René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Asyncio debugging tools no longer work (`ps` and `pstree`)","articleBody":"# Bug report\n\n### Bug description:\n\nSince GH-142394 the asyncio debugging tools no longer work at all:\n\n```bash\n❯ ./python t.py\n^Z\n[1]+  Stopped                 ./python t.py\n\n❯ jobs -l\n[1]+ 873785 Stopped                 ./python t.py\n\n❯ ./python -m asyncio ps 873785 |\u0026 tail -n 10\n  File \"/home/bswck/Python/cpython/main/Lib/asyncio/tools.py\", line 180, in build_task_table\n    id2name, _, _ = _index(result)\n                    ~~~~~~^^^^^^^^\n  File \"/home/bswck/Python/cpython/main/Lib/asyncio/tools.py\", line 49, in _index\n    internal_stack = [_format_stack_entry(frame) for frame in call_stack]\n                      ~~~~~~~~~~~~~~~~~~~^^^^^^^\n  File \"/home/bswck/Python/cpython/main/Lib/asyncio/tools.py\", line 30, in _format_stack_entry\n    if elem.lineno == 0 and elem.filename == \"\":\n       ^^^^^^^^^^^\nAttributeError: '_remote_debugging.FrameInfo' object has no attribute 'lineno'\n\n❯ ./python -m asyncio pstree 873785 |\u0026 tail -n 10\n  File \"/home/bswck/Python/cpython/main/Lib/asyncio/tools.py\", line 155, in build_async_tree\n    id2name, awaits, task_stacks = _index(result)\n                                   ~~~~~~^^^^^^^^\n  File \"/home/bswck/Python/cpython/main/Lib/asyncio/tools.py\", line 49, in _index\n    internal_stack = [_format_stack_entry(frame) for frame in call_stack]\n                      ~~~~~~~~~~~~~~~~~~~^^^^^^^\n  File \"/home/bswck/Python/cpython/main/Lib/asyncio/tools.py\", line 30, in _format_stack_entry\n    if elem.lineno == 0 and elem.filename == \"\":\n       ^^^^^^^^^^^\nAttributeError: '_remote_debugging.FrameInfo' object has no attribute 'lineno'\n```\n\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-143954\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/johnslavik","@type":"Person","name":"johnslavik"},"datePublished":"2026-01-17T06:44:45.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/143952/cpython/issues/143952"}