> @cpaelzer, if you have any suggestions for specific tests/configurations
> that might be good to test the specific code changed here, please let me
> know.

I have ran the few test that would cover that area in the past on PPAs already.
Unfortunately this is a very specific path and I don't have much more
tests for it.

If anything comes to my mind it would be loops of attaching/detaching
extra interfaces to guests and try some traffic on them.
And every now and then in between supend/resume the or shutdown/start
the guest again.
Like:
repeat forever
   start or resume
        repeat ~20 times
          add network device
          check network device to work
   shutdown or suspend
This should cover a lot of paths that your change might have affected.
/me hopes that indents will be retained by LP

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https://bugs.launchpad.net/bugs/1823458

Title:
  race condition between vhost_net_stop and CHR_EVENT_CLOSED on shutdown
  crashes qemu

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