On Thu, May 10, 2018 at 09:00:36AM +0000, Nikhil wrote:
> We have i.Mx35 based embedded system running Linux 4.14. The distribution
> is built using yocto (rocko branch). Before we moved on to Linux 4.14 we
> used Linux 2.6, distribution was again built using yocto(danny branch).
> After upgrade to rocko and linux 4.14, we see some error messages on the
> console on executing blkid. These messages appear for the SD card. Error
> messages appear only if SD Card is mounted and if the start sector for sd
> card is 129 or more, doesnt appear is start sector is 128 or less.
>
> Error Message:
> root@ebboard:~# blkid
> [ 8707.475004] attempt to access beyond end of device
> [ 8707.479894] unknown-block(179,0): rw=0, want=1953793, limit=1953792
> [ 8707.488054] Buffer I/O error on dev mmcblk0p1, logical block 244207,
> async page read
>
> fdisk output:
> root@ebboard:~# fdisk -ul
>
> Disk /dev/mmcblk0: 1000 MB, 1000341504 bytes
> 4 heads, 16 sectors/track, 30528 cylinders, total 1953792 sectors
> Units = sectors of 1 * 512 = 512 bytes
>
> Device Boot Start End Blocks Id System
> /dev/mmcblk0p1 129 1953791 976831+ 6 FAT16
>
> If anyone has any idea as to why these warnings are printed depending on
> whether the start sector is > 128 would be very much helpful. Thanks.
Maybe kernel returns incorrect size for the device, or it's blkid bug.
Can you try
LIBBLKID_DEBUG=all blkid -p -o udev /dev/mmcblk0p1
or for /dev/mmcblk0 (not sure if kernel reports it for whole-disk
probing or for the partition).
util-linux version ? (blkid -V).
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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