Also, startlingly, I seem to have thousands of ipv6 addresses assigned
to enp0s8:

ip addr
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP 
group default qlen 1000
    link/ether 08:00:27:47:xx:xx brd ff:ff:ff:ff:ff:ff
    inet 10.169.110.168/21 brd 10.169.111.255 scope global dynamic 
noprefixroute enp0s8
       valid_lft 6027sec preferred_lft 6027sec
    inet6 2606:b400:818:61:c70:xxxx:xxxx:xxxx/64 scope global temporary dynamic 
       valid_lft 604796sec preferred_lft 86280sec
    inet6 2606:b400:818:61:eece:xxxx:xxxx:xxxx/64 scope global dynamic 
mngtmpaddr noprefixroute 
       valid_lft 2591939sec preferred_lft 604739sec
    inet6 2606:b400:818:64:c70:xxxx:xxxx:xxxx/64 scope global temporary dynamic 
       valid_lft 604796sec preferred_lft 86280sec
    inet6 2606:b400:818:64:6745:xxxx:xxxx:xxxx/64 scope global dynamic 
mngtmpaddr noprefixroute 
       valid_lft 2591996sec preferred_lft 604796sec
    inet6 2606:b400:818:64:d7:xxxx:xxxx:xxxx0/64 scope global temporary dynamic 
       valid_lft 604740sec preferred_lft 86224sec
    .... 
    ....

# ip addr | grep inet6 | cat -n

  6294      inet6 2606:b400:818:64:XXXX:XXXX:XXXX:XXXX/64 scope global 
temporary deprecated dynamic 
  6295      inet6 2606:b400:818:61:XXXX:XXXX:XXXX:XXXX/64 scope global 
temporary deprecated dynamic 
  6296      inet6 2606:b400:818:61:XXXX:XXXX:XXXX:XXXX/64 scope global 
temporary deprecated dynamic 
  6297      inet6 2606:b400:818:64:XXXX:XXXX:XXXX:XXXX/64 scope global 
temporary deprecated dynamic 
  6298      inet6 2606:b400:818:64:XXXX:XXXX:XXXX:XXXX/64 scope global 
temporary deprecated dynamic 
  6299      inet6 2606:b400:818:61:XXXX:XXXX:XXXX:XXXXc/64 scope global 
temporary deprecated dynamic 
  6300      inet6 2606:b400:818:61:XXXX:XXXX:XXXX:XXXX/64 scope global 
temporary deprecated dynamic 
  6301      inet6 2606:b400:818:64:XXXX:XXXX:XXXX:XXXX/64 scope global 
temporary deprecated dynamic 
  6302      inet6 2606:b400:818:64:XXXX:XXXX:XXXX:XXXX/64 scope global 
temporary deprecated dynamic 
  6303      inet6 2606:b400:818:61:XXXX:XXXX:XXXX:XXXX/64 scope global 
temporary deprecated dynamic 
  6304      inet6 fe80::4721:XXXX:XXXX:XXXX/64 scope link noprefixroute

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https://bugs.launchpad.net/bugs/1799265

Title:
  avahi-daemon high cpu, unusable networking

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