[Qemu-devel] [Bug 984953] Re: qemu-img alters (breaks) disk image content when converting to VDI

[Stefan Weil]

Which version of QEMU did you use? I think your report is a
duplicate of bug report #919242. It was fixed by this commit:

commit 641543b76b82a8b361482b727e08de0c8ec093b0
Author: Stefan Weil <address@hidden>
Date:   Sat Jan 21 13:54:24 2012 +0100

    block/vdi: Zero unused parts when allocating a new block (fix
#919242)

Latest QEMU does not show an error with your test sequence.

Regards,

Stefan Weil

** Changed in: qemu
     Assignee: (unassigned) => Stefan Weil (ubuntu-weilnetz)

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https://bugs.launchpad.net/bugs/984953

Title:
  qemu-img alters (breaks) disk image content when converting to VDI

Status in QEMU:
  New

Bug description:
  When using "qemu-img convert" to create a VDI image, the VDI image is
  valid, but may contain an altered disk image. When such an image is
  run under VirtualBox, subtle bugs such as spontaneous segmentation
  faults happen because of broken system libraries.

  The following set of commands reproduces the bug (using the provided
  test disk image slice):

  bunzip2 < test-2M-2.raw.bz2 > test.raw
  qemu-img convert -O vdi test.raw test-2.vdi
  qemu-img convert -O raw test-2.vdi test-2.raw
  diff -qs test.raw test-2.raw
  # Output: Files test.raw and test-2.raw differ

  If the VDI image is created via "VBoxManage convertfromraw",
  everything is okay:

  VBoxManage convertfromraw test.raw test-3.vdi --format VDI
  qemu-img convert -O raw test-3.vdi test-3.raw
  diff -qs test.raw test-3.raw
  # Output: Files test.raw and test-3.raw are identical

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