Created image can be checked without starting a VM
qemu-img check /var/lib/uvtool/libvirt/images/kvmguest-precise.qcow
qemu-img: '' uses a qcow2 feature which is not supported by this qemu version:
QCOW version 3
qemu-img: Could not open
'/var/lib/uvtool/libvirt/images/kvmguest-precise.qcow': Operation not supported
This even happens with a Compat 0.10 XML on creation:
<volume>
<name>kvmguest-precise.qcow</name>
<allocation>0</allocation>
<capacity unit="G">8</capacity>
<target>
<format type="qcow2"/>
<compat>0.10</compat>
</target>
<backingStore>
<path>/var/lib/uvtool/libvirt/images/x-uvt-b64-Y29tLnVidW50dS5jbG91ZC5kYWlseTpzZXJ2ZXI6MTIuMDQ6YW1kNjQgMjAxNjA4Mjk=</path>
<format type="qcow2"/>
</backingStore>
</volume>
A qemu-img created image works
qemu-img create -f qcow2 /tmp/test.qcow2 10M
Formatting '/tmp/test.qcow2', fmt=qcow2 size=10485760 encryption=off
cluster_size=65536
qemu-img check /tmp/test.qcow2
Leaked cluster 0 refcount=2 reference=1
Leaked cluster 1 refcount=2 reference=1
Leaked cluster 2 refcount=2 reference=1
Leaked cluster 3 refcount=2 reference=1
4 leaked clusters were found on the image.
This means waste of disk space, but no harm to data.
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https://bugs.launchpad.net/bugs/1620633
Title:
qcow image created in precise is not usable
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