Ivan Pozdeev <ivan_pozd...@mail.ru> added the comment:

Found yet another race condition -- when creating multiple Tk()s. Attached  
example (loops indefinitely inside Tcl: some internal list becomes circular for 
some reason).

The obvious fix by wrapping Tcl calls with locks in Tkapp_New doesn't fix it -- 
must be something else.

Since creatng multiple Tk's is an uncommon use case, this can wait.

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Added file: https://bugs.python.org/file47620/test_threads_tk.py

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<https://bugs.python.org/issue33257>
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