LGTM x86_64, roadwarrior, ipv4, double-NAT, MOBIKE tested VPN server: Centos7, strongswan-5.4.0-2.el7.x86_64
x86_64, HP 850 G4, Intel Kaby Lake, integrated GPU
I have tested kernel-4.11.3-302.fc26.x86_64 with strongswan-5.5.0-3.fc26.x86_64 in a scenario which did not work with the previous (affected) kernels.
HP 850 G4, x86_64, i5-7200U CPU, integrated GPU