find_key(): This routine wasn't thread-correct, and accounts for the
release-build failures noted in bug 1041645.
This is a critical bugfix. I'm not going to backport it, though (no time).
diff --git a/Misc/NEWS b/Misc/NEWS
index 9e5477e..e279dca 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,11 @@
Core and builtins
-----------------
+- The internal portable implementation of thread-local storage (TLS), used
+ by the ``PyGILState_Ensure()``/``PyGILState_Release()`` API, was not
+ thread-correct. This could lead to a variety of problems, up to and
+ including segfaults. See bug 1041645 for an example.
+
- Added a command line option, -m module, which searches sys.path for the
module and then runs it. (Contributed by Nick Coghlan.)