Race condition
A race condition or race hazard is the behavior of an electronics, software, or other system where the system's substantive behavior is dependent on the sequence or timing of other uncontrollable events. It becomes a bug when one or more of the possible behaviors is undesirable.
Java Pathfinder
The following system under test contains a simple race condition between two threads accessing the same variable codice_1 in statements (1) and (2), which can lead to a division by zero exception if (1) is executed before (2)
public class Racer implements Runnable {