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[Bug 2111584] [NEW] Failed get list of ports due to removed network

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Sergey Kraynev <2111584@xxxxxxxxxxxxxxxxxx>
Date: Fri, 23 May 2025 13:20:53 -0000
Reply-to: Bug 2111584 <2111584@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Public bug reported:

I use zed version of Neutron with OVS driver, but looks like the same
issue could be reproduced on master for OVN as well.

- I have huge region with 1000+ ports
- Run GET request for list of ports (/v2/ports?limit=0).  (which takes 10+ seconds)
- exactly after running this command I delete one port with its network

Finally I get: 500 on request and traceback on neutron-server api:

""""
IndexError: list index out of range
  File "pecan/core.py", line 693, in __call__
    self.invoke_controller(controller, args, kwargs, state)
  File "pecan/core.py", line 584, in invoke_controller
    result = controller(*args, **kwargs)
  File "neutron_lib/db/api.py", line 142, in wrapped
    setattr(e, '_RETRY_EXCEEDED', True)
  File "oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "neutron_lib/db/api.py", line 138, in wrapped
    return f(*args, **kwargs)
  File "oslo_db/api.py", line 154, in wrapper
    ectxt.value = e.inner_exc
  File "oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "oslo_db/api.py", line 142, in wrapper
    return f(*args, **kwargs)
  File "neutron_lib/db/api.py", line 190, in wrapped
    context_reference.session.rollback()
  File "oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "neutron_lib/db/api.py", line 184, in wrapped
    return f(*dup_args, **dup_kwargs)
  File "neutron/pecan_wsgi/controllers/utils.py", line 65, in wrapped
    return f(*args, **kwargs)
  File "neutron/pecan_wsgi/controllers/resource.py", line 135, in index
    return self.get(*args, **kwargs)
  File "neutron/pecan_wsgi/controllers/resource.py", line 144, in get
    return {self.collection: self.plugin_lister(*lister_args,
  File "neutron_lib/db/api.py", line 226, in wrapped
    return f_with_retry(*args, **kwargs,
  File "neutron_lib/db/api.py", line 142, in wrapped
    setattr(e, '_RETRY_EXCEEDED', True)
  File "oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "neutron_lib/db/api.py", line 138, in wrapped
    return f(*args, **kwargs)
  File "oslo_db/api.py", line 154, in wrapper
    ectxt.value = e.inner_exc
  File "oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "oslo_db/api.py", line 142, in wrapper
    return f(*args, **kwargs)
  File "neutron_lib/db/api.py", line 190, in wrapped
    context_reference.session.rollback()
  File "oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "neutron_lib/db/api.py", line 184, in wrapped
    return f(*dup_args, **dup_kwargs)
  File "oslo_db/sqlalchemy/enginefacade.py", line 1010, in wrapper
    return fn(*args, **kwargs)
  File "neutron/db/db_base_plugin_v2.py", line 1635, in get_ports
    resource_extend.apply_funcs(port_def.COLLECTION_NAME_BULK, items, None)
  File "oslo_utils/timeutils.py", line 319, in wrapper
    result = func(*args, **kwargs)
  File "neutron_lib/db/resource_extend.py", line 91, in apply_funcs
    resolved_func(response, db_object)
  File "neutron/services/qos/qos_plugin.py", line 300, in _extend_port_resource_request_bulk
    min_bw_request_group = QoSPlugin._get_min_bw_request_group(
  File "neutron/services/qos/qos_plugin.py", line 207, in _get_min_bw_request_group
    min_bw_traits = QoSPlugin._get_min_bw_traits(vnic_type, segments)
  File "neutron/services/qos/qos_plugin.py", line 256, in _get_min_bw_traits
    first_segment = segments[0]

""""


I suppose, that it happens because network was removed during request and there are no network segments (for this network) in DB. So segments in result equal to empty list.
As result here: https://github.com/openstack/neutron/blob/5fbb3c1a3ffd895acb4869e54643c63981e38f34/neutron/services/qos/qos_plugin.py#L256 
Getting the first element from empty list is failed.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2111584

Title:
  Failed get list of ports due to removed network

Status in neutron:
  New

Bug description:
  I use zed version of Neutron with OVS driver, but looks like the same
  issue could be reproduced on master for OVN as well.

