diff --git a/src/cmd/compile/internal/ssa/prove.go b/src/cmd/compile/internal/ssa/prove.go
index 7c69327..960db67 100644
--- a/src/cmd/compile/internal/ssa/prove.go
+++ b/src/cmd/compile/internal/ssa/prove.go
@@ -1015,6 +1015,11 @@
 	//
 	// If all of these conditions are true, then i1 < max and i1 >= min.
 
+	// To ensure this is a loop header node.
+	if len(b.Preds) != 2 {
+		return
+	}
+
 	for _, i1 := range b.Values {
 		if i1.Op != OpPhi {
 			continue
@@ -1056,6 +1061,9 @@
 				}
 				br = negative
 			}
+			if br == unknown {
+				continue
+			}
 
 			tr, has := domainRelationTable[pred.Control.Op]
 			if !has {
diff --git a/test/fixedbugs/issue40367.go b/test/fixedbugs/issue40367.go
new file mode 100644
index 0000000..0dc5ad7
--- /dev/null
+++ b/test/fixedbugs/issue40367.go
@@ -0,0 +1,41 @@
+// run
+
+// Copyright 2020 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.
+
+package main
+
+func case1() {
+	rates := []int32{1,2,3,4,5,6}
+	var sink [6]int
+	j := len(sink)
+	for star, _ := range rates {
+		if star+1 < 1 {
+			panic("")
+		}
+		j--
+		sink[j] = j
+	}
+}
+
+func case2() {
+	i := 0
+	var sink [3]int
+	j := len(sink)
+top:
+	j--
+	sink[j] = j
+	if i < 2 {
+		i++
+		if i < 1 {
+			return
+		}
+		goto top
+	}
+}
+
+func main() {
+	case1()
+	case2()
+}
\ No newline at end of file
diff --git a/test/prove.go b/test/prove.go
index f6dd9f0..fc14396 100644
--- a/test/prove.go
+++ b/test/prove.go
@@ -670,7 +670,8 @@
 	i := 0
 	if len(b) > i {
 	top:
-		println(b[i]) // ERROR "Induction variable: limits \[0,\?\), increment 1$" "Proved IsInBounds$"
+		// TODO: remove the todo of next line once we complete the following optimization of CL 244579
+		// println(b[i]) // todo: ERROR "Induction variable: limits \[0,\?\), increment 1$" "Proved IsInBounds$"
 		i++
 		if i < len(b) {
 			goto top
@@ -696,7 +697,8 @@
 // range2 elements are larger, so they use the general form of a range loop.
 func range2(b [][32]int) {
 	for i, v := range b {
-		b[i][0] = v[0] + 1 // ERROR "Induction variable: limits \[0,\?\), increment 1$" "Proved IsInBounds$"
+		// TODO: remove the todo of next line once we complete the following optimization of CL 244579
+		b[i][0] = v[0] + 1 // todo: ERROR "Induction variable: limits \[0,\?\), increment 1$" "Proved IsInBounds$"
 		if i < len(b) {    // ERROR "Proved Less64$"
 			println("x")
 		}