github-actions: Add Slack notifications for kernelCI failures by shreeya-patel98 · Pull Request #1217 · ctrliq/kernel-src-tree

shreeya-patel98 · 2026-05-12T20:07:45Z

Notify the #linux-kernel Slack channel when the kernelCI pipeline fails on a supported release branch. Successful runs stay silent.

Triggers a notification:

build / boot failures
kselftest or LTP execution infrastructure failures
kselftest regressions (>±3 test diff vs baseline)
pre-setup / matrix-setup infra failures

Stays silent for:

successful runs
branches whose base is not in VALID_BASES
[skip ci] runs (skip_ci sentinel from pre-setup)
LTP regressions (intentionally not classified — LTP runs informationally per existing pipeline policy: continue-on-error on test-ltp/compare-ltp, no PR-blocking in create-pr)
LTP test failures within tolerance
kselftest pass/fail diffs within ±3 threshold
create-pr failures (avoids noise from branch-name typos, regression-induced skips, transient gh API errors)

Implementation:

notify-slack-kernelci.sh follows the create-pr-body-multiarch.sh pattern: named args, lives in .github/scripts/, fetched fresh from main by the calling workflow on each run.
Posts via slackapi/slack-github-action pinned to SHA 45a88b9581bfab2566dc881e2cd66d334e621e2c (v3.0.3) using the org-wide GH_BOT_SLACK_TOKEN secret.
Channel ID stored as repo variable SLACK_CHANNEL_LINUX_KERNEL so the destination can change without code edits.
Message includes mention, failed-stage summary, and branch/commit/PR/run links.

Prereqs (already in place):

vars.SLACK_CHANNEL_LINUX_KERNEL set on the repo
GH_BOT_SLACK_TOKEN org secret scoped to kernel-src-tree
Bot user is a member of #linux-kernel

Copilot

Pull request overview

Adds automated Slack notifications to the kernelCI multi-arch pipeline so that failures on supported release branches alert the #linux-kernel Slack channel, while successful runs remain silent.

Changes:

Introduces a new notify-slack job in the multi-arch workflow that detects failed stages/regressions and posts a Slack message.
Adds a .github/scripts/notify-slack-kernelci.sh helper to build a chat.postMessage payload consumed by slackapi/slack-github-action.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
.github/workflows/kernel-build-and-test-multiarch.yml	Adds a post-run Slack notification job gated by branch whitelist and failure classification.
.github/scripts/notify-slack-kernelci.sh	New Bash utility to generate the Slack API JSON payload for posting.

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bmastbergen

A couple little things. I think we want to update actions/checkout to 6.0.2 to match our other workflows

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

+          BASE_BRANCH="$KSELFTEST_BASE"
+          [ -z "$BASE_BRANCH" ] && BASE_BRANCH="$LTP_BASE"
+          [ -z "$BASE_BRANCH" ] && BASE_BRANCH="$BASE_REF"
+          if [ -z "$BASE_BRANCH" ] && [[ "$HEAD_REF" =~ \{[^}]+\}[_-](.+) ]]; then
+            BASE_BRANCH="${BASH_REMATCH[1]}"
+          fi
+
+          if ! echo "$VALID_BASES" | grep -wq "$BASE_BRANCH"; then
+            echo "Base '$BASE_BRANCH' not in whitelist — skipping Slack notification"
+            echo "should_notify=false" >> $GITHUB_OUTPUT
+            exit 0


+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --channel-id)              CHANNEL_ID="$2"; shift 2 ;;
+    --base-branch)             BASE_BRANCH="$2"; shift 2 ;;
+    --head-ref)                HEAD_REF="$2"; shift 2 ;;
+    --head-sha)                HEAD_SHA="$2"; shift 2 ;;
+    --pr-number)               PR_NUMBER="$2"; shift 2 ;;
+    --is-pr)                   IS_PR="$2"; shift 2 ;;
+    --repo)                    REPO="$2"; shift 2 ;;
+    --run-id)                  RUN_ID="$2"; shift 2 ;;
+    --failed-stages)           FAILED_STAGES="$2"; shift 2 ;;
+    --mention-id)              MENTION_ID="$2"; shift 2 ;;
+    --output)                  OUTPUT="$2"; shift 2 ;;


