1 files changed, 62 insertions, 0 deletions
diff --git a/test/fixedbugs/issue27695.go b/test/fixedbugs/issue27695.go
new file mode 100644
index 0000000..8bd4939
--- /dev/null
+++ b/test/fixedbugs/issue27695.go
@@ -0,0 +1,62 @@
+// run
+
+// Copyright 2018 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.
+
+// Make sure return values are always scanned, when
+// calling methods (+functions, TODO) with reflect.
+
+package main
+
+import (
+	"reflect"
+	"runtime/debug"
+	"sync"
+)
+
+func main() {
+	debug.SetGCPercent(1) // run GC frequently
+	var wg sync.WaitGroup
+	for i := 0; i < 20; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for i := 0; i < 2000; i++ {
+				_test()
+			}
+		}()
+	}
+	wg.Wait()
+}
+
+type Stt struct {
+	Data interface{}
+}
+
+type My struct {
+	b byte
+}
+
+func (this *My) Run(rawData []byte) (Stt, error) {
+	var data string = "hello"
+	stt := Stt{
+		Data: data,
+	}
+	return stt, nil
+}
+
+func _test() (interface{}, error) {
+	f := reflect.ValueOf(&My{}).MethodByName("Run")
+	if method, ok := f.Interface().(func([]byte) (Stt, error)); ok {
+		s, e := method(nil)
+		// The bug in issue27695 happens here, during the return
+		// from the above call (at the end of reflect.callMethod
+		// when preparing to return). The result value that
+		// is assigned to s was not being scanned if GC happens
+		// to occur there.
+		i := interface{}(s)
+		return i, e
+	}
+	return nil, nil
+}