2014-09-21 17:33:12 +00:00
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime_test
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import (
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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2015-08-28 15:33:40 +00:00
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"runtime"
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2014-09-21 17:33:12 +00:00
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"strings"
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"testing"
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"text/template"
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)
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// testEnv excludes GODEBUG from the environment
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// to prevent its output from breaking tests that
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// are trying to parse other command output.
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func testEnv(cmd *exec.Cmd) *exec.Cmd {
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if cmd.Env != nil {
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panic("environment already set")
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}
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for _, env := range os.Environ() {
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if strings.HasPrefix(env, "GODEBUG=") {
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continue
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}
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cmd.Env = append(cmd.Env, env)
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}
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return cmd
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}
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2015-08-28 15:33:40 +00:00
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func executeTest(t *testing.T, templ string, data interface{}, extra ...string) string {
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2014-09-21 17:33:12 +00:00
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t.Skip("gccgo does not have a go command")
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2015-08-28 15:33:40 +00:00
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switch runtime.GOOS {
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case "android", "nacl":
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t.Skipf("skipping on %s", runtime.GOOS)
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}
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2014-09-21 17:33:12 +00:00
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checkStaleRuntime(t)
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st := template.Must(template.New("crashSource").Parse(templ))
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dir, err := ioutil.TempDir("", "go-build")
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if err != nil {
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t.Fatalf("failed to create temp directory: %v", err)
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}
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defer os.RemoveAll(dir)
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src := filepath.Join(dir, "main.go")
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f, err := os.Create(src)
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if err != nil {
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t.Fatalf("failed to create file: %v", err)
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}
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err = st.Execute(f, data)
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if err != nil {
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f.Close()
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t.Fatalf("failed to execute template: %v", err)
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}
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if err := f.Close(); err != nil {
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t.Fatalf("failed to close file: %v", err)
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}
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2015-08-28 15:33:40 +00:00
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for i := 0; i < len(extra); i += 2 {
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if err := ioutil.WriteFile(filepath.Join(dir, extra[i]), []byte(extra[i+1]), 0666); err != nil {
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t.Fatal(err)
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}
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}
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cmd := exec.Command("go", "build", "-o", "a.exe")
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cmd.Dir = dir
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out, err := testEnv(cmd).CombinedOutput()
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if err != nil {
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t.Fatalf("building source: %v\n%s", err, out)
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}
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got, _ := testEnv(exec.Command(filepath.Join(dir, "a.exe"))).CombinedOutput()
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2014-09-21 17:33:12 +00:00
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return string(got)
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}
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func checkStaleRuntime(t *testing.T) {
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// 'go run' uses the installed copy of runtime.a, which may be out of date.
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out, err := testEnv(exec.Command("go", "list", "-f", "{{.Stale}}", "runtime")).CombinedOutput()
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if err != nil {
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t.Fatalf("failed to execute 'go list': %v\n%v", err, string(out))
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}
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if string(out) != "false\n" {
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t.Fatalf("Stale runtime.a. Run 'go install runtime'.")
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}
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}
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func testCrashHandler(t *testing.T, cgo bool) {
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type crashTest struct {
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Cgo bool
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}
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output := executeTest(t, crashSource, &crashTest{Cgo: cgo})
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want := "main: recovered done\nnew-thread: recovered done\nsecond-new-thread: recovered done\nmain-again: recovered done\n"
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if output != want {
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t.Fatalf("output:\n%s\n\nwanted:\n%s", output, want)
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}
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}
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func TestCrashHandler(t *testing.T) {
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testCrashHandler(t, false)
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}
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func testDeadlock(t *testing.T, source string) {
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output := executeTest(t, source, nil)
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want := "fatal error: all goroutines are asleep - deadlock!\n"
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if !strings.HasPrefix(output, want) {
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t.Fatalf("output does not start with %q:\n%s", want, output)
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}
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}
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func TestSimpleDeadlock(t *testing.T) {
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testDeadlock(t, simpleDeadlockSource)
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}
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func TestInitDeadlock(t *testing.T) {
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testDeadlock(t, initDeadlockSource)
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}
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func TestLockedDeadlock(t *testing.T) {
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testDeadlock(t, lockedDeadlockSource)
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}
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func TestLockedDeadlock2(t *testing.T) {
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testDeadlock(t, lockedDeadlockSource2)
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}
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func TestGoexitDeadlock(t *testing.T) {
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output := executeTest(t, goexitDeadlockSource, nil)
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want := "no goroutines (main called runtime.Goexit) - deadlock!"
