[Bug 616151] [NEW] Buffer I/O Errors with emulated usb disk image

[thedward]

Public bug reported:

Binary package hint: qemu-kvm

Description:    Ubuntu 10.04.1 LTS
Release:        10.04

qemu-kvm version 0.12.3+noroms-0ubuntu9.2

I expected using disk images with the -usbdevice  option to work without
errors.

Instead I get lots of I/O errors on the guest operating system.

When trying to use a emulated usb disk from an image like so:

   qemu -hda root.img  -usbdevice disk:usb.img

When I write to the simulated disk in the guest operating sytem (Debian or Ubuntu)
I get several errors like this:

"Buffer I/O error on device sda1, logical block 570" (dozens)
"end_request: I/O error, dev sda, sector 656"

This also generally causes the disk image to become corrupted.

I have tried this with various image formats (including raw and qcow2)
and with both FAT and ext4 filesystems. I have tried creating the file systems
inside and outside of qemu.

The same disk images work fine if I attached them to a loop device
then give the loop device as the argument to -usbdevice:

    sudo losetup /dev/loop0 usb.img
    qemu -hda root.img  -usbdevice disk:/dev/loop0

** Affects: qemu-kvm (Ubuntu)
     Importance: Undecided
         Status: New

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Buffer I/O Errors with emulated usb disk image
https://bugs.launchpad.net/bugs/616151
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