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FusedFunctionObject half-initialized during GC tracking #3215

achernomorov opened this issue Oct 28, 2019 · 0 comments


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@achernomorov achernomorov commented Oct 28, 2019

There are new CPython behavior about GC tracking of half initialized objects

FusedFunctionObject is about to be in half-initialized state then base CyFunctionObject "constructor" calls GC_Track.


../Modules/gcmodule.c:2019: visit_validate: Assertion failed: PyObject_GC_Track() object is not valid
Enable tracemalloc to get the memory block allocation traceback

object address : 0x7fcc7c1109b0
object refcount : 1
object type : 0x7fcc6a4c1660
object type name: fused_cython_function
object repr : <cyfunction get_nonzero_line at 0x7fcc7c1109b0>

Fatal Python error: _PyObject_AssertFailed
Python runtime state: initialized


python 3.9 ( latest from github)
./configure --with-pydebug --enable-profiling
Python need to be build with PY_DEBUG - issue38392 is new functionality so it under PY_DEBUG for now.


import scipy.ndimage._ni_label

achernomorov added a commit to achernomorov/cython that referenced this issue Oct 28, 2019
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