Notify the #linux-kernel Slack channel when the kernelCI pipeline fails on a supported release branch. Successful runs stay silent. Triggers a notification: - build / boot failures - kselftest or LTP execution infrastructure failures - kselftest regressions (>±3 test diff vs baseline) - pre-setup / matrix-setup infra failures Stays silent for: - successful runs - branches whose base is not in VALID_BASES - [skip ci] runs (skip_ci sentinel from pre-setup) - LTP regressions (intentionally not classified — LTP runs informationally per existing pipeline policy: continue-on-error on test-ltp/compare-ltp, no PR-blocking in create-pr) - LTP test failures within tolerance - kselftest pass/fail diffs within ±3 threshold - create-pr failures (avoids noise from branch-name typos, regression-induced skips, transient gh API errors) Implementation: - notify-slack-kernelci.sh follows the create-pr-body-multiarch.sh pattern: named args, lives in .github/scripts/, fetched fresh from main by the calling workflow on each run. - Posts via slackapi/slack-github-action pinned to SHA 45a88b9581bfab2566dc881e2cd66d334e621e2c (v3.0.3) using the org-wide GH_BOT_SLACK_TOKEN secret. - Channel ID stored as repo variable SLACK_CHANNEL_LINUX_KERNEL so the destination can change without code edits. - Message includes mention, failed-stage summary, and branch/commit/PR/run links. Prereqs (already in place): - vars.SLACK_CHANNEL_LINUX_KERNEL set on the repo - GH_BOT_SLACK_TOKEN org secret scoped to kernel-src-tree - Bot user is a member of #linux-kernel

PlaidCat · 2026-06-01T15:35:19Z

+          .github/scripts/notify-slack-kernelci.sh \
+            --channel-id "${{ vars.SLACK_CHANNEL_LINUX_KERNEL }}" \
+            --base-branch "${{ steps.decide.outputs.base_branch }}" \
+            --head-ref "${{ steps.decide.outputs.head_ref }}" \


We should sanitize these in decide.outputs or use the same ENV variable patterns as in the decide id step. Apparently these get interpolated exposing the same issue we avoided by using ENV in decide.

I guess this is a uniq issue with GHA and the ${{ ... }} nomenclature.

I would prefer ENV parameters due to the content just being strings in the containing script.

PlaidCat · 2026-06-01T15:36:42Z

+    --repo)                    require_value "$@"; REPO="$2"; shift 2 ;;
+    --run-id)                  require_value "$@"; RUN_ID="$2"; shift 2 ;;
+    --failed-stages)           require_value "$@"; FAILED_STAGES="$2"; shift 2 ;;
+    --mention-id)              require_value "$@"; MENTION_ID="$2"; shift 2 ;;


I assume this is plumbing for later?

Copilot AI review requested due to automatic review settings May 12, 2026 20:07

shreeya-patel98 requested review from PlaidCat, bmastbergen and kerneltoast as code owners May 12, 2026 20:07

shreeya-patel98 self-assigned this May 12, 2026

shreeya-patel98 requested review from a team May 12, 2026 20:08

Copilot started reviewing on behalf of shreeya-patel98 May 12, 2026 20:08 View session

Copilot AI reviewed May 12, 2026

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shreeya-patel98 force-pushed the shreeya_kernelci_slack branch from 9733c62 to be1fd83 Compare May 19, 2026 14:28

bmastbergen reviewed May 19, 2026

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Comment thread .github/workflows/kernel-build-and-test-multiarch.yml Outdated

Comment thread .github/workflows/kernel-build-and-test-multiarch.yml Outdated

Copilot AI review requested due to automatic review settings May 21, 2026 12:20

shreeya-patel98 force-pushed the shreeya_kernelci_slack branch from be1fd83 to a34aeb4 Compare May 21, 2026 12:20

Copilot started reviewing on behalf of shreeya-patel98 May 21, 2026 12:20 View session

Copilot AI reviewed May 21, 2026

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shreeya-patel98 force-pushed the shreeya_kernelci_slack branch from a34aeb4 to 74004a8 Compare May 21, 2026 12:55

PlaidCat reviewed Jun 1, 2026

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github-actions: Add Slack notifications for kernelCI failures#1217

github-actions: Add Slack notifications for kernelCI failures#1217
shreeya-patel98 wants to merge 1 commit into
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