[3.14] gh-116738: Fix thread-safety issue in re module for free threading (gh-141923)#141990
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colesbury merged 1 commit intopython:3.14from Nov 26, 2025
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…ing (pythongh-141923) Added atomic operations to `scanner_begin()` and `scanner_end()` to prevent race conditions on the `executing` flag in free-threaded builds. Also added tests for concurrent usage of the `re` module. Without the atomic operations, `test_scanner_concurrent_access()` triggers `assert(self->executing)` failures, or a thread sanitizer run emits errors. (cherry picked from commit bc9e63d) Co-authored-by: Alper <alperyoney@fb.com>
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Added atomic operations to
scanner_begin()andscanner_end()to preventrace conditions on the
executingflag in free-threaded builds. Also addedtests for concurrent usage of the
remodule.Without the atomic operations,
test_scanner_concurrent_access()triggersassert(self->executing)failures, or a thread sanitizer run emits errors.(cherry picked from commit bc9e63d)
Co-authored-by: Alper alperyoney@fb.com