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[OpenStack Infra <1471957@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/577463
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=c57fede20f0549e3e46cd4dff7d57b5ab39b0805
Submitter: Zuul
Branch:    master

commit c57fede20f0549e3e46cd4dff7d57b5ab39b0805
Author: Andrew Karpow <andrew.karpow@xxxxxxx>
Date:   Fri Jun 22 18:00:52 2018 +0200

    Disallow networks with first ip 0.0.0.0 with dhcp enabled
    
    fixes dhcp-agent errors due to establishing 0.0.0.1 as default gw
    
    Change-Id: I9e64b4597896ffde6a2f4caff81c64ca7738e402
    Closes-Bug: #1471957
    Signed-off-by: Andrew Karpow <andrew.karpow@xxxxxxx>


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1471957

Title:
  Invalid subnet cidr cause dhcp runtimerror

Status in neutron:
  Fix Released

Bug description:
  Trace:
  ERROR neutron.agent.linux.utils [req-26ce0148-4bc4-40bd-96ac-e9d484f37b61 demo 12b3399d1cb64da488e20f6a7c355d10] 
  Command: ['sudo', '/usr/local/bin/neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ip', 'netns', 'exec', 'qdhcp-6cdefebf-ab88-4f55-b2b9-719286a7b75b', 'ip', 'route', 'replace', 'default', 'via', '0.0.0.1', 'dev', 'tapb81e677c-8c']
  Exit code: 2
  Stdout: ''
  Stderr: 'RTNETLINK answers: Network is unreachable\n'
  ERROR neutron.agent.dhcp_agent [req-26ce0148-4bc4-40bd-96ac-e9d484f37b61 demo 12b3399d1cb64da488e20f6a7c355d10] Unable to enable dhcp for 6cdefebf-ab88-4f55-b2b9-719286a7b75b.
  Traceback (most recent call last):
    File "/opt/stack/neutron/neutron/agent/dhcp_agent.py", line 128, in call_driver
      getattr(driver, action)(**action_kwargs)
    File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 205, in enable
      interface_name = self.device_manager.setup(self.network)
    File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 1056, in setup
      self._set_default_route(network, interface_name)
    File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 928, in _set_default_route
      device.route.add_gateway(subnet.gateway_ip)
    File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 395, in add_gateway
      self._as_root(*args)
    File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 242, in _as_root
      kwargs.get('use_root_namespace', False))
    File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 74, in _as_root
      log_fail_as_error=self.log_fail_as_error)
    File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 86, in _execute
      log_fail_as_error=log_fail_as_error)
    File "/opt/stack/neutron/neutron/agent/linux/utils.py", line 84, in execute
      raise RuntimeError(m)
  TRACE neutron.agent.dhcp_agent RuntimeError: 
  TRACE neutron.agent.dhcp_agent Command: ['sudo', '/usr/local/bin/neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ip', 'netns', 'exec', 'qdhcp-6cdefebf-ab88-4f55-b2b9-719286a7b75b', 'ip', 'route', 'replace', 'default', 'vi
  a', '0.0.0.1', 'dev', 'tapb81e677c-8c']
  TRACE neutron.agent.dhcp_agent Exit code: 2
  TRACE neutron.agent.dhcp_agent Stdout: ''
  TRACE neutron.agent.dhcp_agent Stderr: 'RTNETLINK answers: Network is unreachable\n'
  TRACE neutron.agent.dhcp_agent 

  
  Steps to reproduce:
  NET_NAME=test-ip
  neutron net-create ${NET_NAME}
  neutron port-create ${NET_NAME}
  neutron subnet-create ${NET_NAME} 0.0.0.0/8

  
  Impact:
  cause logs to grow more than necessary

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