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[Bug 1863213] [NEW] Spawning of DHCP processes fail: invalid netcat options

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Public bug reported:

Devstack master, ML2/OVS, CentOS 7, Python 3.6.

No DHCP servers running. Instances fail to get a DHCP offer.

$ ps aux | egrep "dhcp|dnsmasq"
vagrant    591  4.7  0.7 459196 114056 ?       Ss   07:26   0:33 /usr/bin/python3.6 /usr/local/bin/neutron-dhcp-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/dhcp_agent.ini
root      1057  0.0  0.0 102896  5472 ?        S    06:14   0:00 /sbin/dhclient -d -q -sf /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-eth0.pid -lf /var/lib/NetworkManager/dhclient-5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03-eth0.lease -cf /var/lib/NetworkManager/dhclient-eth0.conf eth0
root      1219 14.9  0.4 684168 77988 ?        Sl   07:26   1:43 /usr/bin/python3.6 /usr/local/bin/privsep-helper --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/dhcp_agent.ini --privsep_context neutron.privileged.default --privsep_sock_path /tmp/tmpxg0wq6j2/privsep.sock
root     14783  0.0  0.0 102896  2632 ?        Ss   07:29   0:00 dhclient -v o-hm0 -cf /etc/dhcp/octavia/dhclient.conf
vagrant  18136  0.0  0.0 112716   988 pts/2    S+   07:37   0:00 grep -E --color=auto dhcp|dnsmasq


Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Building initial lease file: /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/leases {{(pid=591) _output_init_lease_file /opt/stack/neutron/neutron/agent/linux/dhcp.py:681}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Done building initial lease file /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/leases with contents:
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: 1581752053 fa:16:3e:31:b7:ea 192.168.233.2 * *
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]:  {{(pid=591) _output_init_lease_file /opt/stack/neutron/neutron/agent/linux/dhcp.py:708}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Building host file: /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/host {{(pid=591) _output_hosts_file /opt/stack/neutron/neutron/agent/linux/dhcp.py:739}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Done building host file /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/host {{(pid=591) _output_hosts_file /opt/stack/neutron/neutron/agent/linux/dhcp.py:780}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Unable to access /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/pid; Error: [Errno 2] No such file or directory: '/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/pid' {{(pid=591) get_value_from_file /opt/stack/neutron/neutron/agent/linux/utils.py:262}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Running command (rootwrap daemon): ['ip', 'netns', 'exec', 'qdhcp-06d0ae0b-d730-4871-bef3-fa52e8638214', 'dnsmasq', '--no-hosts', '', '--pid-file=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/pid', '--dhcp-hostsfile=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/host', '--addn-hosts=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/addn_hosts', '--dhcp-optsfile=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/opts', '--dhcp-leasefile=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/leases', '--dhcp-match=set:ipxe,175', '--dhcp-userclass=set:ipxe6,iPXE', '--local-service', '--bind-dynamic', '--dhcp-range=set:subnet-879783df-943d-486d-8447-8730b9f3051a,192.168.233.0,static,255.255.255.0,86400s', '--dhcp-option-force=option:mtu,1450', '--dhcp-lease-max=256', '--conf-file=', '--domain=openstacklocal'] {{(pid=591) execute_rootwrap_daemon /opt/stack/neutron/neutron/agent/linux/utils.py:103}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: ERROR neutron.agent.linux.utils [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Exit code: 2; Stdin: ; Stdout: ; Stderr: /bin/ncat: unrecognized option '--no-hosts'
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: Ncat: Try `--help' or man(1) ncat for more information, usage options and help. QUITTING.
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: 
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Spawning DHCP process for network 06d0ae0b-d730-4871-bef3-fa52e8638214 failed; Error: Exit code: 2; Stdin: ; Stdout: ; Stderr: /bin/ncat: unrecognized option '--no-hosts'
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: Ncat: Try `--help' or man(1) ncat for more information, usage options and help. QUITTING.
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]:  {{(pid=591) _enable /opt/stack/neutron/neutron/agent/linux/dhcp.py:274}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Unable to access /opt/stack/data/neutron/dhcp/eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f/pid; Error: [Errno 2] No such file or directory: '/opt/stack/data/neutron/dhcp/eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f/pid' {{(pid=591) get_value_from_file /opt/stack/neutron/neutron/agent/linux/utils.py:262}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG oslo.privsep.daemon [-] privsep: reply[140123534145688]: (4, ['qdhcp-06d0ae0b-d730-4871-bef3-fa52e8638214', 'qdhcp-70e0b5b4-92c6-4dfc-8d5d-81e908170bdd', 'qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f']) {{(pid=1219) _call_back /usr/local/lib/python3.6/site-packages/oslo_privsep/daemon.py:475}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Running command (rootwrap daemon): ['ip', 'netns', 'exec', 'qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f', 'sysctl', '-w', 'net.ipv4.ip_nonlocal_bind=1'] {{(pid=591) execute_rootwrap_daemon /opt/stack/neutron/neutron/agent/linux/utils.py:103}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: WARNING neutron.agent.linux.ip_lib [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Setting ['sysctl', '-w', 'net.ipv4.ip_nonlocal_bind=1'] in namespace qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f failed: Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: .: neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.ip_lib [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Namespace (qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f) does not support setting net.ipv4.ip_nonlocal_bind, trying in root namespace {{(pid=591) set_ip_nonlocal_bind_for_namespace /opt/stack/neutron/neutron/agent/linux/ip_lib.py:1136}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Running command (rootwrap daemon): ['sysctl', '-w', 'net.ipv4.ip_nonlocal_bind=1'] {{(pid=591) execute_rootwrap_daemon /opt/stack/neutron/neutron/agent/linux/utils.py:103}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Running command (rootwrap daemon): ['ip', 'netns', 'exec', 'qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f', 'sysctl', '-w', 'net.ipv6.conf.default.accept_ra=0'] {{(pid=591) execute_rootwrap_daemon /opt/stack/neutron/neutron/agent/linux/utils.py:103}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: ERROR neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: 
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: WARNING neutron.agent.linux.ip_lib [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Setting ['sysctl', '-w', 'net.ipv6.conf.default.accept_ra=0'] in namespace qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f failed: Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: .: neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG oslo.privsep.daemon [-] privsep: reply[140123534145688]: (4, True) {{(pid=1219) _call_back /usr/local/lib/python3.6/site-packages/oslo_privsep/daemon.py:475}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG oslo.privsep.daemon [-] privsep: reply[140123534145688]: (4, {'mtu': 1450, 'qlen': 1000, 'state': 'UNKNOWN', 'qdisc': 'noqueue', 'brd': 'ff:ff:ff:ff:ff:ff', 'link/ether': 'fa:16:3e:a0:0b:a3', 'alias': None, 'allmulticast': False, 'link_kind': 'openvswitch'}) {{(pid=1219) _call_back /usr/local/lib/python3.6/site-packages/oslo_privsep/daemon.py:475}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG oslo.privsep.daemon [-] privsep: reply[140123534145688]: (4, ({'header': {'length': 36, 'type': 2, 'flags': 0, 'sequence_number': 255, 'pid': 9337, 'error': None, 'stats': Stats(qsize=0, delta=0, delay=0)}, 'event': 'NLMSG_ERROR'},)) {{(pid=1219) _call_back /usr/local/lib/python3.6/site-packages/oslo_privsep/daemon.py:475}}
Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Reusing existing device: tap5337fbe0-46. {{(pid=591) setup /opt/stack/neutron/neutron/agent/linux/dhcp.py:1586}}

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1863213

Title:
  Spawning of DHCP processes fail: invalid netcat options

Status in neutron:
  New

Bug description:
  Devstack master, ML2/OVS, CentOS 7, Python 3.6.

  No DHCP servers running. Instances fail to get a DHCP offer.

