Re: [RT PATCH 1/2] net: add back the missing serialization in ip_send_unicast_reply()

On 2016-08-31 12:15:53 [-0400], Steven Rostedt wrote:

quoted

@@ -689,10 +691,13 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
 		     offsetof(struct inet_timewait_sock, tw_bound_dev_if));
 
 	arg.tos = ip_hdr(skb)->tos;
+
+	local_lock(tcp_sk_lock);

Interesting that I noticed in mainline, they have:

	local_bh_disable();

here.

I'm surprised we don't have a local_lock_bh() or something to that
effect.

Turning local_bh_disable() into local_lock_bh(). One side effect would
be that the network driver will be flushed out / waited for completion
during socket write (due to the spin_lock_bh()). Not sure how much fun
all this will bring.
We could try this…

-- Steve

Sebastian