Read the Docs build information Build id: 3907088 Project: canonical-kernel-docs Version: latest Commit: 5f67f4ed74aaea379cb7453a6005574e3548fd2f Date: 2026-04-08T15:23:03.756172Z State: finished Success: True [rtd-command-info] start-time: 2026-04-08T15:23:04.908181Z, end-time: 2026-04-08T15:23:06.181542Z, duration: 1, exit-code: 0 git clone --depth 1 git@github.com:canonical/kernel-docs.git . Cloning into '.'... Warning: Permanently added 'github.com' (ED25519) to the list of known hosts. [rtd-command-info] start-time: 2026-04-08T15:23:06.293022Z, end-time: 2026-04-08T15:23:07.822876Z, duration: 1, exit-code: 0 git fetch origin --force --prune --prune-tags --depth 50 HEAD Warning: Permanently added 'github.com' (ED25519) to the list of known hosts. From github.com:canonical/kernel-docs * branch HEAD -> FETCH_HEAD [rtd-command-info] start-time: 2026-04-08T15:23:08.817392Z, end-time: 2026-04-08T15:23:08.852076Z, duration: 0, exit-code: 0 cat docs/.readthedocs.yaml # .readthedocs.yaml # Read the Docs configuration file # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details # Required version: 2 # Set the version of Python and other tools you might need build: os: ubuntu-22.04 tools: python: "3.11" jobs: post_checkout: - git fetch --unshallow || true # Cancel building pull requests when there aren't changed in the docs directory. # If there are no changes (git diff exits with 0) we force the command to return with 183. # This is a special exit code on Read the Docs that will cancel the build immediately. # https://docs.readthedocs.io/en/stable/build-customization.html#cancel-build-based-on-a-condition - | if [ "$READTHEDOCS_VERSION_TYPE" = "external" ] && git diff --quiet origin/main -- 'docs/' '.readthedocs.yaml'; then exit 183; fi # Build documentation in the docs/ directory with Sphinx sphinx: builder: dirhtml configuration: docs/conf.py fail_on_warning: true # If using Sphinx, optionally build your docs in additional formats such as PDF formats: - pdf # Optionally declare the Python requirements required to build your docs python: install: - requirements: docs/requirements.txt [rtd-command-info] start-time: 2026-04-08T15:23:08.963688Z, end-time: 2026-04-08T15:23:10.140886Z, duration: 1, exit-code: 0 git fetch --unshallow || true Warning: Permanently added 'github.com' (ED25519) to the list of known hosts. From github.com:canonical/kernel-docs * [new tag] v2024.12.17-01.00 -> v2024.12.17-01.00 [rtd-command-info] start-time: 2026-04-08T15:23:10.252853Z, end-time: 2026-04-08T15:23:10.287392Z, duration: 0, exit-code: 0 if [ "$READTHEDOCS_VERSION_TYPE" = "external" ] && git diff --quiet origin/main -- 'docs/' '.readthedocs.yaml'; then exit 183; fi [rtd-command-info] start-time: 2026-04-08T15:23:15.768584Z, end-time: 2026-04-08T15:23:15.818369Z, duration: 0, exit-code: 0 asdf global python 3.11.12 [rtd-command-info] start-time: 2026-04-08T15:23:16.211002Z, end-time: 2026-04-08T15:23:16.787082Z, duration: 0, exit-code: 0 python -mvirtualenv $READTHEDOCS_VIRTUALENV_PATH created virtual environment CPython3.11.12.final.0-64 in 364ms creator CPython3Posix(dest=/home/docs/checkouts/readthedocs.org/user_builds/canonical-kernel-docs/envs/latest, clear=False, no_vcs_ignore=False, global=False) seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/docs/.local/share/virtualenv) added seed packages: pip==23.1, setuptools==67.6.1, wheel==0.40.0 activators BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator,PythonActivator [rtd-command-info] start-time: 2026-04-08T15:23:16.883381Z, end-time: 2026-04-08T15:23:21.124028Z, duration: 4, exit-code: 0 python -m pip install --upgrade --no-cache-dir pip setuptools Requirement already satisfied: pip in /home/docs/checkouts/readthedocs.org/user_builds/canonical-kernel-docs/envs/latest/lib/python3.11/site-packages (23.1) Collecting pip Downloading pip-26.0.1-py3-none-any.whl (1.8 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.8/1.8 MB 13.2 MB/s eta 0:00:00 Requirement already satisfied: setuptools in /home/docs/checkouts/readthedocs.org/user_builds/canonical-kernel-docs/envs/latest/lib/python3.11/site-packages (67.6.1) Collecting setuptools Downloading setuptools-82.0.1-py3-none-any.whl (1.0 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.0/1.0 MB 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collected packages: urllib3, sphinxcontrib-serializinghtml, sphinxcontrib-qthelp, sphinxcontrib-jsmath, sphinxcontrib-htmlhelp, sphinxcontrib-devhelp, sphinxcontrib-applehelp, snowballstemmer, roman-numerals, Pygments, packaging, MarkupSafe, imagesize, idna, docutils, charset_normalizer, certifi, babel, alabaster, requests, Jinja2, sphinx Successfully installed Jinja2-3.1.6 MarkupSafe-3.0.3 Pygments-2.20.0 alabaster-1.0.0 babel-2.18.0 certifi-2026.2.25 charset_normalizer-3.4.7 docutils-0.22.4 idna-3.11 imagesize-2.0.0 packaging-26.0 requests-2.33.1 roman-numerals-4.1.0 snowballstemmer-3.0.1 sphinx-9.0.4 