I don't have a Mac and don't know where to begin debugging this, @jorenham any ideas?

I don't think that mypy is at (seg)fault here: The segfault occurs when calling np.random.bit_generator.SeedSequence.spawn:

numpy/numpy/typing/tests/data/pass/random.py

Lines 59 to 60 in 2a7a0d0

    
           seed_seq: np.random.bit_generator.SeedSequence = np.random.SeedSequence(SEED_NONE) 
        
           seed_seq.spawn(10)

edit

The only obvious thing I could find that could segfault in the bit_generator source is this:

numpy/numpy/random/bit_generator.pyx

Lines 341 to 374 in 2a7a0d0

    
               cdef mix_entropy(self, np.ndarray[np.npy_uint32, ndim=1] mixer, 
        
                                np.ndarray[np.npy_uint32, ndim=1] entropy_array): 
        
                   """ Mix in the given entropy to mixer. 
        
                   Parameters 
        
                   ---------- 
        
                   mixer : 1D uint32 array, modified in-place 
        
                   entropy_array : 1D uint32 array 
        
                   """ 
        
                   cdef uint32_t hash_const[1] 
        
                   hash_const[0] = INIT_A 
        
                   # Add in the entropy up to the pool size. 
        
                   for i in range(len(mixer)): 
        
                       if i < len(entropy_array): 
        
                           mixer[i] = hashmix(entropy_array[i], hash_const) 
        
                       else: 
        
                           # Our pool size is bigger than our entropy, so just keep 
        
                           # running the hash out. 
        
                           mixer[i] = hashmix(0, hash_const) 
        
                   # Mix all bits together so late bits can affect earlier bits. 
        
                   for i_src in range(len(mixer)): 
        
                       for i_dst in range(len(mixer)): 
        
                           if i_src != i_dst: 
        
                               mixer[i_dst] = mix(mixer[i_dst], 
        
                                                  hashmix(mixer[i_src], hash_const)) 
        
                   # Add any remaining entropy, mixing each new entropy word with each 
        
                   # pool word. 
        
                   for i_src in range(len(mixer), len(entropy_array)): 
        
                       for i_dst in range(len(mixer)): 
        
                           mixer[i_dst] = mix(mixer[i_dst], 
        
                                              hashmix(entropy_array[i_src], hash_const))

But I don't see any fishy indexing here or something 🤔

	seed_seq: np.random.bit_generator.SeedSequence = np.random.SeedSequence(SEED_NONE)
	seed_seq.spawn(10)

	cdef mix_entropy(self, np.ndarray[np.npy_uint32, ndim=1] mixer,
	np.ndarray[np.npy_uint32, ndim=1] entropy_array):
	""" Mix in the given entropy to mixer.

	Parameters
	----------
	mixer : 1D uint32 array, modified in-place
	entropy_array : 1D uint32 array
	"""
	cdef uint32_t hash_const[1]
	hash_const[0] = INIT_A

	# Add in the entropy up to the pool size.
	for i in range(len(mixer)):
	if i < len(entropy_array):
	mixer[i] = hashmix(entropy_array[i], hash_const)
	else:
	# Our pool size is bigger than our entropy, so just keep
	# running the hash out.
	mixer[i] = hashmix(0, hash_const)

	# Mix all bits together so late bits can affect earlier bits.
	for i_src in range(len(mixer)):
	for i_dst in range(len(mixer)):
	if i_src != i_dst:
	mixer[i_dst] = mix(mixer[i_dst],
	hashmix(mixer[i_src], hash_const))

	# Add any remaining entropy, mixing each new entropy word with each
	# pool word.
	for i_src in range(len(mixer), len(entropy_array)):
	for i_dst in range(len(mixer)):
	mixer[i_dst] = mix(mixer[i_dst],
	hashmix(entropy_array[i_src], hash_const))

Uh oh!

BUG: in-place fixed-width string multiply doesn't do overflow checking #29011

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