I bisected the dnsmasq commits, and looks like it is caused by this:
15b60ddf935a531269bb8c68198de012a4967156 FAIL
824461192ca5098043f9ca4ddeba7df1f65b30ba Ok ?
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=15b60ddf935a531269bb8c68198de012a4967156
"Handle multiple identical near simultaneous DNS queries better."'
Dnsmasq built from earlier commits seem to avoid the error/warning messages,
while builds after 15b60ddf cause log spam.
This bug is seen by lots of OpenWrt users, based on OpenWrt forum
discussion. E.g. onward from
https://forum.openwrt.org/t/security-advisory-2021-01-19-1-dnsmasq-multiple-vulnerabilities/85903/22
One observation in the forum discussion is that this is only/mainly seen when
then are Windows PCs or Macs active in LAN. IPv6 RA/DHCPv6 may also play a role.
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