netdev - Re: PROBLEM: Linux kernel 2.6.31 IPv4 TCP fails to open huge amount of outgoing connections (unable to bind ... )

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Date:	Sun, 25 Apr 2010 19:56:00 +0400
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Ben Greear <greearb@...delatech.com>,
	David Miller <davem@...emloft.net>,
	Gaspar Chilingarov <gasparch@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: PROBLEM: Linux kernel 2.6.31 IPv4 TCP fails to open huge amount of outgoing connections (unable to bind ... )

On Sun, Apr 25, 2010 at 05:26:42PM +0300, Michael S. Tsirkin (mst@...hat.com) wrote:

> > diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
> > index 0c5e3c3..fb6959c 100644
> > --- a/net/ipv6/inet6_connection_sock.c
> > +++ b/net/ipv6/inet6_connection_sock.c
> > @@ -42,11 +42,16 @@ int inet6_csk_bind_conflict(const struct sock *sk,
> >  		if (sk != sk2 &&
> >  		    (!sk->sk_bound_dev_if ||
> >  		     !sk2->sk_bound_dev_if ||
> > -		     sk->sk_bound_dev_if == sk2->sk_bound_dev_if) &&
> > -		    (!sk->sk_reuse || !sk2->sk_reuse ||
> > -		     sk2->sk_state == TCP_LISTEN) &&
> > -		     ipv6_rcv_saddr_equal(sk, sk2))
> > -			break;
> > +		     sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
> > +			if ((!sk->sk_reuse || !sk2->sk_reuse ||
> > +			     sk2->sk_state == TCP_LISTEN) &&
> > +			     ipv6_rcv_saddr_equal(sk, sk2))
> > +				break;
> > +			else if (sk->sk_reuse && sk2->sk_reuse &&
> > +				!ipv6_addr_any(inet6_rcv_saddr(sk2)) &&

I suppose above line is guilty when inet6_rcv_saddr() returns NULL?

-- 
	Evgeniy Polyakov
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