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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime_test
import (
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"testing"
"text/template"
)
// testEnv excludes GODEBUG from the environment
// to prevent its output from breaking tests that
// are trying to parse other command output.
func testEnv(cmd *exec.Cmd) *exec.Cmd {
if cmd.Env != nil {
panic("environment already set")
}
for _, env := range os.Environ() {
if strings.HasPrefix(env, "GODEBUG=") {
continue
}
cmd.Env = append(cmd.Env, env)
}
return cmd
}
func executeTest(t *testing.T, templ string, data interface{}) string {
checkStaleRuntime(t)
st := template.Must(template.New("crashSource").Parse(templ))
dir, err := ioutil.TempDir("", "go-build")
if err != nil {
t.Fatalf("failed to create temp directory: %v", err)
}
defer os.RemoveAll(dir)
src := filepath.Join(dir, "main.go")
f, err := os.Create(src)
if err != nil {
t.Fatalf("failed to create file: %v", err)
}
err = st.Execute(f, data)
if err != nil {
f.Close()
t.Fatalf("failed to execute template: %v", err)
}
if err := f.Close(); err != nil {
t.Fatalf("failed to close file: %v", err)
}
got, _ := testEnv(exec.Command("go", "run", src)).CombinedOutput()
return string(got)
}
func checkStaleRuntime(t *testing.T) {
// 'go run' uses the installed copy of runtime.a, which may be out of date.
out, err := testEnv(exec.Command("go", "list", "-f", "{{.Stale}}", "runtime")).CombinedOutput()
if err != nil {
t.Fatalf("failed to execute 'go list': %v\n%v", err, string(out))
}
if string(out) != "false\n" {
t.Fatalf("Stale runtime.a. Run 'go install runtime'.")
}
}
func testCrashHandler(t *testing.T, cgo bool) {
type crashTest struct {
Cgo bool
}
output := executeTest(t, crashSource, &crashTest{Cgo: cgo})
want := "main: recovered done\nnew-thread: recovered done\nsecond-new-thread: recovered done\nmain-again: recovered done\n"
if output != want {
t.Fatalf("output:\n%s\n\nwanted:\n%s", output, want)
}
}
func TestCrashHandler(t *testing.T) {
testCrashHandler(t, false)
}
func testDeadlock(t *testing.T, source string) {
output := executeTest(t, source, nil)
want := "fatal error: all goroutines are asleep - deadlock!\n"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestSimpleDeadlock(t *testing.T) {
testDeadlock(t, simpleDeadlockSource)
}
func TestInitDeadlock(t *testing.T) {
testDeadlock(t, initDeadlockSource)
}
func TestLockedDeadlock(t *testing.T) {
testDeadlock(t, lockedDeadlockSource)
}
func TestLockedDeadlock2(t *testing.T) {
testDeadlock(t, lockedDeadlockSource2)
}
func TestGoexitDeadlock(t *testing.T) {
output := executeTest(t, goexitDeadlockSource, nil)
if output != "" {
t.Fatalf("expected no output, got:\n%s", output)
}
}
func TestStackOverflow(t *testing.T) {
output := executeTest(t, stackOverflowSource, nil)
want := "runtime: goroutine stack exceeds 4194304-byte limit\nfatal error: stack overflow"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestThreadExhaustion(t *testing.T) {
output := executeTest(t, threadExhaustionSource, nil)
want := "runtime: program exceeds 10-thread limit\nfatal error: thread exhaustion"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
const crashSource = `
package main
import (
"fmt"
"runtime"
)
{{if .Cgo}}
import "C"
{{end}}
func test(name string) {
defer func() {
if x := recover(); x != nil {
fmt.Printf(" recovered")
}
fmt.Printf(" done\n")
}()
fmt.Printf("%s:", name)
var s *string
_ = *s
fmt.Print("SHOULD NOT BE HERE")
}
func testInNewThread(name string) {
c := make(chan bool)
go func() {
runtime.LockOSThread()
test(name)
c <- true
}()
<-c
}
func main() {
runtime.LockOSThread()
test("main")
testInNewThread("new-thread")
testInNewThread("second-new-thread")
test("main-again")
}
`
const simpleDeadlockSource = `
package main
func main() {
select {}
}
`
const initDeadlockSource = `
package main
func init() {
select {}
}
func main() {
}
`
const lockedDeadlockSource = `
package main
import "runtime"
func main() {
runtime.LockOSThread()
select {}
}
`
const lockedDeadlockSource2 = `
package main
import (
"runtime"
"time"
)
func main() {
go func() {
runtime.LockOSThread()
select {}
}()
time.Sleep(time.Millisecond)
select {}
}
`
const goexitDeadlockSource = `
package main
import (
"runtime"
)
func F() {
for i := 0; i < 10; i++ {
}
}
func main() {
go F()
go F()
runtime.Goexit()
}
`
const stackOverflowSource = `
package main
import "runtime/debug"
func main() {
debug.SetMaxStack(4<<20)
f(make([]byte, 10))
}
func f(x []byte) byte {
var buf [64<<10]byte
return x[0] + f(buf[:])
}
`
const threadExhaustionSource = `
package main
import (
"runtime"
"runtime/debug"
)
func main() {
debug.SetMaxThreads(10)
c := make(chan int)
for i := 0; i < 100; i++ {
go func() {
runtime.LockOSThread()
c <- 0
select{}
}()
<-c
}
}
`
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