linux-kernel - Re: WARNING in get_pi

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Message-ID: <CACT4Y+ZpkVxdPW6zqO_ngQBun-Op7voonjX4zXR9tiFX50_MRQ@mail.gmail.com>
Date:   Tue, 7 Nov 2017 15:50:58 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     syzbot 
        <bot+2af19c9e1ffe4d4ee1d16c56ae7580feaee75765@...kaller.appspotmail.com>,
        dvhart@...radead.org, LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        syzkaller-bugs@...glegroups.com,
        Thomas Gleixner <tglx@...utronix.de>,
        andreyknvl <andreyknvl@...gle.com>
Subject: Re: WARNING in get_pi_state

On Tue, Oct 31, 2017 at 11:08 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, Oct 31, 2017 at 12:29:50PM +0300, Dmitry Vyukov wrote:
>> I understand your sentiment, but it's definitely not _at all_. The
>> system compiled this exact code, run it and triggered the bug on it.
>> Do you have suggestions on how to make this code more portable? How
>> does this setup would look on your system?
>
> So I don't see the point of that tun stuff; what was is supposed to do?
>
> All it ever did after creation was flush_tun(), which reads until empty.
> But given nobody would ever write into it, that's an 'expensive' NO-OP.

I've filed https://github.com/google/syzkaller/issues/414 for this. If
the program does not use tun, we will strip that code right away.
Thanks for feedback.