virt-aa-helper reports actually already a good message internally:

  virt-aa-helper: error: skipped restricted file
  virt-aa-helper: error: invalid VM definition

You'd already see it in journal or on a systemctl to libvirtd:
Jun 19 11:35:53 c libvirtd[25978]: 2018-06-19 11:35:53.415+0000: 25979: error : 
virCommandWait:2601 : internal error: Child process 
(LIBVIRT_LOG_OUTPUTS=3:stderr /usr/lib/libvirt/virt-aa-helper -p 0 -r -u 
libvirt-8763795d-f056-4373-9d57-3d3bad391e5a -f 
'/var/lib/libvirt/images/break,^*[]", foo"me.qcow') unexpected exit status 1: 
virt-aa-helper: error: /var/lib/libvirt/images/break,^*[]", foo"me.qcow
Jun 19 11:35:53 c libvirtd[25978]: virt-aa-helper: error: skipped restricted 
file
Jun 19 11:35:53 c libvirtd[25978]: virt-aa-helper: error: invalid VM definition
Jun 19 11:35:53 c libvirtd[25978]: 2018-06-19 11:35:53.415+0000: 25979: error : 
AppArmorSetSecurityImageLabel:843 : internal error: cannot update AppArmor 
profile 'libvirt-8763795d-f056-4373-9d57-3d3bad391e5a'

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https://bugs.launchpad.net/bugs/1767934

Title:
  breaking the apparmor profile leads to misleading error messages

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