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

[Matt]

Ok, the issue seems gone! I cannot recreate it, and I'm not sure why.

First, thank you for the quick reply. When I first read your response, I
ran the

`echo "deb http://ddebs.ubuntu.com $(lsb_release -cs) main restricted
universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ddebs.list`

command, and then realized the CPU wasn't being maximally taxed so I
didn't continue and decided to try again later. I then ran the disable
and stop commands to get rid of the issue temporarily.

I later decided to try to recreate the issue, so I ran the corresponding
enable and start commands, and the CPU didn't increase. I then restarted
my system a couple times, but have yet to see the high CPU and bad
networking issues. I can confirm that the avahi-daemon is indeed
running. Running `ps aux | grep avahi` yields,

avahi      915  0.0  0.0  18920  3868 ?        Ss   23:46   0:00 avahi-daemon: running [tomboy.local]
avahi     1035  0.0  0.0  18716   348 ?        S    23:46   0:00 avahi-daemon: chroot helper

Since my initial post I have performed a couple normal package updates,
so perhaps one of them solved the issue? The Kubuntu 18.10 I am on is a
new release, so perhaps something was discovered and fixed.

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

Title:
  avahi-daemon high cpu, unusable networking

Status in avahi package in Ubuntu:
  Incomplete

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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