Are you running dnsmasq in debug mode? Simon.
On 16/10/2021 15:17, Juhyung Park wrote: > Hi. > > I'm trying to debug an issue with dnsmasq that gets completely > unresponsive after a few days of uptime. > > We have dnsmasq setup to serve as a DHCP server to local, wired > network (192.168.10.0/24) and as a DNS resolver to local and WireGuard > VPN network (192.168.240.0/24). > > After the dnsmasq daemon runs for a few days, it gets completely > unresponsive. DHCP isn't renewed, DNS resolver doesn't work, etc. > > Using strace, I'm able to see that it's blocked from reading a socket: > # strace -f -p 342291 > strace: Process 342291 attached > read(13, ^Cstrace: Process 342291 detached > <detached ...> > > dnsmasq.conf: > bogus-priv > cache-size=5000 > domain-needed > no-negcache > no-resolv > no-poll > no-hosts > log-facility=/dev/kmsg > > # DHCP > dhcp-range=192.168.10.2,192.168.10.254,255.255.255.0 > dhcp-no-override > dhcp-authoritative > dhcp-lease-max=253 > dhcp-option=6,192.168.10.1 > > server=164.124.101.2 > > /proc/?/fd: > /proc/342291/fd# ll > total 0 > dr-x------ 2 root root 0 Oct 16 22:30 ./ > dr-xr-xr-x 9 root root 0 Oct 16 18:53 ../ > lr-x------ 1 root root 64 Oct 16 22:30 0 -> 'pipe:[3988]' > l-wx------ 1 root root 64 Oct 16 22:30 1 -> /dev/null > lr-x------ 1 root root 64 Oct 16 22:30 10 -> 'pipe:[526396]' > l-wx------ 1 root root 64 Oct 16 22:30 11 -> 'pipe:[526396]' > l-wx------ 1 root root 64 Oct 16 22:30 12 -> /dev/kmsg > lrwx------ 1 root root 64 Oct 16 22:30 13 -> 'socket:[2740642]' > l-wx------ 1 root root 64 Oct 16 22:30 2 -> /dev/null > lrwx------ 1 root root 64 Oct 16 22:30 3 -> /var/lib/misc/dnsmasq.leases > lrwx------ 1 root root 64 Oct 16 22:30 4 -> 'socket:[526385]' > lrwx------ 1 root root 64 Oct 16 22:30 5 -> 'socket:[526386]' > lrwx------ 1 root root 64 Oct 16 22:30 6 -> 'socket:[526388]' > lrwx------ 1 root root 64 Oct 16 22:30 7 -> 'socket:[526389]' > lrwx------ 1 root root 64 Oct 16 22:30 8 -> 'socket:[526390]' > lrwx------ 1 root root 64 Oct 16 22:30 9 -> 'socket:[526391]' > > lsof: > # lsof -i -a -p 342291 > COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME > dnsmasq 342291 root 4u IPv4 526385 0t0 UDP *:bootps > dnsmasq 342291 root 6u IPv4 526388 0t0 UDP *:domain > dnsmasq 342291 root 7u IPv4 526389 0t0 TCP *:domain (LISTEN) > dnsmasq 342291 root 8u IPv6 526390 0t0 UDP *:domain > dnsmasq 342291 root 9u IPv6 526391 0t0 TCP *:domain (LISTEN) > dnsmasq 342291 root 13u IPv4 2740642 0t0 TCP > 192.168.240.1:domain->192.168.240.103:63169 (ESTABLISHED) > > It seems that a WireGuard client DNS socket (fd 13) is forever > blocked. Since I'm not sure as to whether this is WireGuard's or > dnsmasq's issue, I figured I'd try contacting dnsmasq mailing list > first. > > dnsmasq is version 2.85, but we've tried older versions as well. > > Any suggestions? > > Thanks. > > _______________________________________________ > Dnsmasq-discuss mailing list > Dnsmasq-discuss@lists.thekelleys.org.uk > https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss > _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
