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The most obvious explanation for that failure is that the barrier's timeout is too low.
 def test_default_timeout(self):
 """
 Test the barrier's default timeout
 """
 #create a barrier with a low default timeout
 barrier = self.barriertype(self.N, timeout=0.1)
If the last thread waits on the barrier more than 0.1s after the first thread, then you'll get a BrokenBarrierError.
A 0.1s delay is not that much, 100ms was the default quantum with Linux O(1) scheduler...