  - I have huge region with 1000+ ports
  - Run GET request for list of ports (/v2/ports?limit=0).  (which takes 10+ seconds)
  - exactly after running this command I delete one port with its network

  Finally I get: 500 on request and traceback on neutron-server api:

  """"
  IndexError: list index out of range
    File "pecan/core.py", line 693, in __call__
      self.invoke_controller(controller, args, kwargs, state)
    File "pecan/core.py", line 584, in invoke_controller
      result = controller(*args, **kwargs)
    File "neutron_lib/db/api.py", line 142, in wrapped
      setattr(e, '_RETRY_EXCEEDED', True)
    File "oslo_utils/excutils.py", line 227, in __exit__
      self.force_reraise()
    File "oslo_utils/excutils.py", line 200, in force_reraise
      raise self.value
    File "neutron_lib/db/api.py", line 138, in wrapped
      return f(*args, **kwargs)
    File "oslo_db/api.py", line 154, in wrapper
      ectxt.value = e.inner_exc
    File "oslo_utils/excutils.py", line 227, in __exit__
      self.force_reraise()
    File "oslo_utils/excutils.py", line 200, in force_reraise
      raise self.value
    File "oslo_db/api.py", line 142, in wrapper
      return f(*args, **kwargs)
    File "neutron_lib/db/api.py", line 190, in wrapped
      context_reference.session.rollback()
    File "oslo_utils/excutils.py", line 227, in __exit__
      self.force_reraise()
    File "oslo_utils/excutils.py", line 200, in force_reraise
      raise self.value
    File "neutron_lib/db/api.py", line 184, in wrapped
      return f(*dup_args, **dup_kwargs)
    File "neutron/pecan_wsgi/controllers/utils.py", line 65, in wrapped
      return f(*args, **kwargs)
    File "neutron/pecan_wsgi/controllers/resource.py", line 135, in index
      return self.get(*args, **kwargs)
    File "neutron/pecan_wsgi/controllers/resource.py", line 144, in get
      return {self.collection: self.plugin_lister(*lister_args,
    File "neutron_lib/db/api.py", line 226, in wrapped
      return f_with_retry(*args, **kwargs,
    File "neutron_lib/db/api.py", line 142, in wrapped
      setattr(e, '_RETRY_EXCEEDED', True)
    File "oslo_utils/excutils.py", line 227, in __exit__
      self.force_reraise()
    File "oslo_utils/excutils.py", line 200, in force_reraise
      raise self.value
    File "neutron_lib/db/api.py", line 138, in wrapped
      return f(*args, **kwargs)
    File "oslo_db/api.py", line 154, in wrapper
      ectxt.value = e.inner_exc
    File "oslo_utils/excutils.py", line 227, in __exit__
      self.force_reraise()
    File "oslo_utils/excutils.py", line 200, in force_reraise
      raise self.value
    File "oslo_db/api.py", line 142, in wrapper
      return f(*args, **kwargs)
    File "neutron_lib/db/api.py", line 190, in wrapped
      context_reference.session.rollback()
    File "oslo_utils/excutils.py", line 227, in __exit__
      self.force_reraise()
    File "oslo_utils/excutils.py", line 200, in force_reraise
      raise self.value
    File "neutron_lib/db/api.py", line 184, in wrapped
      return f(*dup_args, **dup_kwargs)
    File "oslo_db/sqlalchemy/enginefacade.py", line 1010, in wrapper
      return fn(*args, **kwargs)
    File "neutron/db/db_base_plugin_v2.py", line 1635, in get_ports
      resource_extend.apply_funcs(port_def.COLLECTION_NAME_BULK, items, None)
    File "oslo_utils/timeutils.py", line 319, in wrapper
      result = func(*args, **kwargs)
    File "neutron_lib/db/resource_extend.py", line 91, in apply_funcs
      resolved_func(response, db_object)
    File "neutron/services/qos/qos_plugin.py", line 300, in _extend_port_resource_request_bulk
      min_bw_request_group = QoSPlugin._get_min_bw_request_group(
    File "neutron/services/qos/qos_plugin.py", line 207, in _get_min_bw_request_group
      min_bw_traits = QoSPlugin._get_min_bw_traits(vnic_type, segments)
    File "neutron/services/qos/qos_plugin.py", line 256, in _get_min_bw_traits
      first_segment = segments[0]

  """"

  
  I suppose, that it happens because network was removed during request and there are no network segments (for this network) in DB. So segments in result equal to empty list.
  As result here: https://github.com/openstack/neutron/blob/5fbb3c1a3ffd895acb4869e54643c63981e38f34/neutron/services/qos/qos_plugin.py#L256 
  Getting the first element from empty list is failed.

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