1 files changed, 42 insertions, 0 deletions
diff --git a/src/encoding/gob/type_test.go b/src/encoding/gob/type_test.go
index 14f25d8ac4..934270eedd 100644
--- a/src/encoding/gob/type_test.go
+++ b/src/encoding/gob/type_test.go
@@ -7,6 +7,7 @@ package gob
 import (
 	"bytes"
 	"reflect"
+	"sync"
 	"testing"
 )
 
@@ -218,3 +219,44 @@ func TestStressParallel(t *testing.T) {
 		<-c
 	}
 }
+
+// Issue 23328. Note that this test name is known to cmd/dist/test.go.
+func TestTypeRace(t *testing.T) {
+	c := make(chan bool)
+	var wg sync.WaitGroup
+	for i := 0; i < 2; i++ {
+		wg.Add(1)
+		go func(i int) {
+			defer wg.Done()
+			var buf bytes.Buffer
+			enc := NewEncoder(&buf)
+			dec := NewDecoder(&buf)
+			var x interface{}
+			switch i {
+			case 0:
+				x = &N1{}
+			case 1:
+				x = &N2{}
+			default:
+				t.Errorf("bad i %d", i)
+				return
+			}
+			m := make(map[string]string)
+			<-c
+			if err := enc.Encode(x); err != nil {
+				t.Error(err)
+				return
+			}
+			if err := enc.Encode(x); err != nil {
+				t.Error(err)
+				return
+			}
+			if err := dec.Decode(&m); err == nil {
+				t.Error("decode unexpectedly succeeded")
+				return
+			}
+		}(i)
+	}
+	close(c)
+	wg.Wait()
+}