[3.13] gh-118561: Fix crash involving list.extend in free-threaded build (GH-118723) #118863
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…ld (pythonGH-118723) 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 2402715) Co-authored-by: Sam Gross <colesbury@gmail.com>
This was referenced May 9, 2024
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The
list_preallocate_exactfunction did not zero initialize arraycontents. In the free-threaded build, this could expose uninitialized
memory to concurrent readers between the call to
list_preallocate_exactand the filling of the array contents withitems.
(cherry picked from commit 2402715)
Co-authored-by: Sam Gross colesbury@gmail.com
test_free_threading.test_racing_iter_extendcrash #118561