** Description changed:

  Description:-
  
  So while testing python3 with Fedora in [1], Found an issue while
  running nova-api behind wsgi. It fails with below Traceback:-
  
  2018-12-18 07:41:55.364 26870 INFO nova.api.openstack.requestlog 
[req-e1af4808-ecd8-47c7-9568-a5dd9691c2c9 - - - - -] 127.0.0.1 "GET 
/v2.1/servers/detail?all_tenants=True&deleted=True" status: 500 len: 0 
microversion: - time: 0.007297
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack 
[req-e1af4808-ecd8-47c7-9568-a5dd9691c2c9 - - - - -] Caught error: maximum 
recursion depth exceeded while calling a Python object: RecursionError: maximum 
recursion depth exceeded while calling a Python object
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack Traceback (most recent 
call last):
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/nova/api/openstack/__init__.py", line 94, in 
__call__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     return 
req.get_response(self.application)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/request.py", line 1313, in send
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     application, 
catch_exc_info=False)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/request.py", line 1277, in 
call_application
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     app_iter = 
application(self.environ, start_response)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/dec.py", line 129, in __call__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     resp = 
self.call_func(req, *args, **kw)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/dec.py", line 193, in call_func
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     return 
self.func(req, *args, **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/nova/api/openstack/requestlog.py", line 92, 
in __call__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     self._log_req(req, 
res, start)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
self.force_reraise()
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in 
force_reraise
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
six.reraise(self.type_, self.value, self.tb)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/six.py", line 693, in reraise
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     raise value
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/nova/api/openstack/requestlog.py", line 87, 
in __call__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     res = 
req.get_response(self.application)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/request.py", line 1313, in send
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     application, 
catch_exc_info=False)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/request.py", line 1277, in 
call_application
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     app_iter = 
application(self.environ, start_response)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/dec.py", line 143, in __call__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     return 
resp(environ, start_response)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/dec.py", line 129, in __call__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     resp = 
self.call_func(req, *args, **kw)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/dec.py", line 193, in call_func
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     return 
self.func(req, *args, **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/osprofiler/web.py", line 112, in __call__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     return 
request.get_response(self.application)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/request.py", line 1313, in send
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     application, 
catch_exc_info=False)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/request.py", line 1277, in 
call_application
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     app_iter = 
application(self.environ, start_response)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/dec.py", line 129, in __call__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     resp = 
self.call_func(req, *args, **kw)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/webob/dec.py", line 193, in call_func
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     return 
self.func(req, *args, **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystonemiddleware/auth_token/__init__.py", 
line 332, in __call__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     response = 
self.process_request(req)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystonemiddleware/auth_token/__init__.py", 
line 622, in process_request
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     resp = 
super(AuthProtocol, self).process_request(request)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystonemiddleware/auth_token/__init__.py", 
line 405, in process_request
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
allow_expired=allow_expired)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystonemiddleware/auth_token/__init__.py", 
line 437, in _do_fetch_token
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     data = 
self.fetch_token(token, **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystonemiddleware/auth_token/__init__.py", 
line 761, in fetch_token
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
allow_expired=allow_expired)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystonemiddleware/auth_token/_identity.py", 
line 219, in verify_token
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     auth_ref = 
self._request_strategy.verify_token(
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystonemiddleware/auth_token/_identity.py", 
line 170, in _request_strategy
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     strategy_class = 
self._get_strategy_class()
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystonemiddleware/auth_token/_identity.py", 
line 192, in _get_strategy_class
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     if 
self._adapter.get_endpoint(version=klass.AUTH_VERSION):
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/adapter.py", line 247, in 
get_endpoint
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     return 
self.session.get_endpoint(auth or self.auth, **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/session.py", line 1113, in 
get_endpoint
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     return 
auth.get_endpoint(self, **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/identity/base.py", line 380, in 
get_endpoint
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
allow_version_hack=allow_version_hack, **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/identity/base.py", line 271, in 
get_endpoint_data
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     service_catalog = 
self.get_access(session).service_catalog
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/identity/base.py", line 134, in 
get_access
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     self.auth_ref = 
self.get_auth_ref(session)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/identity/generic/base.py", line 
206, in get_auth_ref
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     self._plugin = 
self._do_create_plugin(session)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/identity/generic/base.py", line 
138, in _do_create_plugin
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
authenticated=False)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/identity/base.py", line 610, in 
get_discovery
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
authenticated=authenticated)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/discover.py", line 1442, in 
get_discovery
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     disc = 
Discover(session, url, authenticated=authenticated)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/discover.py", line 526, in 
__init__
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
authenticated=authenticated)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/discover.py", line 101, in 
get_version_data
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     resp = 
session.get(url, headers=headers, authenticated=authenticated)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/session.py", line 1011, in get
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     return 
self.request(url, 'GET', **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/session.py", line 814, in 
request
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     resp = 
send(**kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/keystoneauth1/session.py", line 903, in 
_send_request
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     resp = 
self.session.request(method, url, **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/requests/sessions.py", line 524, in request
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     resp = 
self.send(prep, **send_kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/requests/sessions.py", line 637, in send
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     r = 
adapter.send(request, **kwargs)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/requests/adapters.py", line 449, in send
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     timeout=timeout
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/urllib3/connectionpool.py", line 600, in 
urlopen
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     chunked=chunked)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/urllib3/connectionpool.py", line 343, in 
_make_request
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
self._validate_conn(conn)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/urllib3/connectionpool.py", line 839, in 
_validate_conn
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     conn.connect()
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/urllib3/connection.py", line 332, in connect
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     
cert_reqs=resolve_cert_reqs(self.cert_reqs),
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib/python3.6/site-packages/urllib3/util/ssl_.py", line 281, in 
create_urllib3_context
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     context.options |= 
options
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib64/python3.6/ssl.py", line 423, in options
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     super(SSLContext, 
SSLContext).options.__set__(self, value)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib64/python3.6/ssl.py", line 423, in options
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     super(SSLContext, 
SSLContext).options.__set__(self, value)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   File 
"/usr/lib64/python3.6/ssl.py", line 423, in options
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack     super(SSLContext, 
SSLContext).options.__set__(self, value)
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack   [Previous line 
repeated 280 more times]
  2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack RecursionError: 
maximum recursion depth exceeded while calling a Python object
- 2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack 
+ 2018-12-18 07:41:55.364 26870 ERROR nova.api.openstack
  2018-12-18 07:41:55.371 26870 INFO nova.api.openstack 
[req-e1af4808-ecd8-47c7-9568-a5dd9691c2c9 - - - - -] 
https://127.0.0.1:8774/v2.1/servers/detail?all_tenants=True&deleted=True 
returned with HTTP 500
- 
  
