diff --git a/src/cmd/gc/range.c b/src/cmd/gc/range.c
index 8af45b9d274..bd271da386b 100644
--- a/src/cmd/gc/range.c
+++ b/src/cmd/gc/range.c
@@ -129,6 +129,9 @@ walkrange(Node *n)
 	v2 = N;
 	if(n->list->next)
 		v2 = n->list->next->n;
+	// n->list has no meaning anymore, clear it
+	// to avoid erroneous processing by racewalk.
+	n->list = nil;
 	hv2 = N;
 
 	if(v2 == N && t->etype == TARRAY) {
diff --git a/src/pkg/runtime/race/testdata/mop_test.go b/src/pkg/runtime/race/testdata/mop_test.go
index fa7abe0ef83..6d30989193e 100644
--- a/src/pkg/runtime/race/testdata/mop_test.go
+++ b/src/pkg/runtime/race/testdata/mop_test.go
@@ -267,6 +267,19 @@ func TestNoRaceRange(t *testing.T) {
 	close(ch)
 }
 
+func TestNoRaceRangeIssue5446(t *testing.T) {
+	ch := make(chan int, 3)
+	a := []int{1, 2, 3}
+	b := []int{4}
+	// used to insert a spurious instrumentation of a[i]
+	// and crash.
+	i := 1
+	for i, a[i] = range b {
+		ch <- i
+	}
+	close(ch)
+}
+
 func TestRaceRange(t *testing.T) {
 	const N = 2
 	var a [N]int