linux-kernel - Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at

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Message-ID: <CA+55aFyupxx0K6SCi5_vd5nt0FmUYrYGF6yB+k9F+9zbgMwsiQ@mail.gmail.com>
Date:   Wed, 21 Jun 2017 13:30:28 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Hugh Dickins <hughd@...gle.com>,
        kernel test robot <xiaolong.ye@...el.com>,
        Michal Hocko <mhocko@...e.com>,
        LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>
Subject: Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c

On Wed, Jun 21, 2017 at 1:27 PM, Oleg Nesterov <oleg@...hat.com> wrote:
>
> Now __do_page_fault() tries to expand the stack itself, and this check
> fails.

But we want that check to trigger and cause the access to fail.
Accessing the stack below the stack pointer is wrong.

Do you have a pointer to the report for this regression? I must have missed it.

                Linus