This bug was fixed in the package qemu - 1:2.5+dfsg-5ubuntu10.37

---------------
qemu (1:2.5+dfsg-5ubuntu10.37) xenial; urgency=medium

  * d/p/lp1823458/add-VirtIONet-vhost_stopped-flag-to-prevent-multiple.patch,
    d/p/lp1823458/do-not-call-vhost_net_cleanup-on-running-net-from-ch.patch:
    - Prevent crash due to race condition on shutdown;
      this is fixed differently upstream (starting in Bionic), but
      the change is too large to backport into Xenial.  These two very
      small patches work around the problem in an unintrusive way.
      (LP: #1823458)

 -- Dan Streetman <[email protected]>  Tue, 23 Apr 2019 05:19:55
-0400

** Changed in: qemu (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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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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