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 urllib3-2.6.3 [rtd-command-info] start-time: 2026-04-08T15:23:25.601549Z, end-time: 2026-04-08T15:23:33.142026Z, duration: 7, exit-code: 0 python -m pip install --exists-action=w --no-cache-dir -r 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(line 19)) Downloading sphinx_roles-0.1.0-py3-none-any.whl.metadata (1.5 kB) Collecting sphinx-terminal>=1.0.2 (from -r docs/requirements.txt (line 20)) Downloading sphinx_terminal-1.0.3-py3-none-any.whl.metadata (2.9 kB) Collecting sphinx-ubuntu-images>=0.1.0 (from -r docs/requirements.txt (line 21)) Downloading sphinx_ubuntu_images-0.1.0-py3-none-any.whl.metadata (4.5 kB) Collecting sphinx-youtube-links>=0.1.0 (from -r docs/requirements.txt (line 22)) Downloading sphinx_youtube_links-0.1.0-py3-none-any.whl.metadata (1.5 kB) Requirement already satisfied: packaging in /home/docs/checkouts/readthedocs.org/user_builds/canonical-kernel-docs/envs/latest/lib/python3.11/site-packages (from -r docs/requirements.txt (line 25)) (26.0) Collecting sphinx-last-updated-by-git (from -r docs/requirements.txt (line 27)) Downloading sphinx_last_updated_by_git-0.3.8-py3-none-any.whl.metadata (7.1 kB) Collecting sphinx-sitemap (from -r docs/requirements.txt (line 28)) Downloading 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Attempting uninstall: docutils Found existing installation: docutils 0.22.4 Uninstalling docutils-0.22.4: Successfully uninstalled docutils-0.22.4 Attempting uninstall: alabaster Found existing installation: alabaster 1.0.0 Uninstalling alabaster-1.0.0: Successfully uninstalled alabaster-1.0.0 Attempting uninstall: sphinx Found existing installation: Sphinx 9.0.4 Uninstalling Sphinx-9.0.4: Successfully uninstalled Sphinx-9.0.4 Successfully installed GitPython-3.1.46 accessible-pygments-0.0.5 alabaster-0.7.16 anyio-4.13.0 beautifulsoup4-4.14.3 cairocffi-1.7.1 cairosvg-2.9.0 canonical-sphinx-0.6.0 cffi-2.0.0 click-8.3.2 colorama-0.4.6 cssselect2-0.9.0 defusedxml-0.7.1 docutils-0.21.2 furo-2025.12.19 gitdb-4.0.12 h11-0.16.0 linkify-it-py-2.1.0 markdown-it-py-3.0.0 mdit-py-plugins-0.5.0 mdurl-0.1.2 myst-parser-4.0.1 pillow-12.2.0 pycparser-3.0 pyyaml-6.0.3 rst2html-2020.7.4 smmap-5.0.3 soupsieve-2.8.3 sphinx-7.4.7 sphinx-autobuild-2025.8.25 sphinx-basic-ng-1.0.0b2 sphinx-config-options-0.1.1 sphinx-contributor-listing-0.1.0 sphinx-copybutton-0.5.2 sphinx-design-0.7.0 sphinx-filtered-toctree-0.1.0 sphinx-last-updated-by-git-0.3.8 sphinx-notfound-page-1.1.0 sphinx-related-links-0.1.2 sphinx-reredirects-1.1.0 sphinx-roles-0.1.0 sphinx-sitemap-2.9.0 sphinx-tabs-3.5.0 sphinx-terminal-1.0.3 sphinx-ubuntu-images-0.1.0 sphinx-youtube-links-0.1.0 sphinxcontrib-jquery-4.1 sphinxcontrib-svg2pdfconverter-2.1.0 sphinxext-opengraph-0.13.0 starlette-1.0.0 tinycss2-1.5.1 typing-extensions-4.15.0 uc-micro-py-2.0.0 uvicorn-0.44.0 vale-3.13.0.0 watchfiles-1.1.1 webencodings-0.5.1 websockets-16.0 [rtd-command-info] start-time: 2026-04-08T15:23:33.297808Z, end-time: 2026-04-08T15:23:33.332305Z, duration: 0, exit-code: 0 cat docs/conf.py import datetime import ast import os import yaml # Configuration for the Sphinx documentation builder. # All configuration specific to your project should be done in this file. # # If you're new to Sphinx and don't want any advanced or custom features, # just go through the items marked 'TODO'. # # A complete list of built-in Sphinx configuration values: # https://www.sphinx-doc.org/en/master/usage/configuration.html # # Our starter pack uses the custom Canonical Sphinx extension # to keep all documentation based on it consistent and on brand: # https://github.com/canonical/canonical-sphinx ####################### # Project information # ####################### # Project name # # TODO: Update with the official name of your project or product project = "Ubuntu Kernel" author = "Canonical Kernel team" # Sidebar documentation title; best kept reasonably short # # TODO: To include a version number, add it here (hardcoded or automated). # # TODO: To disable the title, set to an empty string. html_title = project + " documentation" # Copyright string; shown at the bottom of the page # # Now, the starter pack uses CC-BY-SA as the license # and the current year as the copyright year. # # TODO: If your docs need another license, specify it instead of 'CC-BY-SA'. # # TODO: If your documentation is a part of the code repository of your project, # it inherits the code license instead; specify it instead of 'CC-BY-SA'. # # NOTE: For static works, it is common to provide the first publication year. # Another option is to provide both the first year of publication # and the current year, especially for docs that frequently change, # e.g. 2022–2023 (note the en-dash). # # A way to check a repo's creation date is to get a classic GitHub token # with 'repo' permissions; see https://github.com/settings/tokens # Next, use 'curl' and 'jq' to extract the date from the