[3.15] Add MSan to CI (GH-158625) - #158832
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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)
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This reverts commit 1bc78de.
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Backport of #158625 to 3.15. Omit the multiprocessing skips for tests introduced in 3.16; the 3.15 C-extension tests already check for pip before setting up a virtual environment.
Includes the updated 3.15 base with #158691, the bytes.fromhex bounds fix required by MSan.
The faulthandler, socket, monitoring, and profiling suites pass (1,361 tests, 235 skipped).
(cherry picked from commit b93fb19)