Re: Hang in 2.6.23-rc5

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On Mon, 3 Sep 2007, Alexey Dobriyan wrote:
> 
> Try this from net-2.6 tree:
> 
> --- a/net/ipv4/tcp_input.c
> +++ b/net/ipv4/tcp_input.c
> @@ -560,7 +560,7 @@ static u32 tcp_rto_min(struct sock *sk)
>  	struct dst_entry *dst = __sk_dst_get(sk);
>  	u32 rto_min = TCP_RTO_MIN;
>  
> -	if (dst_metric_locked(dst, RTAX_RTO_MIN))
> +	if (dst && dst_metric_locked(dst, RTAX_RTO_MIN))
>  		rto_min = dst->metrics[RTAX_RTO_MIN-1];
>  	return rto_min;
>  }

That's my impression as well. That's way too core/busy a codepath to have
a bug in. As I said earlier, almost anybody testing -rc5 is sure to hit
this within a few hours (probably less) -- sad, it greatly erodes from the
usefulness of -rc5 as a release candidate.
-
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