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Hi,

This has almost the same trace as a bug I've been working on, 
https://bugs.launchpad.net/bugs/1988069

You could confirm by looking in the namespace:

$ sudo ip netns exec qdhcp-8db375e0-28d2-4379-9330-397dc9b4f2b1 ip a

If you see any mtu value less than 68 then it is the same issue.

Fix is to increase the mtu on network 
8db375e0-28d2-4379-9330-397dc9b4f2b1 to at least 68, preferably 1450 or 
so depending on your overlay.

If that's not it please file a new bug with all the above info provided.

The other possibilities are a kernel issue, or the pyroute2 library, 
both of which have caused issues configuring IP addresses in namespaces.

-Brian

On 4/4/23 2:48 PM, Franck VEDEL wrote:
> Hello.
> 
> I come back to you to try to understand my problem.
> My installation is based on kolla-ansible, Yoga, Centos-Stream.
> For some time, without understanding why, neutron_dhcp no longer works 
> on external networks and the networks of my students' projects. This 
> generates many error messages, which are difficult to understand.
> 
> Could this be a bug in this version? Before, it worked very well, but I 
> have the impression that when the number of network increases (i’m not 
> sure), from a moment, dhcp does not work anymore.
> What is the way to find the problem?
> 
> Here are examples of errors that won't stop even if no one creates more 
> instances of them
> 
> 2023-04-04 20:36:52.870 7 ERROR neutron.agent.dhcp.agent     device, 
> namespace, scope, broadcast)
> 2023-04-04 20:36:52.870 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_privsep/priv_context.py", line 272, in _wrap
> 2023-04-04 20:36:52.870 7 ERROR neutron.agent.dhcp.agent     r_call_timeout)
> 2023-04-04 20:36:52.870 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_privsep/daemon.py", line 215, in remote_call
> 2023-04-04 20:36:52.870 7 ERROR neutron.agent.dhcp.agent     raise 
> exc_type(*result[2])
> 2023-04-04 20:36:52.870 7 ERROR neutron.agent.dhcp.agent 
> neutron.privileged.agent.linux.ip_lib.InvalidArgument: Invalid 
> parameter/value used on interface tap73cd30e2-35, namespace 
> qdhcp-395f1edb-de6d-4dd8-b31b-69a53780c012.
> 2023-04-04 20:36:52.870 7 ERROR neutron.agent.dhcp.agent
> 2023-04-04 20:36:52.871 7 INFO neutron.agent.dhcp.agent [-] Finished 
> network 395f1edb-de6d-4dd8-b31b-69a53780c012 dhcp configuration
> 2023-04-04 20:36:52.872 7 INFO neutron.agent.dhcp.agent [-] Starting 
> network 8db375e0-28d2-4379-9330-397dc9b4f2b1 dhcp configuration
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent [-] Unable to 
> enable dhcp for 8db375e0-28d2-4379-9330-397dc9b4f2b1.: 
> neutron.privileged.agent.linux.ip_lib.InvalidArgument: Invalid 
> parameter/value used on interface tap1c220d25-b9, namespace 
> qdhcp-8db375e0-28d2-4379-9330-397dc9b4f2b1.
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent Traceback (most 
> recent call last):
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/dhcp/agent.py", line 218, in call_driver
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     rv = 
> getattr(driver, action)(**action_kwargs)
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/dhcp.py", line 274, in enable
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     
> common_utils.wait_until_true(self._enable, timeout=300)
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/common/utils.py", line 717, in wait_until_true
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     while not 
> predicate():
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/dhcp.py", line 286, in _enable
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     
> interface_name = self.device_manager.setup(self.network)
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/dhcp.py", line 1779, in setup
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     
> namespace=network.namespace)
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/interface.py", line 152, in init_l3
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     
> device.addr.add(ip_cidr)
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 537, in add
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     add_broadcast)
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 823, in add_ip_address
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     device, 
> namespace, scope, broadcast)
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_privsep/priv_context.py", line 272, in _wrap
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     r_call_timeout)
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent   File 
> "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_privsep/daemon.py", line 215, in remote_call
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent     raise 
> exc_type(*result[2])
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent 
> neutron.privileged.agent.linux.ip_lib.InvalidArgument: Invalid 
> parameter/value used on interface tap1c220d25-b9, namespace 
> qdhcp-8db375e0-28d2-4379-9330-397dc9b4f2b1.
> 2023-04-04 20:36:53.587 7 ERROR neutron.agent.dhcp.agent
> 
> Thanks a lot
> 
> 
> 
> 
> Franck
>