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asyncio.capture_call_graph: AttributeError walking async-generator ag_await chain #148736
Description
In Lib/asyncio/graph.py, _build_graph_for_future uses coro.cr_frame in the ag_await branch:
elif hasattr(coro, 'ag_await'):
st.append(FrameCallGraphEntry(coro.cr_frame))
coro = coro.ag_awaitAsync generators expose ag_frame, not cr_frame, so this raises AttributeError whenever the walk reaches it. The standard async for path routes through async_generator_asend objects which have neither attribute, so the walker hits the else: break first — which is why the test suite doesn't catch it. A coroutine whose cr_await chains directly to an async-generator-shaped object (duck-typed or manually driven) trips the bug.
Introduced in 1885988 (Jan 2025).
Activity
pythongh-148736: Use ag_frame when walking async generators in asynci…
pythongh-148736: Use ag_frame when walking async generators in asynci…
gh-148736: Use ag_frame when walking async generators in asyncio.graph (
pythongh-148736: Use ag_frame when walking async generators in asynci…