feat(kernel): bump to 6.18.39.1, enable TCP BBR3, add kernel update skill - #18528
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Rachel Menge (rlmenge) wants to merge 3 commits into
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feat(kernel): bump to 6.18.39.1, enable TCP BBR3, add kernel update skill#18528Rachel Menge (rlmenge) wants to merge 3 commits into
Rachel Menge (rlmenge) wants to merge 3 commits into
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Introduce a kernel-update agent skill that captures the full workflow for source-version bumps, same-version rebuilds, lock refreshes, render review, build, and mock validation, and wire it into AGENTS.md so it is discoverable alongside the other azldev skills. Rewrite base/comps/kernel/README.rst to describe the local-spec fork point from Fedora dist-git, the version/release macro scheme, the kernel configuration policy, and the editable inputs (including base/comps/kernel/sources for replace-upstream matching). The README now defers to the skill as the authoritative checklist so procedural details live in one place. Guardrails covered by the skill: * update base/comps/kernel/sources alongside kernel.comp.toml when the source version changes; a stale manifest either keeps both archives or fails render with 'no entry with that filename exists'. * only source-version bumps require a coordinated kernel-headers update; same-version rebuilds (config, patch, azl_pkgrelease bump) must not rebump or rebuild kernel-headers. * never describe mock-chroot checks as kernel runtime tests. Signed-off-by: Rachel Menge <rachelmenge@microsoft.com>
Rachel Menge (rlmenge)
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Pull request overview
Updates kernel and kernel-headers to 6.18.39.1, enables modular TCP BBR3, and documents the maintenance workflow.
Changes:
- Updates kernel sources, versions, configurations, locks, and rendered outputs.
- Enables BBR3 on x86_64 and arm64.
- Adds kernel maintenance documentation and an agent skill.
Reviewed changes
Copilot reviewed 20 out of 22 changed files in this pull request and generated 7 comments.
Show a summary per file
| File | Description |
|---|---|
specs/k/kernel/sources |
Updates rendered kernel source checksum. |
specs/k/kernel/README.rst |
Renders the maintenance guide. |
specs/k/kernel/kernel.spec |
Renders version, release, and changelog updates. |
specs/k/kernel/6.18-x86_64-azl.config |
Renders x86_64 BBR3 configuration. |
specs/k/kernel/6.18-aarch64-azl.config |
Renders arm64 configuration updates. |
specs/k/kernel-headers/sources |
Updates rendered headers source checksum. |
specs/k/kernel-headers/kernel-headers.spec |
Renders headers version and static changelog. |
scripts/ci/kernel/kernel-config-checker/kernel_config_checker/kernel_configs_json/azl4-os-required-kernel-configs.json |
Requires modular BBR3 on both architectures. |
locks/kernel.lock |
Refreshes the kernel input fingerprint. |
locks/kernel-headers.lock |
Refreshes the headers input fingerprint. |
base/comps/kernel/sources |
Pins the new kernel archive. |
base/comps/kernel/README.rst |
Documents kernel maintenance. |
base/comps/kernel/kernel.spec |
Updates kernel version, release, and changelog. |
base/comps/kernel/kernel.comp.toml |
Pins the 6.18.39.1 source. |
base/comps/kernel/6.18-x86_64-azl.config |
Enables BBR3 on x86_64. |
base/comps/kernel/6.18-aarch64-azl.config |
Enables BBR3 and new arm64 options. |
base/comps/kernel-headers/overlays/0006-static-changelog.overlay.toml |
Introduces a curated static changelog. |
base/comps/kernel-headers/overlays/0004-use-azl-kernel-tarball-source.overlay.toml |
Updates source descriptions. |
base/comps/kernel-headers/overlays/0001-set-specversion-3-part.overlay.toml |
Updates three-part version replacements. |
base/comps/kernel-headers/kernel-headers.comp.toml |
Pins matching headers inputs. |
AGENTS.md |
Registers the kernel-update skill. |
.agents/skills/kernel-update/SKILL.md |
Adds the kernel update workflow. |
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| replacement = """* Wed Aug 19 2026 Rachel Menge <rachelmenge@microsoft.com> - 6.18.39-1 | ||
| - feat(kernel): update kernel and kernel-headers to 6.18.39.1 | ||
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| * Mon May 18 2026 Rachel Menge <rachelmenge@microsoft.com> - 6.18.31-1 | ||
| - feat(kernel): update kernel and kernel-headers to 6.18.31.1 |
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| 7. In `base/comps/kernel-headers/overlays/0001-set-specversion-3-part.overlay.toml`, | ||
| set both the `specversion` and `tarfile_release` replacements to the same | ||
| three-part `specrpmversion` used by `kernel.spec`. |
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| The kernel source comes from the ``rolling-lts/azl4`` branch of the | ||
| `Azure Linux kernel repository`_. ``kernel.comp.toml`` pins the source archive, |
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| Before acting, read the repository's `AGENTS.md` plus the `azldev`, | ||
| `azldev-build-component`, `azldev-mock`, and | ||
| `azldev-update-component` skills. Read `azldev-comp-toml` before changing | ||
| `kernel.comp.toml`. |
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| 3. Confirm the requested four-part version exists on the | ||
| `rolling-lts/azl4` source branch. Treat a major or minor series change as a | ||
| major version update and obtain explicit user approval. |
| [[overlays]] | ||
| type = "spec-search-replace" | ||
| description = "Replace %autochangelog with a static AZL changelog so renders don't include rpmautospec placeholders or unrelated Fedora dist-git history" | ||
| regex = "%autochangelog" |
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| # expands %autochangelog at render time by walking git history; because | ||
| # the render runs against a staged (non-git) overlay tree, it produces an | ||
| # "Unknown User / Uncommitted changes" placeholder plus the pinned Fedora | ||
| # dist-git history rather than an AZL-relevant log. A static block gives | ||
| # deterministic, meaningful changelog output regardless of the render env. |
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Bumps the Azure Linux kernel and kernel-headers to 6.18.39.1, enables TCP BBR3 as a module (CONFIG_TCP_CONG_BBR3=m on x86_64 + aarch64) and records it in the required-configs manifest as this was added in the source upgrade, and adds a kernel-update skill plus a slimmed README.rst that documents the current update workflow.
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