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[Doug Hellmann <doug@xxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1501873

Title:
  FIP Namespace add/delete race condition seen in DVR router log

Status in neutron:
  Fix Released

Bug description:
  FIP Namespace add/delete race conditon seen in DVR router log. This might cause the FIP functionality to fail.
  From the trace log it seems when this happens, a bunch of tests related to FIP functionality fails with SSH Timeout waiting for reply.

  
  Here is the output of the trace that kinds of shows the race condition.

  Exit code: 0
   execute /opt/stack/new/neutron/neutron/agent/linux/utils.py:156
  2015-09-29 21:10:33.433 7884 DEBUG neutron.agent.l3.dvr_local_router [-] Removed last floatingip, so requesting the server to delete Floatingip Agent Gateway port:{u'allowed_address_pairs': [], u'extra_dhcp_opts': [], u'device_owner': u'network:floatingip_agent_gateway', u'port_security_enabled': False, u'binding:profile': {}, u'fixed_ips': [{u'subnet_id': u'362e9033-db93-4193-9413-1073215ab326', u'prefixlen': 24, u'ip_address': u'172.24.5.9'}, {u'subnet_id': u'feb3aa76-53b1-4d4e-b136-412c747ffd30', u'prefixlen': 64, u'ip_address': u'2001:db8::a'}], u'id': u'044a8e2f-00eb-4231-b526-13cb46dcc42f', u'security_groups': [], u'binding:vif_details': {u'port_filter': True, u'ovs_hybrid_plug': True}, u'binding:vif_type': u'ovs', u'mac_address': u'fa:16:3e:7a:a6:85', u'status': u'DOWN', u'subnets': [{u'ipv6_ra_mode': None, u'cidr': u'2001:db8::/64', u'gateway_ip': u'2001:db8::2', u'id': u'feb3aa76-53b1-4d4e-b136-412c747ffd30', u'subnetpool_id': None}, {u'ipv6_ra_mode': None, u'cidr': u'172.24.5.0/24', u'gateway_ip': u'172.24.5.1', u'id': u'362e9033-db93-4193-9413-1073215ab326', u'subnetpool_id': None}], u'binding:host_id': u'devstack-trusty-hpcloud-b5-5153724', u'dns_assignment': [{u'hostname': u'host-172-24-5-9', u'ip_address': u'172.24.5.9', u'fqdn': u'host-172-24-5-9.openstacklocal.'}, {u'hostname': u'host-2001-db8--a', u'ip_address': u'2001:db8::a', u'fqdn': u'host-2001-db8--a.openstacklocal.'}], u'device_id': u'646bb18b-da52-4ead-a635-012c72c1ccf1', u'name': u'', u'admin_state_up': True, u'network_id': u'31689320-95d7-44f9-932a-cc82c1bca2b4', u'dns_name': u'', u'binding:vnic_type': u'normal', u'tenant_id': u'', u'extra_subnets': []} floating_ip_removed_dist /opt/stack/new/neutron/neutron/agent/l3/dvr_local_router.py:148

  2015-09-29 21:10:34.031 7884 DEBUG neutron.agent.linux.utils [-]
  Running command (rootwrap daemon): ['ip', 'netns', 'delete',
  'fip-31689320-95d7-44f9-932a-cc82c1bca2b4'] execute_rootwrap_daemon
  /opt/stack/new/neutron/neutron/agent/linux/utils.py:101

