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Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c

From Linus Torvalds <torvalds@linux-foundation.org>
Newsgroups linux.kernel
Subject Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c
Date 2017-06-21 22:40 +0200
Message-ID <tUUzT-2OU-1@gated-at.bofh.it> (permalink)
References (1 earlier) <tUDSp-cS-3@gated-at.bofh.it> <tUSy6-1pG-33@gated-at.bofh.it> <tUTDQ-2a7-3@gated-at.bofh.it> <tUTDQ-2a7-1@gated-at.bofh.it> <tUUqe-2L1-25@gated-at.bofh.it>
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On Wed, Jun 21, 2017 at 1:27 PM, Oleg Nesterov <oleg@redhat.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

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Re: [lkp-robot] [mm]  1be7107fbe: kernel_BUG_at_mm/mmap.c Hugh Dickins <hughd@google.com> - 2017-06-21 04:50 +0200
  Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Linus Torvalds <torvalds@linux-foundation.org> - 2017-06-21 20:30 +0200
    Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Linus Torvalds <torvalds@linux-foundation.org> - 2017-06-21 21:40 +0200
      Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Oleg Nesterov <oleg@redhat.com> - 2017-06-21 22:30 +0200
        Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Linus Torvalds <torvalds@linux-foundation.org> - 2017-06-21 22:40 +0200
          Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Oleg Nesterov <oleg@redhat.com> - 2017-06-21 23:00 +0200
            Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Linus Torvalds <torvalds@linux-foundation.org> - 2017-06-22 00:20 +0200
              Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Hugh Dickins <hughd@google.com> - 2017-06-22 03:10 +0200
                Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Oleg Nesterov <oleg@redhat.com> - 2017-06-22 17:20 +0200
                Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Hugh Dickins <hughd@google.com> - 2017-06-22 20:10 +0200
                Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Oleg Nesterov <oleg@redhat.com> - 2017-06-22 23:00 +0200
    Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Oleg Nesterov <oleg@redhat.com> - 2017-06-21 21:40 +0200
      Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Hugh Dickins <hughd@google.com> - 2017-06-22 06:30 +0200
    Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c Hugh Dickins <hughd@google.com> - 2017-06-21 21:50 +0200

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