Re: [4.9-rc3] BUG: unable to handle kernel paging request at ffffc900144dfc60

[Linus Torvalds]

On Wed, Nov 2, 2016 at 4:50 AM, Tetsuo Handa
<penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote:
>>
>> So I _think_ the fix is to just remove this. Perhaps something like
>> the attached? Adding scheduler people since this is in their code..
>
> That is not sufficient, for another Oops occurs inside stack_not_used().
> Since I don't want to break stack_not_used(), can we tolerate nested
> try_get_task_stack() usage and protect the whole sched_show_task()?

Sure, looks good to me.

But as Andy says, we should probably apply my patch too, just to get
rid of the useless hex printk and the ugly ifdeffery.

PeterZ/Ingo?

                Linus