Following function causes kernel restart on any usage of "ha" (Sage 7.2, VirtualBox in Windows7 x64):
def f(n):
pos_vectors = [[1, 1, 1, 1], [1, -1, 1, 1], [1, 1, -1, 1], [1, -1, -1, 1], [1, 1, 1, -1], [1, -1, 1, -1], [1, 1, -1, -1], [1, -1, -1, -1]]
HA = HyperplaneArrangements(QQ, tuple("x" + str(i) for i in range(n)))
ha = HA([[tuple(vector), 0] for vector in pos_vectors])
print(ha.n_regions())
f(4)
Too simple use case for bug. Is there something that I miss?