[2.4a2] crash in observ-mdns

[Mark Shuttleworth]

I see this fairly frequently in logs:

Mar 18 21:51:09 maas-2 sh[802]: 2018-03-18 21:51:09 provisioningserver.utils.services: [info] observe-arp[enp2s0]: tcpdump: listening on enp2s0, link-type EN10MB (Ethernet), capture size 64 bytes
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[0] = /usr/sbin/maas-dhcp-helper
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[1] = notify
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[2] = --action
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[3] = commit
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[4] = --mac
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[5] = b8:8a:60:e0:e9:ad
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[6] = --ip-family
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[7] = ipv4
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[8] = --ip
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[9] = 192.168.93.132
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[10] = --lease-time
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[11] = 600
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[12] = --hostname
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[13] = claire-ThinkPad-T460s
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[14] = --socket
Mar 18 21:51:10 maas-2 dhcpd[1124]: execute_statement argv[15] = /var/lib/maas/dhcpd.sock
Mar 18 21:51:10 maas-2 dhcpd[1124]: DHCPREQUEST for 192.168.93.132 from b8:8a:60:e0:e9:ad (claire-ThinkPad-T460s) via enp2s0
Mar 18 21:51:10 maas-2 dhcpd[1124]: DHCPACK on 192.168.93.132 to b8:8a:60:e0:e9:ad (claire-ThinkPad-T460s) via enp2s0
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: Traceback (most recent call last):
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/maas/maas-common", line 87, in <module>
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: main()
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/maas/maas-common", line 83, in main
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: run()
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/maas/maas-common", line 52, in run
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: from provisioningserver.__main__ import main
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/python3/dist-packages/provisioningserver/__main__.py", line 55, in <module>
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: main()
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/python3/dist-packages/provisioningserver/utils/script.py", line 91, in __call__
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: self.execute(argv)
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/python3/dist-packages/provisioningserver/utils/script.py", line 86, in execute
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: args.handler.run(args)
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/python3/dist-packages/provisioningserver/utils/avahi.py", line 221, in run
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: _observe_mdns(reader, output, args.verbose)
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/python3/dist-packages/provisioningserver/utils/avahi.py", line 145, in _observe_mdns
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: for event in observer(events):
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/python3/dist-packages/provisioningserver/utils/avahi.py", line 161, in _observe_resolver_found
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: for event in filter(_p_resolver_found, events):
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/python3/dist-packages/provisioningserver/utils/avahi.py", line 125, in _extract_mdns_events
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: for event in map(parse_avahi_event, lines):
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: File "/usr/lib/python3.6/codecs.py", line 321, in decode
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: (result, consumed) = self._buffer_decode(data, self.errors, final)
Mar 18 21:51:12 maas-2 sh[802]: 2018-03-18 21:51:12 provisioningserver.utils.services: [info] observe-mdns: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xcb in position 233: invalid continuation byte
Mar 18 21:51:13 maas-2 dhcpd[1124]: DHCPDISCOVER from 00:e0:67:05:77:49 via enp2s0
Mar 18 21:51:13 maas-2 dhcpd[1124]: DHCPOFFER on 192.168.93.5 to 00:e0:67:05:77:49 via enp2s0