API's output: # # curl -H 'Authorization: token ' \ # -H 'Accept: application/vnd.github.v3.raw' \ # https://api.github.com/repos/canonical/ | jq '.created_at' copyright = "%s CC-BY-SA, %s" % (datetime.date.today().year, author) # Documentation website URL # # TODO: Update with the official URL of your docs or leave empty if unsure. # # NOTE: The Open Graph Protocol (OGP) enhances page display in a social graph # and is used by social media platforms; see https://ogp.me/ ogp_site_url = "https://canonical-kernel-docs.readthedocs-hosted.com/" # Preview name of the documentation website # # TODO: To use a different name for the project in previews, update as needed. ogp_site_name = project # Preview image URL # # TODO: To customise the preview image, update as needed. ogp_image = "https://assets.ubuntu.com/v1/253da317-image-document-ubuntudocs.svg" # Product favicon; shown in bookmarks, browser tabs, etc. # TODO: To customise the favicon, uncomment and update as needed. # html_favicon = '.sphinx/_static/favicon.png' # Dictionary of values to pass into the Sphinx context for all pages: # https://www.sphinx-doc.org/en/master/usage/configuration.html#confval-html_context html_context = { # Product page URL; can be different from product docs URL # # TODO: Change to your product website URL, # dropping the 'https://' prefix, e.g. 'ubuntu.com/lxd'. # # TODO: If there's no such website, # remove the {{ product_page }} link from the page header template # (usually .sphinx/_templates/header.html; also, see README.rst). "product_page": "kernel.ubuntu.com", # Product tag image; the orange part of your logo, shown in the page header # # TODO: To add a tag image, uncomment and update as needed. # 'product_tag': '_static/tag.png', # Your Discourse instance URL # # TODO: Change to your Discourse instance URL or leave empty. # # NOTE: If set, adding ':discourse: 123' to an .rst file # will add a link to Discourse topic 123 at the bottom of the page. "discourse": "https://discourse.ubuntu.com/t/ask-us-anything-about-ubuntu-kernels/27664", # Your Mattermost channel URL # # TODO: Change to your Mattermost channel URL or leave empty. "mattermost": "https://chat.canonical.com/canonical/channels/kernel", # Your Matrix channel URL # # TODO: Change to your Matrix channel URL or leave empty. "matrix": "", # Your documentation GitHub repository URL # # TODO: Change to your documentation GitHub repository URL or leave empty. # # NOTE: If set, links for viewing the documentation source files # and creating GitHub issues are added at the bottom of each page. "github_url": "https://github.com/canonical/kernel-docs", # Docs branch in the repo; used in links for viewing the source files # # TODO: To customise the branch, uncomment and update as needed. 'repo_default_branch': 'main', # Docs location in the repo; used in links for viewing the source files # # TODO: To customise the directory, uncomment and update as needed. "repo_folder": "/docs/", # TODO: To enable or disable the Previous / Next buttons at the bottom of pages # Valid options: none, prev, next, both "sequential_nav": "both", # TODO: To enable listing contributors on individual pages, set to True "display_contributors": False, # Required for feedback button 'github_issues': 'enabled', } # Project slug; see https://meta.discourse.org/t/what-is-category-slug/87897 # # TODO: If your documentation is hosted on https://docs.ubuntu.com/, # uncomment and update as needed. # slug = '' ####################### # Sitemap configuration: https://sphinx-sitemap.readthedocs.io/ ####################### # Use RTD canonical URL to ensure duplicate pages have a specific canonical URL html_baseurl = os.environ.get("READTHEDOCS_CANONICAL_URL", "/") # sphinx-sitemap uses html_baseurl to generate the full URL for each page: sitemap_url_scheme = '{link}' # Include `lastmod` dates in the sitemap: sitemap_show_lastmod = True # Exclude generated pages from the sitemap: sitemap_excludes = [ '404/', 'genindex/', 'search/', ] # Template and asset locations html_static_path = [".sphinx/_static"] templates_path = [".sphinx/_templates"] ############# # Redirects # ############# # To set up redirects: https://documatt.gitlab.io/sphinx-reredirects/usage.html # For example: 'explanation/old-name.html': '../how-to/prettify.html', # To set up redirects in the Read the Docs project dashboard: # https://docs.readthedocs.io/en/stable/guides/redirects.html # NOTE: If undefined, set to None, or empty, # the sphinx_reredirects extension will be disabled. redirects = { "reference/patch_acceptance_criteria/index.html": "../patch-acceptance-criteria/", "how-to/develop-customize/": "how-to/", "how-to/develop-customise/": "how-to/", "how-to/source-code/": "how-to/", "how-to/develop-customize/build-kernel/": "how-to/develop-customise/build-kernel/", "how-to/develop-customize/build-kernel-snap/": "how-to/develop-customise/build-kernel-snap/", } ########################### # Link checker exceptions # ########################### # A regex list of URLs that are ignored by 'make linkcheck' # # TODO: Remove or adjust the ACME entry after you update the contributing guide linkcheck_ignore = [ "http://127.0.0.1:8000", "https://github.com/canonical/ACME/*" ] # A regex list of URLs where anchors are ignored by 'make linkcheck' linkcheck_anchors_ignore_for_url = [ r"https://github\.com/.