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

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Message-ID: <20170410140646.hyfbzc5367442hty@techsingularity.net>
Date:   Mon, 10 Apr 2017 15:06:46 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     zhong jiang <zhongjiang@...wei.com>
Cc:     Michal Hocko <mhocko@...e.com>,
        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 Mon, Apr 10, 2017 at 08:10:06PM +0800, 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.
> 
> Commit 624483f3ea8 ("mm: rmap: fix use-after-free in __put_anon_vma") exclude in
> the RHEL 7.2. it looks seems to the issue. but I don't know how it triggered.
> or it is not the correct fix.  Any suggestion? Thanks
> 

I'm afraid you'll need to bring it up with RHEL support as it contains
a number of backported patches from them that cannot be meaningfully
evaluated outside of RedHat and they may have additional questions on the
patches applied on top.

-- 
Mel Gorman
SUSE Labs