An issue in CPU Pipelining that occurs when it takes multiple clock cycles to complete a task.
This will create a bottleneck, where prior and subsequent tasks must wait for the current task to finish.
The subsequent tasks will perform ‘bubble tasks’ in which they do NOTHING
Solutions
CPUs offer multiple pipelines so that if one pipeline is stalled, the operation goes to another pipeline. I know, its not an eloquent solution, but its what we got.