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if !strings.Contains(output, want) {
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t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
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2014-09-21 17:33:12 +00:00
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}
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}
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func TestStackOverflow(t *testing.T) {
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output := executeTest(t, stackOverflowSource, nil)
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want := "runtime: goroutine stack exceeds 4194304-byte limit\nfatal error: stack overflow"
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if !strings.HasPrefix(output, want) {
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t.Fatalf("output does not start with %q:\n%s", want, output)
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}
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}
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func TestThreadExhaustion(t *testing.T) {
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output := executeTest(t, threadExhaustionSource, nil)
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want := "runtime: program exceeds 10-thread limit\nfatal error: thread exhaustion"
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if !strings.HasPrefix(output, want) {
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t.Fatalf("output does not start with %q:\n%s", want, output)
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}
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}
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2015-08-28 15:33:40 +00:00
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func TestRecursivePanic(t *testing.T) {
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output := executeTest(t, recursivePanicSource, nil)
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want := `wrap: bad
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panic: again
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`
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if !strings.HasPrefix(output, want) {
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t.Fatalf("output does not start with %q:\n%s", want, output)
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}
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}
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func TestGoexitCrash(t *testing.T) {
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output := executeTest(t, goexitExitSource, nil)
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want := "no goroutines (main called runtime.Goexit) - deadlock!"
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if !strings.Contains(output, want) {
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t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
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}
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}
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func TestGoexitDefer(t *testing.T) {
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c := make(chan struct{})
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go func() {
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defer func() {
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r := recover()
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if r != nil {
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t.Errorf("non-nil recover during Goexit")
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}
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c <- struct{}{}
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}()
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runtime.Goexit()
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}()
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// Note: if the defer fails to run, we will get a deadlock here
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<-c
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}
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func TestGoNil(t *testing.T) {
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output := executeTest(t, goNilSource, nil)
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want := "go of nil func value"
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if !strings.Contains(output, want) {
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t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
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}
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}
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func TestMainGoroutineId(t *testing.T) {
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output := executeTest(t, mainGoroutineIdSource, nil)
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want := "panic: test\n\ngoroutine 1 [running]:\n"
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if !strings.HasPrefix(output, want) {
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t.Fatalf("output does not start with %q:\n%s", want, output)
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}
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}
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func TestBreakpoint(t *testing.T) {
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output := executeTest(t, breakpointSource, nil)
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want := "runtime.Breakpoint()"
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if !strings.Contains(output, want) {
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t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
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}
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}
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2014-09-21 17:33:12 +00:00
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const crashSource = `
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package main
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import (
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"fmt"
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"runtime"
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)
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{{if .Cgo}}
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import "C"
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{{end}}
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func test(name string) {
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defer func() {
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if x := recover(); x != nil {
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fmt.Printf(" recovered")
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}
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fmt.Printf(" done\n")
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}()
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fmt.Printf("%s:", name)
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var s *string
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_ = *s
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fmt.Print("SHOULD NOT BE HERE")
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}
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func testInNewThread(name string) {
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c := make(chan bool)
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go func() {
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runtime.LockOSThread()
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test(name)
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c <- true
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}()
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<-c
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}
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func main() {
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runtime.LockOSThread()
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test("main")
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testInNewThread("new-thread")
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testInNewThread("second-new-thread")
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test("main-again")
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}
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`
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const simpleDeadlockSource = `
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package main
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func main() {
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select {}
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}
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`
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const initDeadlockSource = `
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package main
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func init() {
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select {}
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}
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func main() {
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}
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`
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const lockedDeadlockSource = `
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package main
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import "runtime"
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func main() {
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runtime.LockOSThread()
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select {}
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}