  $ ps aux | egrep "dhcp|dnsmasq"
  vagrant    591  4.7  0.7 459196 114056 ?       Ss   07:26   0:33 /usr/bin/python3.6 /usr/local/bin/neutron-dhcp-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/dhcp_agent.ini
  root      1057  0.0  0.0 102896  5472 ?        S    06:14   0:00 /sbin/dhclient -d -q -sf /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-eth0.pid -lf /var/lib/NetworkManager/dhclient-5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03-eth0.lease -cf /var/lib/NetworkManager/dhclient-eth0.conf eth0
  root      1219 14.9  0.4 684168 77988 ?        Sl   07:26   1:43 /usr/bin/python3.6 /usr/local/bin/privsep-helper --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/dhcp_agent.ini --privsep_context neutron.privileged.default --privsep_sock_path /tmp/tmpxg0wq6j2/privsep.sock
  root     14783  0.0  0.0 102896  2632 ?        Ss   07:29   0:00 dhclient -v o-hm0 -cf /etc/dhcp/octavia/dhclient.conf
  vagrant  18136  0.0  0.0 112716   988 pts/2    S+   07:37   0:00 grep -E --color=auto dhcp|dnsmasq


  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Building initial lease file: /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/leases {{(pid=591) _output_init_lease_file /opt/stack/neutron/neutron/agent/linux/dhcp.py:681}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Done building initial lease file /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/leases with contents:
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: 1581752053 fa:16:3e:31:b7:ea 192.168.233.2 * *
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]:  {{(pid=591) _output_init_lease_file /opt/stack/neutron/neutron/agent/linux/dhcp.py:708}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Building host file: /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/host {{(pid=591) _output_hosts_file /opt/stack/neutron/neutron/agent/linux/dhcp.py:739}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Done building host file /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/host {{(pid=591) _output_hosts_file /opt/stack/neutron/neutron/agent/linux/dhcp.py:780}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Unable to access /opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/pid; Error: [Errno 2] No such file or directory: '/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/pid' {{(pid=591) get_value_from_file /opt/stack/neutron/neutron/agent/linux/utils.py:262}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Running command (rootwrap daemon): ['ip', 'netns', 'exec', 'qdhcp-06d0ae0b-d730-4871-bef3-fa52e8638214', 'dnsmasq', '--no-hosts', '', '--pid-file=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/pid', '--dhcp-hostsfile=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/host', '--addn-hosts=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/addn_hosts', '--dhcp-optsfile=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/opts', '--dhcp-leasefile=/opt/stack/data/neutron/dhcp/06d0ae0b-d730-4871-bef3-fa52e8638214/leases', '--dhcp-match=set:ipxe,175', '--dhcp-userclass=set:ipxe6,iPXE', '--local-service', '--bind-dynamic', '--dhcp-range=set:subnet-879783df-943d-486d-8447-8730b9f3051a,192.168.233.0,static,255.255.255.0,86400s', '--dhcp-option-force=option:mtu,1450', '--dhcp-lease-max=256', '--conf-file=', '--domain=openstacklocal'] {{(pid=591) execute_rootwrap_daemon /opt/stack/neutron/neutron/agent/linux/utils.py:103}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: ERROR neutron.agent.linux.utils [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Exit code: 2; Stdin: ; Stdout: ; Stderr: /bin/ncat: unrecognized option '--no-hosts'
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: Ncat: Try `--help' or man(1) ncat for more information, usage options and help. QUITTING.
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: 
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-4193fed2-5a2d-4c24-b3b1-72673dc2e1fe None None] Spawning DHCP process for network 06d0ae0b-d730-4871-bef3-fa52e8638214 failed; Error: Exit code: 2; Stdin: ; Stdout: ; Stderr: /bin/ncat: unrecognized option '--no-hosts'
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: Ncat: Try `--help' or man(1) ncat for more information, usage options and help. QUITTING.
