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[Dan Smith <2038840@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

If an operator configures cpu0 in the dedicated set and enables state
management, nova-compute will fail on startup with this obscure error:

Oct 06 20:08:43.195137 np0035436890 nova-compute[104711]: ERROR
oslo_service.service nova.exception.FileNotFound: File
/sys/devices/system/cpu/cpu0/online could not be found.

The problem is that cpu0 is not hot-pluggable and thus has no online
knob. Nova should log a better error message in this case, at least.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2038840

Title:
  CPU state management fails if cpu0 is in dedicated set

Status in OpenStack Compute (nova):
  New

Bug description:
  If an operator configures cpu0 in the dedicated set and enables state
  management, nova-compute will fail on startup with this obscure error:

  Oct 06 20:08:43.195137 np0035436890 nova-compute[104711]: ERROR
  oslo_service.service nova.exception.FileNotFound: File
  /sys/devices/system/cpu/cpu0/online could not be found.

  The problem is that cpu0 is not hot-pluggable and thus has no online
  knob. Nova should log a better error message in this case, at least.

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