Re: INFO: task hung in __do_page_fault (2)

[Andy Lutomirski]

On Wed, Nov 20, 2019 at 11:52 AM syzbot
<syzbot+6b074f741adbd93d2df5@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> syzbot has bisected this bug to:
>
> commit 0161028b7c8aebef64194d3d73e43bc3b53b5c66
> Author: Andy Lutomirski <luto@xxxxxxxxxx>
> 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@xxxxxxxxxxxxxxxxxxxxxxxxx
> 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