wireguard/netifd: Second wireguard interfaces does not initialize correctly on reboot

[schuettecarsten]

On most restarts of the router, my second wireguard interface (see screenshot below) is not initialized properly. The interface does not work, RX/TX counters are at 0. Restarting the interface or the network does not fix the issue, if the interfaces does not come up after a reboot, you have to reboot the whole device and hope that it works this time - if not, reboot again. In most cases, it works after two or three reboots.

netifd logs look like the interface is up and running, but it is not:

Oct  6 10:54:48 GatewayDummi netifd: Interface 'vpn_wg1' is now down
Oct  6 10:54:48 GatewayDummi netifd: Interface 'vpn_wg1' is setting up now
Oct  6 10:54:49 GatewayDummi netifd: Interface 'vpn_wg0' is now down
Oct  6 10:54:49 GatewayDummi netifd: Interface 'vpn_wg0' is setting up now
Oct  6 10:54:49 GatewayDummi netifd: Interface 'vpn_wg1' is now up
Oct  6 10:54:49 GatewayDummi netifd: Network device 'vpn_wg1' link is up
Oct  6 10:54:49 GatewayDummi netifd: Interface 'vpn_wg0' is now up
Oct  6 10:54:49 GatewayDummi netifd: Network device 'vpn_wg0' link is up

Screenshot:

I need to use two wireguard interfaces because they have different routing tables. The first interface is for "normal" VPN access, the second is for policy-based routing (pbr). The wireguard issue is not related to pbr because it also happens when I disable pbr completely.