linux-kernel - Re: WARNING in snd_usbmidi_submit_urb/usb_submit

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Date:   Tue, 2 Jun 2020 19:19:27 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     syzbot <syzbot+5f1d24c49c1d2c427497@...kaller.appspotmail.com>,
        Felipe Balbi <balbi@...nel.org>, ingrassia@...genesys.com,
        LKML <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING in snd_usbmidi_submit_urb/usb_submit_urb

On Mon, Jun 1, 2020 at 2:29 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Mon, Jun 01, 2020 at 02:22:40PM +0200, Andrey Konovalov wrote:
> > On Mon, Jun 1, 2020 at 10:43 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> > >
> > > On Mon, Jun 01, 2020 at 12:24:03AM -0700, syzbot wrote:
> > > > syzbot has bisected this bug to:
> > > >
> > > > commit f2c2e717642c66f7fe7e5dd69b2e8ff5849f4d10
> > > > Author: Andrey Konovalov <andreyknvl@...gle.com>
> > > > Date:   Mon Feb 24 16:13:03 2020 +0000
> > > >
> > > >     usb: gadget: add raw-gadget interface
> > > >
> > > > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=164afcf2100000
> > > > start commit:   bdc48fa1 checkpatch/coding-style: deprecate 80-column warn..
> > > > git tree:       upstream
> > > > final crash:    https://syzkaller.appspot.com/x/report.txt?x=154afcf2100000
> > > > console output: https://syzkaller.appspot.com/x/log.txt?x=114afcf2100000
> > > > kernel config:  https://syzkaller.appspot.com/x/.config?x=129ea1e5950835e5
> > > > dashboard link: https://syzkaller.appspot.com/bug?extid=5f1d24c49c1d2c427497
> > > > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12d70cf2100000
> > > >
> > > > Reported-by: syzbot+5f1d24c49c1d2c427497@...kaller.appspotmail.com
> > > > Fixes: f2c2e717642c ("usb: gadget: add raw-gadget interface")
> > > >
> > > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> > >
> > > So the tool that was used to create the bug has bisected the problem to
> > > the patch that adds the tool to the kernel to test for the issue?
> > >
> > > This feels wrong...
> >
> > That's the expected result of bisection with the way it's intended to
> > work. We'll be getting more bisection results pointing to that commit
> > for old USB bugs. For new ones (that are introduced after raw-gadget),
> > the bisection should point to proper commits.
>
> Ok, can you then mute any bisection emails that are about to get sent
> out that resolve to this commit to save us the effort of just ignoring
> the thing on our end?

Sent syzbot change: https://github.com/google/syzkaller/pull/1782