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Extraneous error output when process exits after using subinterpreters聽#135729

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Extraneous error output when process exits after using subinterpreters#135729
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3.14bugs and security fixesbugs and security fixes3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixesstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytopic-subinterpreterstype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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@a-reich
a-reich
opened on Jun 19, 2025
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Bug report

Bug description:

I opened an issue earlier on the repo for the PyPI backport, but now that PEP 734 is implemented (馃帀!) I am doing so here.

Reproducer:

>>> from concurrent import interpreters
>>> interp1 = interpreters.create()
>>> interp1.close() # same output occurs without this
>>> exit
Exception ignored while calling deallocator <function Interpreter.__del__ at 0x7308402c8460>:
Traceback (most recent call last):
  File "/usr/lib/python3.14/concurrent/interpreters/__init__.py", line 146, in __del__
  File "/usr/lib/python3.14/concurrent/interpreters/__init__.py", line 162, in _decref
TypeError: catching classes that do not inherit from BaseException is not allowed

I am on release 3.14.0b3 installed as an ubuntu distribution, running on WSL.

CPython versions tested on:

3.14

Operating systems tested on:

Linux

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    3.14bugs and security fixesbugs and security fixes3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixesstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytopic-subinterpreterstype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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