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

[Volker Grabsch]

** Description changed:

  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 2>/dev/null
+ 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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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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