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[3.12] gh-105699: Fix an Interned Strings Crasher (gh-106930) #106963

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Merged
merged 1 commit into from
Jul 21, 2023
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[3.12] gh-105699: Fix an Interned Strings Crasher (gh-106930) #106963

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2023-07-20-15-15-57.gh-issue-105699.DdqHFg.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Python no longer crashes due an infrequent race when initialzing
per-interpreter interned strings. The crash would manifest when the
interpreter was finalized.
13 changes: 12 additions & 1 deletion Objects/unicodeobject.c
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Expand Up @@ -14817,6 +14817,7 @@ _PyUnicode_ClearInterned(PyInterpreterState *interp)
PyObject *s, *ignored_value;
while (PyDict_Next(interned, &pos, &s, &ignored_value)) {
assert(PyUnicode_IS_READY(s));
int shared = 0;
switch (PyUnicode_CHECK_INTERNED(s)) {
case SSTATE_INTERNED_IMMORTAL:
// Skip the Immortal Instance check and restore
Expand All @@ -14828,6 +14829,14 @@ _PyUnicode_ClearInterned(PyInterpreterState *interp)
#endif
break;
case SSTATE_INTERNED_IMMORTAL_STATIC:
/* It is shared between interpreters, so we should unmark it
only when this is the last interpreter in which it's
interned. We immortalize all the statically initialized
strings during startup, so we can rely on the
main interpreter to be the last one. */
if (!_Py_IsMainInterpreter(interp)) {
shared = 1;
}
break;
case SSTATE_INTERNED_MORTAL:
/* fall through */
Expand All @@ -14836,7 +14845,9 @@ _PyUnicode_ClearInterned(PyInterpreterState *interp)
default:
Py_UNREACHABLE();
}
_PyUnicode_STATE(s).interned = SSTATE_NOT_INTERNED;
if (!shared) {
_PyUnicode_STATE(s).interned = SSTATE_NOT_INTERNED;
}
}
#ifdef INTERNED_STATS
fprintf(stderr,
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