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[ Christian Ehrhardt  <1761096@xxxxxxxxxxxxxxxxxx>]

I confirm that every second 
 $ systemctl restart dnsmasq
hangs

Also I confirm that removing squid resolved the situation.

I found that it does this:
1. /bin/sh /etc/init.d/dnsmasq systemd-stop-resolvconf
2. /bin/sh /etc/init.d/dnsmasq systemd-start-resolvconf

Both will call hooks like:

0     0 11642 11634  20   0   4364   660 wait   S    ?          0:00  \_ run-parts --arg=-a --arg=lo.dnsmasq /etc/resolvconf/update.d
0     0 11659 11642  20   0   4364   664 wait   S    ?          0:00      \_ run-parts /etc/resolvconf/update-libc.d
0     0 11672 11659  20   0   4504   704 wait   S    ?          0:00          \_ /bin/sh /etc/resolvconf/update-libc.d/squid
0     0 11673 11672  20   0   4504  1648 wait   S    ?          0:00              \_ /bin/sh /usr/sbin/invoke-rc.d squid reload
4     0 11691 11673  20   0  24888  1388 poll_s S    ?          0:00                  \_ systemctl reload squid.service


This is what actually times out - the squid hook.

The "systemctl reload squid.service" call seems to take too long every
second time?!

A single "systemctl reload squid.service" for these seems to take ~100 seconds for me.
OTOH a direct call to it is fast every time.

This needs to be debugged in detail, but seems well reproducible.


** Also affects: dnsmasq (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: dnsmasq (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: dnsmasq (Ubuntu)
       Status: New => Fix Released

** Changed in: dnsmasq (Ubuntu Xenial)
   Importance: Undecided => High

** Tags added: server-next

** Also affects: squid (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: squid (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: squid (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: squid (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1761096

Title:
  dnsmasq starts with error on Ubuntu Xenial amd64 when squid installed

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