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Asyncio debugging tools no longer work (ps and pstree) #143952
Description
Bug report
Bug description:
Since GH-142394 the asyncio debugging tools no longer work at all:
❯ ./python t.py
^Z
[1]+ Stopped ./python t.py
❯ jobs -l
[1]+ 873785 Stopped ./python t.py
❯ ./python -m asyncio ps 873785 |& tail -n 10
File "/home/bswck/Python/cpython/main/Lib/asyncio/tools.py", line 180, in build_task_table
id2name, _, _ = _index(result)
~~~~~~^^^^^^^^
File "/home/bswck/Python/cpython/main/Lib/asyncio/tools.py", line 49, in _index
internal_stack = [_format_stack_entry(frame) for frame in call_stack]
~~~~~~~~~~~~~~~~~~~^^^^^^^
File "/home/bswck/Python/cpython/main/Lib/asyncio/tools.py", line 30, in _format_stack_entry
if elem.lineno == 0 and elem.filename == "":
^^^^^^^^^^^
AttributeError: '_remote_debugging.FrameInfo' object has no attribute 'lineno'
❯ ./python -m asyncio pstree 873785 |& tail -n 10
File "/home/bswck/Python/cpython/main/Lib/asyncio/tools.py", line 155, in build_async_tree
id2name, awaits, task_stacks = _index(result)
~~~~~~^^^^^^^^
File "/home/bswck/Python/cpython/main/Lib/asyncio/tools.py", line 49, in _index
internal_stack = [_format_stack_entry(frame) for frame in call_stack]
~~~~~~~~~~~~~~~~~~~^^^^^^^
File "/home/bswck/Python/cpython/main/Lib/asyncio/tools.py", line 30, in _format_stack_entry
if elem.lineno == 0 and elem.filename == "":
^^^^^^^^^^^
AttributeError: '_remote_debugging.FrameInfo' object has no attribute 'lineno'CPython versions tested on:
CPython main branch
Operating systems tested on:
No response
Activity
[-]Asyncio tools no longer work (`ps` and `pstree`)[/-][+]Asyncio debugging tools no longer work (`ps` and `pstree`)[/+]kumaraditya303 commentedon Jan 17, 2026
I am surprised that we do not have any tests for it, we should definitely add tests.
johnslavik commentedon Jan 17, 2026
Hm, I've gotten confused. We do have tests for tools.
gh-143952: Fix asyncio tools to work with the new remote debugging API (
pythongh-143952: Fix asyncio tools to work with the new remote debugg…
pythongh-143955: Use _remote_debugging structs directly in test_tools