gh-118561: Fix crash involving list.extend in free-threaded build #118723
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters
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.
corona10 reviewed May 8, 2024
Misc/NEWS.d/next/Core and Builtins/2024-05-07-16-57-56.gh-issue-118561.wNMKVd.rst Outdated Show resolved Hide resolved
…e-118561.wNMKVd.rst Co-authored-by: Donghee Na <donghee.na92@gmail.com>
| Thanks @colesbury for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13. |
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request May 9, 2024
…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>
| GH-118863 is a backport of this pull request to the 3.13 branch. |
colesbury added a commit that referenced this pull request May 9, 2024
…ild (GH-118723) (#118863) 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>
SonicField pushed a commit to SonicField/cpython that referenced this pull request May 10, 2024
…ld (python#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.
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit. This suggestion is invalid because no changes were made to the code. Suggestions cannot be applied while the pull request is closed. Suggestions cannot be applied while viewing a subset of changes. Only one suggestion per line can be applied in a batch. Add this suggestion to a batch that can be applied as a single commit. Applying suggestions on deleted lines is not supported. You must change the existing code in this line in order to create a valid suggestion. Outdated suggestions cannot be applied. This suggestion has been applied or marked resolved. Suggestions cannot be applied from pending reviews. Suggestions cannot be applied on multi-line comments. Suggestions cannot be applied while the pull request is queued to merge. Suggestion cannot be applied right now. Please check back later.
The
list_preallocate_exactfunction did not zero initialize array contents. In the free-threaded build, this could expose uninitialized memory to concurrent readers between the call tolist_preallocate_exactand the filling of the array contents with items.test_free_threading.test_racing_iter_extendcrash #118561