}

func CrashDumpsAllThreads() {
	const count = 4
	runtime.GOMAXPROCS(count + 1)

	chans := make([]chan bool, count)
	for i := range chans {
		chans[i] = make(chan bool)
		go crashDumpsAllThreadsLoop(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.

	// "goroutine running on other thread; stack unavailable".
	out := outbuf.Bytes()
	n := bytes.Count(out, []byte("main.crashDumpsAllThreadsLoop("))
	if n != 4 {
		t.Errorf("found %d instances of main.crashDumpsAllThreadsLoop; expected 4", n)
		t.Logf("%s", out)
	}
}

func TestPanicSystemstack(t *testing.T) {
	// Test that GOTRACEBACK=crash prints both the system and user