** Description changed:

  # octavia-db-manage upgrade head
  2018-10-09 07:34:52.971 11688 CRITICAL octavia-db-manage [-] Unhandled error: 
AttributeError: 'NoneType' object has no attribute '_instantiate_plugins'
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage Traceback (most recent 
call last):
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/bin/octavia-db-manage", line 10, in <module>
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     sys.exit(main())
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/octavia/db/migration/cli.py", line 138, in main
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     
CONF.command.func(config, CONF.command.name)
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/octavia/db/migration/cli.py", line 68, in 
do_upgrade
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     
do_alembic_command(config, cmd, revision, sql=CONF.command.sql)
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/octavia/db/migration/cli.py", line 36, in 
do_alembic_command
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     
getattr(alembic_cmd, cmd)(config, *args, **kwargs)
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/alembic/command.py", line 254, in upgrade
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     script.run_env()
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/alembic/script/base.py", line 427, in run_env
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     
util.load_python_file(self.dir, 'env.py')
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/alembic/util/pyfiles.py", line 81, in 
load_python_file
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     module = 
load_module_py(module_id, path)
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/alembic/util/compat.py", line 82, in 
load_module_py
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     
spec.loader.exec_module(module)
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File "<frozen 
importlib._bootstrap_external>", line 678, in exec_module
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File "<frozen 
importlib._bootstrap>", line 219, in _call_with_frames_removed
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/octavia/db/migration/alembic_migrations/env.py",
 line 88, in <module>
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     
run_migrations_online()
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/octavia/db/migration/alembic_migrations/env.py",
 line 72, in run_migrations_online
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     
poolclass=pool.NullPool)
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/sqlalchemy/engine/__init__.py", line 424, in 
create_engine
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     return 
strategy.create(*args, **kwargs)
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage   File 
"/usr/lib/python3/dist-packages/sqlalchemy/engine/strategies.py", line 52, in 
create
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage     plugins = 
u._instantiate_plugins(kwargs)
  2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage AttributeError: 
'NoneType' object has no attribute '_instantiate_plugins'
- 2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage 
- 
- My reference test is devstack which runs this under python2.7, could
- this be a Py3 regression?
+ 2018-10-09 07:34:52.971 11688 ERROR octavia-db-manage

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https://bugs.launchpad.net/bugs/1796811

Title:
  octavia-db-manage upgrade head fails with Traceback

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