https://github.com/python/cpython/commit/574405c19e9b5de0504be46a3925027ded4495ae
commit: 574405c19e9b5de0504be46a3925027ded4495ae
branch: main
author: Sam Gross <[email protected]>
committer: colesbury <[email protected]>
date: 2025-10-23T10:18:13-04:00
summary:
gh-140431: Fix GC crash due to partially initialized coroutines (gh-140470)
The `make_gen()` function creates and tracks generator/coro objects, but
doesn't fully initialize all the fields. At a minimum, we need to
initialize all the fields that may be accessed by gen_traverse because
the call to `compute_cr_origin()` can trigger a GC.
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-10-22-17-22-22.gh-issue-140431.m8D_A-.rst
M Objects/genobject.c
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2025-10-22-17-22-22.gh-issue-140431.m8D_A-.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2025-10-22-17-22-22.gh-issue-140431.m8D_A-.rst
new file mode 100644
index 00000000000000..3d62d210f1f007
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2025-10-22-17-22-22.gh-issue-140431.m8D_A-.rst
@@ -0,0 +1,3 @@
+Fix a crash in Python's :term:`garbage collector <garbage collection>` due to
+partially initialized :term:`coroutine` objects when coroutine origin tracking
+depth is enabled (:func:`sys.set_coroutine_origin_tracking_depth`).
diff --git a/Objects/genobject.c b/Objects/genobject.c
index c9ca2f1de51ddc..2371ad16d5c1a6 100644
--- a/Objects/genobject.c
+++ b/Objects/genobject.c
@@ -932,6 +932,7 @@ make_gen(PyTypeObject *type, PyFunctionObject *func)
gen->gi_weakreflist = NULL;
gen->gi_exc_state.exc_value = NULL;
gen->gi_exc_state.previous_item = NULL;
+ gen->gi_iframe.f_executable = PyStackRef_None;
assert(func->func_name != NULL);
gen->gi_name = Py_NewRef(func->func_name);
assert(func->func_qualname != NULL);
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