1. top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
19147 systemd+ 20 0 50848 6232 4572 R 99.0 0.1 5:43.81
systemd-resolve
1472 dnsmasq 20 0 57020 3084 2620 R 63.1 0.0 44:03.49 dnsmasq
2. journalctl -u systemd-resolved.service
Apr 16 13:01:59 Danny systemd-resolved[19147]: DNSSEC validation failed for
question clients-china.l.google.com IN A: failed-auxiliary
Apr 16 13:02:02 Danny systemd-resolved[19147]: Using degraded feature set
(UDP+EDNS0) for DNS server 127.0.0.1.
Apr 16 13:02:08 Danny systemd-resolved[19147]: Server 127.0.0.1 does not
support DNSSEC, downgrading to non-DNSSEC mode.
Apr 16 13:06:24 Danny systemd-resolved[19147]: Server 192.168.128.1 does not
support DNSSEC, downgrading to non-DNSSEC mode.
Apr 16 13:11:24 Danny systemd-resolved[19147]: Grace period over, resuming full
feature set (UDP+EDNS0+DO+LARGE) for DNS server 127.0.0.1.
3. journalctl -u dnsmasq.service
Apr 16 13:18:27 Danny dnsmasq[1472]: Maximum number of concurrent DNS queries
reached (max: 150)
Apr 16 13:18:33 Danny dnsmasq[1472]: Maximum number of concurrent DNS queries
reached (max: 150)
Apr 16 13:18:39 Danny dnsmasq[1472]: Maximum number of concurrent DNS queries
reached (max: 150)
Apr 16 13:18:45 Danny dnsmasq[1472]: Maximum number of concurrent DNS queries
reached (max: 150)
Apr 16 13:18:51 Danny dnsmasq[1472]: Maximum number of concurrent DNS queries
reached (max: 150)
4. lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 17.04
Release: 17.04
Codename: zesty
5. sudo strace -p 1472 --- dnsmasq
bind(12, {sa_family=AF_INET, sin_port=htons(37051),
sin_addr=inet_addr("0.0.0.0")}, 16) = 0
sendto(12, "g\325\1\20\0\1\0\0\0\0\0\1\rclients-china\1l\6goo"..., 55, 0,
{sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.53")}, 16)
= 55
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=5, events=POLLIN},
{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9,
events=POLLIN}, {fd=12, events=POLLIN}], 8, -1) = 2 ([{fd=4, revents=POLLIN},
{fd=12, revents=POLLIN}])
recvfrom(12, "g\325\201\200\0\1\0\6\0\0\0\1\rclients-china\1l\6goo"..., 5131,
0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.53")},
[16]) = 151
sendmsg(4, {msg_name(16)={sa_family=AF_INET, sin_port=htons(33355),
sin_addr=inet_addr("127.0.0.1")},
msg_iov(1)=[{"\272\303\201\220\0\1\0\6\0\0\0\1\rclients-china\1l\6goo"...,
151}], msg_controllen=0, msg_flags=0}, 0) = 151
close(12) = 0
recvmsg(4, {msg_name(16)={sa_family=AF_INET, sin_port=htons(57326),
sin_addr=inet_addr("127.0.0.1")},
msg_iov(1)=[{"C\21\1\20\0\1\0\0\0\0\0\1\rclients-china\1l\6goo"..., 4096}],
msg_controllen=0, msg_flags=0}, 0) = 55
socket(AF_INET, SOCK_DGRAM, IPPROTO_IP) = 12
fcntl(12, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(12, F_SETFL, O_RDWR|O_NONBLOCK) = 0
6. sudo strace -p 1914
clock_gettime(CLOCK_BOOTTIME, {5858, 172230641}) = 0
open("/run/systemd/netif/links/2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such
