linux-kernel - Re: hugetlb: NULL ptr deref in region

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Date:	Mon, 9 Sep 2013 12:33:40 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, trinity@...r.kernel.org
Subject: Re: hugetlb: NULL ptr deref in region_truncate

On Sun, Sep 8, 2013 at 10:46 PM, Sasha Levin <sasha.levin@...cle.com> wrote:
> Hi all,
>
> While fuzzing with trinity inside a KVM tools guest, running latest -next
> kernel, I've
> stumbled on the following:
>
> [  998.281867] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000274
> [  998.283333] IP: [<ffffffff812707c4>] region_truncate+0x64/0xd0
> [  998.284288] PGD 0
> [  998.284717] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
> [  998.286506] Modules linked in:
> [  998.287101] CPU: 88 PID: 24650 Comm: trinity-child85 Tainted: G    B   W
> 3.11.0-next-20130906-sasha #3985

 *  'B' - System has hit bad_page?
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