Error on ovnkube-node pods: "assertion ovs_list_is_empty(&f->list_node) failed in flood_remove_flows_for_sb_uuid()"

Issue

• OVN controller does not get ready on ovnkube-node pods, throwing errors like the following one:

2021-03-29T14:15:24.918797367Z 2021-03-29T14:15:24Z|00002|rconn(ovn_pinctrl0)|INFO|unix:/var/run/openvswitch/br-int.mgmt: connecting...
2021-03-29T14:15:24.920258767Z 2021-03-29T14:15:24Z|00003|rconn(ovn_pinctrl0)|INFO|unix:/var/run/openvswitch/br-int.mgmt: connected
2021-03-29T14:17:47.892178610Z ovn-controller: 2021-03-29T14:17:47.892264515Z controller/ofctrl.c:1198: assertion ovs_list_is_empty(&f->list_node) failed in flood_remove_flows_for_sb_uuid()2021-03-29T14:17:47.892291742Z

• The problem implies that the ovnkube-node pods are being constantly restarted.