Public bug reported:

With qemu 2.10 image files will be locked on specific bytes for

See for more:
(qemu) commit 244a5668106297378391b768e7288eb157616f64
Author: Fam Zheng <>
    file-posix: Add image locking to perm operations

That will trigger:
apparmor="DENIED" operation="file_lock" 
name="/var/lib/uvtool/libvirt/images/kvmguest-artful-normal.qcow" pid=7001 
comm="qemu-system-x86" requested_mask="k" denied_mask="k" fsuid=0 ouid=0

Which in turn needs a fix in virt-aa-helper

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: In Progress

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: Won't Fix

** Also affects: qemu (Ubuntu)
   Importance: Undecided
       Status: New

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  Failed to lock byte 100

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