Please answer these questions before submitting your issue. Thanks!

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

go version go1.9.1 linux/amd64

Does this issue reproduce with the latest release?

Yes, I'm using the latest release

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

GOHOSTARCH="amd64"
GOHOSTOS="linux"

What did you do?

I use a plugin whose name has dots inside. The program that uses this plugin crashes when a function from the plugin is called. The problem disappears if I rename the plugin (e.g. remove dots) and recompile everything.

To reproduce, one needs to do the following:

1. create "plugin_error/plugin_error.go" with the following contents:

package main

import (
	"plugin"
)

func main() {
	plugin_handler, err := plugin.Open("plugin/p.l.u.g.i.n.so")

	if err != nil {
		panic("Cannot open plugin: " + err.Error())
	}

	plugin_entry_symb, err := plugin_handler.Lookup("Plugin_entry")

	if err != nil {
		panic("Cannot find symbol: " + err.Error())
	}

	plugin_entry := plugin_entry_symb.(func())

	plugin_entry()
}

2. create "plugin_error/vendor/another_package/another_package.go" with the following contents:

package another_package

import "fmt"

func init() {
	fmt.Println("CAN YOU SEE THIS MESSAGE?")
}

func FormalFunction() {
	fmt.Println("Formal message")
}

3. create "plugin_error/p.l.u.g.i.n/p.l.u.g.i.n.go" with the following contents:

package main

import (
	"another_package"
)

func Plugin_entry() {
	another_package.FormalFunction()
}

4. go to "plugin_error/p.l.u.g.i.n/p.l.u.g.i.n.go" and run "go build -buildmode=plugin"
5. create a directory called "plugin_error/plugin"
6. copy the compiled plugin to this directory
7. build "plugin_error" package
8. ./plugin_error

What did you expect to see?

For the code above, I expect to see:

CAN YOU SEE THIS MESSAGE?
Formal message

What did you see instead?

A program crash