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[Bug 1706750] [NEW] FlushError for automatic IPAllocations when subnet create is retried

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Ihar Hrachyshka <1706750@xxxxxxxxxxxxxxxxxx>
Date: Wed, 26 Jul 2017 19:19:09 -0000
Reply-to: Bug 1706750 <1706750@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

The error is seen in Red Hat CI: https://bugzilla.redhat.com/show_bug.cgi?id=1470784
There are hits in Kibana too: http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22FlushError%3A%20New%20instance%20%3CIPAllocation%20at%5C%22

In server.log:

2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation [req-3c97d83e-3beb-4b28-a29f-697fc1ee8bc6 5f2e0d72ef8e4fb18b500759cfe5e503 205f2a3630a0426f8da20b4467ea003b - default default] POST failed.: FlushError: New instance <IPAllocation at 0x8b3f7d0> with identity key (<class 'neutron.db.models_v2.IPAllocation'>, ('2003::1:f816:3eff:fe3f:aa00', '8032a1cd-9236-4126-83fa-2f039ed2b890', 'c0542b84-bcd0-48e1-ace1-6da1f50246dc')) conflicts with persistent instance <IPAllocation at 0x89ac310>
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation Traceback (most recent call last):
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/pecan/core.py", line 678, in __call__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.invoke_controller(controller, args, kwargs, state)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/pecan/core.py", line 569, in invoke_controller
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     result = controller(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 94, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     setattr(e, '_RETRY_EXCEEDED', True)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 90, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 150, in wrapper
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     ectxt.value = e.inner_exc
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 138, in wrapper
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 129, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     LOG.debug("Retry wrapper got retriable exception: %s", e)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 125, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*dup_args, **dup_kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/pecan_wsgi/controllers/utils.py", line 70, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/pecan_wsgi/controllers/resource.py", line 152, in post
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return self.create(resources)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/pecan_wsgi/controllers/resource.py", line 170, in create
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return {key: creator(*creator_args, **creator_kwargs)}
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/common/utils.py", line 665, in inner
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(self, context, *args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 164, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return method(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 94, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     setattr(e, '_RETRY_EXCEEDED', True)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 90, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 150, in wrapper
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     ectxt.value = e.inner_exc
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 138, in wrapper
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 129, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     LOG.debug("Retry wrapper got retriable exception: %s", e)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 125, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*dup_args, **dup_kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 985, in create_subnet
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     result, mech_context = self._create_subnet_db(context, subnet)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 977, in _create_subnet_db
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self._create_subnet_postcommit(context, result, net_db, ipam_sub)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 164, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return method(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 94, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     setattr(e, '_RETRY_EXCEEDED', True)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 90, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 150, in wrapper
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     ectxt.value = e.inner_exc
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 138, in wrapper
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 129, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     LOG.debug("Retry wrapper got retriable exception: %s", e)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 125, in wrapped
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*dup_args, **dup_kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 675, in _create_subnet_postcommit
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     result, ipam_subnet)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/ipam_pluggable_backend.py", line 491, in add_auto_addrs_on_network_ports
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     allocated.create()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/objects/base.py", line 225, in decorator
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     res = func(self, *args, **kwargs)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/objects/base.py", line 632, in create
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.modify_fields_to_db(fields))
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/objects/db/api.py", line 61, in create_object
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     context.session.add(db_obj)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 567, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.rollback()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     compat.reraise(exc_type, exc_value, exc_tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 564, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.commit()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 461, in commit
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self._prepare_impl()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 441, in _prepare_impl
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.session.flush()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 2171, in flush
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self._flush(objects)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 2291, in _flush
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     transaction.rollback(_capture_exception=True)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     compat.reraise(exc_type, exc_value, exc_tb)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 2255, in _flush
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     flush_context.execute()
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 389, in execute
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     rec.execute(self)
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 548, in execute
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     uow
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 156, in save_obj
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     base_mapper, states, uowtransaction
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 312, in _organize_states_for_save
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     state_str(existing)))
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation FlushError: New instance <IPAllocation at 0x8b3f7d0> with identity key (<class 'neutron.db.models_v2.IPAllocation'>, ('2003::1:f816:3eff:fe3f:aa00', '8032a1cd-9236-4126-83fa-2f039ed2b890', 'c0542b84-bcd0-48e1-ace1-6da1f50246dc')) conflicts with persistent instance <IPAllocation at 0x89ac310>
2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation

