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net: cannot send UDP packet in windows 11 #52883

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Ovi3 opened this issue May 13, 2022 · 4 comments
Closed

net: cannot send UDP packet in windows 11 #52883

Ovi3 opened this issue May 13, 2022 · 4 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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Backlog

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@Ovi3
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Ovi3 commented May 13, 2022 •
edited

What version of Go are you using (go version)?

$ go version
go version go1.17.7 windows/amd64

Does this issue reproduce with the latest release?

Not try

(I only reproduce this issue on my company client. Cannot bother him for more info)

What operating system and processor architecture are you using (winver)?

winver Output
$ winver
Windows OS 11 Version 21H2 (Build 22000.613)

What did you do?

package main

import (
	"net"
)

func main() {
	conn,err := net.DialUDP("udp",nil, &net.UDPAddr{
		IP: net.IPv4(8,8,8,8),
		Port: 9090,
	})

	if err != nil {
		panic(err)
	}

	_,err = conn.Write([]byte("udp test"))
	if err != nil {
		panic(err)
	}

	conn.Close()
}

open wireshark and run this code, there is no udp packet to 8.8.8.8:9090, and no panic error

but when I add code that reading from udp connection. It work:

package main

import (
	"net"
	"time"
)

func main() {
	conn,err := net.DialUDP("udp",nil, &net.UDPAddr{
		IP: net.IPv4(8,8,8,8),
		Port: 9090,
	})

	if err != nil {
		panic(err)
	}

	_,err = conn.Write([]byte("udp test"))
	if err != nil {
		panic(err)
	}

	conn.SetReadDeadline(time.Now().Add(1 * time.Second))
	buf := make([]byte,1024)
	_, _, _ = conn.ReadFromUDP(buf)

	conn.Close()
}

I also use Python, It work too:

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.sendto(b"test", ('8.8.8.8', 9090))

So I think maybe it's not windows 11 problem.
@heschi
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heschi commented May 13, 2022

cc @ianlancetaylor @neild

@heschi heschi added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label May 13, 2022
@heschi heschi added this to the Backlog milestone May 13, 2022
@neild
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neild commented May 13, 2022

Is is possible the packet is making it into a send buffer that isn't flushed when the program exits?

What happens if you insert a select{} after the write (causing the program to block indefinitely without exiting) instead of reading from the conn?

@Ovi3
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Ovi3 commented May 20, 2022

I add select{} after the write (or add time.Sleep(3 * time.Second)) , It works.

package main

import (
	"net"
)

func main() {
	conn,err := net.DialUDP("udp",nil, &net.UDPAddr{
		IP: net.IPv4(8,8,8,8),
		Port: 9090,
	})

	if err != nil {
		panic(err)
	}

	_,err = conn.Write([]byte("udp test"))
	if err != nil {
		panic(err)
	}

        select{}

	conn.Close()
}

@seankhliao
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Closing as this seems to be working

@seankhliao seankhliao closed this as not planned Won't fix, can't repro, duplicate, stale Jul 29, 2022
@golang golang locked and limited conversation to collaborators Jul 29, 2023
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