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

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Message-ID: <20171219134235.GW2787@dhcp22.suse.cz>
Date:   Tue, 19 Dec 2017 14:42:35 +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>,
        Hillf Danton <hillf.zj@...baba-inc.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Minchan Kim <minchan@...nel.org>, 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 Tue 19-12-17 14:38:35, Dmitry Vyukov wrote:
> On Tue, Dec 19, 2017 at 2:22 PM, Michal Hocko <mhocko@...nel.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@...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.

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

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