Just before the traceback, we see retry triggered by StaleDataError:

2017-07-13 15:20:50.668 85185 DEBUG neutron.db.api [req-3c97d83e-3beb-4b28-a29f-697fc1ee8bc6 5f2e0d72ef8e4fb18b500759cfe5e503 205f2a3630a0426f8da20b4467ea003b - default default] Retry wrapper got retriable exception: UPDATE statement on table 'standardattributes' expected to update 1 row(s); 0 were matched. wrapped /usr/lib/python2.7/site-packages/neutron/db/api.py:129
2017-07-13 15:20:50.669 85185 DEBUG oslo_db.api [req-3c97d83e-3beb-4b28-a29f-697fc1ee8bc6 5f2e0d72ef8e4fb18b500759cfe5e503 205f2a3630a0426f8da20b4467ea003b - default default] Performing DB retry for function neutron.db.db_base_plugin_v2._create_subnet_postcommit wrapper /usr/lib/python2.7/site-packages/oslo_db/api.py:152

This is probably related to https://review.openstack.org/#/c/396718/

** Affects: neutron
     Importance: High
     Assignee: Ihar Hrachyshka (ihar-hrachyshka)
         Status: In Progress


** Tags: db l3-ipam-dhcp

** Changed in: neutron
   Importance: Undecided => High

** Changed in: neutron
     Assignee: (unassigned) => Ihar Hrachyshka (ihar-hrachyshka)

** Changed in: neutron
       Status: New => Confirmed

** Tags added: db l3-ipam-dhcp

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https://bugs.launchpad.net/bugs/1706750

Title:
  FlushError for automatic IPAllocations when subnet create is retried

Status in neutron:
  In Progress

Bug description:
  The error is seen in Red Hat CI: https://bugzilla.redhat.com/show_bug.cgi?id=1470784
  There are hits in Kibana too: http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22FlushError%3A%20New%20instance%20%3CIPAllocation%20at%5C%22

  In server.log:

