[Dnsmasq-discuss] dnsmasq 2.86 seems to stop reading from one of its dns sockets after a period of time under load
Tom Keddie
tomk+dnsmasq at minim.com
Wed Apr 20 14:38:52 UTC 2022
Hi All,
We've been trying to track down some connectivity issues on unreleased
firmware for some of the openwrt based routers we sell and have narrowed it
to a dns issue.
We're seeing dnsmasq 2.86 stop reading from one of its sockets after a
variable period of time with many (~45) clients. We also saw this problem
with dnsmasq 2.85 but on the single socket it opens.
Upstream dns still works as does resolution on 127.0.0.1 but resolution on
the bridged lan interface, 192.168.1.1, is backed up and not responding.
We do see some topology change events on the bridge but the interface has
been up since first boot and still responds to ping.
Any suggestions are welcome. I did go through the pending commits for 2.87
but didn't see anything relevant. I've included everything that I think
might be useful here, apologies for the length of the email.
Thanks,
Tom Keddie
root:~# netstat -anu
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
udp 0 0 127.0.0.1:50032 0.0.0.0:*
udp 0 0 127.0.0.1:38000 0.0.0.0:*
udp 0 0 127.0.0.1:48000 0.0.0.0:*
udp 0 0 127.0.0.1:37000 0.0.0.0:*
udp 0 0 127.0.0.1:58000 0.0.0.0:*
udp 0 0 0.0.0.0:51376 0.0.0.0:*
udp 0 0 127.0.0.1:58032 0.0.0.0:*
udp 0 0 127.0.0.1:46000 0.0.0.0:*
udp 0 0 127.0.0.1:45000 0.0.0.0:*
udp 0 0 127.0.0.1:44000 0.0.0.0:*
udp 0 0 127.0.0.1:45032 0.0.0.0:*
udp 0 0 127.0.0.1:43000 0.0.0.0:*
udp 0 0 127.0.0.1:44032 0.0.0.0:*
udp 0 0 127.0.0.1:42000 0.0.0.0:*
udp 0 0 127.0.0.1:52000 0.0.0.0:*
udp 0 0 127.0.0.1:42032 0.0.0.0:*
udp 0 0 71.192.91.235:53 0.0.0.0:*
udp 0 0 127.0.0.1:53 0.0.0.0:*
udp 183552 213248 192.168.1.1:53 0.0.0.0:*
udp 0 0 127.0.0.1:51000 0.0.0.0:*
udp 0 0 127.0.0.1:52032 0.0.0.0:*
udp 0 0 0.0.0.0:67 0.0.0.0:*
udp 0 0 127.0.0.1:50000 0.0.0.0:*
root:~# nslookup minim.co 75.75.75.75
Server: 75.75.75.75
Address: 75.75.75.75:53
Non-authoritative answer:
Name: minim.co
Address: 18.215.222.49
Non-authoritative answer:
root:~# nslookup minim.co 75.75.76.76
Server: 75.75.76.76
Address: 75.75.76.76:53
Non-authoritative answer:
Non-authoritative answer:
Name: minim.co
Address: 18.215.222.49
root:~# nslookup minim.co 127.0.0.1
Server: 127.0.0.1
Address: 127.0.0.1:53
Non-authoritative answer:
Name: minim.co
Address: 18.215.222.49
Non-authoritative answer:
root:~# nslookup minim.co 192.168.1.1
;; connection timed out; no servers could be reached
root:~# ps w | grep dns
6268 dnsmasq 2260 S /usr/sbin/dnsmasq -C
/var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
root:~# cat /var/etc/dnsmasq.conf.cfg01411c
# auto-generated config file from /etc/config/dhcp
conf-file=/etc/dnsmasq.conf
dhcp-authoritative
domain-needed
localise-queries
read-ethers
enable-ubus=dnsmasq
expand-hosts
bind-dynamic
local-service
edns-packet-max=1232
domain=lan
local=/lan/
addn-hosts=/tmp/hosts
dhcp-leasefile=/tmp/dhcp.leases
resolv-file=/tmp/resolv.conf.d/resolv.conf.auto
stop-dns-rebind
rebind-localhost-ok
dhcp-broadcast=tag:needs-broadcast
conf-dir=/tmp/dnsmasq.d
user=dnsmasq
group=dnsmasq
dhcp-host=00:0a:cd:32:6e:e9,192.168.1.193,Multisensor-Database
dhcp-ignore-names=tag:dhcp_bogus_hostname
conf-file=/usr/share/dnsmasq/dhcpbogushostname.conf
bogus-priv
conf-file=/usr/share/dnsmasq/rfc6761.conf
dhcp-range=set:lan,192.168.1.10,192.168.1.254,255.255.255.0,24h
root:~# cat /tmp/resolv.conf.d/resolv.conf.auto
# Interface wan
nameserver 75.75.75.75
nameserver 75.75.76.76
search hsd1.ma.comcast.net.
