Re: Linux 4.4.34

[Andre Noll <maan@xxxxxxxxxxxxxxxx>]

On Tue, Nov 22, 09:56, Eric Dumazet wrote
> >> @@ -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().
> >
> 
> What compiler are you using exactly ?

gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3, as shipped with
Ubuntu-12.04. I've also tried gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3)
4.8.4 from Ubuntu-14.04. No difference.

> diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
> index 69e4463a4b1b..48791f372aa2 100644
> --- a/net/core/flow_dissector.c
> +++ b/net/core/flow_dissector.c
> @@ -551,6 +551,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
> 
>         key_control->thoff = (u16)nhoff;
>  out:
> +       barrier();
>         key_basic->n_proto = proto;
>         key_basic->ip_proto = ip_proto;

No luck: Still the same panic.

Andre
-- 
Max Planck Institute for Developmental Biology
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http://people.tuebingen.mpg.de/maan/

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