[Qemu-devel] Guest init virtio-serial port failed randomly， qemu-kvm report error about guest failure in adding device virtio-serial0.0

[皮智]

Hi，I meet a problem with vm(windows10), my environment is qemu-kvm-2.3,
virtio-win-0.1.126, host(centos7.2), guest(windows10).
I add four virtio-serial port to vm, if I hard reboot the vm(windows10), it
may happen as follows randomly:

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

If qemu-kvm report upper error, it will cause guest failed to init
virtio-serial port.
Thanks.

Looking forward to your reply.