PS-10595 [8.4]: Lazy initialization for buffer pool block latches #152

Workflow file for this run

	# PS-11078: GitHub Actions build for percona-server 8.4 on Hetzner cax* arm64.
	# Replaces the Cirrus arm64 tasks before Cirrus shuts down 2026-06-01.
	#
	# PS-11179 (2026-05-28): AWS Graviton fallback path added. Hetzner remains the
	# primary provider; if the cax41/cax31/cax21 sweep across fsn1/hel1/nbg1 fails
	# repeatedly, pick-target switches provider to "aws" and create-runner-aws
	# provisions a c7g.4xlarge Graviton3 spot (with on-demand fallback) in
	# eu-central-1. Build steps are unchanged; only the runner provisioning path
	# branches.
	#
	# One file, three event paths (BUILD_TYPE + MTR_SUITE picked by `dispatch` job):
	# - pull_request to 8.4 -> Debug + MTR main.1st (same-repo PRs; Cirrus per-PR replacement)
	# - pull_request_target to 8.4 -> Debug + MTR main.1st (PS-11254: fork PRs by percona org members only)
	# - workflow_dispatch -> manual run OR nightly (build_type RelWithDebInfo -> binlog_nogtid)
	#
	# Nightly RelWithDebInfo + binlog_nogtid is NOT a `schedule:` trigger here:
	# GHA cron only fires from the DEFAULT branch, so a cron in this file would be
	# dead on every non-default branch (e.g. 9.7). Instead .github/workflows/
	# builds-nightly.yml lives on the default branch and dispatches THIS file via
	# workflow_dispatch --ref on each maintained branch, so each nightly runs that
	# branch's own self-contained builds.yml (its boost version, cmake/apt deltas).
	#
	# Notes for follow-ups (per Przemek DM 2026-05-27):
	# - This file lives on the 8.4 branch. The 9.7 branch carries the same
	# shape; per-branch deltas are the parent branch, boost version, and any
	# cmake/apt differences.
	# - x86_64 nightly RelWithDebInfo can be added as a sibling job reusing the
	# `dispatch` outputs (BUILD_TYPE / MTR_SUITE / CCACHE_MAXSIZE). Intentionally
	# not wired in this PR per "we may do it, let's see how arm64 behaves first".
	#
	# Trust split: pick-target / create-runner-* / delete-runner-* hold infra
	# secrets (GHA_RUNNER_HCLOUD_TOKEN, GHA_RUNNER_PAT, AWS_ROLE_ARN via OIDC).
	# The build-arm64 job runs on the ephemeral runner (Hetzner OR EC2) and only
	# sees GITHUB_TOKEN (read-only), so PR code never reaches infra credentials.
	#
	# PS-11254: fork PRs run via pull_request_target so the provisioning jobs
	# resolve secrets in base-repo context. This is safe ONLY because the
	# secret-bearing jobs do NO checkout; build-arm64 is the sole job that checks
	# out PR code, and it holds no secrets. The `dispatch` gate limits
	# pull_request_target to fork PRs whose author is a percona org member
	# (author_association MEMBER/OWNER/COLLABORATOR). INVARIANT: never add a PR-code
	# checkout to a secret-bearing job.

	name: builds

	on:
	workflow_dispatch:
	inputs:
	build_type:
	description: 'Build type'
	type: choice
	options:
	- Debug
	- RelWithDebInfo
	default: Debug
	debug_keep_vm:
	description: 'On create-runner failure: keep Hetzner VM alive so you can SSH in and grab /var/log/cloud-init-output.log + /actions-runner/_diag/* manually. SSH as root using key 107239874 (anderson@percona). Remember to delete the VM when done. (Hetzner path only; EC2 fallback always terminates.)'
	type: boolean
	default: false
	force_provider:
	description: 'Override provider selection (debug + cost benchmarking). "auto" = Hetzner with EC2 fallback (default, production behavior). "hetzner" = Hetzner only, fail if exhausted (no AWS spend). "aws" = skip Hetzner, go straight to EC2 (validate AWS path on demand without waiting for a real Hetzner outage).'
	type: choice
	options:
	- auto
	- hetzner
	- aws
	default: auto
	pull_request:
	branches: [8.4]
	paths-ignore:
	# Mirrors azure-pipelines.yml `paths.exclude`.
	- 'doc/**'
	- 'build-ps/**'
	- 'man/**'
	- 'mysql-test/**'
	- 'packaging/**'
	- 'policy/**'
	- 'scripts/**'
	- 'support-files/**'
	pull_request_target:
	# PS-11254: fork PRs get no secrets on `pull_request` (GitHub withholds
	# them from forks), so org-member fork PRs run here in base-repo context,
	# gated by `dispatch` below. Same-repo PRs stay on `pull_request`.
	branches: [8.4]
	paths-ignore:
	- 'doc/**'
	- 'build-ps/**'
	- 'man/**'
	- 'mysql-test/**'
	- 'packaging/**'
	- 'policy/**'
	- 'scripts/**'
	- 'support-files/**'

