[3.14] Add MSan to CI (GH-158625) - #158834
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* Run the test suite with MSan in CI * Additional fixes * Add `_Py_MSAN_UNPOISON_STRING` * Apply Victor's suggestions Co-authored-by: Victor Stinner <victor.stinner@gmail.com> * Apply Victor's suggestions Co-authored-by: Victor Stinner <victor.stinner@gmail.com> --------- Co-authored-by: Victor Stinner <victor.stinner@gmail.com> (cherry picked from commit b93fb19)
pablogsal
requested review from
AA-Turner,
StanFromIreland,
corona10,
erlend-aasland,
ezio-melotti,
hugovk and
webknjaz
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October 5, 2026 09:27
Documentation build overview
310 files changed ·
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pablogsal
enabled auto-merge (squash)
October 5, 2026 09:38
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Backport of #158625 to 3.14. Keep the existing UBSan flags and omit changes to the binary profiler, frame-pointer helper, and tests that are absent from this branch. Add the two MSan unpoison macros used by the socket and POSIX fixes, including the getrandom output annotation already present in newer branches.
The fuzz harness also needs the existing main-branch fix to accept ValueError for non-ASCII struct formats; its failing input is now covered by the smoke test.
The faulthandler, socket, and monitoring suites pass (885 tests, 230 skipped). All 382 test_os tests also pass under MSan after adding the getrandom annotation.
(cherry picked from commit b93fb19)