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gh-142662: Fix interpreter startup crash when codecs are not initialized yet #161860

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gh-142662: Fix interpreter startup crash when codecs are not initialized yet #161860

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-11-12-12-42-17.gh-issue-142662.cLSNjB.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fixed a possible crash on interpreter startup when codecs are not
initialized.
5 changes: 4 additions & 1 deletion Python/codecs.c
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Expand Up @@ -139,7 +139,10 @@ PyObject *_PyCodec_Lookup(const char *encoding)
}

PyInterpreterState *interp = _PyInterpreterState_GET();
assert(interp->codecs.initialized);
if (!interp->codecs.initialized) {
PyErr_SetString(PyExc_SystemError, "Codecs are not initialized");
return NULL;
}

/* Convert the encoding to a normalized Python string: all
ASCII letters are converted to lower case, spaces are
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