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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.
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package runtime_test
import (
"bytes"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"syscall"
"testing"
)
func TestCrashDumpsAllThreads(t *testing.T) {
switch runtime.GOOS {
case "darwin", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris":
default:
t.Skipf("skipping; not supported on %v", runtime.GOOS)
}
// We don't use executeTest because we need to kill the
// program while it is running.
testenv.MustHaveGoBuild(t)
checkStaleRuntime(t)
dir, err := ioutil.TempDir("", "go-build")
if err != nil {
t.Fatalf("failed to create temp directory: %v", err)
}
defer os.RemoveAll(dir)
if err := ioutil.WriteFile(filepath.Join(dir, "main.go"), []byte(crashDumpsAllThreadsSource), 0666); err != nil {
t.Fatalf("failed to create Go file: %v", err)
}
cmd := exec.Command("go", "build", "-o", "a.exe")
cmd.Dir = dir
out, err := testEnv(cmd).CombinedOutput()
if err != nil {
t.Fatalf("building source: %v\n%s", err, out)
}
cmd = exec.Command(filepath.Join(dir, "a.exe"))
cmd = testEnv(cmd)
cmd.Env = append(cmd.Env, "GOTRACEBACK=crash")
var outbuf bytes.Buffer
cmd.Stdout = &outbuf
cmd.Stderr = &outbuf
rp, wp, err := os.Pipe()
if err != nil {
t.Fatal(err)
}
cmd.ExtraFiles = []*os.File{wp}
if err := cmd.Start(); err != nil {
t.Fatalf("starting program: %v", err)
}
if err := wp.Close(); err != nil {
t.Logf("closing write pipe: %v", err)
}
if _, err := rp.Read(make([]byte, 1)); err != nil {
t.Fatalf("reading from pipe: %v", err)
}
if err := cmd.Process.Signal(syscall.SIGQUIT); err != nil {
t.Fatalf("signal: %v", err)
}
// No point in checking the error return from Wait--we expect
// it to fail.
cmd.Wait()
// We want to see a stack trace for each thread.
// Before https://golang.org/cl/2811 running threads would say
// "goroutine running on other thread; stack unavailable".
out = outbuf.Bytes()
n := bytes.Count(out, []byte("main.loop("))
if n != 4 {
t.Errorf("found %d instances of main.loop; expected 4", n)
t.Logf("%s", out)
}
}
const crashDumpsAllThreadsSource = `
package main
import (
"fmt"
"os"
"runtime"
)
func main() {
const count = 4
runtime.GOMAXPROCS(count + 1)
chans := make([]chan bool, count)
for i := range chans {
chans[i] = make(chan bool)
go loop(i, chans[i])
}
// Wait for all the goroutines to start executing.
for _, c := range chans {
<-c
}
// Tell our parent that all the goroutines are executing.
if _, err := os.NewFile(3, "pipe").WriteString("x"); err != nil {
fmt.Fprintf(os.Stderr, "write to pipe failed: %v\n", err)
os.Exit(2)
}
select {}
}
func loop(i int, c chan bool) {
close(c)
for {
for j := 0; j < 0x7fffffff; j++ {
}
}
}
`
|
