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[3.14] gh-144986: Fix memory leak in atexit.register() (GH-144987) #145020

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Merged
kumaraditya303 merged 1 commit into from
Mar 16, 2026
+6 −0
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[3.14] gh-144986: Fix memory leak in atexit.register() (GH-144987) #145020

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gh-144986: Fix memory leak in atexit.register() (GH-144987) 
(cherry picked from commit 50c1471)

Co-authored-by: Shamil <[email protected]>
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@ashm-dev @miss-islington
ashm-dev authored and miss-islington committed Feb 19, 2026
commit 2065be9d6ebe9f2dcbf8de07028ff2c3614d2a71
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2026-02-19-00-00-00.gh-issue-144986.atexit-leak.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix a memory leak in :func:`atexit.register`.
Patch by Shamil Abdulaev.
4 changes: 4 additions & 0 deletions Modules/atexitmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -184,13 +184,17 @@ atexit_register(PyObject *module, PyObject *args, PyObject *kwargs)
return NULL;
}
PyObject *func_args = PyTuple_GetSlice(args, 1, PyTuple_GET_SIZE(args));
if (func_args == NULL) {
return NULL;
}
PyObject *func_kwargs = kwargs;

if (func_kwargs == NULL)
{
func_kwargs = Py_None;
}
PyObject *callback = PyTuple_Pack(3, func, func_args, func_kwargs);
Py_DECREF(func_args);
if (callback == NULL)
{
return NULL;
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