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author	Sam Gross <colesbury@gmail.com>
	Mon, 8 Jul 2024 18:52:07 +0000 (14:52 -0400)
committer	GitHub <noreply@github.com>
	Mon, 8 Jul 2024 18:52:07 +0000 (14:52 -0400)
commit	1d3cf79a501a93a7a488fc75d4db3060c5ee7d1a
tree	2e2f59a0d466ee4abccae054281be060c578e094	tree \| snapshot
parent	31873bea471020ca5deaf735d9acb0f1abeb1d3c	commit \| diff

gh-121368: Fix seq lock memory ordering in _PyType_Lookup (#121388)

The `_PySeqLock_EndRead` function needs an acquire fence to ensure that
the load of the sequence happens after any loads within the read side
critical section. The missing fence can trigger bugs on macOS arm64.

Additionally, we need a release fence in `_PySeqLock_LockWrite` to
ensure that the sequence update is visible before any modifications to
the cache entry.

Include/cpython/pyatomic.h		diff \| blob \| blame \| history
Include/cpython/pyatomic_gcc.h		diff \| blob \| blame \| history
Include/cpython/pyatomic_msc.h		diff \| blob \| blame \| history
Include/cpython/pyatomic_std.h		diff \| blob \| blame \| history
Include/internal/pycore_lock.h		diff \| blob \| blame \| history
Misc/NEWS.d/next/Core and Builtins/2024-07-04-23-38-30.gh-issue-121368.m3EF9E.rst	[new file with mode: 0644]	blob
Modules/_testcapi/pyatomic.c		diff \| blob \| blame \| history
Objects/typeobject.c		diff \| blob \| blame \| history
Python/lock.c		diff \| blob \| blame \| history

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