This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Author leezu
Recipients leezu
Date 2020-02-27.21:52:08
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <>
Below sample program, will raise "Modules/gcmodule.c:110: gc_decref: Assertion "gc_get_refs(g) > 0" failed: refcount is too small" on Python 3.8.2 debug build.
On 3.7.6 debug build, "Modules/gcmodule.c:277: visit_decref: Assertion `_PyGCHead_REFS(gc) != 0' failed." is raised.

import collections
import gc
import weakref

hooks_dict = collections.OrderedDict()
hooks_dict_ref = weakref.ref(hooks_dict)

print('Hello world')

The complete error message on 3.8.2 debug build is

Modules/gcmodule.c:110: gc_decref: Assertion "gc_get_refs(g) > 0" failed: refcount is too small
Memory block allocated at (most recent call first):
  File "/home/$USER/", line 6

object  : <weakref at 0x7ff788208a70; to 'collections.OrderedDict' at 0x7ff7881fab90>
type    : weakref
refcount: 1
address : 0x7ff788208a70
Fatal Python error: _PyObject_AssertFailed
Python runtime state: initialized

Current thread 0x00007ff789f9c080 (most recent call first):
  File "/home/$USER/", line 7 in <module>
zsh: abort      PYTHONTRACEMALLOC=1 python ~/
Date User Action Args
2020-02-27 21:52:09leezusetrecipients: + leezu
2020-02-27 21:52:09leezusetmessageid: <>
2020-02-27 21:52:09leezulinkissue39778 messages
2020-02-27 21:52:08leezucreate