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[Bug 1381536] [NEW] ResourceClosedError occurs when create_port from DHCP agent and create_port from neutron API run in parallel

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Ian Ong <ongmichaelian@xxxxxxxxx>
Date: Wed, 15 Oct 2014 13:38:48 -0000
Reply-to: Bug 1381536 <1381536@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

When DHCP agent creates port from neutron and another create port
request is received, ResourceClosedError occurs in sqlalchemy.

this may be related to bug #1282922 https://bugs.launchpad.net/bugs/1282922
Above bug is related to nec plugin and it is mentioned that other plugins may be affected.
This error occurred in ML2 plugin both for create and delete ports.
Tested using 2014.3 Icehouse

==========================================================================
2014-10-15 21:58:59.837 26167 INFO neutron.wsgi [-] (26167) accepted ('172.16.2.86', 47007)

2014-10-15 21:58:59.870 26167 INFO neutron.wsgi [req-424a01ca-f52b-
43a6-8844-d0d3590feb8d None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "GET
/v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.031936

2014-10-15 21:58:59.872 26167 INFO neutron.wsgi [req-424a01ca-f52b-
43a6-8844-d0d3590feb8d None] (26167) accepted ('172.16.2.86', 47008)

2014-10-15 21:58:59.950 26167 INFO neutron.wsgi [req-7ee742ef-6370-46b3
-8f8b-f46ae5d262bc None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "POST
/v2.0/subnets.json HTTP/1.1" 201 572 0.076879

2014-10-15 21:59:00.074 26167 INFO neutron.wsgi [req-a6ef6c65-811f-
40d8-9443-b9590809994a None] (26167) accepted ('172.16.2.86', 47010)

2014-10-15 21:59:00.088 26167 INFO urllib3.connectionpool [-] Starting new HTTPS connection (1): 10.68.42.86
2014-10-15 21:59:00.111 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-bb7b-b4c7e2e6e08c None] 172.16.2.86 - - [15/Oct/2014 21:59:00] "GET /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.033298

2014-10-15 21:59:00.113 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-
bb7b-b4c7e2e6e08c None] (26167) accepted ('172.16.2.86', 47012)

2014-10-15 21:59:51.165 26167 ERROR neutron.api.v2.resource [-] create failed
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource Traceback (most recent call last):
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/resource.py", line 87, in resource
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = method(request=request, **args)
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/base.py", line 448, in create
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     obj = obj_creator(request.context, **kwargs)
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 632, in create_port
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = super(Ml2Plugin, self).create_port(context, port)
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 1371, in create_port
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ips = self._allocate_ips_for_port(context, network, port)
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 678, in _allocate_ips_for_port
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = NeutronDbPluginV2._generate_ip(context, subnets)
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 359, in _generate_ip
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return NeutronDbPluginV2._try_generate_ip(context, subnets)
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 376, in _try_generate_ip
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     range = range_qry.filter_by(subnet_id=subnet['id']).first()
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2282, in first
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ret = list(self[0:1])
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2149, in __getitem__
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return list(res)
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/loading.py", line 65, in instances
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     fetch = cursor.fetchall()
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 752, in fetchall
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self.cursor, self.context)
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1027, in _handle_dbapi_exception
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     util.reraise(*exc_info)
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 746, in fetchall
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     l = self.process_rows(self._fetchall_impl())
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 715, in _fetchall_impl
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self._non_result()
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 720, in _non_result
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     "This result object does not return rows. "
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource ResourceClosedError: This result object does not return rows. It has been closed automatically.
2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource
2014-10-15 21:59:51.167 26167 INFO neutron.wsgi [-] 172.16.2.86 - - [15/Oct/2014 21:59:51] "POST /v2.0/ports.json HTTP/1.1" 500 296 51.052950
==========================================================================

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: ml2 neutron-core

** Description changed:

  When DHCP agent creates port from neutron and another create port
  request is received, ResourceClosedError occurs in sqlalchemy.
  
  this may be related to bug #1282922 https://bugs.launchpad.net/bugs/1282922
  Above bug is related to nec plugin and it is mentioned that other plugins may be affected.
  This error occurred in ML2 plugin both for create and delete ports.
  Tested using 2014.3 Icehouse
  
+    Neutron User          Neutron            DHCP Agent
+        |                    |                    |
+        |                    |  DHCP VPort        |
+        |                    |  Create Port Req   |
+        |                    |<-------------------|
+        | VPort              |                    |
+        | Create Port Req    |                    |
+        |------------------->|                    |
+        |                    |* Conflict          |
+        |                    |                    |
+        |                    |                    |
+        |                    |  Create Port Resp  |
+        |                    |------------------->|
+        | Create Port Resp   |                    |
+        | *Error Response    |                    |
+        |<-------------------|                    |
+        |                    |                    |
+        |                    |                    |
  
