Crash if using import "C" in main file

i'm trying to use your library in my project, and want to wrap it for my project with go layer that exports dll file, and in this case im getting null pointer in runtime

step to reproduce:

1. use Windows arm64
2. import "C" in main file
3. start sing-box instance
4. runtime crashes with no error

sing-box config: { "log": { "level": "warning", "timestamp": true }, "dns": { "servers": [ { "tag": "remote", "address": "8.8.8.8", "detour": "proxy" } ], "final": "remote" }, "inbounds": [ { "type": "tun", "tag": "tun-in", "interface_name": "singbox_tun", "address": [ "172.19.0.1/30" ], "mtu": 9000, "auto_route": true, "strict_route": false, "stack": "gvisor", "sniff": true } ], "outbounds": [ { "type": "socks", "tag": "proxy", "server": "127.0.0.1", "server_port": 10808, "version": "5" }, { "type": "direct", "tag": "direct" }, { "type": "dns", "tag": "dns_out" } ], "route": { "auto_detect_interface": true, "rules": [ { "outbound": "direct", "ip_is_private": true }, { "outbound": "dns_out", "port": [ 53 ], "process_name": [ "xray.exe", "cracker.exe" ] }, { "outbound": "direct", "process_name": [ "xray.exe", "cracker.exe" ] }, { "outbound": "proxy", "network": "tcp,udp" } ] } }

Wrapper package that calls from main

import (
	"context"
	"fmt"
	"os"
	"os/user"
	"strconv"

	"github.com/sagernet/sing-box/experimental/deprecated"
	"github.com/sagernet/sing-box/include"
	"github.com/sagernet/sing-box/log"
	"github.com/sagernet/sing-box/option"
	"github.com/sagernet/sing/common/json"
	"github.com/sagernet/sing/service"
	"github.com/sagernet/sing/service/filemanager"

	box "github.com/sagernet/sing-box"
)

var (
	globalCtx context.Context
)

type SingBox struct {
	tun *box.Box
}

func New(configJson string) (*SingBox, error) {
	configBytes := []byte(configJson)
	options, err := json.UnmarshalExtendedContext[option.Options](globalCtx, configBytes)
	if err != nil {
		return nil, fmt.Errorf("Error while parse options from config json : ", err.Error())
	}
	ctx, cancel := context.WithCancel(globalCtx)
	instance, err := box.New(box.Options{
		Context: ctx,
		Options: options,
	})
	if err != nil {
		cancel()
		return nil, fmt.Errorf("Error while creating sing box instance : ", err.Error())
	}
	return &SingBox{
		tun: instance,
	}, nil
}

func (s *SingBox) Run() error {
	err := s.tun.Start()
	if err != nil {
		return fmt.Errorf("Error while starting sing box : ", err)
	}
	return nil
}

func (s *SingBox) Stop() error {
	err := s.tun.Close()
	if err != nil {
		return fmt.Errorf("Error while stoping sing box : ", err)
	}
	return nil
}

func init() {
	globalCtx = context.Background()
	sudoUser := os.Getenv("SUDO_USER")
	sudoUID, _ := strconv.Atoi(os.Getenv("SUDO_UID"))
	sudoGID, _ := strconv.Atoi(os.Getenv("SUDO_GID"))
	if sudoUID == 0 && sudoGID == 0 && sudoUser != "" {
		sudoUserObject, _ := user.Lookup(sudoUser)
		if sudoUserObject != nil {
			sudoUID, _ = strconv.Atoi(sudoUserObject.Uid)
			sudoGID, _ = strconv.Atoi(sudoUserObject.Gid)
		}
	}
	if sudoUID > 0 && sudoGID > 0 {
		globalCtx = filemanager.WithDefault(globalCtx, "", "", sudoUID, sudoGID)
	}

	globalCtx = service.ContextWith(globalCtx, deprecated.NewStderrManager(log.StdLogger()))
	globalCtx = box.Context(globalCtx, include.InboundRegistry(), include.OutboundRegistry(), include.EndpointRegistry())
}```

i need to use it as library for KMM project, i'm not expirenced in go and cgo. thanks for answer in advance

Reproduce the crash on Windows arm64 using the reported configuration and wrapper package, focusing on the import "C" change in the main file and the New and Run entry points. Compare execution with and without cgo and capture the runtime failure; done means identifying the cause and adding a regression test or documented fix for the crashing setup.