	concurrency:
	# PR runs (pull_request + pull_request_target) are cancellable so superseded
	# pushes do not waste Hetzner cycles; workflow_dispatch runs (including the
	# nightly dispatched from the default branch) stay protected
	# (cancel-in-progress: false) because they bill paid arm64 minutes.
	# event_name is in the key so a fork PR's (skipped) pull_request run and its
	# real pull_request_target run do not share a group.
	group: build-${{ github.event_name }}-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: ${{ github.event_name == 'pull_request' \|\| github.event_name == 'pull_request_target' }}

	# Workflow-level permissions are minimal (contents: read) to limit blast
	# radius for any future jobs added here. The id-token: write grant required
	# for OIDC -> AWS STS federation lives only on the two jobs that actually
	# use it (create-runner-aws, delete-runner-aws). build-arm64 runs untrusted
	# PR code on the ephemeral runner and intentionally does not get id-token.
	permissions:
	contents: read

	env:
	PARENT_BRANCH: '8.4'
	BUILD_PARAMS_TYPE: normal
	COMPILER: gcc
	COMPILER_VER: ''
	IMAGE_NAME: ubuntu-26.04
	UBUNTU_CODE_NAME: resolute
	BOOST_VERSION: boost_1_84_0
	USE_CCACHE: '1'
	CCACHE_COMPRESS: '1'
	CCACHE_COMPRESSLEVEL: '9'
	CCACHE_CPP2: '1'
	IMAGE: ubuntu-26.04
	SSH_KEY_ID: '107239874'
	EPHEMERAL_RUNNER_NAME: ps-arm64-${{ github.run_id }}-${{ github.run_attempt }}
	# PS-11179: EC2 fallback knobs. eu-central-1 chosen to match the existing
	# Jenkins eu-central-1 footprint (low latency to EU contributors, no new
	# cross-region S3/ECR traffic for boost / ccache restore). c7g.4xlarge gives
	# 16 vCPU + 32 GB Graviton3, which is parity with the cax41 default.
	AWS_REGION: eu-central-1
	AWS_INSTANCE_TYPE: c7g.4xlarge

	jobs:
	# TRUSTED authorization gate (PS-11254). Root of the job graph: dispatch
	# needs it and every other job chains off dispatch, so gating here gates the
	# whole run.
	# - schedule / workflow_dispatch: always
	# - pull_request: same-repo PRs only (forks get no secrets on this event)
	# - pull_request_target: fork PRs only, authorized when the PR author has
	# write+ access to the repo. author_association is deliberately NOT used:
	# its value in the event payload is CONTRIBUTOR for PRIVATE percona org
	# members, so it would wrongly reject them. The repo-permission API call
	# via GHA_RUNNER_PAT is reliable (empirically confirmed: members resolve
	# to write, non-collaborators to read on this public repo). This job does
	# no checkout and runs in base-repo context, so the trust split holds.
	authorize:
	runs-on: ubuntu-latest
	permissions: {}
	outputs:
	ok: ${{ steps.gate.outputs.ok }}
	steps:
	- id: gate
	env:
	GH_TOKEN: ${{ secrets.GHA_RUNNER_PAT }}
	EVENT: ${{ github.event_name }}
	HEAD_REPO: ${{ github.event.pull_request.head.repo.full_name }}
	BASE_REPO: ${{ github.repository }}
	AUTHOR: ${{ github.event.pull_request.user.login }}
	run: \|
	set -u
	ok=false
	case "$EVENT" in
	schedule\|workflow_dispatch)
	ok=true ;;
	pull_request)
	[ "$HEAD_REPO" = "$BASE_REPO" ] && ok=true ;;
	pull_request_target)
	if [ "$HEAD_REPO" != "$BASE_REPO" ]; then
	perm=$(curl -s -H "Authorization: Bearer $GH_TOKEN" \
	-H "Accept: application/vnd.github+json" \
	"https://api.github.com/repos/$BASE_REPO/collaborators/$AUTHOR/permission" \
	\| jq -r '.permission // "none"' 2>/dev/null \|\| echo none)
	case "$perm" in admin\|maintain\|write) ok=true ;; esac
	echo "::notice::fork PR by $AUTHOR; repo permission=$perm -> authorized=$ok"
	fi ;;
	esac
	echo "ok=$ok" >> "$GITHUB_OUTPUT"