-    Neutron User          Neutron            DHCP Agent
-        |                    |                    |
-        |                    |  DHCP VPort        |
-        |                    |  Create Port Req   |
-        |                    |<-------------------|
-        | VPort              |                    |
-        | Create Port Req    |                    |
-        |------------------->|                    |
-        |                    |* Conflict          |
-        |                    |                    |
-        |                    |                    |
-        |                    |  Create Port Resp  |
-        |                    |------------------->|
-        | Create Port Resp   |                    |
-        | *Error Response    |                    |
-        |<-------------------|                    |
-        |                    |                    |
-        |                    |                    |
- 
- 
- 2014-10-15 21:58:59.837 26167 INFO neutron.wsgi [-] (26167) accepted ('172.16.2.86', 47007)
+ 2014-10-15 21:58:59.837 26167 INFO neutron.wsgi [-] (26167) accepted
+ ('172.16.2.86', 47007)
  
  2014-10-15 21:58:59.870 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "GET
  /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.031936
  
  2014-10-15 21:58:59.872 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] (26167) accepted ('172.16.2.86', 47008)
  
  2014-10-15 21:58:59.950 26167 INFO neutron.wsgi [req-7ee742ef-6370-46b3
  -8f8b-f46ae5d262bc None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "POST
  /v2.0/subnets.json HTTP/1.1" 201 572 0.076879
  
  2014-10-15 21:59:00.074 26167 INFO neutron.wsgi [req-a6ef6c65-811f-
  40d8-9443-b9590809994a None] (26167) accepted ('172.16.2.86', 47010)
  
  2014-10-15 21:59:00.088 26167 INFO urllib3.connectionpool [-] Starting new HTTPS connection (1): 10.68.42.86
  2014-10-15 21:59:00.111 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-bb7b-b4c7e2e6e08c None] 172.16.2.86 - - [15/Oct/2014 21:59:00] "GET /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.033298
  
  2014-10-15 21:59:00.113 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-
  bb7b-b4c7e2e6e08c None] (26167) accepted ('172.16.2.86', 47012)
  
  2014-10-15 21:59:51.165 26167 ERROR neutron.api.v2.resource [-] create failed
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/resource.py", line 87, in resource
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/base.py", line 448, in create
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     obj = obj_creator(request.context, **kwargs)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 632, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = super(Ml2Plugin, self).create_port(context, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 1371, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ips = self._allocate_ips_for_port(context, network, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 678, in _allocate_ips_for_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = NeutronDbPluginV2._generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 359, in _generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return NeutronDbPluginV2._try_generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 376, in _try_generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     range = range_qry.filter_by(subnet_id=subnet['id']).first()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2282, in first
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ret = list(self[0:1])
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2149, in __getitem__
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return list(res)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/loading.py", line 65, in instances
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     fetch = cursor.fetchall()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 752, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self.cursor, self.context)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1027, in _handle_dbapi_exception
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     util.reraise(*exc_info)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 746, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     l = self.process_rows(self._fetchall_impl())
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 715, in _fetchall_impl
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self._non_result()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 720, in _non_result
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     "This result object does not return rows. "
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource ResourceClosedError: This result object does not return rows. It has been closed automatically.
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource
  2014-10-15 21:59:51.167 26167 INFO neutron.wsgi [-] 172.16.2.86 - - [15/Oct/2014 21:59:51] "POST /v2.0/ports.json HTTP/1.1" 500 296 51.052950

** Description changed:

  When DHCP agent creates port from neutron and another create port
  request is received, ResourceClosedError occurs in sqlalchemy.
  
  this may be related to bug #1282922 https://bugs.launchpad.net/bugs/1282922
  Above bug is related to nec plugin and it is mentioned that other plugins may be affected.
  This error occurred in ML2 plugin both for create and delete ports.
  Tested using 2014.3 Icehouse
  
-    Neutron User          Neutron            DHCP Agent
-        |                    |                    |
-        |                    |  DHCP VPort        |
-        |                    |  Create Port Req   |
-        |                    |<-------------------|
-        | VPort              |                    |
-        | Create Port Req    |                    |
-        |------------------->|                    |
-        |                    |* Conflict          |
-        |                    |                    |
-        |                    |                    |
-        |                    |  Create Port Resp  |
-        |                    |------------------->|
-        | Create Port Resp   |                    |
-        | *Error Response    |                    |
-        |<-------------------|                    |
-        |                    |                    |
-        |                    |                    |
  
