Public bug reported:

We fixed an issue around disk locking already in regard to qemu-nbd [1],
but there still seem to be issues.

$ virsh migrate --live --copy-storage-all kvmguest-artful-normal 
qemu+ssh://10.22.69.196/system
error: internal error: qemu unexpectedly closed the monitor: 
2017-08-18T12:10:29.800397Z qemu-system-x86_64: -chardev pty,id=charserial0: 
char device redirected to /dev/pts/0 (label charserial0)
2017-08-18T12:10:48.545776Z qemu-system-x86_64: load of migration failed: 
Input/output error

Source libvirt log for the guest:
2017-08-18 12:09:08.251+0000: initiating migration
2017-08-18T12:09:08.809023Z qemu-system-x86_64: Unable to read from socket: 
Connection reset by peer
2017-08-18T12:09:08.809481Z qemu-system-x86_64: Unable to read from socket: 
Connection reset by peer

Target libvirt log for the guest:
2017-08-18T12:09:08.730911Z qemu-system-x86_64: load of migration failed: 
Input/output error
2017-08-18 12:09:09.010+0000: shutting down, reason=crashed

Given the timing it seems that the actual copy now works (it is busy ~10 
seconds on my environment which would be the copy).
Also we don't see the old errors we saw before, but afterwards on the actual 
take-over it fails.

Dmesg has no related denials as often apparmor is in the mix.

Need to check libvirt logs of source [2] and target [3] in Detail.

[1]: https://lists.gnu.org/archive/html/qemu-devel/2017-08/msg02200.html
[2]: http://paste.ubuntu.com/25339356/
[3]: http://paste.ubuntu.com/25339358/

** Affects: libvirt (Ubuntu)
     Importance: High
     Assignee: ChristianEhrhardt (paelzer)
         Status: Confirmed

** Changed in: libvirt (Ubuntu)
       Status: New => Confirmed

** Changed in: libvirt (Ubuntu)
   Importance: Undecided => High

** Changed in: libvirt (Ubuntu)
     Assignee: (unassigned) => ChristianEhrhardt (paelzer)

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https://bugs.launchpad.net/bugs/1711602

Title:
  --copy-storage-all failing with qemu 2.10

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