linux-kernel - Re: [syzbot] WARNING in component

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Date:   Wed, 9 Feb 2022 15:42:12 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     syzbot <syzbot+60df062e1c41940cae0f@...kaller.appspotmail.com>
Cc:     andriy.shevchenko@...ux.intel.com, dri-devel@...ts.freedesktop.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        rafael.j.wysocki@...el.com, rafael@...nel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in component_del

On Tue, Feb 08, 2022 at 02:37:10AM -0800, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 8c67d06f3fd9639c44d8147483fb1c132d71388f
> Author: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Date:   Thu Dec 23 08:23:49 2021 +0000
> 
>     usb: Link the ports to the connectors they are attached to
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14063168700000
> start commit:   555f3d7be91a Merge tag '5.17-rc3-ksmbd-server-fixes' of gi..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=16063168700000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12063168700000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=266de9da75c71a45
> dashboard link: https://syzkaller.appspot.com/bug?extid=60df062e1c41940cae0f
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15880d84700000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14de0c77b00000
> 
> Reported-by: syzbot+60df062e1c41940cae0f@...kaller.appspotmail.com
> Fixes: 8c67d06f3fd9 ("usb: Link the ports to the connectors they are attached to")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

I'm guessing the component_add() is failing in this case. So I guess
we need to consider the component_add() failures fatal in
drivers/usb/core/port.c, which is a bit of a bummer. I'll send the
fix.

-- 
heikki