Right now I do not think there is much choice to fix this (other than
not touch /dev/hpet on AWS). The linux kernel deliberately wants to set
a level triggered interrupt. The xen hypervisor has no support for that
(there might be some addition done but certainly not in any released
version of Xen). And as "error handling" forcefully crashes the domain.

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https://bugs.launchpad.net/bugs/1741409

Title:
  stress smoke test hang with dev test on AWS Xenial kernel

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