When performing live block migration with "virsh --copy-storage-inc" (this
internally uses QEMU QMP command 'drive-mirror'), guest crashes:

    $ virsh migrate --verbose \
        --copy-storage-inc --p2p \
        --live cvm2 qemu+ssh://root@devstack1/system
     error: internal error: guest unexpectedly quit


Relevant QEMU error, from /var/log/libvirt/qemu/cvm2.log:

    [. . .]
    Co-routine re-entered recursively
    2015-09-28 10:45:26.232+0000: shutting down


Version
-------

    libvirt-daemon-driver-qemu-1.2.13.1-2.fc22.x86_64
    qemu-system-x86-2.3.1-1.fc22.x86_64

Steps to Reproduce
------------------

(1) Setup two hosts such that password-less SSH via sudo works just fine:

(2) Since I'm testing a trusted network, I'm using the below insecure
    configs (for testing only!) in destination libvirtd.conf:
        
        [. . .]
        listen_tls = 0
        listen_tcp = 1
        auth_tcp = "none"
        [. . .]

(3) Perform live block migration, with non-shared storage:

    $ virsh migrate --verbose \
        --copy-storage-inc --p2p --live cvm2 \
        qemu+ssh://root@desthost/system

And, observe the failure on stderr, libvirtd.log & in the QEMU log of
the guest.


Actual results
--------------

Guest on sources shuts down, consequently live block migration with
non-shared storage fails:

    `virsh` stderr: "error: internal error: guest unexpectedly quit"


Expected results
----------------

'drive-mirror' should proceed successfully, resulting in a succesful
libvirt live block migration.


Contextual libvirtd.log
-----------------------

With log filters:
    log_filters="3:event 3:file 1:util 1:security 1:qemu 1:libvirt"
    log_outputs="1:file:/var/log/libvirt/libvirtd.log"

$ less /var/log/libvirt/libvirtd.log
[. . .]
2015-09-28 10:45:26.231+0000: 2537: error : qemuMonitorIO:662 : internal error: End of file from monitor
2015-09-28 10:45:26.231+0000: 2537: debug : qemuMonitorIO:717 : Error on monitor internal error: End of file from monitor
2015-09-28 10:45:26.231+0000: 2537: debug : qemuMonitorIO:738 : Triggering EOF callback
2015-09-28 10:45:26.231+0000: 2537: debug : qemuProcessHandleMonitorEOF:307 : Received EOF on 0x7f2be0003bb0 'cvm2'
2015-09-28 10:45:26.231+0000: 2537: debug : qemuProcessHandleMonitorEOF:325 : Monitor connection to 'cvm2' closed without SHUTDOWN event; assuming the domain crashed
[. . .]


Error info from /var/log/libvirt/qemu/cirrvm2.log
-------------------------------------------------

[. . .]
WARNING: Image format was not specified for 'nbd://devstack1:49153/drive-virtio-disk0' and probing guessed raw.
         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
         Specify the 'raw' format explicitly to remove the restrictions.
Co-routine re-entered recursively
2015-09-28 10:45:26.232+0000: shutting down
(END)