Subject: Re: Suspicious RCU usage in bridge with Linux v4.0-9362-g1fc149933fd4

From: Dominick Grift <[email-masked]>
Date: Tue, 12 May 2015 20:27:42 +0200

On Mon, May 11, 2015 at 07:53:06AM -0700, Eric Dumazet wrote:
> 
> Hi Dominick
> 
> Have you tried this patch I sent last monday ?
> 
> I will submit formally when I get a test result.
> 
> Thanks

Eric,

I have tested the below patch and everything is in order!

Thank you!

> 
> diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c
> index 4fcaa67750fda845ad0a180332c4cd96a9524086..7caf7fae2d5b8aa369b924e1c87a47c343fb8954 100644
> --- a/net/bridge/br_stp_timer.c
> +++ b/net/bridge/br_stp_timer.c
> @@ -97,7 +97,9 @@ static void br_forward_delay_timer_expired(unsigned long arg)
>  		netif_carrier_on(br->dev);
>  	}
>  	br_log_state(p);
> +	rcu_read_lock();
>  	br_ifinfo_notify(RTM_NEWLINK, p);
> +	rcu_read_unlock();
>  	spin_unlock(&br->lock);
>  }
>  
> 
> 

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Dominick Grift