Comment 4 for bug 1587065

I also have a path mounted twice, but this time it's devicemapper and not AUFS like tim, so maybe not fs type related.

virsh version:
  Compiled against library: libvirt 1.3.1
  Using library: libvirt 1.3.1
  Using API: QEMU 1.3.1
  Running hypervisor: QEMU 2.5.0

KVM/QEMU Host command:
    virsh snapshot-create-as $VM_NAME \
            ${VM_NAME}_snapshot \
            "${VM_NAME} snapshot $(date +%Y-%m-%d-%H%M%S)" \
        --diskspec vda,file=${VM_QCOW_FILE}-snap.qcow2 \
        --disk-only \
        --atomic \
        --no-metadata \
        --quiesce

VM similar mount source:
  /dev/mapper/delve--vg-root on / type ext4 (rw,relatime,discard,errors=remount-ro,data=ordered)
  /dev/mapper/delve--vg-root on /var/lib/docker/devicemapper type ext4 (rw,relatime,discard,errors=remount-ro,data=ordered)

In the VM logs:
  Sep 8 12:48:45 xxxxxxxx qemu-ga: info: guest-fsfreeze called