[Pkg-utopia-maintainers] Bug#929010: Bug#929010: avahi-daemon: /etc/network/if-post-down.d/avahi-daemon is slow on eth0

[Vincent Lefevre]

On 2019-05-15 12:50:49 +0200, Michael Biebl wrote:
> Which part of /usr/lib/avahi/avahi-daemon-check-dns.sh is taking so long?
> Can you add a "set -x" and then manually invoke "ifdown eth0"

I get:

+ PATH=/bin:/usr/bin:/sbin:/usr/sbin
+ RUNDIR=/var/run/avahi-daemon/
+ DISABLE_TAG=/var/run/avahi-daemon//disabled-for-unicast-local
+ NS_CACHE=/var/run/avahi-daemon//checked_nameservers
+ AVAHI_DAEMON_DETECT_LOCAL=1
+ test -f /etc/default/avahi-daemon
+ . /etc/default/avahi-daemon
+ AVAHI_DAEMON_DETECT_LOCAL=1
+ [ 1 != 1 ]
+ dns_reachable
+ grep -q nameserver /etc/resolv.conf
+ 
+ egrep -q nameserver 127.0.0.1|::1 /etc/resolv.conf
+ 
+ return 0
+ dns_needs_check
+ TMP_CACHE=/var/run/avahi-daemon//checked_nameservers.8379
+ RET=0
+ ensure_rundir
+ [ ! -d /var/run/avahi-daemon/ ]
+ cat /etc/resolv.conf
+ grep nameserver
+ sort
+ [ -e /var/run/avahi-daemon//checked_nameservers ]
+ mv /var/run/avahi-daemon//checked_nameservers.8379 /var/run/avahi-daemon//checked_nameservers
+ return 0
+ dns_has_local
+ [ -n  ]
+ LC_ALL=C host -t soa local.
+ OUT=;; connection timed out; no servers could be reached
+ [ 1 -eq 0 ]
+ rm -f /var/run/avahi-daemon//checked_nameservers
+ return 1
+ enable_avahi
+ [ -e /var/run/avahi-daemon//disabled-for-unicast-local ]
+ exit 0

with several seconds between

+ LC_ALL=C host -t soa local.

and

+ OUT=;; connection timed out; no servers could be reached

At least, this is consistent with the timeout.

Moreover, I don't understand why it tries to reach servers as eth0
is down (this is called in an if-post-down.d script).

-- 
Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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