There is also another failure:
No handlers could be found for logger "neutron.common.legacy"
INFO  [alembic.migration] Context impl MySQLImpl.
INFO  [alembic.migration] Will assume non-transactional DDL.
No handlers could be found for logger "neutron.common.legacy"
INFO  [alembic.migration] Context impl MySQLImpl.
INFO  [alembic.migration] Will assume non-transactional DDL.
INFO  [alembic.migration] Running upgrade grizzly -> f489cf14a79c
Traceback (most recent call last):
  File "/usr/bin/neutron-db-manage", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.6/site-packages/neutron/db/migration/cli.py", line 143, in main
    CONF.command.func(config, CONF.command.name)
  File "/usr/lib/python2.6/site-packages/neutron/db/migration/cli.py", line 80, in do_upgrade_downgrade
    do_alembic_command(config, cmd, revision, sql=CONF.command.sql)
  File "/usr/lib/python2.6/site-packages/neutron/db/migration/cli.py", line 59, in do_alembic_command
    getattr(alembic_command, cmd)(config, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/alembic/command.py", line 124, in upgrade
    script.run_env()
  File "/usr/lib/python2.6/site-packages/alembic/script.py", line 191, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/usr/lib/python2.6/site-packages/alembic/util.py", line 186, in load_python_file
    module = imp.load_source(module_id, path, open(path, 'rb'))
  File "/usr/lib/python2.6/site-packages/neutron/db/migration/alembic_migrations/env.py", line 105, in <module>
    run_migrations_online()
  File "/usr/lib/python2.6/site-packages/neutron/db/migration/alembic_migrations/env.py", line 89, in run_migrations_online
    options=build_options())
  File "<string>", line 7, in run_migrations
  File "/usr/lib/python2.6/site-packages/alembic/environment.py", line 494, in run_migrations
    self.get_context().run_migrations(**kw)
  File "/usr/lib/python2.6/site-packages/alembic/migration.py", line 211, in run_migrations
    change(**kw)
  File "/usr/lib/python2.6/site-packages/neutron/db/migration/alembic_migrations/versions/f489cf14a79c_lbaas_havana.py", line 61, in upgrade
    sa.PrimaryKeyConstraint(u'id')
  File "<string>", line 7, in create_table
  File "/usr/lib/python2.6/site-packages/alembic/operations.py", line 570, in create_table
    self._table(name, *columns, **kw)
  File "/usr/lib/python2.6/site-packages/alembic/ddl/impl.py", line 148, in create_table
    self._exec(schema.CreateTable(table))
  File "/usr/lib/python2.6/site-packages/alembic/ddl/impl.py", line 75, in _exec
    conn.execute(construct, *multiparams, **params)
  File "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1449, in execute
    params)
  File "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1542, in _execute_ddl
    compiled
  File "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1698, in _execute_context
    context)
  File "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1691, in _execute_context
    context)
  File "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/default.py", line 331, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/lib64/python2.6/site-packages/MySQLdb/cursors.py", line 173, in execute
    self.errorhandler(self, exc, value)
  File "/usr/lib64/python2.6/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue
sqlalchemy.exc.OperationalError: (OperationalError) (1050, "Table 'vips' already exists") "\nCREATE TABLE vips (\n\ttenant_id VARCHAR(255), \n\tid VARCHAR(36) NOT NULL, \n\tname VARCHAR(255), \n\tdescription VARCHAR(255), \n\tport_id VARCHAR(36), \n\tprotocol_port INTEGER NOT NULL, \n\tprotocol ENUM('HTTP','HTTPS','TCP') NOT NULL, \n\tpool_id VARCHAR(36) NOT NULL, \n\tstatus VARCHAR(16) NOT NULL, \n\tadmin_state_up BOOL NOT NULL, \n\tconnection_limit INTEGER, \n\tPRIMARY KEY (id), \n\tFOREIGN KEY(port_id) REFERENCES ports (id), \n\tUNIQUE (pool_id), \n\tCHECK (admin_state_up IN (0, 1))\n)\n\n" ()

Happens when grizzly is running with LoadBalancer. vips table already exists but creating of this table is in migration chain grizzly->havana (specifically grizzly->f489cf14a79c).