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Race around problem is unwanted and uncontrollable oscillations occuring in level trigerred JK flipflop due to a feedback from output to input. It is overcome by master-slave configuration, edge triggering etc.
in jk latch, the output is feedback to the input, and therefore change in the output causes the change in inputs. due to this in the postive half of the clock pulse if j and k both are high then the output toggles simultaneously. this condition is known as race around condition.
to overcome this problem we should use master slave ff.
In JK flip flop we provide feedback path sometimes both the inputs are high which gives Erroneous state.Or we can say A condition in logic network in which the difference in propagation times through two or more signal paths in the network can produce an erroneous output.This can be removed by using Master slave Flip flop.