8000 PyPy 3.11 incompatibility: TypeError: object.__new__(_CDataBase) is not safe, use _CDataBase.__new__() #5462 · Issue #5291 · pypy/pypy · GitHub
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PyPy 3.11 incompatibility: TypeError: object.__new__(_CDataBase) is not safe, use _CDataBase.__new__() #5462 #5291

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notxvilka opened this issue Jun 4, 2025 · 6 comments
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PyPy 3.11 incompatibility: TypeError: object.__new__(_CDataBase) is not safe, use _CDataBase.__new__() #5462 #5291

notxvilka opened this issue Jun 4, 2025 · 6 comments

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@notxvilka
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I am not sure, if the bug is in Angr or in PyPy, but it happens only when calling Angr analysis concurrently. And the error happens in the PyPy's code, so I opened here as well.

/usr/lib/pypy3.11/concurrent/futures/_base.py:456: in result
    return self.__get_result()
/usr/lib/pypy3.11/concurrent/futures/_base.py:401: in __get_result
    raise self._exception
/usr/lib/pypy3.11/concurrent/futures/thread.py:58: in run
    result = self.fn(*self.args, **self.kwargs)
/home/user/.local/lib/pypy3.11/site-packages/angr/analyses/analysis.py:226: in __call__
    r = w(*args, **kwargs)
/home/user/.local/lib/pypy3.11/site-packages/angr/analyses/analysis.py:211: in wrapper
    oself.__init__(*args, **kwargs)
/home/user/.local/lib/pypy3.11/site-packages/angr/analyses/complete_calling_conventions.py:126: in __init__
    self.work()
/home/user/.local/lib/pypy3.11/site-packages/angr/analyses/complete_calling_conventions.py:275: in work
    func_addr, cc, proto, proto_libname, varman = self._results.get(True, timeout=0.01)
/usr/lib/pypy3.11/multiprocessing/queues.py:122: in get
    return _ForkingPickler.loads(res)
/usr/lib/pypy3.11/pickle.py:1785: in _loads
    return _Unpickler(file, fix_imports=fix_imports, buffers=buffers,
/usr/lib/pypy3.11/pickle.py:1226: in load
    dispatch[key[0]](self)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
self = <pickle._Unpickler object at 0x00007f2d600d7ec0>
    def load_newobj(self):
        args = self.stack.pop()
        cls = self.stack.pop()
>       obj = cls.__new__(cls, *args)
E       TypeError: object.__new__(_CDataBase) is not safe, use _CDataBase.__new__()
/usr/lib/pypy3.11/pickle.py:1527: TypeError

This looks similar to python/cpython#78465
@mattip
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mattip commented Jun 5, 2025

What is _CDataBase, where does it come from?

@mattip
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mattip commented Jun 5, 2025

Could you add a try: except: around the call to return _ForkingPickler.loads(res) and provide the contents of res?

@cfbolz
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cfbolz commented Jun 5, 2025

it's a class from cffi, I'm not sure they are picklable

@mattip
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mattip commented Jun 5, 2025

I think that should not be exposed in the pickled object, so it would be nice to see what actually is getting pickled.

@mattip
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mattip commented Jun 14, 2025

it's a class from cffi, I'm not sure they are picklable

somehow it works on CPython, so @notxvilka it would be good to figure out how we can reproduce this.

@notxvilka
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it's a class from cffi, I'm not sure they are picklable

somehow it works on CPython, so @notxvilka it would be good to figure out how we can reproduce this.

Ok, here is the pickle string (example_8) that caused this error, I retried the attached script individually, and it is triggered consistently. It requires installed Angr though:

pypy-bug-5291.zip

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@cfbolz @mattip @notxvilka
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