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Subject: Re: [PATCH] thp, mm: Fix crash due race in MADV_FREE handling
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>
References: <20170628101249.17879-1-kirill.shutemov@linux.intel.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Huang Ying <ying.huang@intel.com>, Minchan Kim <minchan@kernel.org>
From: Dave Hansen <dave.hansen@intel.com>
Message-ID: <ad66e93e-7219-6c07-3d11-43c0b45e3095@intel.com>
Date: Wed, 28 Jun 2017 07:26:51 -0700
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I came up with the exact same patch.  For posterity, here's the test
case, generated by syzkaller and trimmed down by Reinette:

	https://www.sr71.net/~dave/intel/log2.c

And the config that helps detect this:

	https://www.sr71.net/~dave/intel/config-log2

Acked-by: Dave Hansen <dave.hansen@intel.com>