Public bug reported:
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
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1698734
Title:
systemd-resolved spams syslog whenever I'm disconnected
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