Re: kernel BUG at mm/mempolicy.c:1699!

[Vegard Nossum]

On 07/29/2016 08:05 PM, Dmitry Vyukov wrote:
> On Fri, Jul 29, 2016 at 7:57 PM, Vegard Nossum <vegard.nossum@xxxxxxxxxx> wrote:
> > ------------[ cut here ]------------
> > kernel BUG at mm/mempolicy.c:1699!
[...]
> > In particular, it's interesting that the kernel/exit.c line is
> >
> >      mpol_put(tsk->mempolicy);
> >
> > and alloc_pages_current() does (potentially):
> >
> >      pol = get_task_policy(current);.
> >
> > The bug seems very new or very rare or both.
>
> This is https://github.com/google/kasan/issues/35
> It is introduced with stackdepot.

Ah, cool.

Would it be enough to set __GFP_THISNODE in depot_save_stack() so it
uses &default_policy instead of current->mempolicy?


Vegard