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Date: Wed, 20 Dec 2017 11:00:29 +0100
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in
 __list_del_entry_valid
Message-ID: <20171220100029.GH4831@dhcp22.suse.cz>
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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>, LKML <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>, Mel Gorman <mgorman@techsingularity.net>, Minchan Kim <minchan@kernel.org>, Shakeel Butt <shakeelb@google.com>, syzkaller-bugs@googlegroups.com, ying.huang@intel.com, syzkaller <syzkaller@googlegroups.com>

On Wed 20-12-17 10:24:51, Dmitry Vyukov wrote:
> On Wed, Dec 20, 2017 at 10:20 AM, Michal Hocko <mhocko@kernel.org> wrote:
> > On Tue 19-12-17 17:40:19, Dmitry Vyukov wrote:
> >> On Tue, Dec 19, 2017 at 2:42 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.
> >>
> >>
> >> So are these duplicates? If yes, we need to tell this syzbot:
> >
> > It seems so.
> 
> Please tell this directly to syzbot next time.
> 
> #syz dup: general protection fault in __list_del_entry_valid (2)

OK.

-- 
Michal Hocko
SUSE Labs

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