panic: vm_fault: fault on nofault entry

[Glen Barber]

On Mon, Mar 10, 2014 at 05:46:06PM +0200, Konstantin Belousov wrote:
> On Sun, Mar 09, 2014 at 02:16:57PM -0400, Glen Barber wrote:
> > panic: vm_fault: fault on nofault entry, addr: fffffe03becbc000
> 
> I see, this panic is for access to the kernel map, not for the direct map.
> I think that this is a race with other CPU unmapping some page in the
> kernel map, which cannot be solved by access checks.
> 
> Please try the following.  I booted with the patch and checked that
> kgdb /boot/kernel/kernel /dev/mem works, but did not tried to reproduce
> the issue.
> 

Thank you for looking into this.  I will report back.

Glen

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