linux-kernel - Re: Linux 4.4.34

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Date:   Tue, 22 Nov 2016 18:55:04 +0100
From:   Andre Noll <maan@...bingen.mpg.de>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     "Duyck, Alexander H" <alexander.h.duyck@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "willemb@...gle.com" <willemb@...gle.com>,
        "jslaby@...e.cz" <jslaby@...e.cz>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "yibyang@...co.com" <yibyang@...co.com>
Subject: Re: Linux 4.4.34

On Tue, Nov 22, 09:46, Eric Dumazet wrote
> This is an aliasing problem.
> Tom code is hard to read and understand.
> 
> Andre, could you try :
> 
> diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
> index 69e4463a4b1b..b045980faaea 100644
> --- a/net/core/flow_dissector.c
> +++ b/net/core/flow_dissector.c
> @@ -157,6 +157,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
>                 memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
>         }
> 
> +       barrier();
>  again:
>         switch (proto) {
>         case htons(ETH_P_IP): {

This patch on top of v4.4.34 makes no difference: I'm still getting
the panic in eth_type_trans().

Andre
-- 
Max Planck Institute for Developmental Biology
Spemannstraße 35, 72076 Tübingen, Germany. Phone: (+49) 7071 601 829
http://people.tuebingen.mpg.de/maan/

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