Not able to change flavor of the Instance due to CPUUnpinningInvalid Error

Issue

• When trying to change the flavor of the instance , during resize it fails at confirmResize with below error

  2023-03-23 17:52:20.732 7 ERROR nova.compute.manager [req-662a0871-727c-42db-8968-80e52b11e541 
  943315572a3ee0c854833a1e1a3cf97332c0ac59f873670e6689d675fd5d5372 a33d55a195f64405ab57a559937f9f02 - 
  86f870d46f274168808af9300534ac73 86f870d46f274168808af9300534ac73] [instance: ac59dfd6-2c94-4b68-8771- 
  fdbebf47aa38] Setting instance vm_state to ERROR: nova.exception.CPUUnpinningInvalid: CPU set to unpin [107, 51, 
  75, 19] must be a subset of pinned CPU set [7, 9, 11, 13, 21, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 
  55, 63, 65, 67, 69, 77, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 111]
  

• Instance goes into error state but the flavor gets changed to destination flavor

• Resize issue is also intermittent
• Customer have their own VNF Manager that manages the instance lifecycle , they change the flavor using their VNF Manager tool which communicates with Openstack via VIM Adapter.