Hi Matt, Thanks for the report. I'd like to profile avahi using perf to get information on what functions are being executed. Could you run the following commands to generate such data?
If you are unsure about any of this feel free to ask. echo "deb http://ddebs.ubuntu.com $(lsb_release -cs) main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ddebs.list sudo apt update sudo apt install linux-tools-generic ubuntu-dbgsym-keyring linux-cloud-tools-generic sudo apt update sudo apt install avahi-daemon-dbgsym libavahi-common3-dbgsym libavahi-core7-dbgsym libavahi-glib1-dbgsym libc6-dbgsym libcap2-dbgsym libdaemon0-dbgsym libdbus-1-3-dbgsym libecore-avahi1-dbgsym libexpat1-dbgsym libgcrypt20-dbgsym libgpg-error0-dbgsym liblz4-1-dbgsym liblzma5-dbgsym libnss-systemd-dbgsym libsystemd0-dbgsym then to record a profile: sudo perf record -p $(cat /run/avahi-daemon/pid) -g -- sleep 60 This will exit after 60 seconds, then generate perf script output: sudo perf script > avahi-perf.script.txt sudo perf report -n --stdio > avahi-perf.report.txt And then upload the resulting avahi-perf.script.txt and avahi- perf.report.txt for analysis. You'll want to make sure avahi is using 100%+ CPU at the time you do this. Lastly from the same bootup, can you please collect the log info from journalctl: journalctl -u avahi-daemon --no-pager --no-tail > avahi-journal.txt Thanks for reporting the bug! Hopefully we can figure it out. In the mean time if you want to disable avahi you can try this: sudo systemctl disable avahi-daemon.socket avahi-daemon sudo systemctl stop avahi-daemon.socket avahi-daemon (to re-enable change to start and enable) Regards, Trent -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to avahi in Ubuntu. https://bugs.launchpad.net/bugs/1799265 Title: avahi-daemon high cpu, unusable networking Status in avahi package in Ubuntu: New 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1799265/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
