Hi, 
While running stack on latest devstack, ended up with the following error message:
 
+functions-common:time_stop:2325           _TIME_START[$name]=
+functions-common:time_stop:2326           _TIME_TOTAL[$name]=75421
+functions:wait_for_compute:493            [[ 124 != 0 ]]
+functions:wait_for_compute:494            echo 'Didn'\''t find service registered by hostname after 60 seconds'
Didn't find service registered by hostname after 60 seconds
+functions:wait_for_compute:495            openstack --os-cloud devstack-admin --os-region RegionOne compute service list
+----+----------------+--------+----------+---------+-------+----------------------------+
| ID | Binary         | Host   | Zone     | Status  | State | Updated At                 |
+----+----------------+--------+----------+---------+-------+----------------------------+
|  1 | nova-conductor | ubuntu | internal | enabled | up    | 2021-10-26T11:14:49.000000 |
|  2 | nova-scheduler | ubuntu | internal | enabled | up    | 2021-10-26T11:14:50.000000 |
|  4 | nova-conductor | ubuntu | internal | enabled | up    | 2021-10-26T11:14:57.000000 |
+----+----------------+--------+----------+---------+-------+----------------------------+
 
From nova-logs, got the below message:
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service Traceback (most recent call last):
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service   File "/usr/local/lib/python3.8/dist-packages/oslo_service/service.py", line 806, in run_service
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service     service.start()
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service   File "/opt/stack/nova/nova/service.py", line 159, in start
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service     self.manager.init_host()
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service   File "/opt/stack/nova/nova/compute/manager.py", line 1416, in init_host
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service     self.driver.init_host(host=self.host)
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 802, in init_host
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service     self._check_cpu_compatibility()
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 896, in _check_cpu_compatibility
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service     raise exception.InvalidCPUInfo(msg)
Oct 26 16:36:49 ubuntu nova-compute[337228]: ERROR oslo_service.service nova.exception.InvalidCPUInfo: Configured CPU model: Nehalem is not compatible with host CPU. Please correct your config and try again. Unacceptable CPU info: CPU doesn't have compatibility.
 
A week ago, the stack was successful and it is failing now. Is there any significant change merged to master or something I am missing(Following the same instructions as ever).
 
It would be really great if someone give a quick solution. Thanks in adv
 
Thanks & Regards
Venkata Krishna