We also experienced the issue (it was readily reproducible in our case),
and the proposed 4.10-1ubuntu1.11 package appears to have resolved it.
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https://bugs.launchpad.net/bugs/2060880
For reference, the issue with the now backported patch was identified
upstream (https://lkml.org/lkml/2020/9/30/352), and the following patch
resolves it:
commit 0891fb39ba67bd7ae023ea0d367297010781
Author: Juergen Gross
Date: Wed Sep 30 11:16:14 2020 +0200
xen/events: don't use
