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

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Message-ID: <CAJd=RBCQxfzCQ_v3C+yR1yH0=uCvLvd3rDK-TDJf0MwM7OYyaQ@mail.gmail.com>
Date:	Mon, 28 May 2012 20:00:48 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	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>,
	l@...per.es
Subject: Re: mm: kernel BUG at mm/memory.c:1230

Hi Hugh

On Sun, May 27, 2012 at 4:26 AM, Hugh Dickins <hughd@...gle.com> wrote:
>
> Whereas in exiting, rwsem is not locked, but we're going linearly upwards,
> and whenever we walk into a pmd_trans_huge area, both addr and next should
> be hpage aligned: the vma bounds are unsuited to THP if they're unaligned.
>
Take a look at the dependence of huge page size on PAE,

             [PATCH] KVM: MMU: fix huge page adapted on non-PAE host
             https://lkml.org/lkml/2012/5/28/39

and hope that is helpful.
-hd
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