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]:  {{(pid=591) _enable /opt/stack/neutron/neutron/agent/linux/dhcp.py:274}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Unable to access /opt/stack/data/neutron/dhcp/eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f/pid; Error: [Errno 2] No such file or directory: '/opt/stack/data/neutron/dhcp/eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f/pid' {{(pid=591) get_value_from_file /opt/stack/neutron/neutron/agent/linux/utils.py:262}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG oslo.privsep.daemon [-] privsep: reply[140123534145688]: (4, ['qdhcp-06d0ae0b-d730-4871-bef3-fa52e8638214', 'qdhcp-70e0b5b4-92c6-4dfc-8d5d-81e908170bdd', 'qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f']) {{(pid=1219) _call_back /usr/local/lib/python3.6/site-packages/oslo_privsep/daemon.py:475}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Running command (rootwrap daemon): ['ip', 'netns', 'exec', 'qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f', 'sysctl', '-w', 'net.ipv4.ip_nonlocal_bind=1'] {{(pid=591) execute_rootwrap_daemon /opt/stack/neutron/neutron/agent/linux/utils.py:103}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: WARNING neutron.agent.linux.ip_lib [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Setting ['sysctl', '-w', 'net.ipv4.ip_nonlocal_bind=1'] in namespace qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f failed: Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: .: neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.ip_lib [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Namespace (qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f) does not support setting net.ipv4.ip_nonlocal_bind, trying in root namespace {{(pid=591) set_ip_nonlocal_bind_for_namespace /opt/stack/neutron/neutron/agent/linux/ip_lib.py:1136}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Running command (rootwrap daemon): ['sysctl', '-w', 'net.ipv4.ip_nonlocal_bind=1'] {{(pid=591) execute_rootwrap_daemon /opt/stack/neutron/neutron/agent/linux/utils.py:103}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Running command (rootwrap daemon): ['ip', 'netns', 'exec', 'qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f', 'sysctl', '-w', 'net.ipv6.conf.default.accept_ra=0'] {{(pid=591) execute_rootwrap_daemon /opt/stack/neutron/neutron/agent/linux/utils.py:103}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: ERROR neutron.agent.linux.utils [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: 
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: WARNING neutron.agent.linux.ip_lib [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Setting ['sysctl', '-w', 'net.ipv6.conf.default.accept_ra=0'] in namespace qdhcp-eb8e5a83-ca01-4cb0-82ec-d1d4ecc14e9f failed: Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: .: neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG oslo.privsep.daemon [-] privsep: reply[140123534145688]: (4, True) {{(pid=1219) _call_back /usr/local/lib/python3.6/site-packages/oslo_privsep/daemon.py:475}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG oslo.privsep.daemon [-] privsep: reply[140123534145688]: (4, {'mtu': 1450, 'qlen': 1000, 'state': 'UNKNOWN', 'qdisc': 'noqueue', 'brd': 'ff:ff:ff:ff:ff:ff', 'link/ether': 'fa:16:3e:a0:0b:a3', 'alias': None, 'allmulticast': False, 'link_kind': 'openvswitch'}) {{(pid=1219) _call_back /usr/local/lib/python3.6/site-packages/oslo_privsep/daemon.py:475}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG oslo.privsep.daemon [-] privsep: reply[140123534145688]: (4, ({'header': {'length': 36, 'type': 2, 'flags': 0, 'sequence_number': 255, 'pid': 9337, 'error': None, 'stats': Stats(qsize=0, delta=0, delay=0)}, 'event': 'NLMSG_ERROR'},)) {{(pid=1219) _call_back /usr/local/lib/python3.6/site-packages/oslo_privsep/daemon.py:475}}
  Feb 14 07:34:13 localhost.localdomain neutron-dhcp-agent[591]: DEBUG neutron.agent.linux.dhcp [None req-24ab0d08-e2ab-4216-b3ce-cac571f5779e None None] Reusing existing device: tap5337fbe0-46. {{(pid=591) setup /opt/stack/neutron/neutron/agent/linux/dhcp.py:1586}}

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