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[Bug 2069409] [NEW] Addding route in qrouter namesapce failing as Nexthop has invalid gateway.

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Public bug reported:

Sometimes we see a case that rfp in qrouter namespace and fpr in fip
namespace is down . which results in adding route with those interface
in l3 agent code at dvr_fip_ns.py failing as "Nexthop has invalid
gateway"

The better way would be check the interface status before add the route
entry at
https://github.com/openstack/neutron/blob/master/neutron/agent/l3/dvr_fip_ns.py#L458

Stack trace:
============
2024-03-29 08:00:19.027 5996 ERROR neutron.agent.linux.utils [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.

2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
: neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info Traceback (most recent call last):
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/common/utils.py", line 159, in call
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     return func(*args, **kwargs)
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/router_info.py", line 1207, in process
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.process_external()
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 724, in process_external
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.connect_rtr_2_fip()
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 739, in connect_rtr_2_fip
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.fip_ns.create_rtr_2_fip_link(self)
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_fip_ns.py", line 456, in create_rtr_2_fip_link
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     rtr_2_fip_dev.route.add_gateway(str(fip_2_rtr.ip), table=FIP_RT_TBL)
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 609, in add_gateway
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self._as_root([ip_version], tuple(args))
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 410, in _as_root
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     use_root_namespace=use_root_namespace)
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 124, in _as_root
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     namespace=namespace)
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 132, in _execute
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     log_fail_as_error=self.log_fail_as_error)
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/utils.py", line 160, in execute
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     returncode=returncode)
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info
2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info

** Affects: neutron
     Importance: Undecided
     Assignee: Mohankumar (mohankumar-n)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Mohankumar (mohankumar-n)

** Description changed:

  Sometimes we see a case that rfp in qrouter namespace and fpr in fip
- namespace is down . which results in adding static route with those
- interface failing as "Nexthop has invalid gateway"
+ namespace is down . which results in adding static route command with
+ those interface in l3 agent code at dvr_fip_ns.py failing as "Nexthop
+ has invalid gateway"
  
  The better way would be check the interface status before add the route
  entry at
  https://github.com/openstack/neutron/blob/master/neutron/agent/l3/dvr_fip_ns.py#L458
  
  Stack trace:
  ============
- 2024-03-29 08:00:19.027 5996 ERROR neutron.agent.linux.utils [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.                                                          
-                                                                                                                                                                                                        
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.                                                       
- : neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.                                                                           
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info Traceback (most recent call last):                                                                                                     
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/common/utils.py", line 159, in call                                 
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     return func(*args, **kwargs)                                                                                                       
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/router_info.py", line 1207, in process                     
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.process_external()                                                                                                            
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 724, in process_external        
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.connect_rtr_2_fip()                                                                                                           
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 739, in connect_rtr_2_fip       
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.fip_ns.create_rtr_2_fip_link(self)                                                                                            
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_fip_ns.py", line 456, in create_rtr_2_fip_link         
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     rtr_2_fip_dev.route.add_gateway(str(fip_2_rtr.ip), table=FIP_RT_TBL)                                                               
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 609, in add_gateway                    
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self._as_root([ip_version], tuple(args))                                                                                           
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 410, in _as_root                       
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     use_root_namespace=use_root_namespace)                                                                                             
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 124, in _as_root                       
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     namespace=namespace)                                                                                                               
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 132, in _execute                       
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     log_fail_as_error=self.log_fail_as_error)                                                                                          
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/utils.py", line 160, in execute                         
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     returncode=returncode)                                                                                                             
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.             
- 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info                                                                                                                                        
+ 2024-03-29 08:00:19.027 5996 ERROR neutron.agent.linux.utils [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
+ 
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
+ : neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info Traceback (most recent call last):
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/common/utils.py", line 159, in call
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     return func(*args, **kwargs)
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/router_info.py", line 1207, in process
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.process_external()
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 724, in process_external
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.connect_rtr_2_fip()
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 739, in connect_rtr_2_fip
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.fip_ns.create_rtr_2_fip_link(self)
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_fip_ns.py", line 456, in create_rtr_2_fip_link
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     rtr_2_fip_dev.route.add_gateway(str(fip_2_rtr.ip), table=FIP_RT_TBL)
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 609, in add_gateway
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self._as_root([ip_version], tuple(args))
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 410, in _as_root
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     use_root_namespace=use_root_namespace)
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 124, in _as_root
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     namespace=namespace)
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 132, in _execute
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     log_fail_as_error=self.log_fail_as_error)
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/utils.py", line 160, in execute
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     returncode=returncode)
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info
+ 2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info

