Test case for golang nuklear crash

README.md

This is a stripped-down test case for a crash I encountered in the go bindings for nuklear.

To reproduce:

1. Compile: go build nk-go-crash.go
2. Run: ./nk-go-crash
3. Focus the text box in the window.
4. Type 123456789. It should crash sometime around 7 or 8.

Tested with Ubuntu 16.04.4, go version go1.9.4 linux/amd64.

nk-go-crash.go

package main

import (
	"runtime"
	"time"

	"github.com/go-gl/gl/v3.2-core/gl"
	"github.com/go-gl/glfw/v3.2/glfw"
	"github.com/golang-ui/nuklear/nk"
)

const (
	winWidth  = 400
	winHeight = 500

	maxVertexBuffer  = 512 * 1024
	maxElementBuffer = 128 * 1024
)

func init() {
	runtime.LockOSThread()
}

var ibuf = []byte{0}
var shouldFocus = true

func main() {
	if err := glfw.Init(); err != nil {
		panic(err)
	}
	glfw.WindowHint(glfw.ContextVersionMajor, 3)
	glfw.WindowHint(glfw.ContextVersionMinor, 2)
	glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
	glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
	win, err := glfw.CreateWindow(winWidth, winHeight, "Nuklear Demo", nil, nil)
	if err != nil {panic(err)}
	win.MakeContextCurrent()

	if err := gl.Init(); err != nil {
		panic("opengl: init failed")
	}

	ctx := nk.NkPlatformInit(win, nk.PlatformInstallCallbacks)

	atlas := nk.NewFontAtlas()
	nk.NkFontStashBegin(&atlas)
	sansFont := nk.NkFontAtlasAddDefault(atlas, 16, nil)
	nk.NkFontStashEnd()
	nk.NkStyleSetFont(ctx, sansFont.Handle())

	fpsTicker := time.NewTicker(time.Second / 30)
	for {
		<-fpsTicker.C
		glfw.PollEvents()
		gfxMain(win, ctx)
	}
}

func gfxMain(win *glfw.Window, ctx *nk.Context) {
	nk.NkPlatformNewFrame()

	// Layout
	width, height := win.GetSize()
	bounds := nk.NkRect(0, 0, 400, 500)
	update := nk.NkBegin(ctx, "Demo", bounds, 0)

	if update > 0 {
		nk.NkLayoutRowDynamic(ctx, 36, 1)
		nk.NkEditStringZeroTerminated(ctx, nk.EditField, ibuf, 256, nil)
	}
	nk.NkEnd(ctx)

	// Render
	gl.Viewport(0, 0, int32(width), int32(height))
	gl.Clear(gl.COLOR_BUFFER_BIT)
	nk.NkPlatformRender(nk.AntiAliasingOn, maxVertexBuffer, maxElementBuffer)
	win.SwapBuffers()
}

traceback.txt

fatal error: cgoUse should not be called

goroutine 1 [running, locked to thread]:
runtime.throw(0x5d02c0, 0x1b)
        /usr/local/go/src/runtime/panic.go:605 +0x95 fp=0xc420053d70 sp=0xc420053d50 pc=0x4589c5
runtime.cgoUse(0x574b00, 0x1dd8e30)
        /usr/local/go/src/runtime/cgo.go:45 +0x36 fp=0xc420053d90 sp=0xc420053d70 pc=0x431f26
github.com/golang-ui/nuklear/nk._Cfunc_nk_edit_string_zero_terminated(0x1dd8e30, 0x260, 0x8b80cf, 0x100, 0x0, 0x1)
        github.com/golang-ui/nuklear/nk/_obj/_cgo_gotypes.go:3555 +0x7c fp=0xc420053dd0 sp=0xc420053d90 pc=0x4f419c
github.com/golang-ui/nuklear/nk.NkEditStringZeroTerminated.func1(0x1dd8e30, 0x260, 0x8b80cf, 0xc400000100, 0x0, 0x1dd8e30)
        /go/src/github.com/golang-ui/nuklear/nk/nk.go:1695 +0x88 fp=0xc420053e10 sp=0xc420053dd0 pc=0x4fac48
github.com/golang-ui/nuklear/nk.NkEditStringZeroTerminated(0x1dd8e30, 0x100000260, 0x8b80cf, 0x1, 0x1, 0x100, 0x0, 0x0)
        /go/src/github.com/golang-ui/nuklear/nk/nk.go:1695 +0x6f fp=0xc420053e58 sp=0xc420053e10 pc=0x4f999f
main.gfxMain(0xc420086000, 0x1dd8e30)
        /go/main.go:69 +0x1b8 fp=0xc420053eb8 sp=0xc420053e58 pc=0x5088e8
main.main()
        /go/main.go:55 +0x290 fp=0xc420053f80 sp=0xc420053eb8 pc=0x5086c0
runtime.main()
        /usr/local/go/src/runtime/proc.go:195 +0x226 fp=0xc420053fe0 sp=0xc420053f80 pc=0x45a0b6
runtime.goexit()
        /usr/local/go/src/runtime/asm_amd64.s:2337 +0x1 fp=0xc420053fe8 sp=0xc420053fe0 pc=0x482ce1