OK, I've spent some time investigating this one, so I decided to post my progress here. Unfortunately I don't have a full fix yet, but I managed to find some interesting pointers related to systemd.
First of all, I confirmed what Christian and Andreas were seeing: the problem happens on every second "systemctl start dnsmasq.service"; squid takes 30 seconds to restart regardless of dnsmasq/resolvconf (this is still true nowadays, with groovy); nss-lookup.target fails to start on xenial, but does start on bionic; the issue doesn't seem to happen on bionic. As for the systemd bits I mentioned, I found these issues: - https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1417010 - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=777113 The good news is that they are really similar to what we're experiencing here, even though our problem doesn't seem to be cirular dependencies on systemd service files. The bad news is that the fix proposed by Martin Pitt (the last one, that ended up landing) is already available on xenial. One of the suggested fixes was to add a "--no-block" on /usr/sbin /invoke-rc.d's "systemctl reload" command. I did that, and it obviously "solves" the issue, although I'm not confident that it's the proper fix for this. Something that caught my attention is the fact that the process that is hung is actually the "systemctl reload squid", and not squid itself. I verified that "/etc/init.d/squid reload" actually exits successfully, but for some reason "systemctl reload squid" keeps waiting. With what I know so far, I feel inclined to say that this is a systemd issue, and not a dnsmasq/squid/resolvconf one (of course, we can talk about squid's 30-second restart, but that's orthogonal). I'll let you know when I have more data (or hopefully a fix). Meanwhile, I'd appreciate comments/feedback, if you have any. ** Bug watch added: Debian Bug tracker #777113 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=777113 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to dnsmasq in Ubuntu. https://bugs.launchpad.net/bugs/1761096 Title: dnsmasq starts with error on Ubuntu Xenial amd64 when squid installed Status in dnsmasq package in Ubuntu: Fix Released Status in squid package in Ubuntu: Fix Released Status in dnsmasq source package in Xenial: Confirmed Status in squid source package in Xenial: Confirmed Bug description: Setup to reproduce: Ubuntu Xenial amd64 net install iso from http://archive.ubuntu.com/ubuntu/dists/xenial/main/installer- amd64/current/images/netboot/mini.iso Install system with mostly defaults + LVM + OpenSSH server Note that this bug applies to both DHCP and static IP+DNS network configurations Once server rebooted and is available, log in and install dnsmasq + squid: apt-get update && apt-get install squid dnsmasq output of this can be found at https://pastebin.com/9Atuipju journalctl -xe output at https://pastebin.com/uLhfM4jN Furthermore at this point I can run alternating errors root@ubuntu-min:~# date ; service dnsmasq start ; date Wed Apr 4 09:18:07 CEST 2018 Wed Apr 4 09:18:07 CEST 2018 root@ubuntu-min:~# date ; service dnsmasq stop ; date Wed Apr 4 09:18:39 CEST 2018 Wed Apr 4 09:18:39 CEST 2018 root@ubuntu-min:~# date ; service dnsmasq start ; date Wed Apr 4 09:19:10 CEST 2018 Job for dnsmasq.service failed because a timeout was exceeded. See "systemctl status dnsmasq.service" and "journalctl -xe" for details. Wed Apr 4 09:20:40 CEST 2018 root@ubuntu-min:~# date ; service dnsmasq start ; date Wed Apr 4 09:42:57 CEST 2018 Wed Apr 4 09:42:57 CEST 2018 root@ubuntu-min:~# date ; service dnsmasq stop ; date Wed Apr 4 09:43:14 CEST 2018 Wed Apr 4 09:43:14 CEST 2018 root@ubuntu-min:~# date ; service dnsmasq start ; date Wed Apr 4 09:43:26 CEST 2018 Job for dnsmasq.service failed because a timeout was exceeded. See "systemctl status dnsmasq.service" and "journalctl -xe" for details. Wed Apr 4 09:44:56 CEST 2018 and so on... Each and every 1 out of 2 stop/start cycle fails in 1m30s timeout Complete journalctl -xe output attached To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1761096/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
