I have copied all of the content of the guest machine, deleted the image
ubuntu-pdc-vdb.img and created a new one without "fallocate", but only
with preallocation=metadata. The problem is that the image is growing
progressively and has obviously no limit, although I gave it one. The
root filesystem's image is the same case:

qemu-img info ubuntu-pdc-vda.img 
image: ubuntu-pdc-vda.img
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 14G
cluster_size: 65536

and for confirmation:
du -sh ubuntu-pdc-vda.img 
15G     ubuntu-pdc-vda.img

I made a test and saw that when I delete something from the guest, the real 
size of the image is not decreasing (I read it is normal). OK, but when I write 
something again, it doesn't use the freed space, but instead grows the image. 
So for example:
1. The initial physical size of the image is 1GB.
2. I copy 1GB of data in the guest. It's physical size becomes 2GB.
3. I delete this data (1GB). The physical size of the image remains 2GB.
4. I copy another 1GB of data to the guest.
5. The physical size of the image becomes 3GB.
6. And so on with no limit. It doesn't care if the virtual size is less.

Is this normal - the real/physical size of the image to be larger than
the virtual limit???

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https://bugs.launchpad.net/bugs/1022901

Title:
  Ubuntu 12.04 64bit Guest (qemu/kvm) dies randomly

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