[Bug 1254357] [NEW] Avahi-daemon-check-dns.sh takes too much time on every connecting to network

[wm]

Public bug reported:

Every time I connect to network using NetworkManager, 10s is spent on
checking if avahi may be run, which is majority of connecting time.

Control flow is as follows -> NetworkManager -> /sbin/resolvconf ->
/etc/resolvconf/update.d/libc -> /etc/resolvconf/update-libc.d/avahi-
daemon -> /usr/lib/avahi/avahi-daemon-check-dns.sh -> host -t soa .local

If everything is alright (no .local domain, avahi may be run) host shall fail due to timeout, which by default takes 10s.
I believe either dns lookup timeout should be lowered (host -t soa -W 1 .local) or the avahi-daemon-check-dns.sh script shall be run asynchronously.

It is particularly annoying when waking up from suspend - resume takes
3s, main part of network configuration 4s, but then avahi 10s.

To reproduce:
nmcli d disconnect iface <interface>; time nmcli c up id <your network>
chmod -x  /usr/lib/avahi/avahi-daemon-check-dns.sh
nmcli d disconnect iface <interface>; time nmcli c up id <your network>
Or just:
time /usr/lib/avahi/avahi-daemon-check-dns.sh

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: avahi-daemon 0.6.31-2ubuntu4.1
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Sun Nov 24 00:36:05 2013
InstallationDate: Installed on 2013-11-16 (7 days ago)
InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
MarkForUpload: True
SourcePackage: avahi
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: avahi (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug package-from-proposed saucy

** Patch added: "Proposed fix: lower dns lookup timeout"
   https://bugs.launchpad.net/bugs/1254357/+attachment/3915667/+files/avahi-daemon-check-dns-lower-timeout.patch

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https://bugs.launchpad.net/bugs/1254357

Title:
  Avahi-daemon-check-dns.sh takes too much time on every connecting to
  network

Status in “avahi” package in Ubuntu:
  New

Bug description:
  Every time I connect to network using NetworkManager, 10s is spent on
  checking if avahi may be run, which is majority of connecting time.

  Control flow is as follows -> NetworkManager -> /sbin/resolvconf ->
  /etc/resolvconf/update.d/libc -> /etc/resolvconf/update-libc.d/avahi-
  daemon -> /usr/lib/avahi/avahi-daemon-check-dns.sh -> host -t soa
  .local

  If everything is alright (no .local domain, avahi may be run) host shall fail due to timeout, which by default takes 10s.
  I believe either dns lookup timeout should be lowered (host -t soa -W 1 .local) or the avahi-daemon-check-dns.sh script shall be run asynchronously.

  It is particularly annoying when waking up from suspend - resume takes
  3s, main part of network configuration 4s, but then avahi 10s.

  To reproduce:
  nmcli d disconnect iface <interface>; time nmcli c up id <your network>
  chmod -x  /usr/lib/avahi/avahi-daemon-check-dns.sh
  nmcli d disconnect iface <interface>; time nmcli c up id <your network>
  Or just:
  time /usr/lib/avahi/avahi-daemon-check-dns.sh

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: avahi-daemon 0.6.31-2ubuntu4.1
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  Date: Sun Nov 24 00:36:05 2013
  InstallationDate: Installed on 2013-11-16 (7 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
  MarkForUpload: True
  SourcePackage: avahi
  UpgradeStatus: No upgrade log present (probably fresh install)

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