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plugin: Open with cgo panics: runtime: no plugin module data #37286

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spellr opened this issue Feb 18, 2020 · 2 comments
Closed

plugin: Open with cgo panics: runtime: no plugin module data #37286

spellr opened this issue Feb 18, 2020 · 2 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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@spellr
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spellr commented Feb 18, 2020

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

$ go version
go version go1.13.8 linux/amd64

Does this issue reproduce with the latest release?

Yes.

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

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/speller/.cache/go-build"
GOENV="/home/speller/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/speller/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/opt/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/opt/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build530246739=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Using cgo, I run go code from my C++ code, and the go code loads a plugin.
This results in a panic.

cbridge.go:

package main

import (
	"C"
	"fmt"
	"plugin"
)

func main() {
	LoadPlugin("/tmp/plugin.so")
}

//export LoadPlugin
func LoadPlugin(path string) {
    fmt.Println("In cbridge.go ", path)
    _, _ = plugin.Open(path)
}

plugin.go:

package main

import "fmt"

func main() {
	fmt.Println("In plugin!")
}

In my c++ code:

std::string plugin("/tmp/plugin.so");
LoadPlugin(GoString{plugin.c_str(), static_cast<ptrdiff_t>(plugin.size())});

Running cbridge.go directly works, so it's code is fine.
Running it through the C++ code using cgo results in this crash:

In cbridge.go /tmp/plugin.so
fatal error: runtime: no plugin module data

goroutine 17 [running, locked to thread]:
runtime.throw(0x55df236ade9b, 0x1e)
	GOROOT/src/runtime/panic.go:774 +0x74 fp=0xc0000548e0 sp=0xc0000548b0 pc=0x55df20e5ab24
plugin.lastmoduleinit(0xc00009ac00, 0x1001, 0x1001, 0xc0000b2020, 0x55df27259e00)
	GOROOT/src/runtime/plugin.go:20 +0xb31 fp=0xc000054a00 sp=0xc0000548e0 pc=0x55df20e5bef1
plugin.open(0x7f480257e950, 0xb, 0x5e4c0a83, 0x28a2b168, 0x1c0bf56d57c1)
	GOROOT/src/plugin/plugin_dlopen.go:77 +0x517 fp=0xc000054c90 sp=0xc000054a00 pc=0x55df210d8847
plugin.Open(0x7f480257e950, 0xe, 0x55df25aaaee0, 0xf, 0x0)
	GOROOT/src/plugin/plugin.go:32 +0x37 fp=0xc000054cc8 sp=0xc000054c90 pc=0x55df210d7f57
main.LoadPlugin(0x7f480257e950, 0xe)
	cbridge.go:17 +0x125 fp=0xc000054e20 sp=0xc000054cc8 pc=0x55df210d9995
main._cgoexpwrap_181dbf39f508_LoadPlugin(0x7f480257e950, 0xe)
	_cgo_gotypes.go:51 +0x37 fp=0xc000054e40 sp=0xc000054e20 pc=0x55df210d9777
runtime.call32(0x0, 0x7f480257e840, 0x7f480257e900, 0x10)
	src/runtime/asm_amd64.s:539 +0x3d fp=0xc000054e70 sp=0xc000054e40 pc=0x55df20e8628d
runtime.cgocallbackg1(0x0)
	GOROOT/src/runtime/cgocall.go:314 +0x1bb fp=0xc000054f58 sp=0xc000054e70 pc=0x55df20e3036b
runtime.cgocallbackg(0x0)
	GOROOT/src/runtime/cgocall.go:191 +0xc7 fp=0xc000054fc0 sp=0xc000054f58 pc=0x55df20e30117
runtime.cgocallback_gofunc(0x0, 0x0, 0x0, 0x0)
	src/runtime/asm_amd64.s:793 +0x9a fp=0xc000054fe0 sp=0xc000054fc0 pc=0x55df20e8789a
runtime.goexit()
	src/runtime/asm_amd64.s:1357 +0x1 fp=0xc000054fe8 sp=0xc000054fe0 pc=0x55df20e87ff1
@toothrot toothrot changed the title plugin.Open with cgo panics plugin: Open with cgo panics Feb 18, 2020
@toothrot toothrot added this to the Backlog milestone Feb 18, 2020
@toothrot toothrot changed the title plugin: Open with cgo panics plugin: Open with cgo panics: runtime: no plugin module data Feb 18, 2020
@toothrot toothrot added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Feb 18, 2020
@toothrot
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/cc @ianlancetaylor @cherrymui

@spellr This could be a duplicate of #33072

@spellr
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spellr commented Feb 18, 2020

@toothrot seems like it is.
I'll close, thanks

@spellr spellr closed this as completed Feb 18, 2020
@golang golang locked and limited conversation to collaborators Feb 17, 2021
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