Clean up dataMap entry on Release().

pkg/stats/stats.go

@@ -405,6 +405,19 @@ func (stats *Stats) Release() {
 		// ignoring nil check errors
 		_ = stats.vsm.Destroy()
 	}
+	if stats.dataIdx == -1 {
+		return
+	}
+	dataLock.Lock()
+	data, ok := dataMap[stats.dataIdx]
+	if !ok {
+		dataLock.Unlock()
+		panic("unmapped stats data")
+	}
+	data.names = nil
+	data.d9ns = nil
+	delete(dataMap, stats.dataIdx)
+	dataLock.Unlock()
 }
 
 //export point