	# TRUSTED. Pick BUILD_TYPE + MTR suite + cache size based on event.
	dispatch:
	needs: authorize
	if: needs.authorize.outputs.ok == 'true'
	runs-on: ubuntu-latest
	permissions: {}
	outputs:
	build_type: ${{ steps.pick.outputs.build_type }}
	mtr_suite: ${{ steps.pick.outputs.mtr_suite }}
	ccache_maxsize: ${{ steps.pick.outputs.ccache_maxsize }}
	steps:
	- id: pick
	run: \|
	set -eu
	case "${{ github.event_name }}" in
	pull_request\|pull_request_target)
	BT=Debug; SUITE=main.1st; CACHE=4G
	;;
	workflow_dispatch)
	# Manual runs AND the nightly dispatcher (builds-nightly.yml on
	# the default branch) land here. build_type=RelWithDebInfo ->
	# binlog_nogtid (Cirrus nightly parity, Przemek 2026-05-18);
	# build_type=Debug -> main.1st.
	BT="${{ inputs.build_type }}"
	if [ "$BT" = "Debug" ]; then
	SUITE=main.1st; CACHE=4G
	else
	SUITE=binlog_nogtid; CACHE=8G
	fi
	;;
	esac
	echo "Event ${{ github.event_name }} -> BUILD_TYPE=$BT, MTR=$SUITE, CCACHE_MAXSIZE=$CACHE" >> "$GITHUB_STEP_SUMMARY"
	{
	echo "build_type=$BT"
	echo "mtr_suite=$SUITE"
	echo "ccache_maxsize=$CACHE"
	} >> "$GITHUB_OUTPUT"

	# TRUSTED. Dynamic capacity probe with PS-11179 fallback wiring.
	#
	# Sweep == one full pass over the 9 (server_type, dc) combinations
	# (cax41/cax31/cax21 × fsn1/hel1/nbg1), each combination probed via the
	# existing POST-then-DELETE pattern (HTTP 201 == we could have created the
	# VM, so we have capacity; delete and report the (type, dc) back to
	# create-runner-hetzner).
	#
	# On a fully-saturated Hetzner arm64 fleet we retry 4 sweeps total
	# (1 initial + 3 retries) with backoff 2/5/10 minutes between attempts.
	# Total wait before EC2 fallback fires:
	# 2 + 5 + 10 = 17 min.
	# The original 9-sweep / ~3h7m curve was agreed with Przemyslaw DM
	# 2026-05-28; PS-11254 shortened it so the AWS Graviton fallback takes
	# over fast on a real capacity outage instead of leaving a PR without
	# arm64 feedback for ~3h. Early retries still catch the common short dips.
	#
	# Implemented as a single bash loop in this single job so the workflow
	# graph stays linear (no matrix x retries explosion in the UI).
	#
	# Outputs:
	# provider "hetzner" (normal) or "aws" (all sweeps exhausted)
	# location hetzner location (fsn1/hel1/nbg1) if provider=hetzner; "" otherwise
	# server_type hetzner server type (cax41/cax31/cax21) if provider=hetzner; "" otherwise
	pick-target:
	needs: dispatch
	runs-on: ubuntu-latest
	permissions: {}
	# PS-11254: 4 sweeps × backoff totals ~17m of sleeps plus 36 HTTP
	# round-trips (~2 min worst-case) plus job overhead. 30 min leaves
	# headroom for slow Hetzner API responses without auto-cancelling.
	timeout-minutes: 30
	outputs:
	provider: ${{ steps.probe.outputs.provider }}
	location: ${{ steps.probe.outputs.location }}
	server_type: ${{ steps.probe.outputs.server_type }}
	steps:
	- id: probe
	env:
	HCLOUD_TOKEN: ${{ secrets.GHA_RUNNER_HCLOUD_TOKEN }}
	FORCE_PROVIDER: ${{ github.event_name == 'workflow_dispatch' && inputs.force_provider \|\| 'auto' }}
	run: \|
	set -euo pipefail