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`
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const lockedDeadlockSource2 = `
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package main
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import (
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"runtime"
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"time"
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)
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func main() {
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go func() {
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runtime.LockOSThread()
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select {}
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}()
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time.Sleep(time.Millisecond)
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select {}
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}
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`
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const goexitDeadlockSource = `
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package main
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import (
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"runtime"
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)
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func F() {
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for i := 0; i < 10; i++ {
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}
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}
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func main() {
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go F()
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go F()
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runtime.Goexit()
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}
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`
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const stackOverflowSource = `
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package main
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import "runtime/debug"
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func main() {
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debug.SetMaxStack(4<<20)
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f(make([]byte, 10))
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}
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func f(x []byte) byte {
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var buf [64<<10]byte
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return x[0] + f(buf[:])
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}
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`
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const threadExhaustionSource = `
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package main
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import (
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"runtime"
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"runtime/debug"
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)
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func main() {
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debug.SetMaxThreads(10)
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c := make(chan int)
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for i := 0; i < 100; i++ {
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go func() {
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runtime.LockOSThread()
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c <- 0
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select{}
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}()
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<-c
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}
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}
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`
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2015-08-28 15:33:40 +00:00
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const recursivePanicSource = `
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package main
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import (
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"fmt"
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)
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func main() {
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func() {
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defer func() {
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fmt.Println(recover())
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}()
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var x [8192]byte
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func(x [8192]byte) {
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defer func() {
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if err := recover(); err != nil {
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panic("wrap: " + err.(string))
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}
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}()
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panic("bad")
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}(x)
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}()
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panic("again")
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}
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`
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const goexitExitSource = `
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package main
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import (
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"runtime"
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"time"
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)
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func main() {
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go func() {
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time.Sleep(time.Millisecond)
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}()
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i := 0
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runtime.SetFinalizer(&i, func(p *int) {})
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runtime.GC()
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runtime.Goexit()
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}
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`
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const goNilSource = `
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package main
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func main() {
|
|
|
|
defer func() {
|
|
|
|
recover()
|
|
|
|
}()
|
|
|
|
var f func()
|
|
|
|
go f()
|
|
|
|
select{}
|
|
|
|
}
|
|
|
|
`
|
|
|
|
|
|
|
|
const mainGoroutineIdSource = `
|
|
|
|
package main
|
|
|
|
func main() {
|
|
|
|
panic("test")
|
|
|
|
}
|
|
|
|
`
|
|
|
|
|
|
|
|
const breakpointSource = `
|
|
|
|
package main
|
|
|
|
import "runtime"
|
|
|
|
func main() {
|
|
|
|
runtime.Breakpoint()
|
|
|
|
}
|
|
|
|
`
|
|
|
|
|
|
|
|
func TestGoexitInPanic(t *testing.T) {
|
|
|
|
// see issue 8774: this code used to trigger an infinite recursion
|
|
|
|
output := executeTest(t, goexitInPanicSource, nil)
|
|
|
|
want := "fatal error: no goroutines (main called runtime.Goexit) - deadlock!"
|
|
|
|
if !strings.HasPrefix(output, want) {
|
|
|
|
t.Fatalf("output does not start with %q:\n%s", want, output)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
const goexitInPanicSource = `
|
|
|
|
package main
|
|
|
|
import "runtime"
|
|
|
|
func main() {
|
|
|
|
go func() {
|
|
|
|
defer func() {
|
|
|
|
runtime.Goexit()
|
|
|
|
}()
|
|
|
|
panic("hello")
|
|
|
|
}()
|
|
|
|
runtime.Goexit()
|
|
|
|
}
|
|
|
|
`
|
|
|
|
|
|
|
|
func TestPanicAfterGoexit(t *testing.T) {
|
|
|
|
// an uncaught panic should still work after goexit
|
|
|
|
output := executeTest(t, panicAfterGoexitSource, nil)
|
|
|
|
want := "panic: hello"
|
|
|
|
if !strings.HasPrefix(output, want) {
|
|
|
|
t.Fatalf("output does not start with %q:\n%s", want, output)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
const panicAfterGoexitSource = `
|
|
|
|
package main
|
|
|
|
import "runtime"
|
|
|
|
func main() {
|
|
|
|
defer func() {
|
|
|
|
panic("hello")
|
|
|
|
}()
|
|
|
|
runtime.Goexit()
|
|
|
|
}
|
|
|
|
`
|
|
|
|
|
|
|
|
func TestRecoveredPanicAfterGoexit(t *testing.T) {
|
|
|
|
output := executeTest(t, recoveredPanicAfterGoexitSource, nil)
|
|
|
|
want := "fatal error: no goroutines (main called runtime.Goexit) - deadlock!"
|
|
|
|
if !strings.HasPrefix(output, want) {
|
|
|
|
t.Fatalf("output does not start with %q:\n%s", want, output)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
const recoveredPanicAfterGoexitSource = `
|
|
|
|
package main
|
|
|
|
import "runtime"
|
|
|
|
func main() {
|
|
|
|
defer func() {
|
|
|
|
defer func() {
|
|
|
|
r := recover()
|
|
|
|
if r == nil {
|
|
|
|
panic("bad recover")
|
|
|
|
}
|
|
|
|
}()
|
|
|
|
panic("hello")
|
|
|
|
}()
|
|
|
|
runtime.Goexit()
|
|
|
|
}
|
|
|
|
`
|
|
|
|
|
|
|
|
func TestRecoverBeforePanicAfterGoexit(t *testing.T) {
|
|
|
|
// 1. defer a function that recovers
|
|
|
|
// 2. defer a function that panics
|
|
|
|
// 3. call goexit
|
|
|
|
// Goexit should run the #2 defer. Its panic
|
|
|
|
// should be caught by the #1 defer, and execution
|
|
|
|
// should resume in the caller. Like the Goexit
|
|
|
|
// never happened!
|
|
|
|
defer func() {
|
|
|
|
r := recover()
|
|
|
|
if r == nil {
|
|
|
|
panic("bad recover")
|
|
|
|
}
|
|
|
|
}()
|
|
|
|
defer func() {
|
|
|
|
panic("hello")
|
|
|
|
}()
|
|
|
|
runtime.Goexit()
|
|
|
|
}
|