linux-kernel - Re: mm: kernel BUG at mm/memory.c:1230

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Message-ID: <CA+1xoqfGeQjrVWM3p4M0hV=hAwzx18bcoH7Bcn1mv_vOE8hDRw@mail.gmail.com>
Date:	Sun, 27 May 2012 22:45:28 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	viro <viro@...iv.linux.org.uk>, oleg@...hat.com,
	"a.p.zijlstra" <a.p.zijlstra@...llo.nl>, mingo <mingo@...nel.org>,
	Dave Jones <davej@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: mm: kernel BUG at mm/memory.c:1230

On Sat, May 26, 2012 at 10:26 PM, Hugh Dickins <hughd@...gle.com> wrote:
> I'm keeping off the linux-next for the moment; I'll worry about this
> more if it shows up when we try 3.5-rc1.  Your fuzzing tells that my
> logic above is wrong, but maybe it's just a passing defect in next.

I have a theory about this, which might explain it.

After a couple of days of not being able to reproduce it, I've decided
to revert Mel Gorman's patch related to memory corruption in mbind().
Once I've reverted it, I wasn't able to reproduce this exact case, but
did observe several other interesting things:

 - The original mbind() memory corruption.
 - Corruption in eventfd related structures (same dump as the mbind
one, but about eventfd structure).
 - Same as above, but with flock.
 - Hit a different BUG() in mm/mempolicy.c (The one at the end of slab_node()).

Is it possible that this issue could be explained by a corruption
related to the mbind() issue?
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