	# PS-11179: force_provider override (workflow_dispatch only; defaults
	# to "auto" for pull_request / pull_request_target, and for the nightly
	# dispatched as workflow_dispatch). Lets operators validate the
	# EC2 path on demand without waiting for a real Hetzner outage, or
	# pin to Hetzner-only when AWS spend must be avoided.
	case "$FORCE_PROVIDER" in
	aws)
	echo "::notice::force_provider=aws -> skipping Hetzner probing, going straight to EC2 fallback"
	echo "### Provider override: AWS (forced via workflow_dispatch input)" >> "$GITHUB_STEP_SUMMARY"
	{
	echo "provider=aws"
	echo "location="
	echo "server_type="
	} >> "$GITHUB_OUTPUT"
	exit 0
	;;
	hetzner)
	echo "::notice::force_provider=hetzner -> EC2 fallback disabled; will fail if Hetzner exhausted"
	;;
	auto)
	;;
	*)
	echo "::error::Unrecognised force_provider value: $FORCE_PROVIDER (expected auto\|hetzner\|aws)"
	exit 1
	;;
	esac

	# PS-11179: backoff curve in minutes between sweep attempts.
	# Index 0 is the gap AFTER sweep 1 fails (before sweep 2), etc.
	# PS-11254: 3 entries == 3 retries after the initial sweep == 4 sweeps
	# total (~17m: 2+5+10), so the AWS EC2 fallback takes over fast instead
	# of burning ~3h on a Hetzner capacity outage.
	BACKOFF_MIN=(2 5 10)
	MAX_SWEEPS=4

	for sweep in $(seq 1 "$MAX_SWEEPS"); do
	echo "::group::Hetzner capacity sweep $sweep/$MAX_SWEEPS"
	for type in cax41 cax31 cax21; do
	for dc in fsn1 hel1 nbg1; do
	PROBE_NAME="cap-probe-${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT}-s${sweep}-${type}-${dc}"
	HTTP=$(curl -sS -o /tmp/resp.json -w "%{http_code}" -X POST \
	-H "Authorization: Bearer $HCLOUD_TOKEN" -H "Content-Type: application/json" \
	https://api.hetzner.cloud/v1/servers \
	-d "{\"name\":\"$PROBE_NAME\",\"server_type\":\"$type\",\"image\":\"$IMAGE\",\"location\":\"$dc\",\"start_after_create\":false}")
	if [ "$HTTP" = "201" ]; then
	ID=$(jq -r '.server.id // empty' /tmp/resp.json)
	[ -n "$ID" ] \|\| { echo "::error::201 without server id"; exit 1; }
	curl -fsS -X DELETE -H "Authorization: Bearer $HCLOUD_TOKEN" \
	"https://api.hetzner.cloud/v1/servers/$ID" >/dev/null
	if [ "$type" != "cax41" ]; then
	echo "::warning::cax41 unavailable (PS-11174); falling back to $type in $dc"
	fi
	if [ "$sweep" -gt 1 ]; then
	echo "::notice::Hetzner capacity recovered on sweep $sweep"
	fi
	echo "Hetzner target: $type in $dc (sweep $sweep/$MAX_SWEEPS)" >> "$GITHUB_STEP_SUMMARY"
	{
	echo "provider=hetzner"
	echo "location=$dc"
	echo "server_type=$type"
	} >> "$GITHUB_OUTPUT"
	echo "::endgroup::"
	exit 0
	fi
	ERR=$(jq -r '.error.code // "?"' /tmp/resp.json 2>/dev/null \|\| echo "?")
	echo "::warning::sweep $sweep: $type/$dc: HTTP $HTTP ($ERR)"
	done
	done
	echo "::endgroup::"

	# Sleep before the next sweep unless this was the last one.
	if [ "$sweep" -lt "$MAX_SWEEPS" ]; then
	idx=$((sweep - 1))
	wait_min="${BACKOFF_MIN[$idx]}"
	echo "::notice::All 9 Hetzner combos exhausted on sweep $sweep; sleeping ${wait_min}m before sweep $((sweep + 1))"
	sleep $((wait_min * 60))
	fi
	done