file or directory)
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=303, ...}) = 0
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=303, ...}) = 0
socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 18
connect(18, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.1")}, 16) = 0
epoll_ctl(4, EPOLL_CTL_ADD, 18, {EPOLLIN, {u32=1040890848,
u64=94559040879584}}) = 0
write(18, ";q\1\20\0\1\0\0\0\0\0\1\17ec2-52-7-217-10\tcom"..., 68) = 68
clock_gettime(CLOCK_BOOTTIME, {5858, 172456596}) = 0
clock_gettime(CLOCK_BOOTTIME, {5858, 172482649}) = 0
epoll_ctl(4, EPOLL_CTL_DEL, 18, NULL) = 0
close(18) = 0
sendmsg(15, {msg_name(16)={sa_family=AF_INET, sin_port=htons(45041),
sin_addr=inet_addr("127.0.0.1")},
msg_iov(1)=[{"qX\201\200\0\1\0\1\0\0\0\1\17ec2-52-7-217-10\tcom"..., 84}],
msg_controllen=28, [{cmsg_len=28, cmsg_level=SOL_IP, cmsg_type=IP_PKTINFO,
{ipi_ifindex=if_nametoindex("lo"), ipi_spec_dst=inet_addr("127.0.0.53"),
ipi_addr=inet_addr("127.0.0.53")}}], msg_flags=0}, 0) = 84
epoll_wait(4, [{EPOLLIN, {u32=1039855040, u64=94559039843776}}], 16, -1) = 1
clock_gettime(CLOCK_BOOTTIME, {5858, 172675790}) = 0
recvfrom(15, NULL, 0, MSG_PEEK|MSG_TRUNC, NULL, NULL) = 68
recvmsg(15, {msg_name(16)={sa_family=AF_INET, sin_port=htons(48677),
sin_addr=inet_addr("127.0.0.1")},
msg_iov(1)=[{"\313{\1\20\0\1\0\0\0\0\0\1\17ec2-52-7-217-10\tcom"..., 3936}],
msg_controllen=56, [{cmsg_len=28, cmsg_level=SOL_IP, cmsg_type=IP_PKTINFO,
{ipi_ifindex=if_nametoindex("lo"), ipi_spec_dst=inet_addr("127.0.0.53"),
ipi_addr=inet_addr("127.0.0.53")}}, {cmsg_len=20, cmsg_level=SOL_IP,
cmsg_type=IP_TTL, {ttl=64}}], msg_flags=0}, 0) = 68
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=303, ...}) = 0
getrandom("\213\235", 2, GRND_NONBLOCK) = 2
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=303, ...}) = 0
getrandom(" \317", 2, GRND_NONBLOCK) = 2
7. systemd-resolve --status
Global
DNS Servers: 127.0.0.1
DNSSEC NTA: 10.in-addr.arpa
16.172.in-addr.arpa
168.192.in-addr.arpa
17.172.in-addr.arpa
18.172.in-addr.arpa
19.172.in-addr.arpa
20.172.in-addr.arpa
21.172.in-addr.arpa
22.172.in-addr.arpa
23.172.in-addr.arpa
24.172.in-addr.arpa
25.172.in-addr.arpa
26.172.in-addr.arpa
27.172.in-addr.arpa
28.172.in-addr.arpa
29.172.in-addr.arpa
30.172.in-addr.arpa
31.172.in-addr.arpa
corp
d.f.ip6.arpa
home
internal
intranet
lan
local
private
test
Link 2 (wlan0)
Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: allow-downgrade
DNSSEC supported: no
DNS Servers: 192.168.128.1
DNS Domain: lan
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https://bugs.launchpad.net/bugs/1670959
Title:
systemd-resolved using 100% CPU
Status in systemd package in Ubuntu:
Confirmed
Bug description:
Sometimes systemd-resolved process is using 100% CPU.
After a while it changes back to normal.
It happens usually after connecting to the (wifi) network, like
starting the OS.
