debcrafters-packages team mailing list archive

[Trent Lloyd <1799265@xxxxxxxxxxxxxxxxxx>]

** Description changed:

  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)
  
  [ Impact ]
  
   * avahi-daemon consumes a large amount of CPU over time, particularly
- on laptop/desktop use cases. Many reports of it burning 100% CPU. In
- some cases it may also lead to increased network traffic that can impact
- WiFi networks if you have many Ubuntu laptops on the same network.
+ on laptop/desktop use cases. Many reports of it burning 100% CPU.
+ 
+  * This also leads to increased multicast traffic which has been
+ observed to cause high packet loss on WiFi networks at very large events
+ with many Ubuntu laptops on the same network.
  
   * This issue was fixed long ago fixed upstream, in Debian and in
  Kinetic+ but not previously backported to Jammy.
  
  [ Test Plan ]
  
   * It is not easy to reproduce the issue on demand, it tends to happen
  at random, only on busy networks possibly after many days or more of
  uptime. I don't currently have a way to easily reproduce the issue for
  SRU verification.
  
   * Upstream bug/diagnosis: https://bugs-devel.debian.org/cgi-
  bin/bugreport.cgi?bug=993051
+ 
+  * TODO: Add basic manual functional test plan
  
  [ Where problems could occur ]
  
   * This patch is a single line change for a missing cleanup, that has
  shipped in Kinetic+ for several years
  
   * The version shipping in those releases is substantially similar to
  the current release (no new upstream release)
  
   * However: avahi-daemon is a default installed package on Desktops, so
  there is a high potential impact
  
  [ Other Info ]
  
   * Upstream commit: https://github.com/avahi/avahi/pull/366
-  * Originally diagnosed/resolved in the Debian bug: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1799265
-  * This patch ships in later versions (even the current version), however I renamed the patch to prefix the LP bug number per the preferences, and added DEP3 headers.
+  * Originally diagnosed/resolved in the Debian bug: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1799265
+  * This patch ships in later versions (even the current version), however I renamed the patch to prefix the LP bug number per the preferences, and added DEP3 headers.

-- 
You received this bug notification because you are a member of
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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:
  Fix Released
Status in avahi source package in Jammy:
  Confirmed
Status in avahi source package in Noble:
  Fix Released

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)

  [ Impact ]

   * avahi-daemon consumes a large amount of CPU over time, particularly
  on laptop/desktop use cases. Many reports of it burning 100% CPU.

   * This also leads to increased multicast traffic which has been
  observed to cause high packet loss on WiFi networks at very large
  events with many Ubuntu laptops on the same network.

   * This issue was fixed long ago fixed upstream, in Debian and in
  Kinetic+ but not previously backported to Jammy.

  [ Test Plan ]

   * It is not easy to reproduce the issue on demand, it tends to happen
  at random, only on busy networks possibly after many days or more of
  uptime. I don't currently have a way to easily reproduce the issue for
  SRU verification.

   * Upstream bug/diagnosis: https://bugs-devel.debian.org/cgi-
  bin/bugreport.cgi?bug=993051

   * TODO: Add basic manual functional test plan

  [ Where problems could occur ]

   * This patch is a single line change for a missing cleanup, that has
  shipped in Kinetic+ for several years

   * The version shipping in those releases is substantially similar to
  the current release (no new upstream release)

   * However: avahi-daemon is a default installed package on Desktops,
  so there is a high potential impact

  [ Other Info ]

   * Upstream commit: https://github.com/avahi/avahi/pull/366
   * Originally diagnosed/resolved in the Debian bug: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1799265
   * This patch ships in later versions (even the current version), however I renamed the patch to prefix the LP bug number per the preferences, and added DEP3 headers.

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