Comment 21 for bug 1392504

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Serge Hallyn (serge-hallyn) wrote : Re: USB Passthrough is not working anymore

I haven't seen an error like that, and cannot reproduce it here.

Another way to test that apparmor is causing the problem would be to add

 /dev/** rw,

at the bottom of the file /etc/apparmor.d/abstractions/libvirt-qemu. When you next start the vm apparmor should allow it full access to all devices.