[ stable/newton] Port creation failed with error "DBDuplicateEntry: (pymysql.err.IntegrityError)" on 100 concurrency

[stable/newton] Port creation failed with error "DBDuplicateEntry: (pymysql.err.IntegrityError)" on 100 concurrency

With stable/newton,executed below scenario with 100 concurrency and 500 iterations:

 -Create network, subnet
 -Create port (device_owner->compute:None)

For about 40 iterations, the scenario is failing with below error

"DBDuplicateEntry: (pymysql.err.IntegrityError) (1062, u"Duplicate entry '70.1.1.4-7005b2ac-9431-41f3-a59a-f6d19589b03c' for key 'PRIMARY'") [SQL: u'INSERT INTO ipamallocations (ip_address, status, ipam_subnet_id) VALUES (%(ip_address)s, %(status)s, %(ipam_subnet_id)s)'] [parameters: {'status': 'ALLOCATED', 'ip_address': '70.1.1.4', 'ipam_subnet_id': u'7005b2ac-9431-41f3-a59a-f6d19589b03c'}]"

I have attached the neutron.conf for your reference.

Neutron logs:

2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource [req-9cd01b4e-a770-4309-bd8c-987062cf4dde c_rally_94c739d9_QlP59G01 -] create failed: No details.
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource Traceback (most recent call last):
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/api/v2/resource.py", line 79, in resource
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource result = method(request=request, **args)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/api/v2/base.py", line 430, in create
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return self._create(request, body, **kwargs)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/api.py", line 88, in wrapped
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource setattr(e, '_RETRY_EXCEEDED', True)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.force_reraise()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/api.py", line 84, in wrapped
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return f(*args, **kwargs)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py", line 151, in wrapper
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource ectxt.value = e.inner_exc
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.force_reraise()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py", line 139, in wrapper
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return f(*args, **kwargs)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/api.py", line 124, in wrapped
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource traceback.format_exc())
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.force_reraise()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/api.py", line 119, in wrapped
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return f(*dup_args, **dup_kwargs)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/api/v2/base.py", line 543, in _create
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource obj = do_create(body)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/api/v2/base.py", line 525, in do_create
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource request.context, reservation.reservation_id)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.force_reraise()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/api/v2/base.py", line 518, in do_create
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return obj_creator(request.context, **kwargs)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/vmware-nsx/vmware_nsx/plugins/nsx_v3/plugin.py", line 1769, in create_port
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource neutron_db = super(NsxV3Plugin, self).create_port(context, port)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/api.py", line 159, in wrapped
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return method(*args, **kwargs)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/db_base_plugin_v2.py", line 1138, in create_port
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource db_port = self.create_port_db(context, port)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/db_base_plugin_v2.py", line 1173, in create_port_db
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource context, port, port_id)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/ipam_pluggable_backend.py", line 191, in allocate_ips_for_port_and_store
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource revert_on_fail=False)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.force_reraise()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/ipam_pluggable_backend.py", line 172, in allocate_ips_for_port_and_store
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource ips = self._allocate_ips_for_port(context, port_copy)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/ipam_pluggable_backend.py", line 235, in _allocate_ips_for_port
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return self._ipam_allocate_ips(context, ipam_driver, p, ips)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/ipam_pluggable_backend.py", line 147, in _ipam_allocate_ips
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource "external system for %s"), addresses)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.force_reraise()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource six.reraise(self.type_, self.value, self.tb)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/db/ipam_pluggable_backend.py", line 121, in _ipam_allocate_ips
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource ip_address, subnet_id = ipam_allocator.allocate(ip_request)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/ipam/subnet_alloc.py", line 232, in allocate
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return ipam_subnet.allocate(address_request), subnet_id
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/opt/stack/neutron/neutron/ipam/drivers/neutrondb_ipam/driver.py", line 210, in allocate
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.subnet_manager.create_allocation(session, ip_address)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 490, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.rollback()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource compat.reraise(exc_type, exc_value, exc_tb)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 487, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.commit()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 392, in commit
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self._prepare_impl()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 372, in _prepare_impl
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self.session.flush()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2019, in flush
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self._flush(objects)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2137, in _flush
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource transaction.rollback(_capture_exception=True)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource compat.reraise(exc_type, exc_value, exc_tb)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2101, in _flush
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource flush_context.execute()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 373, in execute
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource rec.execute(self)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 532, in execute
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource uow
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 174, in save_obj
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource mapper, table, insert)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 767, in _emit_insert_statements
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource execute(statement, multiparams)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 914, in execute
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return meth(self, multiparams, params)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/elements.py", line 323, in _execute_on_connection
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource return connection._execute_clauseelement(self, multiparams, params)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1010, in _execute_clauseelement
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource compiled_sql, distilled_params
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1146, in _execute_context
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource context)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1337, in _handle_dbapi_exception
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource util.raise_from_cause(newraise, exc_info)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 202, in raise_from_cause
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource reraise(type(exception), exception, tb=exc_tb, cause=cause)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1139, in _execute_context
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource context)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 450, in do_execute
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource cursor.execute(statement, parameters)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/pymysql/cursors.py", line 167, in execute
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource result = self._query(query)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/pymysql/cursors.py", line 323, in _query
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource conn.query(q)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 836, in query
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource self._affected_rows = self._read_query_result(unbuffered=unbuffered)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 1020, in _read_query_result
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource result.read()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 1303, in read
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource first_packet = self.connection._read_packet()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 982, in _read_packet
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource packet.check_error()
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 394, in check_error
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource err.raise_mysql_exception(self._data)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/pymysql/err.py", line 120, in raise_mysql_exception
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource _check_mysql_exception(errinfo)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource File "/usr/local/lib/python2.7/dist-packages/pymysql/err.py", line 112, in _check_mysql_exception
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource raise errorclass(errno, errorvalue)
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource DBDuplicateEntry: (pymysql.err.IntegrityError) (1062, u"Duplicate entry '70.1.1.4-7005b2ac-9431-41f3-a59a-f6d19589b03c' for key 'PRIMARY'") [SQL: u'INSERT INTO ipamallocations (ip_address, status, ipam_subnet_id) VALUES (%(ip_address)s, %(status)s, %(ipam_subnet_id)s)'] [parameters: {'status': 'ALLOCATED', 'ip_address': '70.1.1.4', 'ipam_subnet_id': u'7005b2ac-9431-41f3-a59a-f6d19589b03c'}]
2016-11-16 18:32:28.715 5697 ERROR neutron.api.v2.resource