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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Fri, 22 Mar 2019 09:00:48 +0100
Message-ID: <CACT4Y+YVNA6aYe-Ai-ZnU+EhNSNAFhjvXPT0oA+i4rCFpQThcg@mail.gmail.com>
Subject: Re: INFO: task hung in vivid_stop_generating_vid_cap
To:     syzbot <syzbot+06283a66a648cd073885@syzkaller.appspotmail.com>,
        linux-can@vger.kernel.org
Cc:     andy@greyhouse.net, David Miller <davem@davemloft.net>,
        Hans Verkuil <hverkuil@xs4all.nl>, j.vosburgh@gmail.com,
        LKML <linux-kernel@vger.kernel.org>, linux-media@vger.kernel.org,
        Mahesh Bandewar <maheshb@google.com>, mchehab@kernel.org,
        netdev <netdev@vger.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
        vfalico@gmail.com
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On Fri, Mar 22, 2019 at 8:08 AM syzbot
<syzbot+06283a66a648cd073885@syzkaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit 4493b81bea24269df898339dee638d7c5cb2b2df
> Author: Mahesh Bandewar <maheshb@google.com>
> Date:   Wed Mar 8 18:55:54 2017 +0000
>
>      bonding: initialize work-queues during creation of bond

+linux-can

I think I will disable CONFIG_CAN before v4.12. It causes too many
false results for v4.12..v4.11 range. It always leads to a wrong
decision for first 3 steps, then no chances of correct bisection
anymore.

> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=176d1617200000
> start commit:   4493b81b bonding: initialize work-queues during creation o..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=14ed1617200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=10ed1617200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=62118286bb772a24
> dashboard link: https://syzkaller.appspot.com/bug?extid=06283a66a648cd073885
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15701a33400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=154c8e4d400000
>
> Reported-by: syzbot+06283a66a648cd073885@syzkaller.appspotmail.com
> Fixes: 4493b81bea24 ("bonding: initialize work-queues during creation of
> bond")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection