Unexpected error while running command `blkid overlay -s UUID -o value`

Issue

• When creating volumes or creating guests, we see the following error in /var/log/containers/cinder/cinder-volume.log on the controllers and /var/log/containers/nova/nova-compute.log on the compute nodes:

Command: blkid overlay -s UUID -o value
Exit code: 2
Stdout: ''
Stderr: '' _process_cmd /usr/lib/python3.9/site-packages/oslo_privsep/daemon.py:490
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/oslo_privsep/daemon.py", line 487, in _process_cmd
    ret = func(*f_args, **f_kwargs)
  File "/usr/lib/python3.9/site-packages/oslo_privsep/priv_context.py", line 255, in _wrap
    return func(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/os_brick/privileged/rootwrap.py", line 197, in execute_root
    return custom_execute(*cmd, shell=False, run_as_root=False, **kwargs)
  File "/usr/lib/python3.9/site-packages/os_brick/privileged/rootwrap.py", line 145, in custom_execute
    return putils.execute(on_execute=on_execute,
  File "/usr/lib/python3.9/site-packages/oslo_concurrency/processutils.py", line 438, in execute
    raise ProcessExecutionError(exit_code=_returncode,
oslo_concurrency.processutils.ProcessExecutionError: Unexpected error while running command.
Command: blkid overlay -s UUID -o value
Exit code: 2

• We suspect this is caused by a known OpenStack os-brick bug: fixed upstream in versions 6.2.4, 6.4.2, 6.7.1, and newer.