  2014-10-15 21:58:59.837 26167 INFO neutron.wsgi [-] (26167) accepted
  ('172.16.2.86', 47007)
  
  2014-10-15 21:58:59.870 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "GET
  /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.031936
  
  2014-10-15 21:58:59.872 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] (26167) accepted ('172.16.2.86', 47008)
  
  2014-10-15 21:58:59.950 26167 INFO neutron.wsgi [req-7ee742ef-6370-46b3
  -8f8b-f46ae5d262bc None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "POST
  /v2.0/subnets.json HTTP/1.1" 201 572 0.076879
  
  2014-10-15 21:59:00.074 26167 INFO neutron.wsgi [req-a6ef6c65-811f-
  40d8-9443-b9590809994a None] (26167) accepted ('172.16.2.86', 47010)
  
  2014-10-15 21:59:00.088 26167 INFO urllib3.connectionpool [-] Starting new HTTPS connection (1): 10.68.42.86
  2014-10-15 21:59:00.111 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-bb7b-b4c7e2e6e08c None] 172.16.2.86 - - [15/Oct/2014 21:59:00] "GET /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.033298
  
  2014-10-15 21:59:00.113 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-
  bb7b-b4c7e2e6e08c None] (26167) accepted ('172.16.2.86', 47012)
  
  2014-10-15 21:59:51.165 26167 ERROR neutron.api.v2.resource [-] create failed
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/resource.py", line 87, in resource
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/base.py", line 448, in create
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     obj = obj_creator(request.context, **kwargs)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 632, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = super(Ml2Plugin, self).create_port(context, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 1371, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ips = self._allocate_ips_for_port(context, network, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 678, in _allocate_ips_for_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = NeutronDbPluginV2._generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 359, in _generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return NeutronDbPluginV2._try_generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 376, in _try_generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     range = range_qry.filter_by(subnet_id=subnet['id']).first()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2282, in first
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ret = list(self[0:1])
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2149, in __getitem__
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return list(res)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/loading.py", line 65, in instances
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     fetch = cursor.fetchall()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 752, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self.cursor, self.context)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1027, in _handle_dbapi_exception
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     util.reraise(*exc_info)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 746, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     l = self.process_rows(self._fetchall_impl())
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 715, in _fetchall_impl
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self._non_result()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 720, in _non_result
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     "This result object does not return rows. "
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource ResourceClosedError: This result object does not return rows. It has been closed automatically.
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource
  2014-10-15 21:59:51.167 26167 INFO neutron.wsgi [-] 172.16.2.86 - - [15/Oct/2014 21:59:51] "POST /v2.0/ports.json HTTP/1.1" 500 296 51.052950

** Description changed:

  When DHCP agent creates port from neutron and another create port
  request is received, ResourceClosedError occurs in sqlalchemy.
  
  this may be related to bug #1282922 https://bugs.launchpad.net/bugs/1282922
  Above bug is related to nec plugin and it is mentioned that other plugins may be affected.
  This error occurred in ML2 plugin both for create and delete ports.
  Tested using 2014.3 Icehouse
  
  
- 2014-10-15 21:58:59.837 26167 INFO neutron.wsgi [-] (26167) accepted
- ('172.16.2.86', 47007)
+ 
+ 2014-10-15 21:58:59.837 26167 INFO neutron.wsgi [-] (26167) accepted ('172.16.2.86', 47007)
  
  2014-10-15 21:58:59.870 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "GET
  /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.031936
  
  2014-10-15 21:58:59.872 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] (26167) accepted ('172.16.2.86', 47008)
  
  2014-10-15 21:58:59.950 26167 INFO neutron.wsgi [req-7ee742ef-6370-46b3
  -8f8b-f46ae5d262bc None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "POST
  /v2.0/subnets.json HTTP/1.1" 201 572 0.076879
  
  2014-10-15 21:59:00.074 26167 INFO neutron.wsgi [req-a6ef6c65-811f-
  40d8-9443-b9590809994a None] (26167) accepted ('172.16.2.86', 47010)
  
  2014-10-15 21:59:00.088 26167 INFO urllib3.connectionpool [-] Starting new HTTPS connection (1): 10.68.42.86
  2014-10-15 21:59:00.111 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-bb7b-b4c7e2e6e08c None] 172.16.2.86 - - [15/Oct/2014 21:59:00] "GET /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.033298
  
