[CentOS-virt] live migration issues after libvirtd restart

Hi, All

There is following issue in latest libvirt-4.5.0-10.el7_6.12 package, which
could prevent live VM migrations with web sockets enabled, when libvirtd
were restarted prior to migration.

Environment:
# uname -a
Linux inv-cp1-hv3-centos7 3.10.0-957.12.2.el7.x86_64 #1 SMP Tue May 14
21:24:32 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

# rpm -qa | grep libvirt-4
libvirt-4.5.0-10.el7_6.12.x86_64

# rpm -qa | grep qemu-kvm
qemu-kvm-common-ev-2.12.0-18.el7_6.5.1.x86_64
qemu-kvm-ev-2.12.0-18.el7_6.5.1.x86_64
qemu-kvm-tools-ev-2.12.0-18.el7_6.5.1.x86_64


Repro steps:
1. start VM with following screen configuration:

<graphics type="vnc" listen="0.0.0.0" passwd="vnc_password" port="-1"
auto-port="yes" websocket="-1"/>


2. check VM XML (migratable):

#virsh dumpxml 1 > | grep vnc

<graphics type="vnc" listen="0.0.0.0" passwd="vnc_password" port="-1"
auto-port="yes" websocket="-1"/>


3. restart libvirtd

# systemctl restart libvirtd.service


4. check VM XML config again

#virsh dumpxml 1 > | grep vnc

<graphics type="vnc" listen="0.0.0.0" passwd="vnc_password" port="-1"
auto-port="yes" websocket="5700"/>


5. try to migrate this VM to hypervisor with already running VM and
you will get following error

error: internal error: Failed to reserve port 5700


It happens when on destination hypervisor there is VM running with web
socket port 5700.


This issue was fixed since libvirt-4.6.0 release.

I've retested it with libvirt-4.9.0 and libvirt-5.0.0 from
http://mirror.centos.org/centos/7/virt/x86_64/libvirt-latest/ repo.
And it actually fixed here.


Interesting to know when newer version of libvirt(at least 4.6.0 of
4.5.0 with fix) will be available in official centos updates repo?


Thanks a lot,

Oleksandr
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