linux-kernel - Re: kernel BUG at /src/linux-dev/mm/mempolicy.c:1738! on v3.16-rc1

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Message-ID: <alpine.DEB.2.11.1406201531530.5221@gentwo.org>
Date:	Fri, 20 Jun 2014 15:32:40 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Hugh Dickins <hughd@...gle.com>
cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: kernel BUG at /src/linux-dev/mm/mempolicy.c:1738! on v3.16-rc1

On Fri, 20 Jun 2014, Hugh Dickins wrote:

> [PATCH] mm: fix crashes from mbind() merging vmas
>
> v2.6.34's 9d8cebd4bcd7 ("mm: fix mbind vma merge problem") introduced
> vma merging to mbind(), but it should have also changed the convention
> of passing start vma from queue_pages_range() (formerly check_range())
> to new_vma_page(): vma merging may have already freed that structure,
> resulting in BUG at mm/mempolicy.c:1738 and probably worse crashes.

Good catch. Cannot find fault with what I see.

Acked-by: Christoph Lameter <cl@...ux.com>
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