Joseph, I encounter this problem also in ubuntu 15.04 with a linux-
image-3.19.0-15-generic.
I can append some additional information how to reproduce this issue.
After my analysis I found dependence: drive filesystem vs backing file
filesystem:
Create backing file on a drive that is formatted to NTFS
dd if=/dev/zero of=./Test.img bs=1M count=1024
Find free loop device
losetup -f
Connect backing file with a loop device [ losetup -f ], for example: /dev/loop3
losetup /dev/loop3 ./Test.img
Create filesystem on backing file via loop device
mkfs.ext4 /dev/loop3
Mount backing file via loop device into /mnt directory
mount -t ext4 /dev/loop3 /mnt/
Write some data on backing file via loop device
dd if=/dev/zero of=/mnt/Test.file bs=1M count=512
After this procedure you will be see errors on a kernel log:
[ 1370.381087] blk_update_request: I/O error, dev loop3, sector 25864
[ 1370.789277] blk_update_request: I/O error, dev loop3, sector 29960
[ 1371.193360] blk_update_request: I/O error, dev loop3, sector 34056
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1526537
Title:
blk_update_request: I/O error
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