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[3.14] gh-153364: Make frame, coroutine, and task-waiter chain walks iterative and bounded (GH-153365) by pablogsal · Pull Request #158814 · python/cpython · GitHub

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[3.14] gh-153364: Make frame, coroutine, and task-waiter chain walks iterative and bounded (GH-153365) - #158814

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pablogsal merged 1 commit into
python:3.14from
pablogsal:backport-153365-3.14
Oct 5, 2026
Merged

pablogsal merged 1 commit into
python:3.14from
pablogsal:backport-153365-3.14

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pablogsal commented Oct 5, 2026 •
edited by bedevere-app Bot
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Backport of #153365 to 3.14. Adapts the walks to the monolithic remote-debugging module, preserving the existing 1,024-frame limit and tagged-pointer reads.

The external-inspection suite passes in debug and free-threaded debug builds. The new tests also skip when remote-memory access is denied.

(cherry picked from commit e0861c6)

…terative and bounded (python#153365)

* let me declare single limit

* use our new limit in process_frame_chain()

* add it in parse_async_frame_chain()

* parse_coro_chain()

* NEWS

* async in the message?

* test

* no race

* process_task_awaited_by

* process_task_awaited_by limit test

* NEWS

* MAX_TASK_WAITER_CHAIN_DEPTH

* TASK_WAITER_CHAIN_DEPTH in test

* TASK_WAITER_CHAIN_DEPTH 256

* prevent the drift with the comment

* better naming, better style

* MAX_TASK_WAITER_CHAIN_DEPTH comment

* task-waiter iterative bfs walk

* iterative coro-walk

* nicer news

* 1 << 14

* comment

* unused read_Py_ssize_t

* fix tombstones

* simplify

* correct msg

* better test

* news for tombstones

* left-over from when testing buggy version

* redundant new line

(cherry picked from commit e0861c6)
pablogsal requested review from 1st1 and ambv as code owners October 5, 2026 00:10
pablogsal enabled auto-merge (squash) October 5, 2026 00:10
pablogsal merged commit f660816 into python:3.14 Oct 5, 2026
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pablogsal deleted the backport-153365-3.14 branch October 5, 2026 00:37
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