbclass/81548542|image.bbclass - get_rootfs_size]]
    * And fixed here:
      * [[https://git.yoctoproject.org/poky/commit/?h=master-next&id=3743234dab23e4068e1d1fde9e1fa0bc09fdb182|lib/oe/utils: add directory size function]]
      * [[https://git.yoctoproject.org/poky/commit/?h=master-next&id=f7ed81182c7797fd6b0069fa5c90535b13848657|classes/image: use oe.utils.directory_size() instead of du]]
  * Problem still exists in [[https://git.yoctoproject.org/poky/tree/scripts/lib/wic/partition.py#n279|poky/scripts/lib/wic/partition.py]]
    * Task ''do_image_wic''.
    * ''du'' returns real disc usage (135649) (on compressed ZFS) instead of data size (250920).
    * adding ''--apparent-size'' fixes the issue (''du_cmd = "du -bks %s --apparent-size" % rootfs_dir'')
    * Bug filled [[https://bugzilla.yoctoproject.org/show_bug.cgi?id=15951]]