1 files changed, 62 insertions, 0 deletions
diff --git a/test/fixedbugs/issue20780b.go b/test/fixedbugs/issue20780b.go
new file mode 100644
index 0000000..c8bf1f8
--- /dev/null
+++ b/test/fixedbugs/issue20780b.go
@@ -0,0 +1,62 @@
+// +build cgo,linux,amd64
+// run -race
+
+// Copyright 2021 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.
+
+// Test that CL 281293 doesn't interfere with race detector
+// instrumentation.
+
+package main
+
+import "fmt"
+
+const N = 2e6
+
+type Big = [N]int
+
+var sink interface{}
+
+func main() {
+	g(0, f(0))
+
+	x1 := f(1)
+	sink = &x1
+	g(1, x1)
+	g(7, f(7))
+	g(1, x1)
+
+	x3 := f(3)
+	sink = &x3
+	g(1, x1)
+	g(3, x3)
+
+	h(f(0), x1, f(2), x3, f(4))
+}
+
+//go:noinline
+func f(k int) (x Big) {
+	for i := range x {
+		x[i] = k*N + i
+	}
+	return
+}
+
+//go:noinline
+func g(k int, x Big) {
+	for i := range x {
+		if x[i] != k*N+i {
+			panic(fmt.Sprintf("x%d[%d] = %d", k, i, x[i]))
+		}
+	}
+}
+
+//go:noinline
+func h(x0, x1, x2, x3, x4 Big) {
+	g(0, x0)
+	g(1, x1)
+	g(2, x2)
+	g(3, x3)
+	g(4, x4)
+}