*", r"https://ubuntu.com/about/release-cycle", r"https://snapcraft.io/docs/", ] # give linkcheck multiple tries on failure # linkcheck_timeout = 30 linkcheck_retries = 3 ######################## # Configuration extras # ######################## # Custom MyST syntax extensions; see # https://myst-parser.readthedocs.io/en/latest/syntax/optional.html # # NOTE: By default, the following MyST extensions are enabled: # substitution, deflist, linkify # myst_enable_extensions = set() # Custom Sphinx extensions; see # https://www.sphinx-doc.org/en/master/usage/extensions/index.html # NOTE: The canonical_sphinx extension is required for the starter pack. # It automatically enables the following extensions: # - custom-rst-roles # - myst_parser # - notfound.extension # - related-links # - sphinx_copybutton # - sphinx_design # - sphinx_reredirects # - sphinx_tabs.tabs # - sphinxcontrib.jquery # - sphinxext.opengraph # - terminal-output # - youtube-links extensions = [ "canonical_sphinx", "notfound.extension", "sphinx_design", "sphinx_reredirects", "sphinx_tabs.tabs", "sphinxcontrib.jquery", "sphinxext.opengraph", "sphinx_config_options", "sphinx_contributor_listing", "sphinx_filtered_toctree", "sphinx_related_links", "sphinx_roles", "sphinx_terminal", "sphinx_ubuntu_images", "sphinx_youtube_links", "sphinxcontrib.cairosvgconverter", "sphinx_last_updated_by_git", "sphinx.ext.intersphinx", "sphinx_sitemap", ] # Excludes files or directories from processing #exclude_patterns = [""] # Adds custom CSS files, located under 'html_static_path' html_css_files = [ "cookie-banner.css", ] # Adds custom JavaScript files, located under 'html_static_path' html_js_files = [ "bundle.js", ] # Specifies a reST snippet to be appended to each .rst file rst_epilog = """ .. include:: /reuse/links.txt """ # Feedback button at the top; enabled by default # # TODO: To disable the button, uncomment this. # disable_feedback_button = True # Your manpage URL # # TODO: To enable manpage links, uncomment and update as needed. # # NOTE: If set, adding ':manpage:' to an .rst file # adds a link to the corresponding man section at the bottom of the page. manpages_url = ( "https://manpages.ubuntu.com/manpages/resolute/en/" + "man{section}/{page}.{section}.html" ) # Specifies a reST snippet to be prepended to each .rst file # This defines a :center: role that centers table cell content. # This defines a :h2: role that styles content for use with PDF generation. rst_prolog = """ .. role:: center :class: align-center .. role:: h2 :class: hclass2 .. role:: woke-ignore :class: woke-ignore .. role:: vale-ignore :class: vale-ignore """ # Workaround for https://github.com/canonical/canonical-sphinx/issues/34 if "discourse_prefix" not in html_context and "discourse" in html_context: html_context["discourse_prefix"] = html_context["discourse"] + "/t/" [rtd-command-info] start-time: 2026-04-08T15:23:33.408495Z, end-time: 2026-04-08T15:23:35.611380Z, duration: 2, exit-code: 0 python -m sphinx -T -W --keep-going -b dirhtml -d _build/doctrees -D language=en . $READTHEDOCS_OUTPUT/html Running Sphinx v7.4.7 loading translations [en]... done sphinx_design found. sphinx_design is now configured. sphinx_tabs.tabs found. sphinx_tabs.tabs is now configured. sphinx_reredirects found. sphinx_reredirects is now configured. canonical.youtube-links not found. canonical.youtube-links will not be configured. canonical.related-links not found. canonical.related-links will not be configured. canonical.custom-rst-roles not found. canonical.custom-rst-roles will not be configured. canonical.terminal-output not found. canonical.terminal-output will not be configured. canonical.contributor-listing not found. canonical.contributor-listing will not be configured. sphinx_copybutton found. sphinx_copybutton is now configured. sphinxext.opengraph found. sphinxext.opengraph is now configured. sphinxcontrib.jquery found. sphinxcontrib.jquery is now configured. notfound.extension found. notfound.extension is now configured. sphinxcontrib.cairosvgconverter found. sphinxcontrib.cairosvgconverter is now configured. sphinx_last_updated_by_git found. sphinx_last_updated_by_git is now configured. matplotlib is not installed, social cards will not be generated making output directory... done myst v4.0.1: MdParserConfig(commonmark_only=False, gfm_only=False, enable_extensions={'linkify', 'substitution', 'deflist'}, disable_syntax=[], all_links_external=False, links_external_new_tab=False, url_schemes=('http', 'https', 'mailto', 