[Bug 1957086] Re: Autopkgtest systemd fail against dnsmasq 2.86 (22.04)

[Christian Ehrhardt ]

# FYI cleanup

# Minimal Reset (e.g. when switching dnsmasq)

killall dnsmasq
rm /tmp/dnsmasq*
dnsmasq --no-daemon --log-queries --log-facility=/tmp/dnsmasq.log --conf-file=/dev/null --dhcp-leasefile=/tmp/dnsmasq.leases --bind-interfaces --interface=router_eth42 --except-interface=lo --dhcp-range=192.168.5.10,192.168.5.200 --address=/#/192.168.42.1 &
dnsmasq --no-daemon --log-queries --log-facility=/tmp/dnsmasq-vpn.log --conf-file=/dev/null --dhcp-leasefile=/dev/null --bind-interfaces --interface=testvpnrouter --except-interface=lo --address=/math.lab/10.241.3.3 --address=/cantina.company/10.241.4.4 &
dig @10.241.3.1 -t AAAA math.lab


^^ With this I could confirm that switchign the good case to dnsmasq 2.86 makes
it enter the forwarding loop. Vice versa switching the bad system to dnsmasq
2.85 makes it work (not entering the loop).

# Full cleanup
sudo killall dnsmasq
sudo rm /run/systemd/network/general.network
sudo rm /run/systemd/network/vpn.network
sudo rm /run/systemd/resolved.conf.d/test-enable-dnssec.conf
for i in testvpnrouter testvpnclient test_eth42 router_eth42; do sudo ip link dev $i down; done
for i in testvpnrouter testvpnclient test_eth42 router_eth42; do sudo ip link del dev $i down; done
sudo systemctl restart systemd-resolved
sudo systemctl restart systemd-networkd

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https://bugs.launchpad.net/bugs/1957086

Title:
  Autopkgtest systemd fail against dnsmasq 2.86 (22.04)

Status in dnsmasq package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Full log (same on all architectures):
  https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/arm64/s/systemd/20220106_214401_24d29@/log.gz

  The test is from systemd:
  https://github.com/systemd/systemd/blob/main/test/networkd-test.py#L619

  Tail of the log:
  ```
  ERROR: test_resolved_domain_restricted_dns (__main__.DnsmasqClientTest)
  resolved: domain-restricted DNS servers
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/autopkgtest.NdIvJq/build.fBQ/src/test/networkd-test.py", line 678, in test_resolved_domain_restricted_dns
      out = subprocess.check_output(['resolvectl', 'query', 'math.lab'])
    File "/usr/lib/python3.9/subprocess.py", line 424, in check_output
      return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
    File "/usr/lib/python3.9/subprocess.py", line 528, in run
      raise CalledProcessError(retcode, process.args,
  subprocess.CalledProcessError: Command '['resolvectl', 'query', 'math.lab']' returned non-zero exit status 1.
  ```

  
  Tagging update-excuse to be shown in excuses

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