linux-kernel - Re: exit_mmap() BUG_ON triggering since 3.1

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Message-ID: <CAL1RGDVQDr-h5Makto-FXHeHUkK4sJooszciiNvVR66WonQ=6w@mail.gmail.com>
Date:	Wed, 15 Feb 2012 18:22:27 -0800
From:	Roland Dreier <roland@...estorage.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kernel-team@...oraproject.org
Subject: Re: exit_mmap() BUG_ON triggering since 3.1

On Wed, Feb 15, 2012 at 6:14 PM, Hugh Dickins <hughd@...gle.com> wrote:
> My suspicion was that it would be related to Transparent HugePages:
> they do complicate the pagetable story.  And I think I have found a
> potential culprit.  I don't know if nr_ptes is the only loser from
> these two split_huge_pages calls, but assuming it is...

Do you have an idea when this bug might have been introduced?
Presumably it's been there since THP came in?

The reason I ask is that I have one of these exit_mm BUG_ONs
in my pile of one-off unreproducible crashes, but in my case it
happened with 2.6.39 (with THP enabled).  So I'm wondering if
I can cross it off my list and blame this bug, or if it remains one
of those inexplicable mysteries...

Thanks,
  Roland
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