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

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Message-ID: <20171220100029.GH4831@dhcp22.suse.cz>
Date:   Wed, 20 Dec 2017 11:00:29 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
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 20-12-17 10:24:51, Dmitry Vyukov wrote:
> 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)

OK.

-- 
Michal Hocko
SUSE Labs