Hi, (please keep me in CC, thanks)
I got the following somewhat strangely formatted log lines in /var/log/messages on a BIRD v2.0.6 instance connected to routinator3000 v0.5 ("r3k" bellow) running on FreeBSD 12: kernel: 8-48 AS2119 kernel: CS_UP' failed at nest/rt-table.c:1543 kernel: 9-22T00:59:04.466158+01:00 - - Assertion 'c->channel_state == CS_UP' failed at nest/rt-table.c:1543 kernel: Assertion 'c->channel_state == CS_UP' failed at nest/rt-table.c:1543 kernel: 6f8::/32-32 AS25525 kernel: :59:05.654000+01:00 bird 1144 - - Assertion 'c->channel_state == CS_UP' failed at nest/rt-table.c:1543 kernel: P' failed at nest/rt-table.c:1543 kernel: acket (81.89.96.0/20-20 AS35366) kernel: nel_state == CS_UP' failed at nest/rt-table.c:1543 kernel: at nest/rt-table.c:1543 kernel: 22T00:59:10.355042+01:00 bird 1144 - - r3k: Received IPv4 Prefix packet (46.252.16.0/20-24 AS20738) kernel: ate == CS_UP' failed at nest/rt-table.c:1543 kernel: 0 bird 1144 - - Assertion 'c->channel_state == CS_UP' failed at nest/rt-table.c:1543 kernel: 9)