  2014-10-15 21:59:00.113 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-
  bb7b-b4c7e2e6e08c None] (26167) accepted ('172.16.2.86', 47012)
  
  2014-10-15 21:59:51.165 26167 ERROR neutron.api.v2.resource [-] create failed
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/resource.py", line 87, in resource
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/base.py", line 448, in create
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     obj = obj_creator(request.context, **kwargs)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 632, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = super(Ml2Plugin, self).create_port(context, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 1371, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ips = self._allocate_ips_for_port(context, network, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 678, in _allocate_ips_for_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = NeutronDbPluginV2._generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 359, in _generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return NeutronDbPluginV2._try_generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 376, in _try_generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     range = range_qry.filter_by(subnet_id=subnet['id']).first()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2282, in first
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ret = list(self[0:1])
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2149, in __getitem__
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return list(res)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/loading.py", line 65, in instances
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     fetch = cursor.fetchall()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 752, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self.cursor, self.context)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1027, in _handle_dbapi_exception
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     util.reraise(*exc_info)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 746, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     l = self.process_rows(self._fetchall_impl())
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 715, in _fetchall_impl
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self._non_result()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 720, in _non_result
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     "This result object does not return rows. "
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource ResourceClosedError: This result object does not return rows. It has been closed automatically.
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource
  2014-10-15 21:59:51.167 26167 INFO neutron.wsgi [-] 172.16.2.86 - - [15/Oct/2014 21:59:51] "POST /v2.0/ports.json HTTP/1.1" 500 296 51.052950

** Description changed:

  When DHCP agent creates port from neutron and another create port
  request is received, ResourceClosedError occurs in sqlalchemy.
  
  this may be related to bug #1282922 https://bugs.launchpad.net/bugs/1282922
  Above bug is related to nec plugin and it is mentioned that other plugins may be affected.
  This error occurred in ML2 plugin both for create and delete ports.
  Tested using 2014.3 Icehouse
  
- 
- 
+ ==========================================================================
  2014-10-15 21:58:59.837 26167 INFO neutron.wsgi [-] (26167) accepted ('172.16.2.86', 47007)
  
  2014-10-15 21:58:59.870 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "GET
  /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.031936
  
  2014-10-15 21:58:59.872 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] (26167) accepted ('172.16.2.86', 47008)
  
  2014-10-15 21:58:59.950 26167 INFO neutron.wsgi [req-7ee742ef-6370-46b3
  -8f8b-f46ae5d262bc None] 172.16.2.86 - - [15/Oct/2014 21:58:59] "POST
  /v2.0/subnets.json HTTP/1.1" 201 572 0.076879
  
  2014-10-15 21:59:00.074 26167 INFO neutron.wsgi [req-a6ef6c65-811f-
  40d8-9443-b9590809994a None] (26167) accepted ('172.16.2.86', 47010)
  
  2014-10-15 21:59:00.088 26167 INFO urllib3.connectionpool [-] Starting new HTTPS connection (1): 10.68.42.86
  2014-10-15 21:59:00.111 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-bb7b-b4c7e2e6e08c None] 172.16.2.86 - - [15/Oct/2014 21:59:00] "GET /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.033298
  
  2014-10-15 21:59:00.113 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-
  bb7b-b4c7e2e6e08c None] (26167) accepted ('172.16.2.86', 47012)
  
  2014-10-15 21:59:51.165 26167 ERROR neutron.api.v2.resource [-] create failed
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/resource.py", line 87, in resource
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/base.py", line 448, in create
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     obj = obj_creator(request.context, **kwargs)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 632, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = super(Ml2Plugin, self).create_port(context, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 1371, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ips = self._allocate_ips_for_port(context, network, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 678, in _allocate_ips_for_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = NeutronDbPluginV2._generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 359, in _generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return NeutronDbPluginV2._try_generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 376, in _try_generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     range = range_qry.filter_by(subnet_id=subnet['id']).first()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2282, in first
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ret = list(self[0:1])
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2149, in __getitem__
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return list(res)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/loading.py", line 65, in instances
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     fetch = cursor.fetchall()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 752, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self.cursor, self.context)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1027, in _handle_dbapi_exception
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     util.reraise(*exc_info)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 746, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     l = self.process_rows(self._fetchall_impl())
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 715, in _fetchall_impl
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self._non_result()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 720, in _non_result
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     "This result object does not return rows. "
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource ResourceClosedError: This result object does not return rows. It has been closed automatically.
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource
  2014-10-15 21:59:51.167 26167 INFO neutron.wsgi [-] 172.16.2.86 - - [15/Oct/2014 21:59:51] "POST /v2.0/ports.json HTTP/1.1" 500 296 51.052950
+ ==========================================================================

