I can confirm that the error messages on Ubuntu 16.04 (daily) still
exist but it seems that it is not as bad as it looks.
I followed the steps which Marcin described in comment #16. Instead of
> Write some data on backing file via loop device
> dd if=/dev/zero of=/mnt/Test.file bs=1M count=512
I copied a known iso file to the created loop device
dd if=lubuntu-14.04.4-desktop-amd64.iso of=/mnt/Test.file bs=1M
I got also some error messages as described in previous comments but
md5sum said
md5sum lubuntu-14.04.4-desktop-amd64.iso && md5sum /mnt/Test.file
0b0fc8652afe0761edc3ed33e1b199f0 lubuntu-14.04.4-desktop-amd64.iso
0b0fc8652afe0761edc3ed33e1b199f0 /mnt/Test.file
Then I unmounted the test image and checked it for errors.
umount /mnt/
fsck -pvcf ./Test.img
...and I got:
fsck from util-linux 2.27.1
./Test.img: Updating bad block inode.
12 inodes used (0.02%, out of 65536)
0 non-contiguous files (0.0%)
0 non-contiguous directories (0.0%)
# of inodes with ind/dind/tind blocks: 0/0/0
Extent depth histogram: 3/1
201308 blocks used (76.79%, out of 262144)
0 bad blocks
1 large file
1 regular file
2 directories
0 character device files
0 block device files
0 fifos
0 links
0 symbolic links (0 fast symbolic links)
0 sockets
------------
3 files
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https://bugs.launchpad.net/bugs/1526537
Title:
blk_update_request: I/O error
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