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-rw-r--r--test/fixedbugs/issue21576.go63
1 files changed, 63 insertions, 0 deletions
diff --git a/test/fixedbugs/issue21576.go b/test/fixedbugs/issue21576.go
new file mode 100644
index 0000000..3f9b1ba
--- /dev/null
+++ b/test/fixedbugs/issue21576.go
@@ -0,0 +1,63 @@
+// run
+
+// +build !nacl,!js,!gccgo
+
+// Copyright 2019 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.
+//
+// Ensure that deadlock detection can still
+// run even with an import of "_ os/signal".
+
+package main
+
+import (
+ "bytes"
+ "context"
+ "io/ioutil"
+ "log"
+ "os"
+ "os/exec"
+ "path/filepath"
+ "time"
+)
+
+const prog = `
+package main
+
+import _ "os/signal"
+
+func main() {
+ c := make(chan int)
+ c <- 1
+}
+`
+
+func main() {
+ dir, err := ioutil.TempDir("", "21576")
+ if err != nil {
+ log.Fatal(err)
+ }
+ defer os.RemoveAll(dir)
+
+ file := filepath.Join(dir, "main.go")
+ if err := ioutil.WriteFile(file, []byte(prog), 0655); err != nil {
+ log.Fatalf("Write error %v", err)
+ }
+
+ // Using a timeout of 1 minute in case other factors might slow
+ // down the start of "go run". See https://golang.org/issue/34836.
+ ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+ defer cancel()
+
+ cmd := exec.CommandContext(ctx, "go", "run", file)
+ output, err := cmd.CombinedOutput()
+ if err == nil {
+ log.Fatalf("Passed, expected an error")
+ }
+
+ want := []byte("fatal error: all goroutines are asleep - deadlock!")
+ if !bytes.Contains(output, want) {
+ log.Fatalf("Unmatched error message %q:\nin\n%s\nError: %v", want, output, err)
+ }
+}