linux-kernel - Re: [PATCH -next v2] mm/hotplug: fix a null-ptr-deref during NUMA boot

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Message-ID: <CAFgQCTvAaWvnZYYeg-TqCMtYdgGu-r29iGu4igoQ-RRkRkYmVw@mail.gmail.com>
Date:   Thu, 27 Jun 2019 11:11:36 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Qian Cai <cai@....pw>, Andrew Morton <akpm@...ux-foundation.org>,
        Barret Rhoden <brho@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Ingo Molnar <mingo@...e.hu>,
        Oscar Salvador <osalvador@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next v2] mm/hotplug: fix a null-ptr-deref during NUMA boot

On Wed, Jun 26, 2019 at 9:57 PM Michal Hocko <mhocko@...nel.org> wrote:
>
> On Mon 24-06-19 16:42:20, Pingfan Liu wrote:
> > Hi Michal,
> >
> > What about dropping the change of the online definition of your patch,
> > just do the following?
>
> I am sorry but I am unlikely to find some more time to look into this. I
> am willing to help reviewing but I will not find enough time to focus on
> this to fix up the patch. Are you willing to work on this and finish the
> patch? It is a very tricky area with side effects really hard to see in
> advance but going with a robust fix is definitely worth the effort.
Yeah, the bug is a little trivial but hard to fix bug, and take a lot
of time. It is hard to meet your original design target, based on
current situation. I will have a try limited to this bug.

Thanks,
  Pingfan
>
> Thanks!
> --
> Michal Hocko
> SUSE Labs