I have been monitoring the same issue for months. But have not been able to identify the root cause. Worst yet it not only affects my system but also my router.
The dnsmasq goes to 100%cpu and somehow forces my pfsense to also begin to consume 100%cpu if i kill dnsmasq then the router comes back to normal. Please send help. -- 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/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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1980146/+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
