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[3.12] gh-105699: Fix a Crasher Related to a Deprecated Global Variab…
…le (gh-106923) (#106964) gh-105699: Fix a Crasher Related to a Deprecated Global Variable (gh-106923) There was a slight race in _Py_ClearFileSystemEncoding() (when called from _Py_SetFileSystemEncoding()), between freeing the value and setting the variable to NULL, which occasionally caused crashes when multiple isolated interpreters were used. (Notably, I saw at least 10 different, seemingly unrelated spooky-action-at-a-distance, ways this crashed. Yay, free threading!) We avoid the problem by only setting the global variables with the main interpreter (i.e. runtime init). (cherry picked from commit 0ba07b2) Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>
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