Re: [PATCH bpf-next 1/2] bpf, sockmap: Fix udp_bpf_recvmsg() spinning on backlog-only ingress

[Alexei Starovoitov]

On Tue, Sep 29, 2026 at 04:34 PM chenyuan_fl@xxxxxxx <chenyuan_fl@xxxxxxx> wrote:
> @@ -91,7 +91,7 @@ static int udp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
>  		timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
>  		data = udp_msg_wait_data(sk, psock, timeo);
>  		if (data) {
> -			if (psock_has_data(psock))
> +			if (!sk_psock_queue_empty(psock))
>  				goto msg_bytes_ready;
>
>  			release_sock(sk);

sashiko is right. This replaces a spin with a hang.

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