plugin: loading plugin leads to 'fatal error: invalid runtime symbol table' with some stdlib packages #18190
Description
Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (go version)?
$ go version
go version go1.8beta1 darwin/amd64What operating system and processor architecture are you using (go env)?
$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/mccolljr/Documents/dev/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.8beta1/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.8beta1/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/rg/pwv319qj009dkq19ryb8x3m00000gn/T/go-build046386885=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
What did you do?
pg.go
attempted builds (same error for each):
go build --buildmode=plugin pg.go
go build --gcflags "-dynlink" --buildmode=plugin pg.go
package main
import (
"log"
"net/http"
"html/template"
)
var Handler http.Handler
func init() {
Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
p, err := template.ParseFiles("x.tpl")
if err != nil {
log.Fatalln(err)
}
p.ExecuteTemplate(w, "x.tpl", nil)
})
}x.tpl
TEST!
main.go
attempted builds (same error for each):
go build main.go && ./main
go build --gcflags "-dynlink" main.go && ./main
package main
import (
"fmt"
"net/http"
"plugin"
)
func main() {
p, err := plugin.Open("pg.so")
if err != nil {
panic(err)
}
sym, err := p.Lookup("Handler")
if err != nil {
panic(err)
}
fmt.Println("starting...")
http.ListenAndServe(":8080", *(sym.(*http.Handler)))
}note
This program works correctly when you change pg.go to:
package main
import (
"fmt"
"net/http"
)
var Handler http.Handler
func init() {
Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, "TEST!")
})
}What did you expect to see?
terminal:
$ ./main
starting...
browser:
TEST!
What did you see instead?
runtime: invalid pc-encoded table f=gE#?? pc=0x40d92c1 targetpc=0x53dde9d tab=[0/0]0x0
value=-1 until pc=0x40d9290
value=0 until pc=0x40d9290
value=0 until pc=0x40d9290
value=228 until pc=0x40d92c1
value=230 until pc=0x40d92c1
fatal error: invalid runtime symbol table
runtime stack:
invalid spdelta r; runtime.sizeclass int32; runtime.large bool } 0x405b9c0 0x5329fe5 0x3f3b4 -1
r; runtime.sizeclass int32; runtime.large bool }(0x100, 0x7fff5fbfef9800, 0x534336700)
?:0 +0x12ce625
goroutine 1 [copystack]:
invalid spdelta gE#?? 0x40d9290 0x53dde9d 0x78c52 -1
gE#??(0xc4200ce64000, 0xa00, 0xa00, 0xc42006ed9800, 0xc420014db000)
?:0 +0x1304c0d fp=0xc420137b6f sp=0xc420137b68
goroutine 17 [syscall, locked to thread]:
runtime.goexit()
/usr/local/Cellar/go/1.8beta1/libexec/src/runtime/asm_amd64.s:2184 +0x1
exit status 2