	# PS-11179: All sweeps exhausted; switch to EC2 path (unless
	# force_provider=hetzner explicitly disabled fallback).
	if [ "$FORCE_PROVIDER" = "hetzner" ]; then
	echo "::error::Hetzner CAX exhausted after $MAX_SWEEPS sweeps AND force_provider=hetzner; failing per request"
	exit 1
	fi
	echo "::warning::Hetzner CAX capacity exhausted after $MAX_SWEEPS sweeps (~17m wall time); falling back to AWS EC2 c7g.4xlarge in $AWS_REGION"
	{
	echo "### EC2 fallback fired (PS-11179)"
	echo ""
	echo "Hetzner cax41/cax31/cax21 across fsn1/hel1/nbg1 had no capacity"
	echo "across $MAX_SWEEPS sweeps spanning ~17m. Falling back to AWS"
	echo "EC2 c7g.4xlarge (Graviton3) in eu-central-1."
	} >> "$GITHUB_STEP_SUMMARY"
	{
	echo "provider=aws"
	echo "location="
	echo "server_type="
	} >> "$GITHUB_OUTPUT"

	# TRUSTED. Provision the ephemeral Hetzner runner. Runs only when
	# pick-target found Hetzner capacity.
	#
	# Renamed from `create-runner` to `create-runner-hetzner` in PS-11179 so the
	# AWS sibling job can live alongside it. Body otherwise unchanged.
	create-runner-hetzner:
	needs: [dispatch, pick-target]
	if: needs.pick-target.outputs.provider == 'hetzner'
	runs-on: ubuntu-latest
	permissions: {}
	outputs:
	runner_label: ${{ env.EPHEMERAL_RUNNER_NAME }}
	server_id: ${{ steps.create.outputs.server_id }}
	server_type: ${{ needs.pick-target.outputs.server_type }}
	steps:
	- id: create
	uses: olexandr-havryliak/hcloud-github-runner@bb1089d8b718a06493cb37c51dfe596e44baefc2
	with:
	mode: create
	name: ${{ env.EPHEMERAL_RUNNER_NAME }}
	hcloud_token: ${{ secrets.GHA_RUNNER_HCLOUD_TOKEN }}
	github_token: ${{ secrets.GHA_RUNNER_PAT }}
	image: ${{ env.IMAGE }}
	location: ${{ needs.pick-target.outputs.location }}
	server_type: ${{ needs.pick-target.outputs.server_type }}
	ssh_key: ${{ env.SSH_KEY_ID }}
	# Default budget is 60x10s = 10 min; bumped to 20 min absorbs transient
	# apt-mirror or GitHub-release slowness during bootstrap.
	runner_wait: '120'
	# Retry apt with backoff for transient apt-mirror hiccups on first
	# cloud-init (Codex diagnosis 2026-05-22).
	pre_runner_script: \|
	set -euxo pipefail
	export DEBIAN_FRONTEND=noninteractive
	ok=0
	for i in 1 2 3; do
	if apt-get update -y && apt-get install -y --no-install-recommends curl ca-certificates jq; then
	ok=1
	break
	fi
	sleep $((i * 15))
	done
	[ "$ok" = 1 ]

	# On create-runner failure with workflow_dispatch `debug_keep_vm` set,
	# surface VM IP + SSH instructions in the run summary BEFORE delete-runner
	# reaps the VM. Anderson SSHs in manually with his personal key
	# (107239874) to grab cloud-init logs and the runner _diag dir.
	- name: Preserve VM for manual diagnosis (on failure, debug-only)
	if: failure() && inputs.debug_keep_vm == true
	env:
	HCLOUD_TOKEN: ${{ secrets.GHA_RUNNER_HCLOUD_TOKEN }}
	SERVER_ID: ${{ steps.create.outputs.server_id }}
	run: \|
	set -euo pipefail
	[ -n "${SERVER_ID:-}" ] \|\| { echo "::warning::No server_id; nothing to preserve"; exit 0; }
	IP=$(curl -fsS -H "Authorization: Bearer $HCLOUD_TOKEN" \
	"https://api.hetzner.cloud/v1/servers/$SERVER_ID" \
	\| jq -r '.server.public_net.ipv4.ip')
	{
	echo "### Debug VM kept alive for manual diagnosis"
	echo ""
	echo "Server ID: \`$SERVER_ID\`"
	echo "Public IPv4: \`$IP\`"
	echo ""
	echo "SSH (key 107239874, \`anderson@percona\`):"
	echo "\`\`\`bash"
	echo "ssh root@$IP"
	echo "\`\`\`"
	echo ""
	echo "Files to grab:"
	echo "- \`/var/log/cloud-init.log\`"
	echo "- \`/var/log/cloud-init-output.log\`"
	echo "- \`/actions-runner/_diag/\` (if it exists)"
	echo "- \`/actions-runner/.runner\` + \`.credentials\` (if registration partially completed)"
	echo ""
	echo "Cleanup when done:"
	echo "\`\`\`bash"
	echo "curl -X DELETE -H \"Authorization: Bearer \$HCLOUD_TOKEN\" \\"
	echo " https://api.hetzner.cloud/v1/servers/$SERVER_ID"
	echo "\`\`\`"
	echo ""
	echo "orphan-sweep.yml will reap this VM after 6h regardless."
	} >> "$GITHUB_STEP_SUMMARY"