root:~# cat /tmp/dhcp.leases
1650547228 16:27:11:bd:95:42 192.168.1.208 OnePlus-Nord-N200-5G
01:16:27:11:bd:95:42
1650510491 48:98:ca:9b:e3:cc 192.168.1.157 KNOK 01:48:98:ca:9b:e3:cc
1650541991 12:0d:6e:11:0e:f1 192.168.1.222 Dennis-s-S21-Ultra
01:12:0d:6e:11:0e:f1
1650535710 72:20:71:2f:c8:2f 192.168.1.123 * 01:72:20:71:2f:c8:2f
1650533880 26:26:22:df:cb:e3 192.168.1.236 Galaxy-S10 01:26:26:22:df:cb:e3
1650535136 00:0a:cd:32:6e:e9 192.168.1.193 Multisensor-Database
01:00:0a:cd:32:6e:e9
1650491917 80:c1:6e:f3:f7:4c 192.168.1.182 * 01:80:c1:6e:f3:f7:4c
1650534737 a4:83:e7:5a:49:33 192.168.1.99 ZoomDev 01:a4:83:e7:5a:49:33
1650534463 6c:94:f8:a1:b4:fb 192.168.1.174 Denniss-iPad 01:6c:94:f8:a1:b4:fb
1650548813 0c:cb:85:f7:e5:81 192.168.1.62 MH7601 *
1650490643 0c:cb:85:f7:e5:80 192.168.1.61 * *
1650548775 0c:cb:85:f7:e5:7d 192.168.1.58 * *
1650537688 08:5b:d6:81:99:99 192.168.1.155 DESKTOP-QPFCJMS
01:08:5b:d6:81:99:99
1650546045 0a:35:2a:f3:bb:6a 192.168.1.161 Pixel-3-XL 01:0a:35:2a:f3:bb:6a
1650534279 48:98:ca:2a:5c:d0 192.168.1.206 CORI 01:48:98:ca:2a:5c:d0
1650532675 4c:66:41:63:a3:ce 192.168.1.212 Galaxy-S7 01:4c:66:41:63:a3:ce
1650532683 00:b5:d0:fc:cd:b5 192.168.1.16 Galaxy-Tab-A-2016
01:00:b5:d0:fc:cd:b5
1650544456 00:51:ed:3b:53:b2 192.168.1.243 LGwebOSTV 01:00:51:ed:3b:53:b2
1650547147 40:06:a0:a7:dc:a4 192.168.1.41 4006A0A7DCA4-mysimplelink *
1650545297 34:20:03:ed:e2:e3 192.168.1.190 * *
1650546997 5c:f3:70:26:7b:3f 192.168.1.30 DESKTOP-R3VI2U2
01:5c:f3:70:26:7b:3f
1650490270 0c:cb:85:f7:e5:7c 192.168.1.57 * *
1650546786 34:97:f6:b6:9b:01 192.168.1.127 DESKTOP-MVQ4Q7J
01:34:97:f6:b6:9b:01
1650548017 5c:f3:70:26:7b:67 192.168.1.70 DESKTOP-59AGI93
01:5c:f3:70:26:7b:67
1650546628 28:b2:bd:1a:03:06 192.168.1.186 kaplan-laptop
01:28:b2:bd:1a:03:06
1650545301 34:20:03:ed:d1:40 192.168.1.84 * *
1650546024 38:f9:d3:5e:02:e1 192.168.1.165 * 01:38:f9:d3:5e:02:e1
1650546052 8c:85:90:4f:35:12 192.168.1.185 DVTs-MBP 01:8c:85:90:4f:35:12
1650545303 34:20:03:ed:f1:6f 192.168.1.139 * *
1650547347 60:dd:8e:d3:d1:6e 192.168.1.211 DVT-Test 01:60:dd:8e:d3:d1:6e
1650545313 34:20:03:ed:d4:f1 192.168.1.78 * *
1650545301 34:20:03:ed:ea:22 192.168.1.244 * *
1650533137 48:43:dd:6b:86:50 192.168.1.221 * *
1650533886 dc:f5:05:13:2f:51 192.168.1.184 P12100384 01:dc:f5:05:13:2f:51
1650545293 34:20:03:ed:8d:7a 192.168.1.125 * *
1650533065 b0:fc:0d:7a:80:b2 192.168.1.67 amazon-533fd135f
01:b0:fc:0d:7a:80:b2
1650533016 d0:c5:d3:65:17:47 192.168.1.60 C72926881 01:d0:c5:d3:65:17:47
1650510564 b4:e6:2d:03:b5:32 192.168.1.130 Etekcity-Outlet *
1650546031 d4:25:8b:94:c3:de 192.168.1.251 * 01:d4:25:8b:94:c3:de
1650545211 48:98:ca:f9:3a:d2 192.168.1.252 C58804806 01:48:98:ca:f9:3a:d2
1650546123 b8:31:b5:ba:64:c9 192.168.1.18 XBOXONE 01:b8:31:b5:ba:64:c9
1650534777 48:98:ca:f4:c2:bf 192.168.1.232 C58213759 01:48:98:ca:f4:c2:bf
1650533023 bc:d7:d4:32:0f:ea 192.168.1.89 RokuUltra *
1650541196 60:f8:1d:ab:eb:40 192.168.1.249 build-001 01:60:f8:1d:ab:eb:40
1650550011 3c:06:30:3b:74:04 192.168.1.54 MacBook-Pro 01:3c:06:30:3b:74:04
root:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop qlen 1000
link/ether 22:ca:00:55:d9:ee brd ff:ff:ff:ff:ff:ff
3: ifb0: <BROADCAST,NOARP> mtu 1500 qdisc noop qlen 32
link/ether ba:84:9c:1e:ec:ac brd ff:ff:ff:ff:ff:ff
4: ifb1: <BROADCAST,NOARP> mtu 1500 qdisc noop qlen 32
link/ether 8e:9e:7d:ee:3a:6c brd ff:ff:ff:ff:ff:ff
5: gre0 at NONE: <NOARP> mtu 1476 qdisc noop qlen 1000
link/gre 0.0.0.0 brd 0.0.0.0
6: gretap0 at NONE: <BROADCAST,MULTICAST> mtu 1476 qdisc noop qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
