[Bug 1894818] Re: COLO's guest VNC client hang after failover

[Derek Su]

Hi,

I also tested some emulated nic devices and virtio network devices (in
the attachment).

The VNC client's screen cannot be recovered while using all virtio
network devices and the emulated e1000e nic.

Thanks.

Regards,
Derek


** Attachment added: "截圖 2020-09-09 上午10.39.09.png"
   
https://bugs.launchpad.net/qemu/+bug/1894818/+attachment/5408894/+files/%E6%88%AA%E5%9C%96%202020-09-09%20%E4%B8%8A%E5%8D%8810.39.09.png

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https://bugs.launchpad.net/bugs/1894818

Title:
  COLO's guest VNC client hang after failover

Status in QEMU:
  New

Bug description:
  Hello,

  After setting up COLO's primary and secondary VMs,
  I installed the vncserver and xrdp (apt install tightvncserver xrdp) inside 
the VM.

  I access the VM from another PC via VNC/RDP client, and everything is OK.
  Then, kill the primary VM and issue the failover commands.

  The expected result is that the VNC/RDP client can reconnect and
  resume automatically after failover. (I've confirmed the VNC/RDP
  client can reconnect automatically.)

  But in my test, the VNC client's screen hangs and cannot be recovered
  no longer. I need to restart VNC client by myself.

  BTW, it works well after killing SVM.

  Here is my QEMU networking device
  ```
  -device virtio-net-pci,id=e0,netdev=hn0 \
  -netdev 
tap,id=hn0,br=br0,vhost=off,helper=/usr/local/libexec/qemu-bridge-helper \
  ```

  Thanks.

  Regards,
  Derek

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