linux-kernel - Re: [PATCH v2] tcp: fix connection reset due to tw hashdance race.

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Message-ID: <B4FF81C421E3D77D+65165cda-6331-4a05-b7b5-b7173cfdbd55@uniontech.com>
Date: Tue, 15 Jul 2025 15:21:05 +0800
From: Gou Hao <gouhao@...ontech.com>
To: kuniyu@...zon.com
Cc: davem@...emloft.net, dsahern@...nel.org, duanmuquan@...du.com,
 edumazet@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, pabeni@...hat.com, jiazhenyuan@...ontech.com,
 goutongchen@...ontech.com
Subject: Re: [PATCH v2] tcp: fix connection reset due to tw hashdance race.

Could you please tell me how this issue was ultimately resolved? I don't 
see any related patches in mainline.

We encountered the same situation in our actual business: due to lookup 
failure, the client received RST packets.

As follows:

    CPU 0                                       CPU 1
    -----                                             -----
tcp_v4_rcv()                      syn_recv_sock()
                                             inet_ehash_insert()
                                             -> 
sk_nulls_del_node_init_rcu(osk)
__inet_lookup_established()
                                             -> 
__sk_nulls_add_node_rcu(sk, list)

--

thanks,

Gou Hao