7: erspan0 at NONE: <BROADCAST,MULTICAST> mtu 1464 qdisc noop qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
8: sit0 at NONE: <NOARP> mtu 1480 qdisc noop qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
9: ip6gre0 at NONE: <NOARP> mtu 1448 qdisc noop qlen 1000
link/[823] 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00 brd
00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
10: archer: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
11: bcmsw: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 0c:cb:85:f7:e5:a8 brd ff:ff:ff:ff:ff:ff
12: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen
1000
link/ether 0c:cb:85:f7:e5:a9 brd ff:ff:ff:ff:ff:ff
inet 71.192.91.235/22 brd 71.192.91.255 scope global eth0
valid_lft forever preferred_lft forever
13: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master br-lan qlen 1000
link/ether 0c:cb:85:f7:e5:a8 brd ff:ff:ff:ff:ff:ff
14: wl0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master
br-lan qlen 1000
link/ether 0c:cb:85:f7:e5:ab brd ff:ff:ff:ff:ff:ff
15: wl1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master
br-lan qlen 1000
link/ether 0c:cb:85:f7:e5:aa brd ff:ff:ff:ff:ff:ff
18: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue qlen
1000
link/ether 0c:cb:85:f7:e5:a8 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.1/24 brd 192.168.1.255 scope global br-lan
valid_lft forever preferred_lft forever
19: wl1.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master br-lan qlen 1000
link/ether 72:cb:85:f7:e5:ab brd ff:ff:ff:ff:ff:ff
29: wds1.1.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master br-lan qlen 1000
link/ether 72:cb:85:f7:e5:ab brd ff:ff:ff:ff:ff:ff
30: wds1.1.2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master br-lan qlen 1000
link/ether 72:cb:85:f7:e5:ab brd ff:ff:ff:ff:ff:ff
root:~# brctl show
bridge name bridge id STP enabled interfaces
br-lan 7000.0ccb85f7e5a8 yes eth1
wds1.1.1
wds1.1.2
wl0
wl1
wl1.1
root:~# dmesg | grep br-lan
[ 2257.008455] br-lan: port 1(eth1) entered blocking state
[ 2257.013706] br-lan: port 1(eth1) entered listening state
[ 2259.046965] br-lan: port 1(eth1) entered learning state
[ 2261.094953] br-lan: port 1(eth1) entered forwarding state
[ 2261.100376] br-lan: topology change detected, propagating
[ 2271.342450] br-lan: port 1(eth1) entered disabled state
[ 2279.536780] br-lan: port 1(eth1) entered blocking state
[ 2279.542056] br-lan: port 1(eth1) entered listening state
[ 2281.574810] br-lan: port 1(eth1) entered learning state
[ 2283.622807] br-lan: port 1(eth1) entered forwarding state
[ 2283.628240] br-lan: topology change detected, propagating
[ 4835.714957] br-lan: received packet on wl1 with own address as source
address (addr:0c:cb:85:f7:e5:aa, vlan:0)
[ 6689.781276] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[10165.333204] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[20921.866775] br-lan: port 5(wds1.1.1) entered disabled state
[20921.883309] br-lan: port 5(wds1.1.1) entered disabled state
[20922.512373] br-lan: received packet on wl1 with own address as source
address (addr:0c:cb:85:f7:e5:aa, vlan:0)
[20923.718768] br-lan: port 5(wds1.1.1) entered blocking state
[20923.725229] br-lan: port 5(wds1.1.1) entered disabled state
[20923.737857] br-lan: port 5(wds1.1.1) entered blocking state
[20923.743492] br-lan: port 5(wds1.1.1) entered listening state
[20925.766397] br-lan: port 5(wds1.1.1) entered learning state
[20927.814380] br-lan: port 5(wds1.1.1) entered forwarding state
[20927.820154] br-lan: topology change detected, propagating
