Even if the log spamming disappears, I don't think switching DNS servers ~100 times per second will be a reasonable use of scarce battery power...
I mean, loosing connectivity is a common situation when a laptop is used while commuting, in a train, a bus, cafe or station, in which case the batteries are a scarce resource. The least thing that could be expected about the underlying switching of servers is that there is some sort of exponential back-off, probably reset when routes to the servers change -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1698734 Title: systemd-resolved spams syslog whenever I'm disconnected Status in systemd package in Ubuntu: Fix Released Status in systemd source package in Xenial: New Status in systemd source package in Zesty: New Status in systemd source package in Artful: Fix Released Bug description: Every time I suspend my laptop and resume in a situation where I don't have connectivity I get big syslog spam from systemd-resolved. See for instance yesterday when I went out: Jun 18 18:48:16 chiron systemd[1]: Starting Suspend... Jun 18 18:48:16 chiron systemd-resolved[1868]: Switching to fallback DNS server 8.8.8.8. Jun 18 18:48:16 chiron systemd-resolved[1868]: Switching to fallback DNS server 8.8.4.4. Jun 18 18:48:16 chiron systemd-resolved[1868]: Switching to fallback DNS server 2001:4860:4860::8888. Jun 18 18:48:16 chiron systemd-resolved[1868]: Switching to fallback DNS server 2001:4860:4860::8844. ... And the last messages of the "episode": Jun 18 20:13:28 chiron systemd-resolved[1868]: Switching to fallback DNS server 8.8.8.8. Jun 18 20:13:28 chiron systemd-resolved[1868]: Switching to fallback DNS server 8.8.4.4. Jun 18 20:13:28 chiron systemd-resolved[1868]: Switching to fallback DNS server 2001:4860:4860::8888. Jun 18 20:13:28 chiron systemd-resolved[1868]: Switching to fallback DNS server 2001:4860:4860::8844. Jun 18 20:13:28 chiron systemd-resolved[1868]: Switching to fallback DNS server 8.8.8.8. Jun 18 20:13:28 chiron NetworkManager[30674]: <info> [1497809608.0889] device (wlp2s0): supplicant interface state: associ ated -> 4-way handshake So this correspond to roughly 85 minutes of disconnection, during which I got... $ grep "fallback DNS" /var/log/syslog.1 | wc -l 444066 This correspond to 5224 messages/minute, 87 messages/second I had a few other episodes in the last week, including a 4h train roundtrip: $ zgrep "fallback DNS" /var/log/syslog* | wc -l 1964217 I noticed the bug during the trip, when the SSD activity was slowing my machine in a clearly noticeable way. I'm running: $ lsb_release -rd Description: Ubuntu 17.04 Release: 17.04 $ apt-cache policy $(dpkg-query -S $(which systemd-resolve ) | awk '{print $1}') systemd: Installed: 232-21ubuntu3 Candidate: 232-21ubuntu3 Version table: *** 232-21ubuntu3 500 500 http://es.archive.ubuntu.com/ubuntu zesty-updates/main amd64 Packages 100 /var/lib/dpkg/status 232-21ubuntu2 500 500 http://es.archive.ubuntu.com/ubuntu zesty/main amd64 Packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1698734/+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
