kernel warning with 0.0.20170223: entered softirq 3 NET_RX net_rx_action+0x0/0x760 with preempt_count 00000101, exited with 00000100?

[Timothée Ravier]

Hi,

With the following setup, both client & server running:
* Arch Linux
* kernel 4.9.11.r201702222257-1-grsec
* wireguard-dkms & wireguard-tools 0.0.20170223

Server:
interface: wg0
  public key: ...
  private key: ...
  listening port: 51820

peer: ...
  endpoint: ...:51820
  allowed ips: 192.168.42.1/32

Client:
interface: wg0
  public key: ...
  private key: ...
  listening port: 51820

peer: ...
  endpoint: ...:51820
  allowed ips: 192.168.42.100/32

I get the following warning in the kernel log for each received packets
(a simple ping triggers it):
softirq: huh, entered softirq 3 NET_RX net_rx_action+0x0/0x760 with
preempt_count 00000101, exited with 00000100?

I am using nftables on the server side but iptables on the client side.

Thanks,

Tim