On 2018-12-18 15:40:34 [-0500], Steven Rostedt wrote:
>
> Dear RT Folks,
>
> I'm pleased to announce the 4.14.87-rt49 stable release.
This contains also commit
e8499ab5b93ac ("x86/fpu: Disable bottom halves while loading FPU registers")
which means you need commit
[PATCH] x86/fpu: Disable preemption around local_bh_disable()
https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/plain/patches/x86-fpu-Disable-preemption-around-local_bh_disable.patch?h=linux-4.19.y-rt-patches
Sebastian
