Hello, >=~4.14.0 (git commit 185981d5), due to 'include/linux/timer.h' git tag --contains 185981d5 v4.15-rc1 and no, I don't want to patch it for rc kernels FYI the correct patch is here https://www.virtualbox.org/pipermail/vbox-dev/2017-December/014885.html G.