High CPU usage by dnsmasq w/ Router Advertisement

[bsiegel]

Hi there, I've been trying to track down the cause of an issue where I am seeing 30-40% constant CPU usage by dnsmasq in 384.4 (can't confirm if it's new in this version, I was on a legacy version of the firmware previously). I flashed the new 384.4 and then re-initialized the device to clear all settings. The combination that seems to cause dnsmasq to use CPU is enabling IPv6 Router Advertisement. With the same IPv6 configuration and RA disabled, CPU usage for dnsmasq is normal (but I lose IPv6 internet connectivity). I've attached a screenshot of my settings and the relevant log lines are here: https://pastebin.com/NZPq6sGg