cmd/link : slice bounds out of range

[fishedee]

Please answer these questions before submitting your issue. Thanks!

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

fish@iZ2820y71jjZ:~$ go version
go version go1.6.1 linux/amd64

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

fish@iZ2820y71jjZ:~$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/fish/Project/fishgo"
GORACE=""
GOROOT="/home/fish/Util/go"
GOTOOLDIR="/home/fish/Util/go/pkg/tool/linux_amd64"
GO15VENDOREXPERIMENT="1"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0"
CXX="g++"
CGO_ENABLED="1"

1. What did you do?
   If possible, provide a recipe for reproducing the error.
   A complete runnable program is good.
   A link on play.golang.org is best.

//$GOPATH/src/gotest/util/util.go
package util

import (
    "github.com/go-xorm/xorm"
)


type Ctx struct{
    DB *xorm.Engine
}

type MM struct{
    Ctx
}

I write a util/util.go

//$GOPATH/src/gotest/util2/util2.go
package util2

import (
        "gotest/util"
        "github.com/go-xorm/xorm"
)

var a *xorm.Engine

type MX struct{
        util.MM
}

func Doing(){
        a := MX{}
        a.DB.NewSession()
}

I write a util2/util2.go

go install -buildmode=shared -linkshared github.com/go-xorm/xorm
go install -buildmode=shared -linkshared gotest/util
go install -buildmode=shared -linkshared gotest/util2

And cmd/link crash!!

2016/05/03 12:32:03 [build.go:62][E] build fail! error: # /tmp/go-build964506236/libmymanager-models-common.so
panic: runtime error: slice bounds out of range

goroutine 1 [running]:
panic(0x6374c0, 0xc820010100)
    /usr/local/go/src/runtime/panic.go:464 +0x3e6
cmd/link/internal/ld.decodetype_ptrdata(0xc82010f680, 0x7f17530e3000)
    /usr/local/go/src/cmd/link/internal/ld/decodesym.go:75 +0x8b
cmd/link/internal/ld.(*GCProg).AddSym(0xc822b89040, 0xc82010f7a0)
    /usr/local/go/src/cmd/link/internal/ld/data.go:1094 +0x1ec
cmd/link/internal/ld.dodata()
    /usr/local/go/src/cmd/link/internal/ld/data.go:1386 +0x1847
cmd/link/internal/ld.Ldmain()
    /usr/local/go/src/cmd/link/internal/ld/pobj.go:244 +0x1f42
cmd/link/internal/amd64.Main()
    /usr/local/go/src/cmd/link/internal/amd64/obj.go:44 +0x19
main.main()
    /usr/local/go/src/cmd/link/main.go:27 +0x36f

Crash StackTrace

1. What did you expect to see?

NoCrash

1. What did you see instead?

Crash

[fishedee]

I just try again,it would also crash in go1.6.2

[fishedee]

//$GOPATH/src/gotest/util2/util2.go
package util2

import (
        "gotest/util"

        //"github.com/go-xorm/xorm"
)

//remove this line
//var a *xorm.Engine

type MX struct{
        util.MM
}

func Doing(){
        a := MX{}
        a.DB.NewSession()
}

If i remove "var a *xorm.Engine"this line
it will complaint me

fish@iZ2820y71jjZ:~/Project/fishgo/pkg$ go install -buildmode=shared -linkshared gotest2/util2
# /tmp/go-build787415985/libgotest2-util2.so
gotest2/util2.Doing: github.com/go-xorm/xorm.(*Engine).NewSession: not defined
gotest2/util2.Doing: undefined: github.com/go-xorm/xorm.(*Engine).NewSession

But go install is ok，maybe shared mode can't handle nested struct import

[mwhudson]

Thanks for the report, I'll look at this tomorrow.

[gopherbot]

CL https://golang.org/cl/22744 mentions this issue.