strace lockup when tracing exec in go

[Mike Galbraith]

On Thu, 2016-09-22 at 11:53 +0200, Michal Hocko wrote:
> On Thu 22-09-16 11:40:09, Mike Galbraith wrote:

> > This patch doesn't help, nor does the previous patch... but with both
> > applied, all is well.  All you have to do now is figure out why :)
> 
> Ohh, I should be more explicit, this needs the mm_access part as well.
> Sorry for not being clear enough. So the full change is

Ah.  That was gonna happen after lunch, but since you already know it
works, I can get back to un-b0rking one of my trees.

	-Mike