** Description changed:

  Sometimes we see a case that rfp in qrouter namespace and fpr in fip
- namespace is down . which results in adding static route command with
- those interface in l3 agent code at dvr_fip_ns.py failing as "Nexthop
- has invalid gateway"
+ namespace is down . which results in adding route with those interface
+ in l3 agent code at dvr_fip_ns.py failing as "Nexthop has invalid
+ gateway"
  
  The better way would be check the interface status before add the route
  entry at
  https://github.com/openstack/neutron/blob/master/neutron/agent/l3/dvr_fip_ns.py#L458
  
  Stack trace:
  ============
  2024-03-29 08:00:19.027 5996 ERROR neutron.agent.linux.utils [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
  
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
  : neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info Traceback (most recent call last):
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/common/utils.py", line 159, in call
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     return func(*args, **kwargs)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/router_info.py", line 1207, in process
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.process_external()
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 724, in process_external
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.connect_rtr_2_fip()
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 739, in connect_rtr_2_fip
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.fip_ns.create_rtr_2_fip_link(self)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_fip_ns.py", line 456, in create_rtr_2_fip_link
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     rtr_2_fip_dev.route.add_gateway(str(fip_2_rtr.ip), table=FIP_RT_TBL)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 609, in add_gateway
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self._as_root([ip_version], tuple(args))
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 410, in _as_root
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     use_root_namespace=use_root_namespace)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 124, in _as_root
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     namespace=namespace)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 132, in _execute
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     log_fail_as_error=self.log_fail_as_error)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/utils.py", line 160, in execute
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     returncode=returncode)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info

-- 
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https://bugs.launchpad.net/bugs/2069409

Title:
  Addding route in qrouter namesapce failing as  Nexthop has invalid
  gateway.

Status in neutron:
  New

Bug description:
  Sometimes we see a case that rfp in qrouter namespace and fpr in fip
  namespace is down . which results in adding route with those interface
  in l3 agent code at dvr_fip_ns.py failing as "Nexthop has invalid
  gateway"

  The better way would be check the interface status before add the
  route entry at
  https://github.com/openstack/neutron/blob/master/neutron/agent/l3/dvr_fip_ns.py#L458

  Stack trace:
  ============
  2024-03-29 08:00:19.027 5996 ERROR neutron.agent.linux.utils [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.

  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
  : neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info Traceback (most recent call last):
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/common/utils.py", line 159, in call
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     return func(*args, **kwargs)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/router_info.py", line 1207, in process
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.process_external()
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 724, in process_external
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.connect_rtr_2_fip()
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_local_router.py", line 739, in connect_rtr_2_fip
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self.fip_ns.create_rtr_2_fip_link(self)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/l3/dvr_fip_ns.py", line 456, in create_rtr_2_fip_link
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     rtr_2_fip_dev.route.add_gateway(str(fip_2_rtr.ip), table=FIP_RT_TBL)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 609, in add_gateway
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     self._as_root([ip_version], tuple(args))
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 410, in _as_root
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     use_root_namespace=use_root_namespace)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 124, in _as_root
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     namespace=namespace)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/ip_lib.py", line 132, in _execute
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     log_fail_as_error=self.log_fail_as_error)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info   File "/opt/openstack/neutron/lib/python3.6/site-packages/neutron/agent/linux/utils.py", line 160, in execute
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info     returncode=returncode)
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info
  2024-03-29 08:00:19.028 5996 ERROR neutron.agent.l3.router_info

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