linux-kernel - Re: [syzbot] WARNING in do_proc_control/usb_submit

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Date:   Thu, 15 Jul 2021 09:19:06 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Johan Hovold <johan@...nel.org>,
        syzbot <syzbot+72af3105289dcb4c055b@...kaller.appspotmail.com>,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, mathias.nyman@...ux.intel.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in do_proc_control/usb_submit_urb

On Mon, 12 Jul 2021 at 20:48, Alan Stern <stern@...land.harvard.edu> wrote:
>
> On Mon, Jul 12, 2021 at 06:24:43PM +0200, Dmitry Vyukov wrote:
> > On Mon, 12 Jul 2021 at 18:14, Alan Stern <stern@...land.harvard.edu> wrote:
>
> > > > It looks like the second patch you submitted was hand-edited and still
> > > > quoted.
> > > >
> > > > And looking at the dashboard it seems like no patch was applied for your
> > > > second test attempt:
> > > >
> > > >       https://syzkaller.appspot.com/bug?extid=72af3105289dcb4c055b
> > >
> > > Yes, that explains it.  Funny how easy it is to miss those "> "
> > > markings -- you just get too used to them.
> > >
> > > > I've been bitten by something like this before when erroneously thinking
> > > > that a test command could be submitted as a reply to a patch.
> > > >
> > > > Perhaps the report mail could include the patch tested or something so
> > > > we don't spend time investigating syzbot interface failures.
> > >
> > > Good idea.
> >
> > The email always include the patch tested (as syzbot parsed it), see
> > e.g. earlier reply in this thread:
> > https://lore.kernel.org/lkml/00000000000074f06705c6ccd2a4@google.com/
>
> The email doesn't include the patch; it includes a _link_ to the patch.
>
> And the email does not contain any indication when no patch was parsed,
> other than the missing "patch:" link -- which is not particularly
> obvious if you aren't looking for it specifically:
>
>         https://marc.info/?l=linux-usb&m=162602190812912&w=2

I've filed https://github.com/google/syzkaller/issues/2668 for
explicitly saying that there was no patch.

Using links instead of attachments is intentional, initially syzbot
attached lots of things to emails and lots of users complained about
huge emails. So now all additional info goes via links.


> > > Anyway, here's the patch again, this time properly formatted.  Hopefully
> > > now it will work.
> >
> > syzbot parsed this patch successfully:
> > https://syzkaller.appspot.com/bug?extid=72af3105289dcb4c055b
>
> Yes, and it worked.  Time to submit it.
>
> Alan Stern