I don't have to do anything to reproduce it, just boot the machine and
it starts happening:
⏵ sudo strace -p 823
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=13, events=POLLIN}], 8, -1) =
1 ([{fd=4, revents=POLLIN}])
recvmsg(4, {msg_name={sa_family=AF_INET, sin_port=htons(33704),
sin_addr=inet_addr("127.0.0.1")}, msg_namelen=28 => 16,
msg_iov=[{iov_base="4\312\1\0\0\1\0\0\0\0\0\0\0014\19\18\0015\1c\1d\0017\0016\0016\1b"...,
iov_len=4096}], msg_iovlen=1, msg_control=[{cmsg_len=28,
cmsg_level=SOL_IP, cmsg_type=IP_PKTINFO,
cmsg_data={ipi_ifindex=if_nametoindex("lo"),
ipi_spec_dst=inet_addr("127.0.0.53"),
ipi_addr=inet_addr("127.0.0.53")}}], msg_controllen=32, msg_flags=0}, 0)
= 90
ioctl(4, SIOCGIFNAME, {ifr_ifindex=1, ifr_name="lo"}) = 0
sendto(13,
"4\312\1\0\0\1\0\0\0\0\0\0\0014\19\18\0015\1c\1d\0017\0016\0016\1b"...,
90, 0, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.53")}, 16) = 90
As mentioned, I think it happens when an address is denied by dnsmasq.
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Touch seeded packages, which is subscribed to dnsmasq in Ubuntu.
https://bugs.launchpad.net/bugs/1980146
Title:
dnsmasq often using 100% of CPU
Status in dnsmasq package in Ubuntu:
New
Bug description:
Release: 22.04
Codename: jammy
Kernel: Linux 5.15.0-40-generic x86_64
⏵ apt-cache policy dnsmasq
Installed: 2.86-1.1ubuntu0.1
dnsmasq is caught in a loop after every dns request, resulting in 100%
CPU usage for several minutes each time. This leads to a hot and
lethargic computer. During this time thousands of the following
messages (see below) are printed from strace.
The loop tends to obsess on denied connections, but there are so many
I'm not 100% sure.
systemd-resolved is _not_ running, some bugs refer to that.
⏵ head /etc/dnsmasq.d/foo.conf
address=/#/127.0.0.2
port=53
resolv-file=/var/run/NetworkManager/resolv.conf
⏵ sudo strace -p 3519 (dnsmasq)
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=13, events=POLLIN}, {fd=14,
events=POLLIN}], 9, -1) = 1 ([{fd=4, revents=POLLIN}])
recvmsg(4, {msg_name={sa_family=AF_INET, sin_port=htons(60224),
sin_addr=inet_addr("127.0.0.1")}, msg_namelen=28 => 16,
msg_iov=[{iov_base="\302\221\1\0\0\1\0\0\0\0\0\0\17classify-
client\10ser"..., iov_len=4096}], msg_iovlen=1,
msg_control=[{cmsg_len=28, cmsg_level=SOL_IP, cmsg_type=IP_PKTINFO,
cmsg_data={ipi_ifindex=if_nametoindex("lo"),
ipi_spec_dst=inet_addr("127.0.0.53"),
ipi_addr=inet_addr("127.0.0.53")}}], msg_controllen=32, msg_flags=0},
0) = 54
ioctl(4, SIOCGIFNAME, {ifr_ifindex=1, ifr_name="lo"}) = 0
sendto(14, "\302\221\1\0\0\1\0\0\0\0\0\0\17classify-client\10ser"...,
54, 0, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.53")}, 16) = 54
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