autodoc: cannot import name 'mock' from 'sphinx.ext.autodoc' #14142
Description
Describe the bug
I'm seeing the below error running sphinx. All the relevant info should be part of the log.
How to Reproduce
Running Sphinx v9.0.1
loading translations [python]... not available for built-in messages
Extension error!
Versions
========
* Platform: linux; (Linux-6.17.0-6-generic-x86_64-with-glibc2.39)
* Python version: 3.12.3 (CPython)
* Sphinx version: 9.0.1
* Docutils version: 0.22.3
* Jinja2 version: 3.1.6
* Pygments version: 2.19.2
Last Messages
=============
None.
Loaded Extensions
=================
None.
Traceback
=========
File "/home/user/.local/lib/python3.12/site-packages/sphinx/registry.py", line 546, in load_extension
raise ExtensionError(
sphinx.errors.ExtensionError: Could not import extension sphinxarg.ext (exception: cannot import name 'mock' from 'sphinx.ext.autodoc' (/home/user/.local/lib/python3.12/site-packages/sphinx/ext/autodoc/__init__.py))
The full traceback has been saved in:
/tmp/sphinx-err-i2e2sw7c.log
To report this error to the developers, please open an issue at <https://github.com/sphinx-doc/sphinx/issues/>. Thanks!
Please also report this if it was a user error, so that a better error message can be provided next time.
and just for completeness:
user@nemo:~/srcdir$ pip list | grep sphinx
sphinx-argparse 0.5.2
sphinxcontrib-applehelp 2.0.0
sphinxcontrib-devhelp 2.0.0
sphinxcontrib-htmlhelp 2.1.0
sphinxcontrib-jsmath 1.0.1
sphinxcontrib-qthelp 2.0.0
sphinxcontrib-serializinghtml 2.0.0
Environment Information
I'm running this in an ubuntu 24.04 container, with
Platform: linux; (Linux-6.17.0-6-generic-x86_64-with-glibc2.39)
Python version: 3.12.3 (main, Nov 6 2025, 13:44:16) [GCC 13.3.0])
Python implementation: CPython
Sphinx version: 9.0.1
Docutils version: 0.22.3
Jinja2 version: 3.1.6
Pygments version: 2.19.2
Sphinx extensions
Additional context
No response