[3.14] gh-157660: Fix stale TLBC caches in _remote_debugging (GH-157732) - #158007
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`profiling.sampling` reporting errors or incorrect line numbers in free-threaded builds when a thread-local bytecode array grows or gains entries after being cached.
liuzhijie-0614
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September 23, 2026 15:42
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Backport of #157732 to 3.14; fixes #157660. The main-branch PR is still open.
In free-threaded builds, TLBC arrays can grow or gain entries without changing tlbc_generation, leaving _remote_debugging with stale cached data. This can cause persistent Invalid tlbc_index errors or incorrect line numbers.
Refresh the cached array when a frame’s index exceeds its capacity or points to a cached NULL slot, while retaining the existing bounds checks.
Adds regression tests based on both reproducers in the issue.