[Pkg-utopia-maintainers] Bug#780981: avahi-daemon: Avahi-daemon loses name when used with dynamic IPv6
Wesley W. Terpstra
terpstra at debian.org
Sun Mar 22 17:52:10 UTC 2015
Package: avahi-daemon
Version: 0.6.31-4+b2
Severity: important
Dear Maintainer,
FYI, This is clearly an upstream bug, but I could not figure out the upstream
BTS. Since this affects jessie, I figure it also important to mention here.
Please forward this bug upstream.
So, here's the problem. Every night at 4am or so my home internet router (a
fritzbox) resets its internet connection. This causes my external IPv6 and
IPv4 addresses to change. When this happens avahi-daemon loses its name.
Normally, a ps listing shows:
24747 ? S 0:00 avahi-daemon: running [pumpkin.local]
When the bug kicks in, it looks like:
24145 ? S 0:00 avahi-daemon: running [pumpkin-2.local]
In daemon.log, the tell-tale symptom is the following line:
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Host name conflict, retrying with pumpkin-2
At this point, the system no longer responds to its own name and all sorts
of higher-level network applications start to fail. The severity depends on
how many services depend avahi. In my case, it breaks time machine backups
from all macs in the house, cacti error logging, nfs clients, and xbmc.
So, for me, this is a severe bug that happens about once a week. However,
as I'll explain, the problem only affects people with a perfect storm of
configuarion options.
You can find reports of this bug going back a year all over the internet.
However, I went a bit further than those reports and modified avahi-daemon
to print out WHAT the conflict is that leads to this problem.
The issue is this: when your router resets its internet connection, its
assigned *IPv6* address changes. Local IPv6 addresses are assigned in the
low 64-bits of the assigned address. Thus, hosts in the internal network
will see their IPv6 address change, but not their NAT'd IPv4 address.
These things are necessary to trigger the bug:
You must be using IPv6 (IPv4 NAT'd IPs do not change)
Your system must receive its IPv6 address dynamically (no static address)
Your IPv6 subnet must change for some reason (modern router reconnecting)
The bug also has some sort of race condition involved.
When I added debug statements to the daemon, the problem became much more
severe and it could easily end up with pumpkin-87 before finally succeeding.
Before the additional print statements were added, the failure would happen
with about a 1/10 change every time the network address changed. Thus, I
imagine on a slower system the bug appears more often.
Here is an extract from the logs of my modified avahi-daemon:
These messages appear harmless and happen fairly often:
Mar 22 17:41:47 pumpkin avahi-daemon[20334]: Registering new address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:41:47 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:23 pumpkin avahi-daemon[20334]: Registering new address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:23 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:48 pumpkin avahi-daemon[20334]: Registering new address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:48 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.
At this point I just reset my internet connection:
Mar 22 17:42:58 pumpkin avahi-daemon[20334]: Registering new address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:58 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for fe80::ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:dc21:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:bbeb:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:1b96:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:e532:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:cc8d:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:5036:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:f4d8:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:da80:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:39f6:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:bacf:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:558a:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:8969:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for fe80::ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:dc21:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:bbeb:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:1b96:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:e532:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:cc8d:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:5036:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:f4d8:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:da80:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:39f6:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:bacf:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:558a:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:8969:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for fe80::ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:dc21:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:bbeb:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:1b96:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:e532:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:cc8d:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:5036:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:f4d8:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:da80:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:39f6:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:bacf:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:558a:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:42:59 pumpkin avahi-daemon[20334]: Registering new address record for 4006:8969:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Here is the extra debug information I added:
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Conflict. Ours = [pumpkin.local#011IN#011AAAA 4006:8969:c0a8:b22a:ae22:bff:fe50:73ea ; ttl=120]. Theirs = [pumpkin.local#011IN#011AAAA 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea ; ttl=120]. Won = 0, lost = 1
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Received conflicting probe [pumpkin.local#011IN#011AAAA 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea ; ttl=120]. Local host lost. Withdrawing.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for fe80::ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 2003:71:ce51:8e00:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:dc21:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:bbeb:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:1b96:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:e532:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:cc8d:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:5036:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:f4d8:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:da80:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:39f6:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:bacf:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:558a:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing address record for 192.168.178.23 on br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing workstation service for br0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing workstation service for tap0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing workstation service for eth0.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Withdrawing workstation service for lo.
Here is the tell-tale log message that shows the bug:
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Host name conflict, retrying with pumpkin-2
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for fe80::ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 2003:71:ce51:8e00:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:dc21:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:bbeb:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:1b96:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:e532:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:cc8d:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:5036:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:f4d8:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:da80:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:39f6:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:bacf:c0a8:b23f:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:558a:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 4006:8969:c0a8:b22a:ae22:bff:fe50:73ea on br0.*.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering new address record for 192.168.178.23 on br0.IPv4.
Mar 22 17:43:00 pumpkin avahi-daemon[20334]: Registering HINFO record with values 'X86_64'/'LINUX'.
Here it fails again:
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Conflict. Ours = [pumpkin-2.local#011IN#011AAAA 4006:8969:c0a8:b22a:ae22:bff:fe50:73ea ; ttl=120]. Theirs = [pumpkin-2.local#011IN#011AAAA 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea ; ttl=120]. Won = 0, lost = 1
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Received conflicting probe [pumpkin-2.local#011IN#011AAAA 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea ; ttl=120]. Local host lost. Withdrawing.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for fe80::ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:3c58:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 2003:71:ce51:8e00:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:dc21:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:bbeb:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:1b96:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:e532:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:cc8d:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:5036:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:f4d8:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:da80:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:39f6:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:bacf:c0a8:b23f:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:558a:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 4006:e26a:c0a8:b22a:ae22:bff:fe50:73ea on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Withdrawing address record for 192.168.178.23 on br0.
Mar 22 17:43:01 pumpkin avahi-daemon[20334]: Host name conflict, retrying with pumpkin-3
... this goes on to repeat until around pumpkin-17.
I did not dig further into properly fixing this bug, as I think the avahi
authors should now have sufficient information to reproduce the problem.
A simple/easy work-around is to modify avahi-core/server.c:incoming_probe:
Change the "if (won)" to "if (1)".
This makes your server will always "win" in a conflict. Probably this is a
bad idea if there is possibility of two hosts with the same name on the same
network. However, I'll wager that less people would be affected by this
INTENTIONAL bug than the current bug, which affects nearly anyone using IPv6.
-- System Information:
Debian Release: 8.0
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.18.9 (SMP w/4 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages avahi-daemon depends on:
ii adduser 3.113+nmu3
ii bind9-host [host] 1:9.9.5.dfsg-9
ii dbus 1.8.16-1
ii host 1:9.9.5.dfsg-9
ii init-system-helpers 1.22
ii libavahi-common3 0.6.31-4+b2
ii libavahi-core7 0.6.31-4+b2
ii libc6 2.19-15
ii libcap2 1:2.24-7
ii libdaemon0 0.14-6
ii libdbus-1-3 1.8.16-1
ii libexpat1 2.1.0-6+b3
ii lsb-base 4.1+Debian13+nmu1
Versions of packages avahi-daemon recommends:
ii libnss-mdns 0.10-6
Versions of packages avahi-daemon suggests:
pn avahi-autoipd <none>
-- Configuration Files:
/etc/avahi/avahi-daemon.conf changed [not included]
/etc/avahi/hosts changed [not included]
-- no debconf information
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