Hi mixmastamyk,
Would you be able to provide the following information:
* dpkg --get-selections | cut -f 1
* /etc/resolv.conf
* /etc/NetworkManager/NetworkManager.conf
* /etc/dnsmasq.conf
* /run/dnsmasq/resolv.conf
* /var/run/dhcpd.leases (or /run/dhcpd.leases?)
Do make sure you remove any sensitive information from those.
Also, when your system hits the 100% issue, could you provide the
following info:
* ps aux
- Is logrotate running? (Or some other 'heavy' process?)
* journalctl -f
- Any mention of "maximum number of concurrent dns queries reached"?
https://github.com/jedisct1/dnsblast provides a tool which could be used
to try to reproduce the issue.
@sefs:
Your issue may be unrelated to mixmastamyk's bug. Wouldyou be able to
file a separate bug providing the same information I just requested to
mixmastamyk above?
Thanks!
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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
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