@ Michael Roth (mdroth) On zesty and later /etc/resolv.conf must not list "nameserver 127.0.0.1" this seems to be broken configuration state. I am concerned how you got into such a state. Is your network managed by ifupdown with /etc/network/interfaces or NetworkManager? do you have resolvconf installed? What is the output of $ NetworkManager --print-config | grep dns ?
@tomposmiko $ systemctl disable systemd-resolved $ systemctl stop systemd-resolved $ systemctl mask systemd-resolved $ apt remove --purge libnss-resolve Should do it. Then you should still have resolvconf & ifupdown installed, or resolvconf+dnsmasq+NetworkManager installed. Or without resolvconf manage /etc/resolv.conf by hand. Note such system configurations may not be fully supported, but should be operational for simplistic networking setups. -- 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/1670959 Title: systemd-resolved using 100% CPU Status in dnsmasq package in Ubuntu: Confirmed 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1670959/+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
