FRR 0.6.7_5 Failed to connect to the agentx master agent

[beermount]

Ref: https://forum.netgate.com/topic/155795/frr-0-6-7_3-enable-snmp-agentx

I'm now able to enable the snmp agentx module, but it seems like the snmp agentx socket is unstable. It works fine for lldpd, but with FRR I only get a short initial connection from zebra before it seems to stop working again.

Aug 28 16:04:57 ospfd 12061 [EC 100663310] snmp[warning]: Warning: Failed to connect to the agentx master agent ([NIL]):
Aug 28 16:04:57 zebra 11170 [EC 100663310] snmp[warning]: Warning: Failed to connect to the agentx master agent ([NIL]):
Aug 28 16:03:27 ospfd 12061 [EC 100663310] snmp[warning]: Warning: Failed to connect to the agentx master agent ([NIL]):
Aug 28 16:03:27 zebra 11170 [EC 100663310] snmp[warning]: Warning: Failed to connect to the agentx master agent ([NIL]):
Aug 28 16:02:10 zebra 76603 snmp[info]: NET-SNMP version 5.7.3 AgentX subagent connected

The problem is the same for all FRR modules I've tested. bgpd, ospfd and ospf6d.

Is this because I have a full bgp table for IPv6 ?