Br-lan: received packet on lan0 with own address as source address

Hi Everyone

Today I have updated several times from TOS 3.x to TOS 5.3.7. After completing the upgrade, a few minutes later the router was no longer accessible. The internet was also no longer accessible. The heartbeat of the router is ok. After a few minutes (5-10) the router is reachable again. Under systemlog, I find every time the error occurs the following entrys:

Apr 16 03:19:22 turris kernel: [ 9585.772289] br-lan: received packet on lan0 with own address as source address

This problem repeats itself every few minutes.

I enabled Spanning Tree Protocol and IGMP snooping on the corresponding interface. Since then, the failures have been reduced to every few hours.

Under TOS 3.x the router ran perfectly.

Device: Turris Omnia
reForis version 1.1.2
Turris OS version 5.3.7
Turris OS branch HBS
Kernel version 4.14.274