	# TRUSTED. Provision the ephemeral EC2 runner (PS-11179 fallback path).
	# Runs only when pick-target exhausted Hetzner.
	#
	# Provider-selection design (locked 2026-05-28):
	# - Region: eu-central-1 (hardcoded; matches existing Jenkins footprint,
	# low latency to EU contributors, no cross-region cache traffic).
	# - Instance type: c7g.4xlarge (16 vCPU / 32 GB Graviton3 == cax41 parity).
	# - Spot first across eu-central-1a/1b/1c; on InsufficientInstanceCapacity
	# in all 3 AZs, retry on-demand across the same 3 AZs.
	# - AMI: Canonical Ubuntu 26.04 arm64 resolved via SSM Parameter Store
	# at runtime (no hardcoded AMI ID; auto-refreshes weekly).
	# - Self-termination: --instance-initiated-shutdown-behavior terminate
	# combined with userData `shutdown -h now` after runner exits;
	# delete-runner-aws is the always-runs safety net for forced cancels.
	# - Mandatory cluster tags (enforced by IAM tag-on-create condition and
	# by the LambdaEC2Cleanup sweeper): iit-billing-tag + PerconaKeep.
	#
	# Trust split (Codex review fix 2026-05-28, P0-1 + P0-2):
	# - NO `actions/checkout` here. PR code must not enter this trusted job,
	# because the workflow holds AWS_ROLE_ARN + GHA_RUNNER_PAT.
	# userData content is INLINED via heredoc below; this workflow file
	# is the single source of truth for the runner bootstrap. Inlining
	# avoids the "PR-controlled checkout poisons trusted bootstrap"
	# attack class (Codex review 2026-05-28 P0-1).
	# - NO instance profile attached. The ephemeral VM holds no AWS creds.
	# PR code on the runner cannot reach the AWS API. The only credential
	# on the instance is the one-shot ~1h-TTL GitHub registration token,
	# embedded in userData for `./config.sh --token`.
	create-runner-aws:
	needs: [dispatch, pick-target]
	if: needs.pick-target.outputs.provider == 'aws'
	runs-on: ubuntu-latest
	permissions:
	# id-token: write for OIDC -> STS exchange in
	# aws-actions/configure-aws-credentials.
	# contents: read is the minimum for the runner to bootstrap; we do
	# not checkout the repo here (see trust-split comment above).
	contents: read
	id-token: write
	outputs:
	runner_label: ${{ env.EPHEMERAL_RUNNER_NAME }}
	instance_id: ${{ steps.run.outputs.instance_id }}
	az: ${{ steps.run.outputs.az }}
	market: ${{ steps.run.outputs.market }}
	steps:
	# OIDC -> STS. Role created in Percona/percona-cd-platform PR 1
	# (terraform/iam/gha-percona-server-ec2-fallback.tf). Trust policy
	# constrains audience to sts.amazonaws.com and subject to this repo +
	# workflow ref so other repos / branches cannot assume the role.
	# Pinned to v4.3.1 (current stable v4) by commit SHA; bumping requires
	# re-verifying the action's source and updating this comment.
	- name: Configure AWS credentials via OIDC
	uses: aws-actions/configure-aws-credentials@7474bc4690e29a8392af63c5b98e7449536d5c3a # v4.3.1
	with:
	role-to-assume: ${{ secrets.AWS_ROLE_ARN }}
	role-session-name: gha-${{ github.run_id }}-${{ github.run_attempt }}
	aws-region: ${{ env.AWS_REGION }}

