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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Extraneous error output when process exits after using subinterpreters","articleBody":"# Bug report\n\n### Bug description:\n\nI opened an [issue](https://github.com/ericsnowcurrently/interpreters/issues/22) earlier on the repo for the PyPI backport, but now that PEP 734 is implemented (🎉!) I am doing so here.\n\nReproducer:\n```python\n\u003e\u003e\u003e from concurrent import interpreters\n\u003e\u003e\u003e interp1 = interpreters.create()\n\u003e\u003e\u003e interp1.close() # same output occurs without this\n\u003e\u003e\u003e exit\nException ignored while calling deallocator \u003cfunction Interpreter.__del__ at 0x7308402c8460\u003e:\nTraceback (most recent call last):\n  File \"/usr/lib/python3.14/concurrent/interpreters/__init__.py\", line 146, in __del__\n  File \"/usr/lib/python3.14/concurrent/interpreters/__init__.py\", line 162, in _decref\nTypeError: catching classes that do not inherit from BaseException is not allowed\n```\nI am on release 3.14.0b3 installed as an ubuntu distribution, running on WSL.\n\n### CPython versions tested on:\n\n3.14\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-139104\n* gh-139112\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/a-reich","@type":"Person","name":"a-reich"},"datePublished":"2025-06-19T19:13:19.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/135729/cpython/issues/135729"}