diff --git a/mempool/mempool_test.go b/mempool/mempool_test.go
index b9f641cf..6ad6072b 100644
--- a/mempool/mempool_test.go
+++ b/mempool/mempool_test.go
@@ -74,3 +74,47 @@ func TestAlignedMemPool(t *testing.T) {
 		}
 	}
 }
+
+func TestTraceDebugerPool(t *testing.T) {
+	pool := NewTraceDebuger(New(1, 1))
+	// for i := 0; i < 1024*1024; i++ {
+	// 	buf := pool.Malloc(i)
+	// 	if len(buf) != i {
+	// 		t.Fatalf("invalid len: %v != %v", len(buf), i)
+	// 	}
+	// 	pool.Free(buf)
+	// }
+	// for i := 1024 * 1024; i < 1024*1024*1024; i += 1024 * 1024 {
+	// 	buf := pool.Malloc(i)
+	// 	if len(buf) != i {
+	// 		t.Fatalf("invalid len: %v != %v", len(buf), i)
+	// 	}
+	// 	pool.Free(buf)
+	// }
+
+	buf := pool.Malloc(1)
+	for i := 1; i < 1024; i++ {
+		buf = pool.Append(buf[:1], make([]byte, i)...)
+		if len(buf) != i+1 {
+			t.Fatalf("invalid len: %v != %v", len(buf), i)
+		}
+	}
+	pool.Free(buf)
+	// pool.Free(buf)
+}
+
+func TestStackFuncs(t *testing.T) {
+	stack1, stackPtr := getStackAndPtr()
+	stack2 := ptr2StackString(stackPtr)
+	if stack1 != stack2 {
+		t.Fatalf("stack not equal:\n\n%v\n\n%v", stack1, stack2)
+	}
+
+	buf := []byte{1}
+	p1 := bytesPointer(buf)
+	buf[0] = 2
+	p2 := bytesPointer(buf)
+	if p1 != p2 {
+		t.Fatalf("buf pointer not equal: %v, %v", p1, p2)
+	}
+}
diff --git a/mempool/trace_debugger.go b/mempool/trace_debugger.go
index cc9b5644..64afb658 100644
--- a/mempool/trace_debugger.go
+++ b/mempool/trace_debugger.go
@@ -38,7 +38,7 @@ func (td *TraceDebugger) Malloc(size int) []byte {
 	buf := td.allocator.Malloc(size)
 	ptr := bytesPointer(buf)
 	if stackPtr, ok := td.pAlloced[ptr]; ok {
-		printStack("malloc got a buf which has been malloced by otherwhere", stackPtr)
+		printStack(fmt.Sprintf("malloc got a buf which has been malloced by otherwhere: %v", ptr), stackPtr)
 	}
 	td.setBufferPointer(ptr)
 	return buf
@@ -78,7 +78,7 @@ func (td *TraceDebugger) Append(buf []byte, more ...byte) []byte {
 	pnew := bytesPointer(newBuf)
 	if pnew != pold {
 		if preStack, ok := td.pAlloced[pnew]; ok {
-			printStack("Append got another new buf which has been malloced by otherwhere", preStack)
+			printStack(fmt.Sprintf("Append got another new buf which has been malloced by otherwhere: %v", pnew), preStack)
 		}
 		td.deleteBufferPointer(pold)
 		td.setBufferPointer(pnew)