  Environment Details:-
  OS: Fedora 28
  python: 3.6.7
  eventlet: 0.24.1
  
- 
- The issue is around using of eventlet.monkey_patch even if running under 
wsgi[2]. Eventlet Best practices suggest to not run(skip) monkey_patch when 
running behind wsgi[3] but with nova it's not the case.
+ The issue is around using of eventlet.monkey_patch even if running under
+ wsgi[2]. Eventlet Best practices suggest to not run(skip) monkey_patch
+ when running behind wsgi[3] but with nova it's not the case.
  
  Expected result
  ===============
  Nova api should response successfully.
  
  Actual result
  =============
  Nova api returns Recursion Error.
  
- 
  [1] https://review.openstack.org/#/c/620561/
  [2] 
https://github.com/openstack/nova/blob/a674241d0f026b546b38ec77ab472e916805c679/nova/api/openstack/wsgi_app.py#L32
  [3] 
https://review.openstack.org/#/c/154642/2/specs/eventlet-best-practices.rst@54
+ 
+ 
+ -------------------------------------------------------------
+ 
+ Ubuntu SRU Details
+ 
+ [Impact]
+ Please see description above.
+ 
+ [Test Case]
+ 
+ [Regression Potential]
+ There is certainly regression potential with this patch as it is not a 
trivial change. The patch has landed in the upstream master branch which is now 
train, which means it has received iterative reviews and final approval from 
upstream reviewers and passed gate testing. The patch has not yet landed in the 
upstream stable/stein but does have one core reviewer's +2 and has passed zuul 
tests with a +1. The patch has been tested locally and confirmed to fix 
nova+wsgi+py3+SSL in initial Ubuntu testing. Without this change that 
combination is broken for Ubuntu Stein.

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https://bugs.launchpad.net/bugs/1808951

Title:
  python3 + Fedora + SSL + wsgi nova deployment, nova api returns
  RecursionError: maximum recursion depth exceeded while calling a
  Python object

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