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[Stephen Finucane <sfinucan@xxxxxxxxxx>]

Public bug reported:

I'm seeing the following error locally:

Sep 12 18:52:25 compute-small nova-conductor[28968]: ERROR
nova.scheduler.utils [None req-b86b25c8-c89e-4449-bec3-c94948402e02 demo
admin] [instance: a4056430-ed06-4cea-91b9-e15fd4b1979f] Error from last
host: compute-small (node compute-small): [u'Traceback (most recent call
last):\n', u'  File "/opt/stack/nova/nova/compute/manager.py", line
2038, in _do_build_and_run_instance\n    filter_properties,
request_spec)\n', u'  File "/opt/stack/nova/nova/compute/manager.py",
line 2408, in _build_and_run_instance\n    instance_uuid=instance.uuid,
reason=six.text_type(e))\n', u"RescheduledException: Build of instance
a4056430-ed06-4cea-91b9-e15fd4b1979f was re-scheduled: No CPU model
match traits, models: ['IvyBridge-IBRS'], required flags:
set([None])\n"]

This is affecting me when testing the 'PCPU' feature because we're
rewriting the 'hw:cpu_thread_policy' to add a 'HW_CPU_HYPERTHREADING'
trait, however, this can happen with any non-CPU flag trait (e.g.
COMPUTE_SUPPORTS_MULTIATTACH) because of the following code:

https://github.com/openstack/nova/blob/7a18209a8/nova/virt/libvirt/utils.py#L600

That will mean we can return a set contains 'None', which causes this
later check to fail:

https://github.com/openstack/nova/blob/7a18209a81539217a95ab7daad6bc67002768950/nova/virt/libvirt/driver.py#L4083

Since no CPU model will report a 'None' feature flag.

** Affects: nova
     Importance: Undecided
     Assignee: Stephen Finucane (stephenfinucane)
         Status: In Progress


** Tags: libvirt

** Description changed:

  I'm seeing the following error locally:
  
  Sep 12 18:52:25 compute-small nova-conductor[28968]: ERROR
  nova.scheduler.utils [None req-b86b25c8-c89e-4449-bec3-c94948402e02 demo
  admin] [instance: a4056430-ed06-4cea-91b9-e15fd4b1979f] Error from last
  host: compute-small (node compute-small): [u'Traceback (most recent call
  last):\n', u'  File "/opt/stack/nova/nova/compute/manager.py", line
  2038, in _do_build_and_run_instance\n    filter_properties,
  request_spec)\n', u'  File "/opt/stack/nova/nova/compute/manager.py",
  line 2408, in _build_and_run_instance\n    instance_uuid=instance.uuid,
  reason=six.text_type(e))\n', u"RescheduledException: Build of instance
  a4056430-ed06-4cea-91b9-e15fd4b1979f was re-scheduled: No CPU model
  match traits, models: ['IvyBridge-IBRS'], required flags:
  set([None])\n"]
  
  This is affecting me when testing the 'PCPU' feature because we're
  rewriting the 'hw:cpu_thread_policy' to add a 'HW_CPU_HYPERTHREADING'
- trait, however, this can happen with any non-CPU flag trait because of
- the following code:
+ trait, however, this can happen with any non-CPU flag trait (e.g.
+ COMPUTE_SUPPORTS_MULTIATTACH) because of the following code:
  
  https://github.com/openstack/nova/blob/7a18209a8/nova/virt/libvirt/utils.py#L600
  
  That will mean we can return a set contains 'None', which causes this
  later check to fail:
  
  https://github.com/openstack/nova/blob/7a18209a81539217a95ab7daad6bc67002768950/nova/virt/libvirt/driver.py#L4083
  
  Since no CPU model will report a 'None' feature flag.

-- 
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https://bugs.launchpad.net/bugs/1843836

Title:
  Failure to schedule if flavor contains non-CPU flag traits

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  I'm seeing the following error locally:

  Sep 12 18:52:25 compute-small nova-conductor[28968]: ERROR
  nova.scheduler.utils [None req-b86b25c8-c89e-4449-bec3-c94948402e02
  demo admin] [instance: a4056430-ed06-4cea-91b9-e15fd4b1979f] Error
  from last host: compute-small (node compute-small): [u'Traceback (most
  recent call last):\n', u'  File
  "/opt/stack/nova/nova/compute/manager.py", line 2038, in
  _do_build_and_run_instance\n    filter_properties, request_spec)\n',
  u'  File "/opt/stack/nova/nova/compute/manager.py", line 2408, in
  _build_and_run_instance\n    instance_uuid=instance.uuid,
  reason=six.text_type(e))\n', u"RescheduledException: Build of instance
  a4056430-ed06-4cea-91b9-e15fd4b1979f was re-scheduled: No CPU model
  match traits, models: ['IvyBridge-IBRS'], required flags:
  set([None])\n"]

  This is affecting me when testing the 'PCPU' feature because we're
  rewriting the 'hw:cpu_thread_policy' to add a 'HW_CPU_HYPERTHREADING'
  trait, however, this can happen with any non-CPU flag trait (e.g.
  COMPUTE_SUPPORTS_MULTIATTACH) because of the following code:

  https://github.com/openstack/nova/blob/7a18209a8/nova/virt/libvirt/utils.py#L600

  That will mean we can return a set contains 'None', which causes this
  later check to fail:

  https://github.com/openstack/nova/blob/7a18209a81539217a95ab7daad6bc67002768950/nova/virt/libvirt/driver.py#L4083

  Since no CPU model will report a 'None' feature flag.

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