'ftp'), ref_domains=None, fence_as_directive=set(), number_code_blocks=[], title_to_header=False, heading_anchors=0, heading_slug_func=None, html_meta={}, footnote_sort=True, footnote_transition=True, words_per_minute=200, substitutions={}, linkify_fuzzy_links=True, dmath_allow_labels=True, dmath_allow_space=True, dmath_allow_digits=True, dmath_double_inline=False, update_mathjax=True, mathjax_classes='tex2jax_process|mathjax_process|math|output_area', enable_checkboxes=False, suppress_warnings=[], highlight_code_blocks=True) building [mo]: targets for 0 po files that are out of date writing output... building [dirhtml]: targets for 23 source files that are out of date updating environment: [new config] 23 added, 0 changed, 0 removed reading sources... [ 4%] explanation/index reading sources... [ 9%] explanation/post-release-updates reading sources... [ 13%] explanation/stable-release-updates reading sources... [ 17%] explanation/ubuntu-linux-kernel-sources reading sources... [ 22%] how-to/contribute reading sources... [ 26%] how-to/develop-customise/build-kernel reading sources... [ 30%] how-to/develop-customise/build-kernel-snap reading sources... [ 35%] how-to/index reading sources... [ 39%] how-to/source-code/enable-source-repositories reading sources... [ 43%] how-to/source-code/obtain-kernel-source-git reading sources... [ 48%] how-to/source-code/send-patches reading sources... [ 52%] how-to/testing-verification/test-kernel-in-proposed reading sources... [ 57%] index reading sources... [ 61%] reference/dkms-upload-rights reading sources... [ 65%] reference/glossary reading sources... [ 70%] reference/hwe-kernels reading sources... [ 74%] reference/index reading sources... [ 78%] reference/kernel-upload-rights reading sources... [ 83%] reference/oem-kernels reading sources... [ 87%] reference/patch-acceptance-criteria reading sources... [ 91%] reference/snap-lifecycle reading sources... [ 96%] reference/stable-patch-format reading sources... [100%] reference/ubuntu-kernels getting Git timestamps for source files... [ 14%] explanation getting Git timestamps for source files... [ 29%] how-to getting Git timestamps for source files... [ 43%] how-to/develop-customise getting Git timestamps for source files... [ 57%] how-to/source-code getting Git timestamps for source files... [ 71%] how-to/testing-verification getting Git timestamps for source files... [ 86%] . getting Git timestamps for source files... [100%] reference getting Git timestamps for dependencies... [ 50%] _images getting Git timestamps for dependencies... [100%] reuse looking for now-outdated files... none found pickling environment... done checking consistency... done preparing documents... done copying assets... copying static files... done copying extra files... done copying assets: done writing output... [ 4%] explanation/index writing output... [ 9%] explanation/post-release-updates writing output... [ 13%] explanation/stable-release-updates writing output... [ 17%] explanation/ubuntu-linux-kernel-sources writing output... [ 22%] how-to/contribute writing output... [ 26%] how-to/develop-customise/build-kernel writing output... [ 30%] how-to/develop-customise/build-kernel-snap writing output... [ 35%] how-to/index writing output... [ 39%] how-to/source-code/enable-source-repositories writing output... [ 43%] how-to/source-code/obtain-kernel-source-git writing output... [ 48%] how-to/source-code/send-patches writing output... [ 52%] how-to/testing-verification/test-kernel-in-proposed writing output... [ 57%] index writing output... [ 61%] reference/dkms-upload-rights writing output... [ 65%] reference/glossary writing output... [ 70%] reference/hwe-kernels writing output... [ 74%] reference/index writing output... [ 78%] reference/kernel-upload-rights writing output... [ 83%] reference/oem-kernels writing output... [ 87%] reference/patch-acceptance-criteria writing output... [ 91%] reference/snap-lifecycle writing output... [ 96%] reference/stable-patch-format writing output... [100%] reference/ubuntu-kernels generating indices... genindex done Creating redirect 'reference/patch_acceptance_criteria/index.html' to '../patch-acceptance-criteria/'. Creating redirect 'how-to/develop-customize/index.html' to 'how-to/'. Creating redirect 'how-to/develop-customise/index.html' to 'how-to/'. Creating redirect 'how-to/source-code/index.html' to 'how-to/'. Creating redirect 'how-to/develop-customize/build-kernel/index.html' to 'how-to/develop-customise/build-kernel/'. Creating redirect 'how-to/develop-customize/build-kernel-snap/index.html' to 'how-to/develop-customise/build-kernel-snap/'. writing additional pages... search done copying images... [ 50%] _images/exp-kernel-sru-lifecycle-stages.svg copying images... [100%] _images/ref-hwe-kernel-release-cycle-noble.png dumping search index in English (code: en)... done dumping object inventory... done sphinx-sitemap: sitemap.xml was generated for URL https://canonical-kernel-docs.readthedocs-hosted.com/ in /home/docs/checkouts/readthedocs.org/user_builds/canonical-kernel-docs/checkouts/latest/_readthedocs/html/sitemap.xml build succeeded. The HTML pages are in ../_readthedocs/html. [rtd-command-info] start-time: 2026-04-08T15:23:35.694004Z, end-time: 2026-04-08T15:23:36.945804Z, duration: 1, exit-code: 0 python -m sphinx -T -b latex -d _build/doctrees -D language=en . $READTHEDOCS_OUTPUT/pdf Running Sphinx v7.4.7 loading translations [en]... done sphinx_design found. sphinx_design is now configured. sphinx_tabs.tabs found. sphinx_tabs.tabs is now configured. sphinx_reredirects found. sphinx_reredirects is now configured. canonical.youtube-links not found. canonical.youtube-links will not be configured. canonical.related-links not found. canonical.related-links will not be configured. canonical.custom-rst-roles not found. canonical.custom-rst-roles will not be configured. canonical.terminal-output not found. canonical.terminal-output will not be configured. canonical.contributor-listing not found. canonical.contributor-listing will not be configured. sphinx_copybutton found. sphinx_copybutton is now configured. sphinxext.opengraph found. sphinxext.opengraph is now configured. sphinxcontrib.jquery found. sphinxcontrib.jquery is now configured. notfound.extension found. notfound.extension is now configured. sphinxcontrib.cairosvgconverter found. sphinxcontrib.cairosvgconverter is now configured. sphinx_last_updated_by_git found. sphinx_last_updated_by_git is now configured. matplotlib is not installed, social cards will not be generated making output directory... done loading pickled environment... done myst v4.0.1: MdParserConfig(commonmark_only=False, gfm_only=False, enable_extensions={'deflist', 'substitution', 'linkify'}, disable_syntax=[], all_links_external=False, links_external_new_tab=False, url_schemes=('http', 'https', 'mailto', 'ftp'), ref_domains=None, fence_as_directive=set(), number_code_blocks=[], title_to_header=False, heading_anchors=0, heading_slug_func=None, html_meta={}, footnote_sort=True, footnote_transition=True, words_per_minute=200, substitutions={}, linkify_fuzzy_links=True, dmath_allow_labels=True, dmath_allow_space=True, dmath_allow_digits=True, dmath_double_inline=False, update_mathjax=True, mathjax_classes='tex2jax_process|mathjax_process|math|output_area', enable_checkboxes=False, suppress_warnings=[], highlight_code_blocks=True) building [mo]: targets for 0 po files that are out of date writing output... building [latex]: all documents updating environment: 0 added, 0 changed, 0 removed reading sources... getting Git timestamps for source files... getting Git timestamps for dependencies... looking for now-outdated files... none found copying TeX support files... copying TeX support files... done processing ubuntukernel.tex... index how-to/index how-to/source-code/enable-source-repositories how-to/source-code/obtain-kernel-source-git how-to/source-code/send-patches how-to/develop-customise/build-kernel how-to/develop-customise/build-kernel-snap how-to/testing-verification/test-kernel-in-proposed how-to/contribute reference/index reference/stable-patch-format reference/patch-acceptance-criteria reference/ubuntu-kernels reference/hwe-kernels reference/oem-kernels reference/snap-lifecycle reference/kernel-upload-rights reference/dkms-upload-rights reference/glossary explanation/index explanation/post-release-updates explanation/stable-release-updates explanation/ubuntu-linux-kernel-sources resolving references... done writing... done copying images... [ 50%] _images/ref-hwe-kernel-release-cycle-noble.png copying images... [100%] _images/exp-kernel-sru-lifecycle-stages.svg sphinx-sitemap: No pages generated for sitemap.xml build succeeded. The LaTeX files are in ../_readthedocs/pdf. Run 'make' in that directory to run these through (pdf)latex (use `make latexpdf' here to do that automatically). [rtd-command-info] start-time: 2026-04-08T15:23:37.197555Z, end-time: 2026-04-08T15:23:37.233793Z, duration: 0, exit-code: 0 cat latexmkrc $latex = 'xelatex --no-pdf ' . $ENV{'LATEXOPTS'} . ' %O %S'; $pdflatex = 'xelatex ' . $ENV{'LATEXOPTS'} . ' %O %S'; $lualatex = 'lualatex ' . $ENV{'LATEXOPTS'} . ' %O %S'; $xelatex = 'xelatex --no-pdf ' . $ENV{'LATEXOPTS'} . ' %O %S'; $makeindex = 'internal xindy ' . $ENV{'XINDYOPTS'} . ' %O -o %D %S'; sub xindy { my @args = @_; if (-z $args[-1]) { # create an empty .ind file if .idx is empty open(FH, ">" . $args[-2]); close(FH); return 0; } else { return system("xindy", @args); } } add_cus_dep( "glo", "gls", 0, "makeglo" ); sub makeglo { return system( "makeindex -s gglo.ist -o '$_[0].gls' '$_[0].glo'" ); } [rtd-command-info] start-time: 2026-04-08T15:23:37.324744Z, end-time: 2026-04-08T15:23:48.037971Z, duration: 10, exit-code: 0 latexmk -r latexmkrc -pdf -f -dvi- -ps- -jobname=canonical-kernel-docs -interaction=nonstopmode Use of uninitialized value in concatenation (.) or string