Public bug reported:

Hello,

When upgrading from libvirt 1.3.1 (in Xenial) to libvirt 3.6.0 (in
Bionic), virtlogd is not restarted on upgrade. It seems libvirt is
unable to work with an old virtlogd. If not restarted, any spawned VM
will just hang the whole libvirtd process because libvirt is not able to
speak with virtlogd (one thread holds the lock in
virLogManagerDomainOpenLogFile/virNetClientProgramCall/virNetClientSendWithReply).
Nothing specific about that in the logs.

An easy way to test this is to just add Bionic sources to Xenial and
upgrade libvirt0 and libvirt-bin. After restarting virtlogd, everything
works as expected.

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1738834

Title:
  virtlogd should be restarted on upgrade

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