[Python-checkins] [3.10] bpo-47182: Fix crash by named unicode characters after interpreter reinitialization (GH-32212) (GH-32216)

[tiran]

https://github.com/python/cpython/commit/55d5c96c57738766eb6f3b5ccfa6599d5f094c18
commit: 55d5c96c57738766eb6f3b5ccfa6599d5f094c18
branch: 3.10
author: Christian Heimes <christian at python.org>
committer: tiran <christian at python.org>
date: 2022-04-01T10:44:56+02:00
summary:

[3.10] bpo-47182: Fix crash by named unicode characters after interpreter reinitialization (GH-32212) (GH-32216)

Co-authored-by: Christian Heimes <christian at python.org>

files:
A Misc/NEWS.d/next/Core and Builtins/2022-03-31-15-37-02.bpo-47182.e_4SsC.rst
M Objects/unicodeobject.c

diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-03-31-15-37-02.bpo-47182.e_4SsC.rst b/Misc/NEWS.d/next/Core and Builtins/2022-03-31-15-37-02.bpo-47182.e_4SsC.rst
new file mode 100644
index 0000000000000..08036bc680933
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-03-31-15-37-02.bpo-47182.e_4SsC.rst	
@@ -0,0 +1,2 @@
+Fix a crash when using a named unicode character like ``"\N{digit nine}"``
+after the main interpreter has been initialized a second time.
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 077cf8d7f4560..377fa6c8e2a28 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -16352,6 +16352,9 @@ _PyUnicode_Fini(PyInterpreterState *interp)
     if (_Py_IsMainInterpreter(interp)) {
         // _PyUnicode_ClearInterned() must be called before _PyUnicode_Fini()
         assert(interned == NULL);
+        // bpo-47182: force a unicodedata CAPI capsule re-import on
+        // subsequent initialization of main interpreter.
+        ucnhash_capi = NULL;
     }
 
     _PyUnicode_FiniEncodings(&state->fs_codec);