add test case for issue #34391

Author: nyuichi

src/runtime/crash_test.go

@@ -143,9 +143,18 @@ func buildTestProg(t *testing.T, binary string, flags ...string) (string, error)
 	return exe, nil
 }
 
-func TestVDSO(t *testing.T) {
+func TestSIGPROFInVDSO(t *testing.T) {
 	t.Parallel()
-	output := runTestProg(t, "testprog", "SignalInVDSO")
+	output := runTestProg(t, "testprog", "SIGPROFInVDSO")
+	want := "success\n"
+	if output != want {
+		t.Fatalf("output:\n%s\n\nwanted:\n%s", output, want)
+	}
+}
+
+func TestSIGUSR1InVDSO(t *testing.T) {
+	t.Parallel()
+	output := runTestProg(t, "testprog", "SIGUSR1InVDSO")
 	want := "success\n"
 	if output != want {
 		t.Fatalf("output:\n%s\n\nwanted:\n%s", output, want)

src/runtime/testdata/testprog/vdso.go

@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Invoke signal hander in the VDSO context (see issue 32912).
+// Invoke signal hander in the VDSO context.
+// See issue 32912 and 34391.
 
 package main
 
@@ -11,14 +12,16 @@ import (
 	"io/ioutil"
 	"os"
 	"runtime/pprof"
+	"syscall"
 	"time"
 )
 
 func init() {
-	register("SignalInVDSO", signalInVDSO)
+	register("SIGPROFInVDSO", signalSIGPROFInVDSO)
+	register("SIGUSR1InVDSO", signalSIGUSR1InVDSO)
 }
 
-func signalInVDSO() {
+func signalSIGPROFInVDSO() {
 	f, err := ioutil.TempFile("", "timeprofnow")
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err)
@@ -53,3 +56,28 @@ func signalInVDSO() {
 
 	fmt.Println("success")
 }
+
+func signalSIGUSR1InVDSO() {
+	done := make(chan struct {})
+
+	p, _ := os.FindProcess(os.Getpid())
+	go func() {
+		for {
+			p.Signal(syscall.SIGUSR1)
+			select {
+			case <- done:
+				return
+			default:
+			}
+		}
+	}()
+
+	t0 := time.Now()
+	t1 := t0
+	for t1.Sub(t0) < time.Second {
+		t1 = time.Now()
+	}
+	close(done)
+
+	fmt.Println("success")
+}