qemu corrupts qcow2 image

[Francesco Potortì]

Binary package hint: qemu

Qemu 0.10.0 occasionally corrupts qcow2 images. The problem should be solved in 0.10.2.

This is how I observed it the first time:

$ qemu-img convert -c -O qcow2 wxpsp3-wlm-noacpi.qcow wxpsp3-wlm-noacpi.copia.qcow
qemu-img: error while reading

$ qemu-img info wxpsp3-wlm-noacpi.qcow
image: wxpsp3-wlm-noacpi.qcow
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 5.5G
cluster_size: 4096
highest_alloc: 5891559424
num_free_bytes: 3783917568

[Francesco Potortì (pot)]

It turns out that the image was really corrupted, in fact qemu cannot use it (it says unbootable disk).
It was qemu itself that corrupted it, but I fear this is another problem, and I can not reproduce nor diagnose it.

So I think this bug should be closed, unless someone wants to see the corrupted image.

[Francesco Potortì (pot)]

I read that qemu 0.10.2 includes corrections that solve qcow2 images corruption problems.
So I suspect that this bug is related to qcow2 corruption. In fact, since reporting I had two more instances of qcow2 corruption, which I recovered only by restoring a backup.

Please package 0.10.2, I think this bug should be given the highest severity for a package.

[Francesco Potortì (pot)]

I observed qcow2 corruption three times in total. Moreover qcw2 corruption is cited in qemu 0.10.2 changelog.

[sciencewhiz (christmasboy-81)]

qemu 0.10.4 is out, and also has a fix for qcow2 corruption

 - fix qcow2 corruption in cluster freeing (Gleb Natapov)

[Dustin Kirkland  (kirkland)]

This is fixed in karmic's qemu-kvm.

:-Dustin