at (eval 10) line 1. Use of uninitialized value in concatenation (.) or string at (eval 10) line 2. Use of uninitialized value in concatenation (.) or string at (eval 10) line 3. Use of uninitialized value in concatenation (.) or string at (eval 10) line 4. Use of uninitialized value in concatenation (.) or string at (eval 10) line 5. Subroutine xindy redefined at (eval 11) line 6. Subroutine makeglo redefined at (eval 11) line 18. Use of uninitialized value in concatenation (.) or string at (eval 11) line 1. Use of uninitialized value in concatenation (.) or string at (eval 11) line 2. Use of uninitialized value in concatenation (.) or string at (eval 11) line 3. Use of uninitialized value in concatenation (.) or string at (eval 11) line 4. Use of uninitialized value in concatenation (.) or string at (eval 11) line 5. Rc files read: /etc/LatexMk latexmkrc latexmkrc Latexmk: This is Latexmk, John Collins, 20 November 2021, version: 4.76. Rule 'pdflatex': File changes, etc: Changed files, or newly in use since previous run(s): 'ubuntukernel.tex' ------------ Run number 1 of rule 'pdflatex' ------------ Latexmk: applying rule 'pdflatex'... ------------ Running 'xelatex -interaction=nonstopmode -recorder --jobname="canonical-kernel-docs" "ubuntukernel.tex"' ------------ This is XeTeX, Version 3.141592653-2.6-0.999993 (TeX Live 2022/dev/Debian) (preloaded format=xelatex) restricted \write18 enabled. entering extended mode (./ubuntukernel.tex LaTeX2e <2021-11-15> patch level 1 L3 programming layer <2022-01-21> (./sphinxmanual.cls Document Class: sphinxmanual 2019/12/01 v2.3.0 Document class (Sphinx manual) (/usr/share/texlive/texmf-dist/tex/latex/base/report.cls Document Class: report 2021/10/04 v1.4n Standard LaTeX document class (/usr/share/texlive/texmf-dist/tex/latex/base/size11.clo))) (/usr/share/texlive/texmf-dist/tex/latex/cmap/cmap.sty Package cmap Warning: pdftex not detected - exiting. ) (/usr/share/texlive/texmf-dist/tex/latex/fontspec/fontspec.sty (/usr/share/texlive/texmf-dist/tex/latex/l3packages/xparse/xparse.sty (/usr/share/texlive/texmf-dist/tex/latex/l3kernel/expl3.sty (/usr/share/texlive/texmf-dist/tex/latex/l3backend/l3backend-xetex.def (|extractbb --version)))) (/usr/share/texlive/texmf-dist/tex/latex/fontspec/fontspec-xetex.sty (/usr/share/texlive/texmf-dist/tex/latex/base/fontenc.sty) (/usr/share/texlive/texmf-dist/tex/latex/fontspec/fontspec.cfg))) (/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsmath.sty For additional information on amsmath, use the `?' option. (/usr/share/texlive/texmf-dist/tex/latex/amsmath/amstext.sty (/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsgen.sty)) (/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsbsy.sty) (/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsopn.sty)) (/usr/share/texlive/texmf-dist/tex/latex/amsfonts/amssymb.sty (/usr/share/texlive/texmf-dist/tex/latex/amsfonts/amsfonts.sty)) (/usr/share/texlive/texmf-dist/tex/latex/polyglossia/polyglossia.sty (/usr/share/texlive/texmf-dist/tex/latex/etoolbox/etoolbox.sty) (/usr/share/texlive/texmf-dist/tex/latex/makecmds/makecmds.sty) (/usr/share/texlive/texmf-dist/tex/latex/xkeyval/xkeyval.sty (/usr/share/texlive/texmf-dist/tex/generic/xkeyval/xkeyval.tex (/usr/share/texlive/texmf-dist/tex/generic/xkeyval/xkvutils.tex (/usr/share/texlive/texmf-dist/tex/generic/xkeyval/keyval.tex)))) (/usr/share/texlive/texmf-dist/tex/generic/iftex/iftex.sty) (/usr/share/texlive/texmf-dist/tex/latex/l3packages/l3keys2e/l3keys2e.sty) LaTeX hooks Warning: Generic hook 'file/after/tracklang.sty' is deprecated. (hooks) Use hook 'file/tracklang.sty/after' instead. LaTeX hooks Warning: Generic hook 'package/after/bidi' is deprecated. (hooks) Use hook 'package/bidi/after' instead. LaTeX hooks Warning: Generic hook 'package/after/luabidi' is deprecated. (hooks) Use hook 'package/luabidi/after' instead. 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[56] LaTeX Warning: Hyper reference `reference/patch-acceptance-criteria::doc' on pa ge 57 undefined on input line 5275. LaTeX Warning: Reference `reference/patch-acceptance-criteria::doc' on page 57 undefined on input line 5275. LaTeX Warning: Reference `LastPage' on page 57 undefined on input line 5301. [57] LaTeX Warning: Reference `LastPage' on page 58 undefined on input line 5411. [58] Underfull \hbox (badness 10000) in paragraph at lines 5490--5490 []\TU/FreeSans(0)/m/n/10.95 Authentication Underfull \hbox (badness 7851) in paragraph at lines 5490--5490 []\TU/Ubuntu(0)/m/n/10.95 Public repositories, require Underfull \hbox (badness 10000) in paragraph at lines 5490--5490 []\TU/Ubuntu(0)/m/n/10.95 SSH pro- Underfull \hbox (badness 10000) in paragraph at lines 5490--5490 []\TU/UbuntuMono(0)/m/n/10.95 git clone git+ssh:// Underfull \hbox (badness 10000) in paragraph at lines 5490--5490 []\TU/Ubuntu(0)/m/n/10.95 HTTPS No file canonical-kernel-docs.ind. AED: lastpage setting LastPage LaTeX Warning: