[signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0x50631bb]

[rcrick]

Hi @MordFustang21 I'm developing a qrcode detect api, when I do stress test, some time the it will panic at two line
one is panic at s := C.zbar_image_first_symbol(i.image),
the other one is at below

func (s *Symbol) Each(f func(string)) {
	t := s
       // some time t is nil
	for {
		f(t.Data())

		t = t.Next()

		if t == nil {
			break
		}
	}
}

here is my test code

package main

import (
	"bytes"
	"fmt"
	"github.com/MordFustang21/gozbar"
	"image"
	_ "image/gif"
	_ "image/jpeg"
	_ "image/png"
	"io/ioutil"
	"sync"
)

func main() {
	var wg sync.WaitGroup
	wg.Add(2000)
	for i :=0; i < 2000; i++ {
		go func() {
			defer wg.Done()
			b, err := ioutil.ReadFile("img.png")
			if err != nil {
				panic(err)
			}
			img, _, err := image.Decode(bytes.NewReader(b))
			if err != nil {
				panic(err)
			}

			barcodeImg := gozbar.FromImage(img)
			scanner := gozbar.NewScanner()
			scanner.SetConfig(gozbar.NONE, gozbar.CFG_ENABLE, 1)

			err = scanner.Scan(barcodeImg)
			if err != nil {
				panic(err)
			}

			defer scanner.Destroy()
	
			barcodeImg.First().Each(func(str string) {
				fmt.Println(str)
			})

		}()
	}
	wg.Wait()

}

here is the image

Do you have any suggestion?

[MordFustang21]

Sorry for the late reply and I'm sure you've already found an alternative solution. I forked this from another library and haven't really looked super closely at how this would work in multiple goroutines. My guess is there's likely a race condition in there that needs to be addressed.