ARPACK memory error

AR_crash.py

import numpy as np
from scipy.sparse.linalg import eigs

N = 6
k = 2

# with this random seed, I get a memory error on the third iteration below
np.random.seed(2301)
A = np.random.random((N,N))

for i in range(3):
    print i
    evals2, evecs2 = eigs(A, k)

Given that many of the memory errors are on or after an allocated block of size 240 bytes = 30 doubles, I think this has to do with the array "v" passed to dnaupd. In this case, the shape of v is (n,ncv) where ncv=2*k+1, with n=6 and k=2 in our case.