	# GitHub Actions runner registration token. One-shot, 1h TTL. Lives in
	# the userData script so the EC2 instance can register itself with
	# `./config.sh --token`. Generated here (not on the instance) because
	# the EC2 instance does not hold GHA_RUNNER_PAT.
	- name: Mint GitHub runner registration token
	id: regtoken
	env:
	GH_TOKEN: ${{ secrets.GHA_RUNNER_PAT }}
	run: \|
	set -euo pipefail
	TOKEN=$(gh api -X POST /repos/${{ github.repository }}/actions/runners/registration-token --jq .token)
	if [ -z "$TOKEN" ] \|\| [ "$TOKEN" = "null" ]; then
	echo "::error::Failed to mint runner registration token"
	exit 1
	fi
	# Mark as a workflow secret so accidental log echoes are scrubbed.
	echo "::add-mask::$TOKEN"
	echo "token=$TOKEN" >> "$GITHUB_OUTPUT"

	# Resolve the current Canonical Ubuntu 26.04 arm64 AMI from SSM at
	# runtime. Canonical refreshes this parameter weekly with security
	# patches; never hardcode the AMI ID in this workflow.
	- name: Resolve Ubuntu 26.04 arm64 AMI
	id: ami
	run: \|
	set -euo pipefail
	AMI=$(aws ssm get-parameter \
	--name /aws/service/canonical/ubuntu/server/26.04/stable/current/arm64/hvm/ebs-gp3/ami-id \
	--region "$AWS_REGION" \
	--query Parameter.Value --output text)
	if [ -z "$AMI" ] \|\| [ "$AMI" = "None" ]; then
	echo "::error::Failed to resolve Ubuntu 26.04 arm64 AMI from SSM"
	exit 1
	fi
	echo "Resolved AMI: $AMI"
	echo "ami=$AMI" >> "$GITHUB_OUTPUT"

	# Build the userData payload inline (P0-1 fix). The heredoc body uses
	# only literal shell `${VAR}` references that are expanded by the
	# workflow runner's shell at write time, NOT by envsubst on a file
	# that PR code could mutate. The resulting plain-bash script is what
	# cloud-init runs on the EC2 instance.
	#
	# Variables exported into this step:
	# RUNNER_TOKEN one-shot ~1h-TTL GitHub registration token
	# EPHEMERAL_RUNNER_NAME unique runner name (=== RUNNER_LABEL)
	# RUNNER_URL https://github.com/<owner>/<repo>
	# RUNNER_VERSION pinned actions/runner release (without leading v)
	# RUNNER_SHA256 SHA256 of actions-runner-linux-arm64-<ver>.tar.gz
	- name: Render userData (inline; no checkout)
	env:
	RUNNER_TOKEN: ${{ steps.regtoken.outputs.token }}
	RUNNER_URL: https://github.com/${{ github.repository }}
	# Pinned actions/runner release. Bump together with RUNNER_SHA256.
	# GitHub deprecates runner versions (typically 4-6 months after
	# release); a deprecated runner registers fine but is immediately
	# rejected with "cannot receive messages" and exits. Verify the pin
	# against https://github.com/actions/runner/releases periodically.
	# Last bump 2026-05-28 (v2.328.0 -> v2.334.0; 2.328.0 was deprecated).
	RUNNER_VERSION: '2.334.0'
	# SHA256 of actions-runner-linux-arm64-2.334.0.tar.gz from the
	# actions/runner GitHub release page (BEGIN/END SHA linux-arm64 markers).
	RUNNER_SHA256: 'f44255bd3e80160eb25f71bc83d06ea025f6908748807a584687b3184759f7e4'
	run: \|
	set -euo pipefail
	mkdir -p /tmp/ec2
	# Fail fast if any required variable is empty; we'd rather not
	# ship a half-rendered userData to AWS.
	: "${RUNNER_TOKEN:?registration token missing}"
	: "${EPHEMERAL_RUNNER_NAME:?runner name missing}"
	: "${RUNNER_URL:?runner url missing}"
	: "${RUNNER_VERSION:?runner version pin missing}"
	: "${RUNNER_SHA256:?runner sha256 pin missing}"

	# Heredoc WITHOUT a quoted delimiter -> the workflow shell expands
	# ${VAR} at write time. PR code never touches this content.
	# YAML forces a multi-line block to share an indentation prefix;
	# we strip exactly 10 leading spaces on every heredoc body line
	# via sed before writing so cloud-init sees a script starting at
	# column 1 (the `#!` shebang must be column 1 or cloud-init
	# refuses to exec it).
	sed -E 's/^ //' <<EOF > /tmp/ec2/userdata.sh
	#!/bin/bash
	# Inlined from .github/workflows/builds.yml (create-runner-aws).
	# This heredoc is the single source of truth for the runner
	# bootstrap script. Do not duplicate it to a separate file
	# (would be a PR-poisonable trusted-bootstrap path; PS-11219).
	set -euxo pipefail
	exec > >(tee -a /var/log/gha-runner.log) 2>&1