-- 
You received this bug notification because you are a member of Yahoo!
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https://bugs.launchpad.net/bugs/1381536

Title:
  ResourceClosedError occurs when create_port from DHCP agent and
  create_port from neutron API run in parallel

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  When DHCP agent creates port from neutron and another create port
  request is received, ResourceClosedError occurs in sqlalchemy.

  this may be related to bug #1282922 https://bugs.launchpad.net/bugs/1282922
  Above bug is related to nec plugin and it is mentioned that other plugins may be affected.
  This error occurred in ML2 plugin both for create and delete ports.
  Tested using 2014.3 Icehouse

  ==========================================================================
  2014-10-15 21:58:59.837 26167 INFO neutron.wsgi [-] (26167) accepted ('172.16.2.86', 47007)

  2014-10-15 21:58:59.870 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] 172.16.2.86 - - [15/Oct/2014 21:58:59]
  "GET /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251
  0.031936

  2014-10-15 21:58:59.872 26167 INFO neutron.wsgi [req-424a01ca-f52b-
  43a6-8844-d0d3590feb8d None] (26167) accepted ('172.16.2.86', 47008)

  2014-10-15 21:58:59.950 26167 INFO neutron.wsgi [req-
  7ee742ef-6370-46b3-8f8b-f46ae5d262bc None] 172.16.2.86 - -
  [15/Oct/2014 21:58:59] "POST /v2.0/subnets.json HTTP/1.1" 201 572
  0.076879

  2014-10-15 21:59:00.074 26167 INFO neutron.wsgi [req-a6ef6c65-811f-
  40d8-9443-b9590809994a None] (26167) accepted ('172.16.2.86', 47010)

  2014-10-15 21:59:00.088 26167 INFO urllib3.connectionpool [-] Starting new HTTPS connection (1): 10.68.42.86
  2014-10-15 21:59:00.111 26167 INFO neutron.wsgi [req-22a84d34-f454-423d-bb7b-b4c7e2e6e08c None] 172.16.2.86 - - [15/Oct/2014 21:59:00] "GET /v2.0/networks.json?fields=id&name=testnw2 HTTP/1.1" 200 251 0.033298

  2014-10-15 21:59:00.113 26167 INFO neutron.wsgi [req-22a84d34-f454
  -423d-bb7b-b4c7e2e6e08c None] (26167) accepted ('172.16.2.86', 47012)

  2014-10-15 21:59:51.165 26167 ERROR neutron.api.v2.resource [-] create failed
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/resource.py", line 87, in resource
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/api/v2/base.py", line 448, in create
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     obj = obj_creator(request.context, **kwargs)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 632, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = super(Ml2Plugin, self).create_port(context, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 1371, in create_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ips = self._allocate_ips_for_port(context, network, port)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 678, in _allocate_ips_for_port
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     result = NeutronDbPluginV2._generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 359, in _generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return NeutronDbPluginV2._try_generate_ip(context, subnets)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 376, in _try_generate_ip
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     range = range_qry.filter_by(subnet_id=subnet['id']).first()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2282, in first
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     ret = list(self[0:1])
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/query.py", line 2149, in __getitem__
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     return list(res)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/loading.py", line 65, in instances
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     fetch = cursor.fetchall()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 752, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self.cursor, self.context)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1027, in _handle_dbapi_exception
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     util.reraise(*exc_info)
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 746, in fetchall
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     l = self.process_rows(self._fetchall_impl())
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 715, in _fetchall_impl
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     self._non_result()
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/result.py", line 720, in _non_result
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource     "This result object does not return rows. "
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource ResourceClosedError: This result object does not return rows. It has been closed automatically.
  2014-10-15 21:59:51.165 26167 TRACE neutron.api.v2.resource
  2014-10-15 21:59:51.167 26167 INFO neutron.wsgi [-] 172.16.2.86 - - [15/Oct/2014 21:59:51] "POST /v2.0/ports.json HTTP/1.1" 500 296 51.052950
  ==========================================================================

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Follow ups

[Bug 1381536] Re: ResourceClosedError occurs when neutron API run in parallel
From: Kyle Mestery, 2015-07-20
[Bug 1381536] [NEW] ResourceClosedError occurs when create_port from DHCP agent and create_port from neutron API run in parallel
From: Ian Ong, 2014-10-15
References

[Bug 1381536] [NEW] ResourceClosedError occurs when create_port from DHCP agent and create_port from neutron API run in parallel
From: Ian Ong, 2014-10-15