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Date: Mon, 9 Sep 2013 12:33:40 +0800
Message-ID: <CAJd=RBAd6-kX127cdTs10Ty7LJ+cGQX8NvX9H1bb4QSh4erzLw@mail.gmail.com>
Subject: Re: hugetlb: NULL ptr deref in region_truncate
From: Hillf Danton <dhillf@gmail.com>
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Sender: owner-linux-mm@kvack.org
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To: Sasha Levin <sasha.levin@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Michal Hocko <mhocko@suse.cz>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Wanpeng Li <liwanp@linux.vnet.ibm.com>, LKML <linux-kernel@vger.kernel.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, trinity@vger.kernel.org

On Sun, Sep 8, 2013 at 10:46 PM, Sasha Levin <sasha.levin@oracle.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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