Reference `LastPage' on page 59 undefined on input line 5498. [59] Package longtable Warning: Table widths have changed. Rerun LaTeX. (./canonical-kernel-docs.aux) LaTeX Font Warning: Some font shapes were not available, defaults substituted. LaTeX Warning: There were undefined references. LaTeX Warning: Label(s) may have changed. Rerun to get cross-references right. Package rerunfilecheck Warning: File `canonical-kernel-docs.out' has changed. (rerunfilecheck) Rerun to get outlines right (rerunfilecheck) or use package `bookmark'. ) (see the transcript file for additional information) Output written on canonical-kernel-docs.pdf (60 pages). Transcript written on canonical-kernel-docs.log. Latexmk: Index file 'canonical-kernel-docs.idx' was written Latexmk: References changed. Latexmk: Missing input file 'canonical-kernel-docs.ind' (or dependence on it) from following: 'No file canonical-kernel-docs.ind.' Latexmk: References changed. 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page 38 undefined on input line 3112 Reference `explanation/stable-release-updates::doc' on page 54 undefined on input line 5047 Reference `explanation/stable-release-updates:exp-sru-kernel-respins' on page 56 undefined on input line 5196 Reference `explanation/stable-release-updates:sru-cycle-cadence' on page 50 undefined on input line 4736 Reference `explanation/ubuntu-linux-kernel-sources::doc' on page 3 undefined on input line 420 Reference `explanation/ubuntu-linux-kernel-sources::doc' on page 6 undefined on input line 606 Reference `explanation/ubuntu-linux-kernel-sources:exp-ubuntu-kernel-source-protocols' on page 6 undefined on input line 599 Reference `how-to/contribute::doc' on page 5 undefined on input line 483 Reference `how-to/contribute:how-to-contribute-sign-off-commits' on page 19 undefined on input line 1634 Reference `how-to/develop-customise/build-kernel-snap::doc' on page 21 undefined on input line 1839 Reference `how-to/develop-customise/build-kernel-snap::doc' on page 3 undefined on input line 420 Reference `how-to/develop-customise/build-kernel::doc' on page 21 undefined on input line 1835 Reference `how-to/develop-customise/build-kernel::doc' on page 3 undefined on input line 420 Reference `how-to/develop-customise/build-kernel:how-to-build-kernel-install-packages' on page 8 undefined on input line 732 Reference `how-to/develop-customise/build-kernel:how-to-build-kernel-obtain-source' on page 8 undefined on input line 735 Reference `how-to/develop-customise/build-kernel:how-to-build-kernel-setup' on page 8 undefined on input line 731 Reference `how-to/index::doc' on page 4 undefined on input line 453 Reference `how-to/source-code/enable-source-repositories::doc' on page 21 undefined on input line 1815 Reference `how-to/source-code/enable-source-repositories::doc' on page 3 undefined on input line 420 Reference `how-to/source-code/enable-source-repositories::doc' on page 8 undefined on input line 745 Reference 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AED: lastpage setting LastPage [59] (./canonical-kernel-docs.aux) LaTeX Font Warning: Some font shapes were not available, defaults substituted. ) (see the transcript file for additional information) Output written on canonical-kernel-docs.pdf (60 pages). Transcript written on canonical-kernel-docs.log. Latexmk: Index file 'canonical-kernel-docs.idx' was written Latexmk: Missing input file 'canonical-kernel-docs.ind' (or dependence on it) from following: 'No file canonical-kernel-docs.ind.' Latexmk: Log file says output to 'canonical-kernel-docs.pdf' Rule 'pdflatex': File changes, etc: Changed files, or newly in use since previous run(s): 'canonical-kernel-docs.toc' ------------ Run number 3 of rule 'pdflatex' ------------ ------------ Running 'xelatex -interaction=nonstopmode -recorder --jobname="canonical-kernel-docs" "ubuntukernel.tex"' ------------ Latexmk: Examining 'canonical-kernel-docs.log' === TeX engine is 'XeTeX' Latexmk: applying rule 'pdflatex'... 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AED: lastpage setting LastPage [59] (./canonical-kernel-docs.aux) LaTeX Font Warning: Some font shapes were not available, defaults substituted. ) (see the transcript file for additional information) Output written on canonical-kernel-docs.pdf (60 pages). Transcript written on canonical-kernel-docs.log. Latexmk: Index file 'canonical-kernel-docs.idx' was written Latexmk: Missing input file 'canonical-kernel-docs.ind' (or dependence on it) from following: 'No file canonical-kernel-docs.ind.' Latexmk: Log file says output to 'canonical-kernel-docs.pdf' Collected error summary (may duplicate other messages): makeindex canonical-kernel-docs.idx: Command for 'makeindex canonical-kernel-docs.idx' gave return code 256 Refer to 'canonical-kernel-docs.ilg' for details Latexmk: Examining 'canonical-kernel-docs.log' === TeX engine is 'XeTeX' Latexmk: All targets (canonical-kernel-docs.pdf) are up-to-date