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If the NET_TCPBACKLOG configuration is not enabled, no I/O event will be triggered for the socket file descriptor in poll/epoll. As a result, the connection will not be accepted, leading to a failure in the TCP handshake. The problem is that users may not have noticed this configuration, no event will be received when polling the socket fd. Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>