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[Bug 1621281] [NEW] 500 when deleting a flavor associated to an existing router

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Armando Migliaccio <1621281@xxxxxxxxxxxxxxxxxx>
Date: Thu, 08 Sep 2016 00:20:03 -0000
Reply-to: Bug 1621281 <1621281@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

2016-09-07 17:17:36.330 DEBUG neutron.wsgi [-] (11553) accepted ('192.168.56.101', 44115) from (pid=11553) server /usr/local/lib/python2.7/dist-packages/eventlet/wsgi.py:868
2016-09-07 17:17:36.331 INFO neutron.wsgi [req-9325d159-689c-4eec-a2f2-09a3cd2cdd5d tempest-RoutersFlavorTestCase-2139645665 a20e05e7617e4a0c99fb4b4c28ca018f] 192.168.56.101 - - [07/Sep/2016 17:17:36] "DE
LETE /v2.0/flavors/343b36ce-d64f-4cb4-ae2c-23afae44eabf/service_profiles/1bf3da54-b456-4cd5-93b1-a27e4fb3508e HTTP/1.1" 204 168 0.2158262016-09-07 17:17:36.555 ERROR neutron.api.v2.resource [req-2b12a1f1-8b6a-4bea-9878-efb9f352f4b4 tempest-RoutersFlavorTestCase-2139645665 a20e05e7617e4a0c99fb4b4c28ca018f] delete failed: No details.
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource Traceback (most recent call last):
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/resource.py", line 79, in resource
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     result = method(request=request, **args)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/base.py", line 526, in delete
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return self._delete(request, id, **kwargs)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py", line 151, in wrapper
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     ectxt.value = e.inner_exc
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.force_reraise()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     six.reraise(self.type_, self.value, self.tb)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py", line 139, in wrapper
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return f(*args, **kwargs)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/api.py", line 82, in wrapped
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     traceback.format_exc())
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.force_reraise()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     six.reraise(self.type_, self.value, self.tb)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/api.py", line 77, in wrapped
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return f(*args, **kwargs)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/base.py", line 548, in _delete
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     obj_deleter(request.context, id, **kwargs)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/flavors_db.py", line 153, in delete_flavor
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     context.session.delete(fl_db)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 490, in __exit__
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.rollback()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     compat.reraise(exc_type, exc_value, exc_tb)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 487, in __exit__
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.commit()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 392, in commit
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self._prepare_impl()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 372, in _prepare_impl
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.session.flush()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2019, in flush
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self._flush(objects)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2137, in _flush
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     transaction.rollback(_capture_exception=True)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     compat.reraise(exc_type, exc_value, exc_tb)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2101, in _flush
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     flush_context.execute()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 373, in execute
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     rec.execute(self)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 561, in execute
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     uow
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 249, in delete_obj
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     cached_connections, mapper, table, delete)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 892, in _emit_delete_statements
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     c = connection.execute(statement, del_objects)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 914, in execute
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return meth(self, multiparams, params)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/elements.py", line 323, in _execute_on_connection
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return connection._execute_clauseelement(self, multiparams, params)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1010, in _execute_clauseelement
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     compiled_sql, distilled_params
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1146, in _execute_context
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     context)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1337, in _handle_dbapi_exception
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     util.raise_from_cause(newraise, exc_info)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 202, in raise_from_cause
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     reraise(type(exception), exception, tb=exc_tb, cause=cause)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1139, in _execute_context
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     context)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 450, in do_execute
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     cursor.execute(statement, parameters)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/cursors.py", line 167, in execute
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     result = self._query(query)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/cursors.py", line 323, in _query
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     conn.query(q)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 836, in query
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self._affected_rows = self._read_query_result(unbuffered=unbuffered)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 1020, in _read_query_result
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     result.read()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 1303, in read
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     first_packet = self.connection._read_packet()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 982, in _read_packet
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     packet.check_error()
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 394, in check_error
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     err.raise_mysql_exception(self._data)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/err.py", line 120, in raise_mysql_exception
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     _check_mysql_exception(errinfo)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/err.py", line 112, in _check_mysql_exception
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     raise errorclass(errno, errorvalue)
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource DBReferenceError: (pymysql.err.IntegrityError) (1451, u'Cannot delete or update a parent row: a foreign key constraint fails (`neutron`.`routers`, CON
STRAINT `routers_ibfk_3` FOREIGN KEY (`flavor_id`) REFERENCES `flavors` (`id`))') [SQL: u'DELETE FROM flavors WHERE flavors.id = %(id)s'] [parameters: {'id': u'343b36ce-d64f-4cb4-ae2c-23afae44eabf'}]
2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource

