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[3.13] gh-118561: Fix crash involving list.extend in free-threaded build (GH-118723) (#118863)

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The `list_preallocate_exact` function did not zero initialize array
contents. In the free-threaded build, this could expose uninitialized
memory to concurrent readers between the call to
`list_preallocate_exact` and the filling of the array contents with
items.
(cherry picked from commit 2402715e10)

Co-authored-by: Sam Gross <colesbury@gmail.com>
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Miss Islington (bot) 2024-05-09 21:14:47 +02:00 • committed by GitHub
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commit 846cfb9a67
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Fix race condition in free-threaded build where :meth:`list.extend` could expose
uninitialied memory to concurrent readers.