[Bug 1688364] Re: Non existent host causes 100% cpu utilization by systemd-resolved and dnsmasq

Fodder 1688364 at bugs.launchpad.net
Mon May 8 12:31:42 UTC 2017 

###### Start of debugging information for resolvconf ######
### ls -l /etc/resolvconf
total 16
-rw-r--r-- 1 root root  511 May  4  2015 interface-order
drwxr-xr-x 2 root root 4096 Apr 21 10:52 resolv.conf.d
drwxr-xr-x 2 root root 4096 Apr 21 10:11 update.d
drwxr-xr-x 2 root root 4096 Apr 14 10:59 update-libc.d
### cat /etc/resolvconf/interface-order
# interface-order(5)
lo.inet6
lo.inet
lo.@(dnsmasq|pdnsd)
lo.!(pdns|pdns-recursor)
lo
tun*
tap*
hso*
em+([0-9])?(_+([0-9]))*
p+([0-9])p+([0-9])?(_+([0-9]))*
@(br|eth)*([^.]).inet6
@(br|eth)*([^.]).ip6.@(dhclient|dhcpcd|pump|udhcpc)
@(br|eth)*([^.]).inet
@(br|eth)*([^.]).@(dhclient|dhcpcd|pump|udhcpc)
@(br|eth)*
@(ath|wifi|wlan)*([^.]).inet6
@(ath|wifi|wlan)*([^.]).ip6.@(dhclient|dhcpcd|pump|udhcpc)
@(ath|wifi|wlan)*([^.]).inet
@(ath|wifi|wlan)*([^.]).@(dhclient|dhcpcd|pump|udhcpc)
@(ath|wifi|wlan)*
ppp*
*
### ls -l /etc/resolvconf/resolv.conf.d
total 4
-rw-r--r-- 1 root root   0 Oct 10  2014 base
-rw-r--r-- 1 root root 282 Nov 28 18:37 head
### cat /etc/resolvconf/resolv.conf.d/base
### cat /etc/resolvconf/resolv.conf.d/head
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.

### ls -l /run/resolvconf
### ls -l /run/resolvconf
total 4
-rw-r--r-- 1 root root   0 May  8 04:17 enable-updates
drwxr-xr-x 2 root root  80 May  8 05:32 interface
-rw-r--r-- 1 root root 303 May  8 05:32 resolv.conf
### cat /run/resolvconf/enable-updates
### cat /run/resolvconf/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.

nameserver 127.0.0.1
### ls -l /run/resolvconf/interface
total 8
-rw-r--r-- 1 root root 21 May  8 05:32 lo.dnsmasq
-rw-r--r-- 1 root root 22 May  8 04:17 systemd-resolved
### cat /run/resolvconf/interface/lo.dnsmasq
nameserver 127.0.0.1
### cat /run/resolvconf/interface/systemd-resolved
nameserver 127.0.0.53
### ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 29 Jun 11  2015 /etc/resolv.conf -> ../run/resolvconf/resolv.conf
### lsattr /etc/resolv.conf
lsattr: Operation not supported While reading flags on /etc/resolv.conf
### cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.

nameserver 127.0.0.1
### cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false
###### End of debugging information for resolvconf ######

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https://bugs.launchpad.net/bugs/1688364

Title:
  Non existent host causes 100% cpu utilization by systemd-resolved and
  dnsmasq

Status in dnsmasq package in Ubuntu:
  Incomplete
Status in resolvconf package in Ubuntu:
  New

Bug description:
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] googletagservices.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded googletagservices.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] googletagservices.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded googletagservices.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] googletagservices.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded googletagservices.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] googletagservices.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded googletagservices.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] googletagservices.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded googletagservices.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] googletagservices.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded googletagservices.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] googletagservices.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded googletagservices.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: forwarded cf.shareasimage.com to 127.0.0.53
  May 04 13:32:07 cannon-fodder dnsmasq[8101]: query[A] cf.shareasimage.com from 127.0.0.1

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