[Pkg-utopia-maintainers] Bug#922630: avahi-daemon high cpu usage

[David Miguel Susano Pinto]

Package: avahi-daemon
Version: 0.7-4+b1
Severity: normal

Dear Maintainer,

avahi-dameon shows a very high cpu usage and I found no useful
messages on the logs.  Restarting the daemon does nothing.  When I ran
the daemon with '--debug' option, I see hundreds of lines like this on
syslog:

    Received response from host 10.31.19.92 with invalid source port 63227
    Received response from host 10.31.20.38 with invalid source port 57554
    Received response from host 10.31.40.164 with invalid source port 58307
    Received response from host 10.31.44.4 with invalid source port 54151

It's always those four IP addresses and those four ports.  There's
many other entries but those are the ones that look the most like an
error.

This issue only happens at a specific network (eduroam wifi network at
my university).  There are no problems on many other networks so I
think there may be something odd with this specific university.

However, I also think that avahi should be a bit more resilient.  Even
if there is an issue on the network, it should not bring a laptop to a
halt.  avahi-daemon goes at 100% CPU usage nonstop.  The only reason I
can do any work at all is that this is a quite beffy quadcore laptop.


-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages avahi-daemon depends on:
ii  adduser            3.118
ii  bind9-host [host]  1:9.11.5.P1+dfsg-1
ii  dbus               1.12.12-1
ii  libavahi-common3   0.7-4+b1
ii  libavahi-core7     0.7-4+b1
ii  libc6              2.28-6
ii  libcap2            1:2.25-2
ii  libdaemon0         0.14-7
ii  libdbus-1-3        1.12.12-1
ii  libexpat1          2.2.6-1
ii  lsb-base           10.2018112800

Versions of packages avahi-daemon recommends:
ii  libnss-mdns  0.14.1-1

Versions of packages avahi-daemon suggests:
ii  avahi-autoipd  0.7-4+b1

-- no debconf information