strace output:
sendmsg(12, {msg_name(16)={sa_family=AF_INET, sin_port=htons(33589),
sin_addr=inet_addr("127.0.0.1")},
msg_iov(1)=[{"6\215\201\200\0\1\0\1\0\0\0\1\4cs41\3wac\vedgecastcdn\3net\0\0\34\0\1\300\f\0\34\0\1\0\0\10\235\0\20&\6(\0\0024\0Y%L\4\6#f&\214\0\0)\377\326\0\0\0\0\0\0",
81}], msg_controllen=28, [{cmsg_len=28, cmsg_level=SOL_IP,
cmsg_type=IP_PKTINFO, {ipi_ifindex=if_nametoindex("lo"),
ipi_spec_dst=inet_addr("127.0.0.53"), ipi_addr=inet_addr("127.0.0.53")}}],
msg_flags=0}, 0) = 81
sendmsg(3, {msg_name(0)=NULL,
msg_iov(4)=[{"PRIORITY=6\nSYSLOG_FACILITY=3\nCODE_FILE=../src/resolve/resolved-dns-stub.c\nCODE_LINE=363\nCODE_FUNCTION=dns_stub_process_query\nSYSLOG_IDENTIFIER=systemd-resolved\n",
160}, {"MESSAGE=", 8}, {"Processing query...", 19}, {"\n", 1}],
msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 188
epoll_wait(4, [{EPOLLIN, {u32=3176459184, u64=94565471415216}}], 16, -1) = 1
clock_gettime(CLOCK_BOOTTIME, {44665, 938069872}) = 0
recvfrom(12, NULL, 0, MSG_PEEK|MSG_TRUNC, NULL, NULL) = 53
recvmsg(12, {msg_name(16)={sa_family=AF_INET, sin_port=htons(33589),
sin_addr=inet_addr("127.0.0.1")},
msg_iov(1)=[{"Z\262\1\20\0\1\0\0\0\0\0\1\4cs41\3wac\vedgecastcdn\3net\0\0\34\0\1\0\0)\2\0\0\0\0\0\0\0",
3936}], msg_controllen=56, [{cmsg_len=28, cmsg_level=SOL_IP,
cmsg_type=IP_PKTINFO, {ipi_ifindex=if_nametoindex("lo"),
ipi_spec_dst=inet_addr("127.0.0.53"), ipi_addr=inet_addr("127.0.0.53")}},
{cmsg_len=20, cmsg_level=SOL_IP, cmsg_type=IP_TTL, {ttl=64}}], msg_flags=0}, 0)
= 53
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=303, ...}) = 0
getrandom("\365I", 2, GRND_NONBLOCK) = 2
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=303, ...}) = 0
getrandom("\203;", 2, GRND_NONBLOCK) = 2
clock_gettime(CLOCK_BOOTTIME, {44665, 938446937}) = 0
open("/run/systemd/netif/links/3", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such
file or directory)
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=303, ...}) = 0
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=303, ...}) = 0
socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 18
connect(18, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.1")}, 16) = 0
epoll_ctl(4, EPOLL_CTL_ADD, 18, {EPOLLIN, {u32=3176610576,
u64=94565471566608}}) = 0
write(18,
"\203;\1\20\0\1\0\0\0\0\0\1\4cs41\3wac\vedgecastcdn\3net\0\0\34\0\1\0\0)\2\0\0\0\0\0\0\0",
53) = 53
clock_gettime(CLOCK_BOOTTIME, {44665, 938833717}) = 0
clock_gettime(CLOCK_BOOTTIME, {44665, 938875138}) = 0
epoll_ctl(4, EPOLL_CTL_DEL, 18, NULL) = 0
close(18) = 0
journalctl output:
Mar 08 08:25:35 parsec systemd-resolved[1512]: Processing query...
Mar 08 08:25:35 parsec systemd-resolved[1512]: Processing query...
Mar 08 08:25:35 parsec systemd-resolved[1512]: Processing query...
Mar 08 08:25:35 parsec systemd-resolved[1512]: Processing query...
Mar 08 08:25:35 parsec systemd-resolved[1512]: Processing query...
Mar 08 08:25:35 parsec systemd-resolved[1512]: Processing query...
Mar 08 08:25:35 parsec systemd-resolved[1512]: Processing query...
Mar 08 08:25:35 parsec systemd-resolved[1512]: Processing query...
Mar 08 08:25:41 parsec dnsmasq[1545]: Maximum number of concurrent DNS
queries reached (max: 150)
As you can see, I would use it together with dnsmasq.
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: systemd 232-18ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-9.11-generic 4.10.0
Uname: Linux 4.10.0-9-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
Date: Wed Mar 8 08:20:18 2017
MachineType: Hewlett-Packard HP EliteBook Folio 1020 G1
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/zsh
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.10.0-9-generic
root=UUID=a54fe703-35d4-47ac-9c6e-4034421531fb ro rootflags=subvol=@
SourcePackage: systemd
UpgradeStatus: Upgraded to zesty on 2015-05-24 (653 days ago)
dmi.bios.date: 03/09/2015
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: M77 Ver. 01.05
dmi.board.name: 2271
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 91.4C
dmi.chassis.asset.tag: CNU51199KV
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvrM77Ver.01.05:bd03/09/2015:svnHewlett-Packard:pnHPEliteBookFolio1020G1:pvrA3009DD18303:rvnHewlett-Packard:rn2271:rvrKBCVersion91.4C:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook Folio 1020 G1
dmi.product.version: A3009DD18303
dmi.sys.vendor: Hewlett-Packard
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