linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference in __list_del_entry

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Date:   Wed, 20 Dec 2017 10:24:51 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     syzbot 
        <bot+83f46cd25e266359cd056c91f6ecd20b04eddf42@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Minchan Kim <minchan@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        syzkaller-bugs@...glegroups.com, ying.huang@...el.com,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in __list_del_entry_valid

On Wed, Dec 20, 2017 at 10:20 AM, Michal Hocko <mhocko@...nel.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@...nel.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@...gle.com
>> >> > while this one has 001a11452568f5857c0560b0dc0e@...gle.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)