Date: Tue, 22 Nov 2016 18:38:56 +0100
From: Andre Noll <maan@tuebingen.mpg.de>
To: Eric Dumazet <edumazet@google.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
        LKML <linux-kernel@vger.kernel.org>, stable@vger.kernel.org,
        Jiri Slaby <jslaby@suse.cz>, Yibin Yang <yibyang@cisco.com>,
        Alexander Duyck <alexander.h.duyck@intel.com>,
        Willem de Bruijn <willemb@google.com>,
        Alexei Starovoitov <ast@kernel.org>,
        "David S. Miller" <davem@davemloft.net>
Subject: Re: Linux 4.4.34
Message-ID: <20161122173856.GC19939@tuebingen.mpg.de>
References: <20161121092855.GA20976@kroah.com>
 <20161122165912.GA19939@tuebingen.mpg.de>
 <20161122170654.GA20022@kroah.com>
 <CANn89iJCkHxOpE3TW8+gW8+UCVvT0mY8y8j_GJC1GK0i05dgbg@mail.gmail.com>
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On Tue, Nov 22, 09:14, Eric Dumazet wrote
> We definitely want to fix the real bug, not working around it.
>=20
> Seems an aliasing problem, key_control and key_basic might point to
> adjacent memory
> and a barrier() would solve the issue as well.

This was also my first idea. I added some printk statements
which confirmed that key_basic->n_proto, key_basic->ip_proto and
key_control->thoff were indeed close to each other. They did not
overlap though.

Hope this helps
Andre
--=20
Max Planck Institute for Developmental Biology
Spemannstra=C3=9Fe 35, 72076 T=C3=BCbingen, Germany. Phone: (+49) 7071 601 =
829
http://people.tuebingen.mpg.de/maan/

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