  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation [req-3c97d83e-3beb-4b28-a29f-697fc1ee8bc6 5f2e0d72ef8e4fb18b500759cfe5e503 205f2a3630a0426f8da20b4467ea003b - default default] POST failed.: FlushError: New instance <IPAllocation at 0x8b3f7d0> with identity key (<class 'neutron.db.models_v2.IPAllocation'>, ('2003::1:f816:3eff:fe3f:aa00', '8032a1cd-9236-4126-83fa-2f039ed2b890', 'c0542b84-bcd0-48e1-ace1-6da1f50246dc')) conflicts with persistent instance <IPAllocation at 0x89ac310>
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation Traceback (most recent call last):
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/pecan/core.py", line 678, in __call__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.invoke_controller(controller, args, kwargs, state)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/pecan/core.py", line 569, in invoke_controller
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     result = controller(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 94, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     setattr(e, '_RETRY_EXCEEDED', True)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 90, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 150, in wrapper
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     ectxt.value = e.inner_exc
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 138, in wrapper
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 129, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     LOG.debug("Retry wrapper got retriable exception: %s", e)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 125, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*dup_args, **dup_kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/pecan_wsgi/controllers/utils.py", line 70, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/pecan_wsgi/controllers/resource.py", line 152, in post
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return self.create(resources)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/pecan_wsgi/controllers/resource.py", line 170, in create
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return {key: creator(*creator_args, **creator_kwargs)}
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/common/utils.py", line 665, in inner
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(self, context, *args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 164, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return method(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 94, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     setattr(e, '_RETRY_EXCEEDED', True)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 90, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 150, in wrapper
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     ectxt.value = e.inner_exc
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 138, in wrapper
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 129, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     LOG.debug("Retry wrapper got retriable exception: %s", e)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 125, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*dup_args, **dup_kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 985, in create_subnet
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     result, mech_context = self._create_subnet_db(context, subnet)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 977, in _create_subnet_db
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self._create_subnet_postcommit(context, result, net_db, ipam_sub)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 164, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return method(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 94, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     setattr(e, '_RETRY_EXCEEDED', True)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 90, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 150, in wrapper
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     ectxt.value = e.inner_exc
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 138, in wrapper
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 129, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     LOG.debug("Retry wrapper got retriable exception: %s", e)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.force_reraise()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     six.reraise(self.type_, self.value, self.tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/api.py", line 125, in wrapped
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     return f(*dup_args, **dup_kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py", line 675, in _create_subnet_postcommit
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     result, ipam_subnet)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/db/ipam_pluggable_backend.py", line 491, in add_auto_addrs_on_network_ports
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     allocated.create()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/objects/base.py", line 225, in decorator
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     res = func(self, *args, **kwargs)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/objects/base.py", line 632, in create
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.modify_fields_to_db(fields))
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib/python2.7/site-packages/neutron/objects/db/api.py", line 61, in create_object
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     context.session.add(db_obj)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 567, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.rollback()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     compat.reraise(exc_type, exc_value, exc_tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 564, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.commit()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 461, in commit
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self._prepare_impl()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 441, in _prepare_impl
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self.session.flush()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 2171, in flush
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     self._flush(objects)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 2291, in _flush
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     transaction.rollback(_capture_exception=True)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     compat.reraise(exc_type, exc_value, exc_tb)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/session.py", line 2255, in _flush
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     flush_context.execute()
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 389, in execute
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     rec.execute(self)
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/unitofwork.py", line 548, in execute
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     uow
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 156, in save_obj
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     base_mapper, states, uowtransaction
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/persistence.py", line 312, in _organize_states_for_save
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation     state_str(existing)))
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation FlushError: New instance <IPAllocation at 0x8b3f7d0> with identity key (<class 'neutron.db.models_v2.IPAllocation'>, ('2003::1:f816:3eff:fe3f:aa00', '8032a1cd-9236-4126-83fa-2f039ed2b890', 'c0542b84-bcd0-48e1-ace1-6da1f50246dc')) conflicts with persistent instance <IPAllocation at 0x89ac310>
  2017-07-13 15:20:51.064 85185 ERROR neutron.pecan_wsgi.hooks.translation

  Just before the traceback, we see retry triggered by StaleDataError:

  2017-07-13 15:20:50.668 85185 DEBUG neutron.db.api [req-3c97d83e-3beb-4b28-a29f-697fc1ee8bc6 5f2e0d72ef8e4fb18b500759cfe5e503 205f2a3630a0426f8da20b4467ea003b - default default] Retry wrapper got retriable exception: UPDATE statement on table 'standardattributes' expected to update 1 row(s); 0 were matched. wrapped /usr/lib/python2.7/site-packages/neutron/db/api.py:129
  2017-07-13 15:20:50.669 85185 DEBUG oslo_db.api [req-3c97d83e-3beb-4b28-a29f-697fc1ee8bc6 5f2e0d72ef8e4fb18b500759cfe5e503 205f2a3630a0426f8da20b4467ea003b - default default] Performing DB retry for function neutron.db.db_base_plugin_v2._create_subnet_postcommit wrapper /usr/lib/python2.7/site-packages/oslo_db/api.py:152

  This is probably related to https://review.openstack.org/#/c/396718/

To manage notifications about this bug go to:
https://bugs.launchpad.net/neutron/+bug/1706750/+subscriptions
Follow ups

[Bug 1706750] Re: FlushError for automatic IPAllocations when subnet create is retried
From: OpenStack Infra, 2017-12-21
[Bug 1706750] Re: FlushError for automatic IPAllocations when subnet create is retried
From: Ihar Hrachyshka, 2017-11-10
[Bug 1706750] Re: FlushError for automatic IPAllocations when subnet create is retried
From: OpenStack Infra, 2017-07-31