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Date:   Thu, 20 Aug 2020 11:55:15 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     syzbot <syzbot+cc4c0f394e2611edba66@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        Johannes Berg <johannes@...solutions.net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Leon Romanovsky <leon@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING in __cfg80211_connect_result

On Thu, Aug 20, 2020 at 11:48 AM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> On Wed, Aug 19, 2020 at 8:42 PM syzbot
> <syzbot+cc4c0f394e2611edba66@...kaller.appspotmail.com> wrote:
> >
> > syzbot has bisected this issue to:
> >
> > commit e7096c131e5161fa3b8e52a650d7719d2857adfd
> > Author: Jason A. Donenfeld <Jason@...c4.com>
> > Date:   Sun Dec 8 23:27:34 2019 +0000
> >
> >     net: WireGuard secure network tunnel
> >
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=175ad8b1900000
> > start commit:   e3ec1e8c net: eliminate meaningless memcpy to data in pskb..
> > git tree:       net-next
> > final oops:     https://syzkaller.appspot.com/x/report.txt?x=14dad8b1900000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=10dad8b1900000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=3d400a47d1416652
> > dashboard link: https://syzkaller.appspot.com/bug?extid=cc4c0f394e2611edba66
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15d9de91900000
> >
> > Reported-by: syzbot+cc4c0f394e2611edba66@...kaller.appspotmail.com
> > Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
>
> Having trouble linking this back to wireguard... Those oopses don't
> have anything to do with it either. Bisection error?

I don't see anything obviously wrong in the bisection log:
bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=175ad8b1900000

On the other hand, it looks super precise. It tracked "WARNING in
__cfg80211_connect_result" all the way down to the wireguard commit
with no flakes or anything.

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