[Bug 1799265] Re: avahi-daemon high cpu, unusable networking

[Philkav1989]

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

Status in Avahi:
  New
Status in avahi package in Ubuntu:
  Triaged

Bug description:
  Currently running Kubuntu 18.10, Dell XPS 13 9350

  Since updating from Kubuntu 18.04 to 18.10, the avahi-daemon has been
  consistently hampering network performance and using CPU for long
  periods of time.

  When booting machine from off state, avahi-daemon uses an entire CPU
  at max load for approx 10 minutes. During this time, internet
  connectivity via wifi is essentially unusable. The wifi connection is
  good, but it seems that http transactions are cutoff mid-way so no
  webpage is able to load.

  When waking from sleep, the avahi-daemon causes similar symptoms, but
  with less than 1 full cpu usage, and with somewhat less degraded
  network performance, but still quite unusable.

  I have never had issues with avahi prior to the 18.10 upgrade, so I am
  fairly confident the issue is rooted in that change.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: avahi-daemon 0.7-4ubuntu2
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Mon Oct 22 10:00:34 2018
  InstallationDate: Installed on 2017-07-24 (455 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   LD_PRELOAD=<set>
   SHELL=/bin/bash
  SourcePackage: avahi
  UpgradeStatus: Upgraded to cosmic on 2018-10-20 (2 days ago)

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