1 files changed, 71 insertions, 0 deletions
diff --git a/test/fixedbugs/issue32477.go b/test/fixedbugs/issue32477.go
new file mode 100644
index 0000000..8b3c175
--- /dev/null
+++ b/test/fixedbugs/issue32477.go
@@ -0,0 +1,71 @@
+// run
+
+// 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.
+
+// Make sure we use the deferreturn live map instead of
+// the entry live map when handling a segv in a function
+// that defers.
+
+package main
+
+import "runtime"
+
+var finalized bool
+var err string
+
+type HeapObj [8]int64
+
+const filler int64 = 0x123456789abcdef0
+
+func (h *HeapObj) init() {
+	for i := 0; i < len(*h); i++ {
+		h[i] = filler
+	}
+}
+func (h *HeapObj) check() {
+	for i := 0; i < len(*h); i++ {
+		if h[i] != filler {
+			err = "filler overwritten"
+		}
+	}
+}
+
+func gc(shouldFinalize bool) {
+	runtime.GC()
+	runtime.GC()
+	runtime.GC()
+	if shouldFinalize != finalized {
+		err = "heap object finalized at the wrong time"
+	}
+}
+
+func main() {
+	h := new(HeapObj)
+	h.init()
+	runtime.SetFinalizer(h, func(h *HeapObj) {
+		finalized = true
+	})
+
+	gc(false)
+	g(h)
+	if err != "" {
+		panic(err)
+	}
+}
+
+func g(h *HeapObj) {
+	gc(false)
+	h.check()
+	// h is now unused
+	defer func() {
+		// h should not be live here. Previously we used to
+		// use the function entry point as the place to get
+		// the live map when handling a segv.
+		gc(true)
+		recover()
+	}()
+	*(*int)(nil) = 0 // trigger a segv
+	return
+}