Thanks for the information you provided. I set up a Ubuntu Jammy VM with
ssh and dnsmasq running and unfortunately I cannot reproduce it just
with that. There might be something else happening in your system.
If you could provide information about all processes running in your
system when this happens it would be great. It could at least serve as a
lead for us to keep investigating this issue, right now I am not sure
what's going on.
** Changed in: dnsmasq (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1980146
Title:
dnsmasq often using 100% of CPU
Status in dnsmasq package in Ubuntu:
Incomplete
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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