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Hi，I meet a problem with vm, my environment is qemu-kvm-2.3,
virtio-win-0.1.126, host(centos7.2), guest(windows10).

libvirt xml has four virtio-serial channel as follows:
    <channel type='spicevmc'>
      <target type='virtio' name='com.redhat.spice.0' state='connected'/>
      <alias name='channel0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
    <channel type='unix'>
      <source mode='bind'
path='/var/lib/libvirt/qemu/e597eab9-95db-46e9-96f0-12a84c692569'/>
      <target type='virtio' name='pv-mon' state='connected'/>
      <alias name='channel1'/>
      <address type='virtio-serial' controller='0' bus='0' port='2'/>
    </channel>
    <channel type='unix'>
      <source mode='bind'
path='/var/lib/libvirt/qemu/e597eab9-95db-46e9-96f0-12a84c692569-qga'/>
      <target type='virtio' name='org.qemu.guest_agent.0'
state='connected'/>
      <alias name='channel2'/>
      <address type='virtio-serial' controller='0' bus='0' port='3'/>
    </channel>
    <channel type='unix'>
      <source mode='bind'
path='/var/lib/libvirt/qemu/e597eab9-95db-46e9-96f0-12a84c692569-report'/>
      <target type='virtio' name='qga-active-report' state='connected'/>
      <alias name='channel3'/>
      <address type='virtio-serial' controller='0' bus='0' port='4'/>
    </channel>

If I hard reboot the vm, it may happen as follows:

2017-08-14T07:51:18.401008Z qemu-kvm: virtio-serial-bus: Unexpected port id
1122983520 for device virtio-serial0.0
2017-08-14T07:51:18.956482Z qemu-kvm: virtio-serial-bus: Guest failure in
adding device virtio-serial0.0
2017-08-14T07:51:29.176795Z qemu-kvm: virtio-serial-bus: Guest failure in
adding device virtio-serial0.0
2017-08-14T07:51:34.454819Z qemu-kvm: virtio-serial-bus: Unexpected port id
2042451128 for device virtio-serial0.0
2017-08-14T07:51:44.655068Z qemu-kvm: virtio-serial-bus: Guest failure in
adding device virtio-serial0.0
2017-08-14T07:51:49.764201Z qemu-kvm: virtio-serial-bus: Unexpected port id
1122983520 for device virtio-serial0.0
2017-08-14T07:51:59.969836Z qemu-kvm: virtio-serial-bus: Guest failure in
adding device virtio-serial0.0
2017-08-14T07:52:21.564461Z qemu-kvm: virtio-serial-bus: Unexpected port id
1122983520 for device virtio-serial0.0
2017-08-14T07:52:47.059452Z qemu-kvm: virtio-serial-bus: Guest failure in
adding device virtio-serial0.0
2017-08-14T07:53:22.710677Z qemu-kvm: virtio-serial-bus: Unexpected port id
1122983520 for device virtio-serial0.0
2017-08-14T07:53:32.781204Z qemu-kvm: virtio-serial-bus: Guest failure in
adding device virtio-serial0.0
2017-08-14T07:53:48.040513Z qemu-kvm: virtio-serial-bus: Unexpected port id
3179968584 for device virtio-serial0.0
2017-08-14T07:54:23.547393Z qemu-kvm: virtio-serial-bus: Unexpected port id
1122983520 for device virtio-serial0.0
2017-08-14T07:55:54.350754Z qemu-kvm: virtio-serial-bus: Unexpected port id
1122983520 for device virtio-serial0.0
2017-08-14T07:56:09.393056Z qemu-kvm: virtio-serial-bus: Unexpected port id
1122983520 for device virtio-serial0.0
2017-08-14T07:57:39.670850Z qemu-kvm: virtio-serial-bus: Unexpected port id
1122983520 for device virtio-serial0.0
2017-08-14T07:58:09.867650Z qemu-kvm: virtio-serial-bus: Unexpected port id
1185792 for device virtio-serial0.0
2017-08-14T07:59:10.053208Z qemu-kvm: virtio-serial-bus: Unexpected port id
1122983520 for device virtio-serial0.0
2017-08-14T08:00:20.235162Z qemu-kvm: virtio-serial-bus: Guest failure in
adding device virtio-serial0.0
2017-08-14T08:01:20.394196Z qemu-kvm: virtio-serial-bus: Guest failure in
adding device virtio-serial0.0

So, the virtio-serial port will not be available, it cause my program
doesn't start in guest(windows10).
Can you give me some advices ?

Looking forward to your reply.