[Bug 1292234] Re: qcow2 image corruption on non-extent filesystems (ext3)

[Josep M. Perez]

Apparently this bug is also present in Debian. In my case the corrupted
image was a windows one. When I run qemu-img check over it it will
complain about lots of clusters, and if I pass it the repair flag, then
it will end up crashing with the following message:

$  qemu-img check -r all windows.img
Repairing cluster 0 refcount=0 reference=1
Repairing cluster 1 refcount=0 reference=1
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
Repairing cluster 2 refcount=0 reference=1
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
Repairing cluster 3 refcount=0 reference=1
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
Repairing cluster 4 refcount=0 reference=1
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
Repairing cluster 5 refcount=0 reference=1
qcow2: Preventing invalid write on metadata (overlaps with active L1 table); image marked as corrupt.
Repairing cluster 6 refcount=0 reference=1
...
Repairing OFLAG_COPIED data cluster: l2_entry=8000000397a59000 refcount=0
Repairing OFLAG_COPIED data cluster: l2_entry=8000000397a5a000 refcount=0
Repairing OFLAG_COPIED data cluster: l2_entry=800000000001b000 refcount=0
The following inconsistencies were found and repaired:

    0 leaked clusters
    97850 corruptions

Double checking the fixed image now...
[1]    27716 segmentation fault (core dumped)  qemu-img check -r all windows.img


Has anyone else tried this over a copy of the corrupted image?

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https://bugs.launchpad.net/bugs/1292234

Title:
  qcow2 image corruption on non-extent filesystems (ext3)

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