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That probably means it's a ceph bug. Could you generate a log of this happening with cache=none and upload it to a new bug in tracker.ceph.com, e.g. by putting this in your /etc/ceph/ceph.conf on the node that runs the vm: [client] debug ms = 1 debug rbd = 20 log file = /tmp/rbd.$pid.log log...

Could you verify that the disk imported correctly? i.e. compare the md5sum before import with the md5sum the file created by 'rbd export'? You may be running into http://tracker.ceph.com/issues/4388.