** Affects: neutron
     Importance: High
     Assignee: Kevin Benton (kevinbenton)
         Status: Confirmed

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

** Changed in: neutron
     Assignee: (unassigned) => Kevin Benton (kevinbenton)

** Changed in: neutron
    Milestone: None => newton-rc1

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

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https://bugs.launchpad.net/bugs/1621281

Title:
  500 when deleting a flavor associated to an existing router

Status in neutron:
  Confirmed

Bug description:
  2016-09-07 17:17:36.330 DEBUG neutron.wsgi [-] (11553) accepted ('192.168.56.101', 44115) from (pid=11553) server /usr/local/lib/python2.7/dist-packages/eventlet/wsgi.py:868
  2016-09-07 17:17:36.331 INFO neutron.wsgi [req-9325d159-689c-4eec-a2f2-09a3cd2cdd5d tempest-RoutersFlavorTestCase-2139645665 a20e05e7617e4a0c99fb4b4c28ca018f] 192.168.56.101 - - [07/Sep/2016 17:17:36] "DE
  LETE /v2.0/flavors/343b36ce-d64f-4cb4-ae2c-23afae44eabf/service_profiles/1bf3da54-b456-4cd5-93b1-a27e4fb3508e HTTP/1.1" 204 168 0.2158262016-09-07 17:17:36.555 ERROR neutron.api.v2.resource [req-2b12a1f1-8b6a-4bea-9878-efb9f352f4b4 tempest-RoutersFlavorTestCase-2139645665 a20e05e7617e4a0c99fb4b4c28ca018f] delete failed: No details.
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/resource.py", line 79, in resource
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/base.py", line 526, in delete
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return self._delete(request, id, **kwargs)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py", line 151, in wrapper
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     ectxt.value = e.inner_exc
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.force_reraise()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     six.reraise(self.type_, self.value, self.tb)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py", line 139, in wrapper
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return f(*args, **kwargs)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/api.py", line 82, in wrapped
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     traceback.format_exc())
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.force_reraise()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     six.reraise(self.type_, self.value, self.tb)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/api.py", line 77, in wrapped
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return f(*args, **kwargs)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/base.py", line 548, in _delete
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     obj_deleter(request.context, id, **kwargs)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/flavors_db.py", line 153, in delete_flavor
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     context.session.delete(fl_db)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 490, in __exit__
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.rollback()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     compat.reraise(exc_type, exc_value, exc_tb)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 487, in __exit__
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.commit()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 392, in commit
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self._prepare_impl()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 372, in _prepare_impl
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self.session.flush()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2019, in flush
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self._flush(objects)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2137, in _flush
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     transaction.rollback(_capture_exception=True)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     compat.reraise(exc_type, exc_value, exc_tb)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 2101, in _flush
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     flush_context.execute()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 373, in execute
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     rec.execute(self)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 561, in execute
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     uow
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 249, in delete_obj
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     cached_connections, mapper, table, delete)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 892, in _emit_delete_statements
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     c = connection.execute(statement, del_objects)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 914, in execute
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return meth(self, multiparams, params)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/elements.py", line 323, in _execute_on_connection
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     return connection._execute_clauseelement(self, multiparams, params)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1010, in _execute_clauseelement
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     compiled_sql, distilled_params
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1146, in _execute_context
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     context)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1337, in _handle_dbapi_exception
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     util.raise_from_cause(newraise, exc_info)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 202, in raise_from_cause
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     reraise(type(exception), exception, tb=exc_tb, cause=cause)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1139, in _execute_context
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     context)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 450, in do_execute
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     cursor.execute(statement, parameters)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/cursors.py", line 167, in execute
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     result = self._query(query)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/cursors.py", line 323, in _query
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     conn.query(q)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 836, in query
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 1020, in _read_query_result
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     result.read()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 1303, in read
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     first_packet = self.connection._read_packet()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 982, in _read_packet
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     packet.check_error()
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/connections.py", line 394, in check_error
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     err.raise_mysql_exception(self._data)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/err.py", line 120, in raise_mysql_exception
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     _check_mysql_exception(errinfo)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/pymysql/err.py", line 112, in _check_mysql_exception
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource     raise errorclass(errno, errorvalue)
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource DBReferenceError: (pymysql.err.IntegrityError) (1451, u'Cannot delete or update a parent row: a foreign key constraint fails (`neutron`.`routers`, CON
  STRAINT `routers_ibfk_3` FOREIGN KEY (`flavor_id`) REFERENCES `flavors` (`id`))') [SQL: u'DELETE FROM flavors WHERE flavors.id = %(id)s'] [parameters: {'id': u'343b36ce-d64f-4cb4-ae2c-23afae44eabf'}]
  2016-09-07 17:17:36.555 TRACE neutron.api.v2.resource

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Follow ups

[Bug 1621281] Re: 500 when deleting a flavor associated to an existing router
From: OpenStack Infra, 2016-09-09