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gh-149162: Use _Py_LOCK_DONT_DETACH in intern_common #149164

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gh-149162: Use _Py_LOCK_DONT_DETACH in intern_common #149164

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gh-149162: Use _Py_LOCK_DONT_DETACH in intern_common
colesbury Apr 29, 2026
36a25cd
Merge branch 'main' into gh-149162-intern-common-lock-dont-detach
colesbury May 21, 2026
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-04-29-15-10-59.gh-issue-149162.BPPyrq.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix a potential deadlock in :c:func:`PyUnicode_InternFromString` and other
interning functions in the :term:`free-threaded build` when called from C++
static local initializers.
2 changes: 1 addition & 1 deletion Objects/unicodeobject.c
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Expand Up @@ -14347,7 +14347,7 @@ intern_common(PyInterpreterState *interp, PyObject *s /* stolen */,
}
#endif

FT_MUTEX_LOCK(INTERN_MUTEX);
FT_MUTEX_LOCK_FLAGS(INTERN_MUTEX, _Py_LOCK_DONT_DETACH);
PyObject *t;
{
int res = PyDict_SetDefaultRef(interned, s, s, &t);
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