Source:
ls -1 /var/lib/uvtool/libvirt/images/*
/var/lib/uvtool/libvirt/images/kvmguest-xenial-normal-ds.qcow
/var/lib/uvtool/libvirt/images/kvmguest-xenial-normal.qcow
/var/lib/uvtool/libvirt/images/x-uvt-b64-Y29tLnVidW50dS5jbG91ZC5kYWlseTpzZXJ2ZXI6MTYuMDQ6cHBjNjRlbCAyMDE3MDQyNA==

Target:
/var/lib/uvtool/libvirt/images/x-uvt-b64-Y29tLnVidW50dS5jbG91ZC5kYWlseTpzZXJ2ZXI6MTYuMDQ6cHBjNjRlbCAyMDE3MDQyNA==

So the base image is there that the qcows refer to (is a prereq)
qemu-img info /var/lib/uvtool/libvirt/images/kvmguest-xenial-normal.qcow
image: /var/lib/uvtool/libvirt/images/kvmguest-xenial-normal.qcow
[...]
backing file: 
/var/lib/uvtool/libvirt/images/x-uvt-b64-Y29tLnVidW50dS5jbG91ZC5kYWlseTpzZXJ2ZXI6MTYuMDQ6cHBjNjRlbCAyMDE3MDQyNA==

Migration with --copy-storage-all working just fine (--copy-storage-inc as 
well).
Tested on Xenial and Zesty as latest LTS and latest release (on ppc64el).
I'll push that to the regular testing to see if it triggers on a more frequent 
testing.

Might I ask if this is 100% reproducible for you or if it happens at a
lower rate?

So we are back to find what is different in your case and/or get the
crash report you are seeing.

** Changed in: qemu (Ubuntu)
       Status: Triaged => Incomplete

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Title:
  Ubuntu17.04 KVM: Non-shared migration: nbd_receive_request():L710:
  read failed

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