kernel: arpresolve: can't allocate llinfo for ... on lagg0_vlanX

[sinuswave]

I am loosing upstream gateway connectivity on a bare metal multiwan two member cluster setup after boot. Networking is connected via lagg und vlans. After reboot, the logs are flooded with

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kernel: arpresolve: can't allocate llinfo for 192.168.56.1 on lagg0_vlan432
and the upstream gateways are offline.

Setting up an static arp entry fails after reboot:

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arp -S 192.168.56.1  <mac address>
arp: writing to routing socket: No such file or directory
arp: writing to routing socket: Cannot allocate memory
However when I just save and apply the unchanged settings on the affected interface using the web gui, the gateways recovers. Also the arp table shows the ip and mac address.

Any ideas?

Steps to reproduce:
1. Setup two 19.1 machines
2. Setup statci ips on lan and wan
3. setup virtual ips on lan and wan using carp
4. setup upstream gateways using monitor IPs

[Matzke]

I have a similar problem. see: https://forum.opnsense.org/index.php?topic=12554.0