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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1820125

Title:
  Libvirt driver ungracefully explodes if unsupported arch is found

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) rocky series:
  New

Bug description:
  If a new libvirt exposes an arch name that nova does not support, we
  fail to gracefully skip it during the instance capability gathering:

  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager [req-4e626631-fefc-4c58-a1cd-5207c9384a1b - - - - -] Error updating resources for node primary.: InvalidArchitectureName: Architecture name 'armv6l' is not recognised
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager Traceback (most recent call last):
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager   File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/compute/manager.py", line 7956, in _update_available_resource_for_node
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager     startup=startup)
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager   File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/compute/resource_tracker.py", line 727, in update_available_resource
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager     resources = self.driver.get_available_resource(nodename)
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager   File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 7070, in get_available_resource
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager     data["supported_instances"] = self._get_instance_capabilities()
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager   File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5943, in _get_instance_capabilities
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager     fields.Architecture.canonicalize(g.arch),
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager   File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/objects/fields.py", line 200, in canonicalize
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager     raise exception.InvalidArchitectureName(arch=name)
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager InvalidArchitectureName: Architecture name 'armv6l' is not recognised
  2019-03-14 19:11:31.709 6 ERROR nova.compute.manager

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