According to that answer it does not seem to be a bug, but a feature :)
Also another answer about virtualization (which is NOT my case, but can
be useful for others):
In the KVM case define your backing store as non-cached:
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source dev='/dev/XXX'/>
<target dev='vda' bus='virtio'/>
</disk>
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https://bugs.launchpad.net/bugs/882013
Title:
barrier-based sync failed - disabling barriers
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