  
  2015-09-29 21:10:34.043 DEBUG neutron.agent.l3.dvr_local_router [req-33413b07-784c-469e-8a35-0e20312a157e None None] FloatingIP agent gateway port received from the plugin: {u'allowed_address_pairs': [], u'extra_dhcp_opts': [], u'device_owner': u'network:floatingip_agent_gateway', u'port_security_enabled': False, u'binding:profile': {}, u'fixed_ips': [{u'subnet_id': u'362e9033-db93-4193-9413-1073215ab326', u'prefixlen': 24, u'ip_address': u'172.24.5.9'}, {u'subnet_id': u'feb3aa76-53b1-4d4e-b136-412c747ffd30', u'prefixlen': 64, u'ip_address': u'2001:db8::a'}], u'id': u'044a8e2f-00eb-4231-b526-13cb46dcc42f', u'security_groups': [], u'binding:vif_details': {u'port_filter': True, u'ovs_hybrid_plug': True}, u'binding:vif_type': u'ovs', u'mac_address': u'fa:16:3e:7a:a6:85', u'status': u'ACTIVE', u'subnets': [{u'ipv6_ra_mode': None, u'cidr': u'172.24.5.0/24', u'gateway_ip': u'172.24.5.1', u'id': u'362e9033-db93-4193-9413-1073215ab326', u'subnetpool_id': None}, {u'ipv6_ra_mode': None, u'cidr': u'2001:db8::/64', u'gateway_ip': u'2001:db8::2', u'id': u'feb3aa76-53b1-4d4e-b136-412c747ffd30', u'subnetpool_id': None}], u'binding:host_id': u'devstack-trusty-hpcloud-b5-5153724', u'dns_assignment': [{u'hostname': u'host-172-24-5-9', u'ip_address': u'172.24.5.9', u'fqdn': u'host-172-24-5-9.openstacklocal.'}, {u'hostname': u'host-2001-db8--a', u'ip_address': u'2001:db8::a', u'fqdn': u'host-2001-db8--a.openstacklocal.'}], u'device_id': u'646bb18b-da52-4ead-a635-012c72c1ccf1', u'name': u'', u'admin_state_up': True, u'network_id': u'31689320-95d7-44f9-932a-cc82c1bca2b4', u'dns_name': u'', u'binding:vnic_type': u'normal', u'tenant_id': u'', u'extra_subnets': []} create_dvr_fip_interfaces /opt/stack/new/neutron/neutron/agent/l3/dvr_local_router.py:427

  
  2015-09-29 21:10:34.043 DEBUG neutron.agent.l3.dvr_fip_ns [req-33413b07-784c-469e-8a35-0e20312a157e None None] add fip-namespace(fip-31689320-95d7-44f9-932a-cc82c1bca2b4) create /opt/stack/new/neutron/neutron/agent/l3/dvr_fip_ns.py:133

  Exit code: 0
   execute /opt/stack/new/neutron/neutron/agent/linux/utils.py:156
  2015-09-29 21:10:34.053 DEBUG neutron.agent.linux.utils [req-33413b07-784c-469e-8a35-0e20312a157e None None] Running command (rootwrap daemon): ['ip', 'netns', 'exec', 'fip-31689320-95d7-44f9-932a-cc82c1bca2b4', 'sysctl', '-w', 'net.ipv4.ip_forward=1'] execute_rootwrap_daemon /opt/stack/new/neutron/neutron/agent/linux/utils.py:101

  
  2015-09-29 21:10:34.084 ERROR neutron.agent.linux.utils [req-33413b07-784c-469e-8a35-0e20312a157e None None] 
  Command: ['ip', 'netns', 'exec', 'fip-31689320-95d7-44f9-932a-cc82c1bca2b4', 'sysctl', '-w', 'net.ipv4.ip_forward=1']
  Exit code: 1
  Stdin:
  Stdout:
  Stderr: seting the network namespace "fip-31689320-95d7-44f9-932a-cc82c1bca2b4" failed: Invalid argument

   
  This leads to a series of failures.

  This failure is seen only in the gate.

  This can be reproduced by constantly adding and deleting floatingip to
  a private IP, with multiple API worker threads.

  For more information you can also look at the "logstash" output below.

  http://logs.openstack.org/82/228582/8/check/gate-tempest-dsvm-neutron-
  dvr/9053337/logs/screen-q-l3.txt.gz?level=TRACE#_2015-09-29_21_10_34_084

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