BUG: np.random.Generator(MyBitGenerator).random() segfaults every time #25023
Description
Describe the issue:
I was trying to implement my own random generator but encountered a crash when trying to use it with a Generator. Mine is based on CFFI so that was a suspect but the simplified test case below crashes any machine where I try it even though it doesn't do anything dangerous.
Reproduce the code example:
import numpy as np
class FakeRandom(np.random.BitGenerator):
def __init__(self, seed=None):
super().__init__(seed)
def random_raw(self, size=None):
return 0
def spawn(self, n):
raise NotImplementedError
bg = FakeRandom()
gen = np.random.Generator(bg)
print(gen) # Prints Generator(FakeRandom)
gen.random() # SIGSEGVError message:
Traceback:
#0 0x0000000000000000 in ?? ()
#1 0x00007fffa5fa6867 in random_standard_uniform_fill ()
from /home/user/.local/share/hatch/env/virtual/randquik/45ZJMGs_/randquik/lib/python3.10/site-packages/numpy/random/_generator.cpython-310-x86_64-linux-gnu.so
#2 0x00007fffa61d08d8 in __pyx_f_5numpy_6random_7_common_double_fill ()
from /home/user/.local/share/hatch/env/virtual/randquik/45ZJMGs_/randquik/lib/python3.10/site-packages/numpy/random/_common.cpython-310-x86_64-linux-gnu.so
#3 0x00007fffa5f805f7 in __pyx_pw_5numpy_6random_10_generator_9Generator_15random ()
from /home/user/.local/share/hatch/env/virtual/randquik/45ZJMGs_/randquik/lib/python3.10/site-packages/numpy/random/_generator.cpython-310-x86_64-linux-gnu.so
#4 0x00005555556d4dde in ?? ()
#5 0x000055555569cf52 in _PyEval_EvalFrameDefault ()
### Runtime information:
Python 3.10.12, WSL2, Numpy 1.26.1 - SIGSEGV
Python 3.11.0, Windows, Numpy 1.24.1 - just terminates with no error message
Python 3.11.2, Linux, Numpy 1.25.2 - SIGSEGV
### Context for the issue:
My random generator is of better quality and runs faster than MT or PCG64 (which are also very fast in Numpy implementation).