Public bug reported:
I found out that recently exception like:
Jan 11 08:56:11.074296 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [None
req-207e9202-dfc1-4b0d-b9d4-85eaec6174ee None None] Error while processing VIF
ports: neutron.agent.linux.openvswitch_firewall.exceptions.OVSFWTagNotFound:
Cannot get tag for port tap20acc597-23 from its other_config: {}
Jan 11 08:56:11.074665 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback (most
recent call last):
Jan 11 08:56:11.074999 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 526, in get_or_create_ofport
Jan 11 08:56:11.075349 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent of_port =
self.sg_port_map.ports[port_id]
Jan 11 08:56:11.075713 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent KeyError:
'20acc597-23f0-4c18-980e-061aa6494ccf'
Jan 11 08:56:11.076036 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
Jan 11 08:56:11.077854 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent During handling
of the above exception, another exception occurred:
Jan 11 08:56:11.078269 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
Jan 11 08:56:11.078611 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback (most
recent call last):
Jan 11 08:56:11.079337 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 79, in get_tag_from_other_config
Jan 11 08:56:11.079670 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent return
int(other_config['tag'])
Jan 11 08:56:11.080000 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent KeyError: 'tag'
Jan 11 08:56:11.080351 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
Jan 11 08:56:11.080677 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent During handling
of the above exception, another exception occurred:
Jan 11 08:56:11.081027 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
Jan 11 08:56:11.081354 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback (most
recent call last):
Jan 11 08:56:11.081681 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py",
line 2196, in rpc_loop
Jan 11 08:56:11.082077 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent port_info,
provisioning_needed)
Jan 11 08:56:11.082475 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/usr/local/lib/python3.5/dist-packages/osprofiler/profiler.py", line 160, in
wrapper
Jan 11 08:56:11.082907 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent result =
f(*args, **kwargs)
Jan 11 08:56:11.083233 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py",
line 1770, in process_network_ports
Jan 11 08:56:11.083560 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
port_info.get('updated', set()))
Jan 11 08:56:11.083903 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/securitygroups_rpc.py", line 268, in
setup_port_filters
Jan 11 08:56:11.084232 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
self.refresh_firewall(updated_devices)
Jan 11 08:56:11.084563 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/securitygroups_rpc.py", line 122, in
decorated_function
Jan 11 08:56:11.084901 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent *args,
**kwargs)
Jan 11 08:56:11.085230 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/securitygroups_rpc.py", line 221, in
refresh_firewall
Jan 11 08:56:11.085575 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
self._apply_port_filter(device_ids, update_filter=True)
Jan 11 08:56:11.085961 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/securitygroups_rpc.py", line 153, in
_apply_port_filter
Jan 11 08:56:11.086287 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
self.firewall.update_port_filter(device)
Jan 11 08:56:11.086680 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 581, in update_port_filter
Jan 11 08:56:11.086999 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent of_port =
self.get_or_create_ofport(port)
Jan 11 08:56:11.087321 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 528, in get_or_create_ofport
Jan 11 08:56:11.087936 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
port_vlan_id = self._get_port_vlan_tag(ovs_port.port_name)
Jan 11 08:56:11.088270 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 512, in _get_port_vlan_tag
Jan 11 08:56:11.089768 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent return
get_tag_from_other_config(self.int_br.br, port_name)
Jan 11 08:56:11.090081 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 82, in get_tag_from_other_config
Jan 11 08:56:11.090328 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
port_name=port_name, other_config=other_config)
Jan 11 08:56:11.090619 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
neutron.agent.linux.openvswitch_firewall.exceptions.OVSFWTagNotFound: Cannot
get tag for port tap20acc597-23 from its other_config: {}
Is appearing in q-agt logs in CI jobs quite often.
Example:
http://logs.openstack.org/41/626641/17/check/grenade-py3/50d0a7b/logs/screen-q-agt.txt.gz?level=ERROR
I'm not sure if this is direct reason of test failures but we should
avoid such exceptions in logs IMHO if it is "normal" case.
