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Date: Tue, 19 Dec 2017 14:42:35 +0100
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in
 __list_del_entry_valid
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To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzbot <bot+83f46cd25e266359cd056c91f6ecd20b04eddf42@syzkaller.appspotmail.com>, Andrew Morton <akpm@linux-foundation.org>, Johannes Weiner <hannes@cmpxchg.org>, Hillf Danton <hillf.zj@alibaba-inc.com>, LKML <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>, Mel Gorman <mgorman@techsingularity.net>, Minchan Kim <minchan@kernel.org>, shakeelb@google.com, syzkaller-bugs@googlegroups.com, ying.huang@intel.com, syzkaller <syzkaller@googlegroups.com>

On Tue 19-12-17 14:38:35, Dmitry Vyukov wrote:
> On Tue, Dec 19, 2017 at 2:22 PM, Michal Hocko <mhocko@kernel.org> wrote:
> > On Tue 19-12-17 14:12:38, Dmitry Vyukov wrote:
> >> On Tue, Dec 19, 2017 at 2:03 PM, Michal Hocko <mhocko@kernel.org> wrote:
> >> > Can we silence this duplicates [1] please?
> >> >
> >> > [1] http://lkml.kernel.org/r/001a1140f57806ebef05608b25a5@google.com
> >>
> >> Hi Michal,
> >>
> >> What exactly do you mean?
> >>
> >> These 2 are the same email with the same Message-ID just on different
> >> mailing lists. I don't see anything wrong here.
> >
> > Hmm the other one has Message-id: 001a1140f57806ebef05608b25a5@google.com
> > while this one has 001a11452568f5857c0560b0dc0e@google.com
> 
> Ah, I see.
> These are reported separately because the crashes are titled
> differently. Kernel titled one as "general protection fault" and
> another as "BUG: unable to handle kernel NULL pointer dereference".

Ahh, OK, so I've missed that part ;) I just thought it was duplicate
because the report seemed very familiar.

> What algorithm do you propose to use to merge them?

Maybe based on the stack trace?
-- 
Michal Hocko
SUSE Labs

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