Please consider the upstream commit below for the 4.14.y branch. Without the fix the configuration mentioned in the commit message crashes every time immediately at boot. What's even worse, at least in our setup this crash is completely silent and the computer just seems to hang, so the user gets no hints what actually happened. commit 10d94ff4d558b96bfc4f55bb0051ae4d938246fe Author: Rakib Mullick <rakib.mullick@xxxxxxxxx> Date: Wed Nov 1 10:14:51 2017 +0600 irq/core: Fix boot crash when the irqaffinity= boot parameter is passed on CPUMASK_OFFSTACK=y kernels(v1)