[Pkg-utopia-maintainers] Bug#873573: avahi-daemon: packet loss

[Allan Wind]

Package: avahi-daemon
Version: 0.6.32-2
Severity: important

Dear Maintainer,

I installed Debian 9.1 on a Lenovo P50 and with no customizations other
than what the installer afforded me I was observing packet loss every
few minutes.  ssh to this host would hang for seconds to minutes at a
time, say, every few minutes.  I installed mtr on a remote host, and
within 200 to 250 packets it would report significant packet loss.
tcpdump showed that ping packets were not being received on this host
for almost a minute.  tcpdump from remote host showed pings being sent
every second but no response.  I duplicated packet loss with a 3rd
remote host. Replaced the cable and switch between this and remote host,
and were still able to reproduce the issue.

By chance, I booted this host into recovery mode, and added my ethernet
interface to /etc/network/interfaces then systemctl start networking.
Then retried the mtr scenario and found no packet loss.  I then
bi-sected between recovery (rescue.target?) and graphical.target to
determine that if I did not start avahi-daemon or services that depends
on it I would not be seeing packet loss along these lines (commented out
lines would cause packet loss):

#!/bin/bash
systemctl start basic.target
systemctl start anacron.service
systemctl start apache2.service
#systemctl start avahi-daemon.service
systemctl start console-setup.service
systemctl start cron.service
#systemctl start cups-browsed.service
#systemctl start cups.path
systemctl start dbus.service
systemctl start hddtemp.service
systemctl start lm-sensors.service
systemctl start ModemManager.service
systemctl start networking.service
systemctl start NetworkManager.service
systemctl start pppd-dns.service
systemctl start rsyslog.service
systemctl start speech-dispatcher.service
systemctl start ssh.service
systemctl start systemd-ask-password-wall.path
systemctl start systemd-logind.service
systemctl start systemd-update-utmp-runlevel.service
systemctl start systemd-user-sessions.service

Finally, I apt-get pruge avahi-daemon and rebooted and not seeing any
packet loss since.

ifconfig did not show any errors on this or rmeote end.


-- System Information:
Debian Release: 9.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8), LANGUAGE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages avahi-daemon depends on:
ii  adduser              3.115
ii  bind9-host [host]    1:9.10.3.dfsg.P4-12.3+deb9u2
ii  dbus                 1.10.18-1
ii  host                 1:9.10.3.dfsg.P4-12.3+deb9u2
ii  init-system-helpers  1.48
ii  libavahi-common3     0.6.32-2
ii  libavahi-core7       0.6.32-2
ii  libc6                2.24-11+deb9u1
ii  libcap2              1:2.25-1
ii  libdaemon0           0.14-6
ii  libdbus-1-3          1.10.18-1
ii  libexpat1            2.2.0-2+deb9u1
ii  lsb-base             9.20161125

Versions of packages avahi-daemon recommends:
ii  libnss-mdns  0.10-8

Versions of packages avahi-daemon suggests:
ii  avahi-autoipd  0.6.32-2

-- no debconf information