[Bug 1752411] Re: bind9-host, avahi-daemon-check-dns.sh hang forever causes network connections to get stuck

[Andreas Hasenack]

In https://bugs.launchpad.net/ubuntu/+source/bind9/+bug/1797926 looks
like the host command, that doesn't timeout and is the subject of this
bug here, crashed.

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Title:
  bind9-host, avahi-daemon-check-dns.sh hang forever causes network
  connections to get stuck

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[Bug 1752411] Re: bind9-host, avahi-daemon-check-dns.sh hang forever causes network connections to get stuck

[Andreas Hasenack]

** Tags removed: server-next

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Title:
  bind9-host, avahi-daemon-check-dns.sh hang forever causes network
  connections to get stuck

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[Bug 1752411] Re: bind9-host, avahi-daemon-check-dns.sh hang forever causes network connections to get stuck

[Andreas Hasenack]

It should probably also check for 127.0.0.53, not just 127.0.0.1

** Also affects: avahi (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=898038
   Importance: Unknown
   Status: Unknown

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Title:
  bind9-host, avahi-daemon-check-dns.sh hang forever causes network
  connections to get stuck

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[Bug 1752411] Re: bind9-host, avahi-daemon-check-dns.sh hang forever causes network connections to get stuck

[Andreas Hasenack]

I think that time is past, we were in beta freeze in the past week, and
are in final freeze now. Unless there is a clear test case showing under
which conditions this happens and how widespread it is, it's probably
best to start thinking in SRU terms.

It looks like a safe change, but since I don't understand the problem
entirely yet (when it happens, why), I can't say.

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Title:
  bind9-host, avahi-daemon-check-dns.sh hang forever causes network
  connections to get stuck

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[Bug 1752411] Re: bind9-host, avahi-daemon-check-dns.sh hang forever causes network connections to get stuck

[Andreas Hasenack]

Some troubleshooting I did with Trent today showed:

a) the "host -t soa local." call triggered a query to 127.0.0.53 as
expected, network-wise, which got a response right away

b) we snapshotted ip route and ip addr just before the host call, and
saw that the interface responsible for the default route (and route to
his dns server) was still down. I wonder if dns_reachable() in
/usr/lib/avahi/avahi-daemon-check-dns.sh is doing the right thing. It
looks for 127.0.0.1 (and not 127.0.0.53), and, failing that, for a
default route. The default route exists, but the link it goes through is
still down:

2: eno1:  mtu 1500 qdisc fq_codel
state DOWN group default qlen 1000

default via x.x.x.x dev eno1 onlink linkdown

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Title:
  bind9-host, avahi-daemon-check-dns.sh hang forever causes network
  connections to get stuck

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[Bug 1752411] Re: bind9-host, avahi-daemon-check-dns.sh hang forever causes network connections to get stuck

[Andreas Hasenack]

Can you try running "host" with -d in the scenario where it is hanging?

Also, a fresh bionic system shouldn't run the ifup-down scripts, since
it uses netplan. Unless openconnect or one of its dependencies pull it
in explicitly. A quick apt-cache rdepends didn't see it.

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Title:
  bind9-host, avahi-daemon-check-dns.sh hang forever causes network
  connections to get stuck

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