STINNER Victor <[email protected]> added the comment:
Notes for myself.
the visit_decref() has been updated to display repr() of the parent object,
rather than display the "freed" object.
Before:
---
Modules/gcmodule.c:378: visit_decref: Assertion "!_PyObject_IsFreed(op)" failed
<object at 0x5557629ca260 is freed>
Fatal Python error: _PyObject_AssertFailed
Python runtime state: preinitialized
Current thread 0x00007f6e2863e740 (most recent call first):
<no Python frame>
---
After:
---
Modules/gcmodule.c:378: visit_decref: Assertion "!_PyObject_IsFreed(op)" failed
Enable tracemalloc to get the memory block allocation traceback
object address : 0x7fe2d1a52b40
object refcount : 1
object type : 0x740be0
object type name: dict
object repr : {'__repr__': <slot wrapper '__repr__' of 'weakref' objects>,
'__hash__': <slot wrapper '__hash__' of 'weakref' objects>, '__call__': <slot
wrapper '__call__' of 'weakref' objects>, '__lt__': <slot wrapper '__lt__' of
'weakref' objects>, '__le__': <slot wrapper '__le__' of 'weakref' objects>,
'__eq__': <slot wrapper '__eq__' of 'weakref' objects>, '__ne__': <slot wrapper
'__ne__' of 'weakref' objects>, '__gt__': <slot wrapper '__gt__' of 'weakref'
objects>, '__ge__': <slot wrapper '__ge__' of 'weakref' objects>, '__init__':
<slot wrapper '__init__' of 'weakref' objects>, '__new__': <built-in method
__new__ of type object at 0x749500>, '__callback__': <member '__callback__' of
'weakref' objects>, '__doc__': None}
Fatal Python error: _PyObject_AssertFailed
Python runtime state: preinitialized
Current thread 0x00007fe2dea35740 (most recent call first):
<no Python frame>
---
The problem was that the None object was seen as "freed" because
_ob_prev=_ob_next=NULL. This object doesn't seem to be part of the list of all
objects, sys.getobjects(). I fixed Py_None, but then I got the same assertion
error on a different (moduledef) object. I gave up, and Pablo and me fixed
_PyObject_IsFreed() instead.
----------
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Python tracker <[email protected]>
<https://bugs.python.org/issue38400>
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