Hi Nils,

I've been unable to reproduce this on a vanilla VM built using `vagrant init debian/buster64; vagrant up`:

root@buster:/home/vagrant# modprobe wireguard
root@buster:/home/vagrant# modinfo wireguard
filename: /lib/modules/4.19.0-5-amd64/updates/dkms/wireguard.ko
alias: net-pf-16-proto-16-family-wireguard
alias: rtnl-link-wireguard
version: 0.0.20190601
author: Jason A. Donenfeld <Jason@zx2c4.com>
description: WireGuard secure network tunnel
license: GPL v2
srcversion: 69000E9D4B2B253E97C189A
depends: udp_tunnel,ip6_udp_tunnel
retpoline: Y
name: wireguard
vermagic: 4.19.0-5-amd64 SMP mod_unload modversions
root@buster:/home/vagrant# dmesg | grep wireguard
[ 17.664193] wireguard: loading out-of-tree module taints kernel.
[ 17.664231] wireguard: module verification failed: signature and/or required key missing - tainting kernel
[ 17.665555] wireguard: WireGuard 0.0.20190601 loaded. See www.wireguard.com for information.
[ 17.665556] wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
root@buster:/home/vagrant# uname -a
Linux buster 4.19.0-5-amd64 #1 SMP Debian 4.19.37-3 (2019-05-15) x86_64 GNU/Linux

The above output was from the WireGuard package from testing, I got similar results compiling WireGuard 0.0.20190601 from source too.

Can you check which version of the linux-image-4.19.0-5-amd64 package you have installed? I'm running 4.19.37-3 for reference.

Cheers,
Steven

On Fri, 21 Jun 2019, at 12:58 AM, Nils Cant wrote:
> Hello,
> 
> I'm unable to load the wireguard kernel module on Debian Sid or Debian Buster. (4.19.0-5-amd64 kernel)
> (Debian buster is scheduled to be promoted to stable in a couple of weeks)
> 
> root@buster:~# modprobe wireguard
> modprobe: ERROR: could not insert 'wireguard': Invalid argument
> root@buster:~# modinfo wireguard
> filename: /lib/modules/4.19.0-5-amd64/updates/dkms/wireguard.ko
> alias: net-pf-16-proto-16-family-wireguard
> alias: rtnl-link-wireguard
> version: 0.0.20190601
> author: Jason A. Donenfeld <Jason@zx2c4.com>
> description: WireGuard secure network tunnel
> license: GPL v2
> srcversion: 69000E9D4B2B253E97C189A
> depends: udp_tunnel,ip6_udp_tunnel
> retpoline: Y
> name: wireguard
> vermagic: 4.19.0-5-amd64 SMP mod_unload modversions
> 
> The same version seems to work fine on Debian Stretch (4.9.0-9) or Fedora Core 30 (5.1.11-300)
> 
> The kernel ring throws a number of symbol version errors:
> 
> [...]
> [ 97.450944] wireguard: loading out-of-tree module taints kernel.
> [ 97.453335] wireguard: module verification failed: signature and/or required key missing - tainting kernel
> [ 97.457727] wireguard: disagrees about version of symbol skb_put
> [ 97.459772] wireguard: Unknown symbol skb_put (err -22)
> [ 97.461555] wireguard: disagrees about version of symbol ip6_dst_hoplimit
> [ 97.463609] wireguard: Unknown symbol ip6_dst_hoplimit (err -22)
> [ 97.465590] wireguard: disagrees about version of symbol consume_skb
> [ 97.467495] wireguard: Unknown symbol consume_skb (err -22)
> [ 97.469326] wireguard: disagrees about version of symbol udp_sock_create4
> [...]
> 
> I have tried both the apt package from debian unstable, as well as compile from source.
> 
> Any idea what could be going wrong? Is this a Debian kernel bug?
> 
> 
> Thanks in advance,
> 
> Nils
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