** Affects: neutron
Importance: Medium
Status: Confirmed
** Tags: ovs-fw
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https://bugs.launchpad.net/bugs/1811405
Title:
OVSFWTagNotFound raised many times in neutron-openvswitch-agent logs
Status in neutron:
Confirmed
Bug description:
I found out that recently exception like:
Jan 11 08:56:11.074296 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [None
req-207e9202-dfc1-4b0d-b9d4-85eaec6174ee None None] Error while processing VIF
ports: neutron.agent.linux.openvswitch_firewall.exceptions.OVSFWTagNotFound:
Cannot get tag for port tap20acc597-23 from its other_config: {}
Jan 11 08:56:11.074665 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback (most
recent call last):
Jan 11 08:56:11.074999 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 526, in get_or_create_ofport
Jan 11 08:56:11.075349 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent of_port =
self.sg_port_map.ports[port_id]
Jan 11 08:56:11.075713 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent KeyError:
'20acc597-23f0-4c18-980e-061aa6494ccf'
Jan 11 08:56:11.076036 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
Jan 11 08:56:11.077854 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent During handling
of the above exception, another exception occurred:
Jan 11 08:56:11.078269 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
Jan 11 08:56:11.078611 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback (most
recent call last):
Jan 11 08:56:11.079337 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 79, in get_tag_from_other_config
Jan 11 08:56:11.079670 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent return
int(other_config['tag'])
Jan 11 08:56:11.080000 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent KeyError: 'tag'
Jan 11 08:56:11.080351 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
Jan 11 08:56:11.080677 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent During handling
of the above exception, another exception occurred:
Jan 11 08:56:11.081027 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
Jan 11 08:56:11.081354 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback (most
recent call last):
Jan 11 08:56:11.081681 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py",
line 2196, in rpc_loop
Jan 11 08:56:11.082077 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent port_info,
provisioning_needed)
Jan 11 08:56:11.082475 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/usr/local/lib/python3.5/dist-packages/osprofiler/profiler.py", line 160, in
wrapper
Jan 11 08:56:11.082907 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent result =
f(*args, **kwargs)
Jan 11 08:56:11.083233 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py",
line 1770, in process_network_ports
Jan 11 08:56:11.083560 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
port_info.get('updated', set()))
Jan 11 08:56:11.083903 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/securitygroups_rpc.py", line 268, in
setup_port_filters
Jan 11 08:56:11.084232 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
self.refresh_firewall(updated_devices)
Jan 11 08:56:11.084563 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/securitygroups_rpc.py", line 122, in
decorated_function
Jan 11 08:56:11.084901 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent *args,
**kwargs)
Jan 11 08:56:11.085230 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/securitygroups_rpc.py", line 221, in
refresh_firewall
Jan 11 08:56:11.085575 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
self._apply_port_filter(device_ids, update_filter=True)
Jan 11 08:56:11.085961 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/securitygroups_rpc.py", line 153, in
_apply_port_filter
Jan 11 08:56:11.086287 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
self.firewall.update_port_filter(device)
Jan 11 08:56:11.086680 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 581, in update_port_filter
Jan 11 08:56:11.086999 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent of_port =
self.get_or_create_ofport(port)
Jan 11 08:56:11.087321 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 528, in get_or_create_ofport
Jan 11 08:56:11.087936 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
port_vlan_id = self._get_port_vlan_tag(ovs_port.port_name)
Jan 11 08:56:11.088270 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 512, in _get_port_vlan_tag
Jan 11 08:56:11.089768 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent return
get_tag_from_other_config(self.int_br.br, port_name)
Jan 11 08:56:11.090081 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File
"/opt/stack/new/neutron/neutron/agent/linux/openvswitch_firewall/firewall.py",
line 82, in get_tag_from_other_config
Jan 11 08:56:11.090328 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
port_name=port_name, other_config=other_config)
Jan 11 08:56:11.090619 ubuntu-xenial-rax-dfw-0001639322
neutron-openvswitch-agent[13907]: ERROR
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
neutron.agent.linux.openvswitch_firewall.exceptions.OVSFWTagNotFound: Cannot
get tag for port tap20acc597-23 from its other_config: {}
Is appearing in q-agt logs in CI jobs quite often.
Example:
http://logs.openstack.org/41/626641/17/check/grenade-py3/50d0a7b/logs/screen-q-agt.txt.gz?level=ERROR
I'm not sure if this is direct reason of test failures but we should
avoid such exceptions in logs IMHO if it is "normal" case.
To manage notifications about this bug go to:
https://bugs.launchpad.net/neutron/+bug/1811405/+subscriptions
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