Please answer these questions before submitting your issue. Thanks!

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

go version go1.10.3 darwin/amd64

Does this issue reproduce with the latest release?

yes

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

GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/yishengyang/Library/Caches/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/yishengyang//go"
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/vh/6m51srdn3ps28tc64qy1343h0000gp/T/go-build869355597=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

package main

import (
	"log"
)

type dummy struct {}


func (d dummy)GenByte() []byte  {
	log.Println("From plugin GenByte")
	data:=[]byte{1,2,3,4,5}
	return data
}

func (d dummy)PrintByte(data []byte)  {
	log.Println("From plugin PrintByte")
	log.Println(data)
}

var Endpoint dummy


func main() {
	
}

package main

import (
	"plugin"
	"log"
)

type T interface {
	GenByte() []byte
	PrintByte(data []byte)
}

func main()  {
	plgin, err := plugin.Open("./plugin.so")
	if err != nil {
		panic(err)
	}
	symbol, err:= plgin.Lookup("Endpoint")
	if err != nil {
		panic(err)
	}
	b, ok := symbol.(T)
	if !ok{
		panic("Type assertion fail")
	}
	log.Println("From main")
	for{
		data := b.GenByte()
		b.PrintByte(data)
	}


}

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.

build the second code segment with buildmode =plugin and load it in the first segment

What did you expect to see?

no error

What did you see instead?

2018/07/18 16:47:51 From plugin GenByte
2018/07/18 16:47:51 From plugin PrintByte
2018/07/18 16:47:51 [1 2 3 4 5]
.......
After a couple of iterations
runtime: bad pointer in frame plugin/unnamed-8b1a52c90a93f94ad1c14cee47dc41ef6a9bc487.dummy.PrintByte at 0xc420055eb0: 0x5
fatal error: invalid pointer found on stack

I don't know it is go or it is me. Basically I need to pass a byte array to a plugin function. How can I achieve this?