1 files changed, 35 insertions, 0 deletions
diff --git a/libgo/misc/cgo/testsanitizers/tsan12.go b/libgo/misc/cgo/testsanitizers/tsan12.go
new file mode 100644
index 00000000000..3e767eee1f8
--- /dev/null
+++ b/libgo/misc/cgo/testsanitizers/tsan12.go
@@ -0,0 +1,35 @@
+// Copyright 2017 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 main
+
+// This program hung when run under the C/C++ ThreadSanitizer. TSAN installs a
+// libc interceptor that writes signal handlers to a global variable within the
+// TSAN runtime instead of making a sigaction system call. A bug in
+// syscall.runtime_AfterForkInChild corrupted TSAN's signal forwarding table
+// during calls to (*os/exec.Cmd).Run, causing the parent process to fail to
+// invoke signal handlers.
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"os/signal"
+	"syscall"
+)
+
+import "C"
+
+func main() {
+	ch := make(chan os.Signal)
+	signal.Notify(ch, syscall.SIGUSR1)
+
+	if err := exec.Command("true").Run(); err != nil {
+		fmt.Fprintf(os.Stderr, "Unexpected error from `true`: %v", err)
+		os.Exit(1)
+	}
+
+	syscall.Kill(syscall.Getpid(), syscall.SIGUSR1)
+	<-ch
+}