Industrial fault description:

F2 is a fault that multiple messages are displayed in wrong order.
Sometimes we send many requests at a short time.
However, these requests may returns at a different order with the origin.
If we display the information without checking the order of these requests, wrong information may be shown on the screen.
Then this kind of fault occurs.



TrainTicket replicated fault description:

In TrainTicket system, every request for ticket-reservation has a random delay to simulate the unstable network condition.
If a user send multiple requests for ticket-reservation at a short time, the order of the result may be wrong due to the random delay.
Then this fault occurs.