Re: kthread_stop insanity (Re: [[DEBUG] force] 2642458962: BUG: unable to handle kernel paging request at ffffc90000997f18)

[Oleg Nesterov]

On 06/28, Andy Lutomirski wrote:
>
> On Tue, Jun 28, 2016 at 1:12 PM, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
> >
> > So please forget unless you see another reason for this change.
> >
>
> But I might need to that anyway for procfs to read the the stack,
> right?  Do you see another way to handle that case?

Well, we could use probe_kernel_text() and recheck tsk->stack != NULL
after this.

But,

> I'm thinking of adding:
>
> void *try_get_task_stack(struct task_struct *tsk);
> void put_task_stack(struct task_struct *tsk);

Yes, agreed, this looks better.

Oleg.