cc also @JulienPalard

Ohhh that's why the number of build errors suspiciously went to 0 on Sentry... it raised a flag in my mind to check it (but I was on holidays...).

I see it now! There's a sphinx-build process stuck since the 26 Apr:

docsbui+ 18192  0.0  1.3 170376 111780 ?       S    Apr26   0:16                                  \_ /srv/docsbuild/venv-with-sphinx-3.2.1/bin/python /srv/docsbuild/venv-with-sphinx-3.2.1/bin/sphinx-build -b html -d build/doctrees -D latex_engine=xelatex -D latex_elements.inputenc= -D latex_elements.fontenc=\usepackage{xeCJK} -j4 -q -D locale_dirs=/srv/docsbuild/3.10/locale -D language=zh_TW -D gettext_compact=0 -Ea -A daily=1 . build/html

Killing it and keeping an eye on it... I'll try to diagnose if it happen again. It looks related to Sphinx parallelisation (main process were waiting for the child while the child was trying to write on a pipe, maybe to the main process).

Closing it, as I don't feel the need to investigate as long as it does not reproduce, feel free to reopen if it happen agian.

I'll monitor the builds closely today and tomorrow as we've added Python 3.12 yesterday.

Thank you for fixing the job.