py-spy segfault with --subprocesses

from concurrent.futures import ProcessPoolExecutor

def lfilter(filt_b, filt_a, x_t, axis=-1):
    import scipy.signal
    y_t = scipy.signal.lfilter(filt_b, filt_a, x_t, axis=axis)
    return y_t

if __name__ == '__main__':
    for _ in range(100):
        with ProcessPoolExecutor(1) as executor:
            executor.submit(lfilter, [1.0], [1.0], [1.0]).result()