linux-kernel - Re: NULL pointer dereference in the kernel 3.10

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Date:   Mon, 10 Apr 2017 22:33:56 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     Willy Tarreau <w@....eu>
CC:     Michal Hocko <mhocko@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Johannes Weiner <hannes@...xchg.org>, <vdavydov.dev@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Linux Memory Management List" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: NULL pointer dereference in the kernel 3.10

On 2017/4/10 22:13, Willy Tarreau wrote:
> On Mon, Apr 10, 2017 at 10:06:59PM +0800, zhong jiang wrote:
>> On 2017/4/10 20:48, Michal Hocko wrote:
>>> On Mon 10-04-17 20:10:06, zhong jiang wrote:
>>>> On 2017/4/10 16:56, Mel Gorman wrote:
>>>>> On Sat, Apr 08, 2017 at 09:39:42PM +0800, zhong jiang wrote:
>>>>>> when runing the stabile docker cases in the vm.   The following issue will come up.
>>>>>>
>>>>>> #40 [ffff8801b57ffb30] async_page_fault at ffffffff8165c9f8
>>>>>>     [exception RIP: down_read_trylock+5]
>>>>>>     RIP: ffffffff810aca65  RSP: ffff8801b57ffbe8  RFLAGS: 00010202
>>>>>>     RAX: 0000000000000000  RBX: ffff88018ae858c1  RCX: 0000000000000000
>>>>>>     RDX: 0000000000000000  RSI: 0000000000000000  RDI: 0000000000000008
>>>>>>     RBP: ffff8801b57ffc10   R8: ffffea0006903de0   R9: ffff8800b3c61810
>>>>>>     R10: 00000000000022cb  R11: 0000000000000000  R12: ffff88018ae858c0
>>>>>>     R13: ffffea0006903dc0  R14: 0000000000000008  R15: ffffea0006903dc0
>>>>>>     ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0000
>>>>> Post the full report including the kernel version and state whether any
>>>>> additional patches to 3.10 are applied.
>>>>>
>>>>  Hi, Mel
>>>>    
>>>>         Our kernel from RHEL 7.2, Addtional patches all from upstream -- include Bugfix and CVE.
>>> I believe you should contact Redhat for the support. This is a) old
>>> kernel and b) with other patches which might or might not be relevant.
>>   Ok, regardless of the kernel version, we just discuss the situation in theory.  if commit
>>   624483f3ea8  ("mm: rmap: fix use-after-free in __put_anon_vma")  is not exist. the issue
>>  will trigger . Any thought.
> But this commit was backported into 3.10.43, so stable kernel users are safe.
>
> Regards,
> Willy
>
> .
  yes,  you are sure that the commit can fix the issue.