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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Fri, 4 Jan 2019 11:32:12 +0100
Message-ID: <CACT4Y+aAofhchOpKTjLGGkQb5PAa74Uyp7kowdSoAwt130ZpAg@mail.gmail.com>
Subject: Re: kernel panic: stack is corrupted in udp4_lib_lookup2
To:     Stefano Brivio <sbrivio@redhat.com>
Cc:     Willem de Bruijn <willemdebruijn.kernel@gmail.com>,
        Eric Dumazet <eric.dumazet@gmail.com>,
        syzbot <syzbot+4ad25edc7a33e4ab91e0@syzkaller.appspotmail.com>,
        David Miller <davem@davemloft.net>,
        Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Network Development <netdev@vger.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
        Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
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On Thu, Jan 3, 2019 at 10:54 PM Stefano Brivio <sbrivio@redhat.com> wrote:
>
> On Thu, 3 Jan 2019 15:15:06 -0600
> Willem de Bruijn <willemdebruijn.kernel@gmail.com> wrote:
>
> > syzbot generated stack traces with
> >
> > [  183.517380]  udpv6_err+0x46/0x60
> > [  183.520739]  ? __udp6_lib_err+0x1890/0x1890
> > [  183.525054]  gue6_err_proto_handler+0x199/0x280
>
> Where? I can't find that in any logs linked from the dashboard at
> https://syzkaller.appspot.com/bug?extid=4ad25edc7a33e4ab91e0 :(

Stefano, there are these 4 bugs reported that have similarly looking
reproducers involving udp sockets and that crash modes that looks like
stack corruption/overflow:

https://syzkaller.appspot.com/bug?extid=14005fa30c9a07192934
https://syzkaller.appspot.com/bug?extid=d14090007dc9ba5fa9b7
https://syzkaller.appspot.com/bug?extid=137ed32ec9a6d5b0d5fe
https://syzkaller.appspot.com/bug?id=d5bc3e0c66d200d72216ab343a67c4327e4a3452

Are these the same bug as this?