Open Stack

This is on a stable Stein Devstack. Problem description:

ubuntu at devstack:~$ oslopolicy-sample-generator --namespace keystone 
 >/etc/keystone/policy.json
ubuntu at devstack:~$ openstack user list
Internal Server Error (HTTP 500)

Note that I did not modify the policy.json file above. It's mere 
presence is sufficient to cause the problem. When I remove it and 
restart Keystone, the problem goes away.

The Keystone log contains a huge stacktrace with two methods in 
oslopolicy/_checks.py playing ping-pong with each other until they give 
up with RuntimeError: maximum recursion depth exceeded.

This only happens with Keystone. Nova and Cinder (which also keep policy 
in code) are fine.

This looks like a bug, but I didn't find it in launchpad. Is there a 
workaround? I would like to use a modified Keystone policy in a training 
course.

Thanks for any feedback.

Bernd.