luci: Bug : Viewing realtime connection causes LuCI to crash with a lot of active connections.

Described on https://forum.openwrt.org/t/luci-crash-on-19-07-2-when-visiting-admin-status-realtime-connections/60674/8

Reposting my post from there

When active connection is high (Above 2-3k) the following command

ubus call luci getRealtimeStats '{ "mode": "conntrack" }'

Works just fine and returns a reply.

And this

ubus call luci getConntrackList

Just hangs an causes Luci to return

/usr/lib/lua/luci/dispatcher.lua:426: /etc/config/luci seems to be corrupt, unable to find section 'main'

Only restarting rpcd gets it back using

service rpcd restart

My device has plenty of ram (RPI) so i think the code for returning the connection list doesnt really work with large numbers, I guess it should only return the top 100 connections or something like that.

Using my mobile app on my router (https://github.com/hagaygo/OpenWRTManager) with “Active Connections” overview causes LuCI to keep crashing while there is a lot of active connections. It uses same API as real time page.

Using 19.07.6