Kernel crashes in VirtualBox module after commit 2ecd9d29abb1

[Larry Finger]

A problem with the VirtualBox kernel module vboxdrv.ko has been bisected to 
commit 2ecd9d29abb1 "sched, preempt_notifier: separate notifier registration 
from static_key inc/dec".  The affected kernels crash is various ways. The most 
instructive includes a warning issued at kernel/sched/core.c:2342 in 
prempt_notifier_register() for "registering prempt_notifier while notifiers 
disabled" The call from vboxdrv is as follows:

        /*
         * Register the callback.
         */
        preempt_disable();
        pThis->fEnabled = true;
        preempt_notifier_register(&pThis->LnxPreemptNotifier);
        preempt_enable();

As I have no reason to suspect the kernel after this patch, I would like some 
suggestions regarding the best method to patch/fix the VirtualBox code.

Thanks,

Larry
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