Instance creation fails with error "Failed to bind socket to /var/run/openvswitch/vhuce264a4d-20: Permission denied"

Issue

• Evaluating the nova-compute logs on the compute node, the request fails with an error mentioned below.

  2021-07-31 04:43:34.543 7 ERROR nova.compute.manager [req-9a35bad0-0793-4ed8-8803-660e8fcc9b03 087bf2bcee5045aaa09c128c32038853 ef1ce0af949c467da9d376984fbc20b8 - default default] [instance: 46df9abf-80ad-4477-8cde-b670be0d3fea] Instance failed to spawn: libvirt.libvirtError: internal error: process exited while connecting to monitor: 2021-07-31T04:43:34.302286Z qemu-kvm: -chardev socket,id=charnet0,path=/var/run/openvswitch/vhuce264a4d-20,server: Failed to bind socket to /var/run/openvswitch/vhuce264a4d-20: Permission denied
  2021-07-31 04:43:34.543 7 ERROR nova.compute.manager [instance: 46df9abf-80ad-4477-8cde-b670be0d3fea] Traceback (most recent call last):
  2021-07-31 04:43:34.543 7 ERROR nova.compute.manager [instance: 46df9abf-80ad-4477-8cde-b670be0d3fea]   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 2668, in _build_resources
  2021-07-31 04:43:34.543 7 ERROR nova.compute.manager [instance: 46df9abf-80ad-4477-8cde-b670be0d3fea]     yield resources
  
  [...]
  
  2021-07-31 04:43:34.543 7 ERROR nova.compute.manager [instance: 46df9abf-80ad-4477-8cde-b670be0d3fea]   File "/usr/lib64/python3.6/site-packages/libvirt.py", line 1265, in createWithFlags
  2021-07-31 04:43:34.543 7 ERROR nova.compute.manager [instance: 46df9abf-80ad-4477-8cde-b670be0d3fea]     if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
  2021-07-31 04:43:34.543 7 ERROR nova.compute.manager [instance: 46df9abf-80ad-4477-8cde-b670be0d3fea] libvirt.libvirtError: internal error: process exited while connecting to monitor: 2021-07-31T04:43:34.302286Z qemu-kvm: -chardev socket,id=charnet0,path=/var/run/openvswitch/vhuce264a4d-20,server: Failed to bind socket to /var/run/openvswitch/vhuce264a4d-20: Permission denied