[20930.280812] br-lan: port 5(wds1.1.1) received tcn bpdu
[20930.285982] br-lan: topology change detected, propagating
[20948.714635] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[26002.362865] br-lan: received packet on wl1 with own address as source
address (addr:0c:cb:85:f7:e5:aa, vlan:0)
[26003.804245] br-lan: port 6(wds1.1.2) entered disabled state
[26003.821039] br-lan: port 6(wds1.1.2) entered disabled state
[26005.660527] br-lan: port 6(wds1.1.2) entered blocking state
[26005.667707] br-lan: port 6(wds1.1.2) entered disabled state
[26005.680231] br-lan: port 6(wds1.1.2) entered blocking state
[26005.685845] br-lan: port 6(wds1.1.2) entered listening state
[26007.703587] br-lan: port 6(wds1.1.2) entered learning state
[26009.751572] br-lan: port 6(wds1.1.2) entered forwarding state
[26009.757342] br-lan: topology change detected, propagating
[26010.603790] br-lan: port 6(wds1.1.2) received tcn bpdu
[26010.608954] br-lan: topology change detected, propagating
[26903.288550] br-lan: received packet on wl1 with own address as source
address (addr:0c:cb:85:f7:e5:aa, vlan:0)
[29308.403115] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[44074.437481] br-lan: port 5(wds1.1.1) entered disabled state
[44074.453464] br-lan: port 5(wds1.1.1) entered disabled state
[44075.721563] br-lan: port 5(wds1.1.1) entered blocking state
[44075.727494] br-lan: port 5(wds1.1.1) entered disabled state
[44075.740713] br-lan: port 5(wds1.1.1) entered blocking state
[44075.746331] br-lan: port 5(wds1.1.1) entered listening state
[44077.811280] br-lan: port 5(wds1.1.1) entered learning state
[44079.859259] br-lan: port 5(wds1.1.1) entered forwarding state
[44079.865029] br-lan: topology change detected, propagating
[44082.572293] br-lan: port 5(wds1.1.1) received tcn bpdu
[44082.577454] br-lan: topology change detected, propagating
[44221.999541] br-lan: port 6(wds1.1.2) entered disabled state
[44222.022059] br-lan: port 6(wds1.1.2) entered disabled state
[44223.231419] br-lan: port 6(wds1.1.2) entered blocking state
[44223.237146] br-lan: port 6(wds1.1.2) entered disabled state
[44223.249414] br-lan: port 6(wds1.1.2) entered blocking state
[44223.255030] br-lan: port 6(wds1.1.2) entered listening state
[44225.265897] br-lan: port 6(wds1.1.2) entered learning state
[44227.313875] br-lan: port 6(wds1.1.2) entered forwarding state
[44227.319647] br-lan: topology change detected, propagating
[44228.227914] br-lan: port 6(wds1.1.2) received tcn bpdu
[44228.233077] br-lan: topology change detected, propagating
[44228.625036] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[55550.135997] br-lan: received packet on wl1 with own address as source
address (addr:0c:cb:85:f7:e5:aa, vlan:0)
[56437.513600] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[56900.600612] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[57338.311331] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[57399.986991] br-lan: received packet on wl1 with own address as source
address (addr:0c:cb:85:f7:e5:aa, vlan:0)
[57545.345542] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[58224.520851] br-lan: received packet on wl0 with own address as source
address (addr:0c:cb:85:f7:e5:ab, vlan:0)
[61335.029068] br-lan: received packet on wl1 with own address as source
address (addr:0c:cb:85:f7:e5:aa, vlan:0)
root:~# ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
64 bytes from 192.168.1.1: seq=0 ttl=64 time=0.181 ms
^C
--- 192.168.1.1 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 0.181/0.181/0.181 ms
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