linux-kernel - Re: INFO: task hung in __do_page

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Date:   Thu, 21 Nov 2019 10:01:24 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     syzbot <syzbot+6b074f741adbd93d2df5@...kaller.appspotmail.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Andrew Lutomirski <luto@...nel.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        syzkaller-bugs@...glegroups.com,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: INFO: task hung in __do_page_fault (2)

On Wed, Nov 20, 2019 at 11:52 AM syzbot
<syzbot+6b074f741adbd93d2df5@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit 0161028b7c8aebef64194d3d73e43bc3b53b5c66
> Author: Andy Lutomirski <luto@...nel.org>
> Date:   Mon May 9 22:48:51 2016 +0000
>
>      perf/core: Change the default paranoia level to 2
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15910e86e00000
> start commit:   18d0eae3 Merge tag 'char-misc-4.20-rc1' of git://git.kerne..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=17910e86e00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=13910e86e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=342f43de913c81b9
> dashboard link: https://syzkaller.appspot.com/bug?extid=6b074f741adbd93d2df5
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12482713400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=158fd4a3400000
>
> Reported-by: syzbot+6b074f741adbd93d2df5@...kaller.appspotmail.com
> Fixes: 0161028b7c8a ("perf/core: Change the default paranoia level to 2")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Hi syzbot-

I'm not quite sure how to tell you this in syzbotese, but I'm pretty
sure you've bisected this wrong.  The blamed patch makes no sense.

--Andy