René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"New REPL crash (and terminal display issues) after a breakpoint and by sending Ctrl + D input","articleBody":"# Bug report\n\n### Bug description:\n\nIn a really specific scenario, the terminal can go crazy and becomes unresponsive:\n\nhttps://github.com/user-attachments/assets/d9986c12-aa66-4e3c-bc69-840af79eec95\n\nSteps to reproduce:\n- Create an `issue.py` file, with a breakpoint set (`echo 'breakpoint()' \u003e issue.py`).\n- Run `issue.py` in interactive mode: `python -i issue.py`\n- Press \u003ckbd\u003eC\u003c/kbd\u003e to continue when hitting the breakpoint.\n- Start typing something, e.g. `help(`\n- Input \u003ckbd\u003eCtrl\u003c/kbd\u003e + \u003ckbd\u003eD\u003c/kbd\u003e, as if you wanted to exit the terminal. Nothing happens (as it should).\n- Input \u003ckbd\u003eCtrl\u003c/kbd\u003e + \u003ckbd\u003eC\u003c/kbd\u003e, as if you wanted to clear the line.\n\nIf no breakpoint was hit before, this works as expected:\n\n```python\n\u003e\u003e\u003e help(  # hit Ctrl + D then Ctrl + C\nKeyboardInterrupt\n```\n\nNote trying to reproduce on Python 3.12, the following happens:\n\n```python\n--Return--\n\u003e /home/victorien/ws/pydantic/issue.py(1)\u003cmodule\u003e()-\u003eNone\n-\u003e breakpoint()\n(Pdb) c\n\u003e\u003e\u003e help(  # hit Ctrl + D then Ctrl + C\nProgram interrupted. (Use 'cont' to resume).\n--Return--\n\u003e /home/victorien/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/pdb.py(271)sigint_handler()-\u003eNone\n-\u003e self.set_trace(frame)\n\nTraceback (most recent call last):\n  File \"/home/victorien/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/pdb.py\", line 271, in sigint_handler\n    self.set_trace(frame)\n  File \"/home/victorien/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/bdb.py\", line 94, in trace_dispatch\n    return self.dispatch_return(frame, arg)\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/home/victorien/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/bdb.py\", line 153, in dispatch_return\n    self.user_return(frame, arg)\n  File \"/home/victorien/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/pdb.py\", line 362, in user_return\n    self.interaction(frame, None)\n  File \"/home/victorien/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/pdb.py\", line 428, in interaction\n    self._cmdloop()\n  File \"/home/victorien/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/pdb.py\", line 390, in _cmdloop\n    self.cmdloop()\n  File \"/home/victorien/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/cmd.py\", line 126, in cmdloop\n    line = input(self.prompt)\n           ^^^^^^^^^^^^^^^^^^\nRuntimeError: can't re-enter readline\n\u003e\u003e\u003e \n\n```\n\n### CPython versions tested on:\n\n3.13\n\n### Operating systems tested on:\n\nLinux","author":{"url":"https://github.com/Viicos","@type":"Person","name":"Viicos"},"datePublished":"2025-02-03T12:32:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/129614/cpython/issues/129614"}