	# Self-shutdown on any exit path. RunInstances was called with
	# --instance-initiated-shutdown-behavior terminate, so this
	# reaps the instance rather than just powering it off.
	trap '/sbin/shutdown -h now' EXIT

	echo "Starting userData at \$(date -u +%FT%TZ)"
	echo "Resolved RUNNER_VERSION=${RUNNER_VERSION}"
	echo "Resolved EPHEMERAL_RUNNER_NAME=${EPHEMERAL_RUNNER_NAME}"

	export DEBIAN_FRONTEND=noninteractive

	# Install runtime deps with retry-on-flake.
	ok=0
	for i in 1 2 3; do
	if apt-get update -y \\
	&& apt-get install -y --no-install-recommends \\
	curl ca-certificates jq tar libicu78 git sudo; then
	ok=1
	break
	fi
	sleep \$((i * 15))
	done
	[ "\$ok" = 1 ] \|\| { echo "apt install failed after 3 attempts"; exit 1; }

	# Unprivileged runner user; /home/runner matches the Hetzner
	# action's convention and the CCACHE_DIR baked into builds.yml.
	if ! id -u runner >/dev/null 2>&1; then
	useradd --create-home --shell /bin/bash --home-dir /home/runner runner
	fi

	# Passwordless sudo for the runner. percona-server build steps
	# invoke \`sudo apt-get\` extensively (Install Build Dependencies);
	# without NOPASSWD the runner cannot install packages and the build
	# fails immediately. The instance has no inbound network (no SSH);
	# the runner only runs one ephemeral job; expanding sudo to NOPASSWD
	# is bounded by the ephemeral-VM blast radius.
	install -m 0440 -o root -g root /dev/stdin /etc/sudoers.d/90-runner <<'SUDOERS'
	runner ALL=(ALL) NOPASSWD:ALL
	SUDOERS

	RUNNER_DIR=/home/runner/actions-runner
	mkdir -p "\${RUNNER_DIR}"
	chown -R runner:runner /home/runner

	# Download the pinned actions/runner ARM64 tarball.
	TARBALL="actions-runner-linux-arm64-${RUNNER_VERSION}.tar.gz"
	TARBALL_URL="https://github.com/actions/runner/releases/download/v${RUNNER_VERSION}/\${TARBALL}"
	cd "\${RUNNER_DIR}"
	curl --fail --silent --show-error --location --retry 5 --retry-delay 5 \\
	--output "\${TARBALL}" "\${TARBALL_URL}"

	# FAIL HARD on checksum mismatch.
	echo "${RUNNER_SHA256} \${TARBALL}" \| sha256sum --check --status \\
	\|\| { echo "SHA256 mismatch for \${TARBALL}; refusing to continue"; exit 1; }

	tar xzf "\${TARBALL}"
	rm -f "\${TARBALL}"
	chown -R runner:runner "\${RUNNER_DIR}"

	# Configure + run as the unprivileged user.
	# --ephemeral : deregister after one job
	# --disableupdate : never self-update mid-job (we pin the version)
	# --unattended : non-interactive
	sudo -u runner -H bash -lc "
	set -euxo pipefail
	cd '\${RUNNER_DIR}'
	./config.sh \\
	--url '${RUNNER_URL}' \\
	--token '${RUNNER_TOKEN}' \\
	--name '${EPHEMERAL_RUNNER_NAME}' \\
	--labels '${EPHEMERAL_RUNNER_NAME}' \\
	--runnergroup default \\
	--work _work \\
	--unattended \\
	--ephemeral \\
	--disableupdate
	"
	echo "Token registered, runner: ${EPHEMERAL_RUNNER_NAME}"

	runner_status=0
	sudo -u runner -H bash -lc "cd '\${RUNNER_DIR}' && ./run.sh" \|\| runner_status=\$?
	echo "Runner exited with status \${runner_status}"

	echo "Shutting down at \$(date -u +%FT%TZ)"
	exit 0
	EOF
	chmod 0644 /tmp/ec2/userdata.sh
	# Sanity checks:
	# (a) shebang at column 1 (cloud-init refuses otherwise),
	# (b) all required values made it into the rendered script.
	if [ "$(head -1 /tmp/ec2/userdata.sh)" != "#!/bin/bash" ]; then
	echo "::error::Rendered userData does not start with #!/bin/bash at column 1"
	head -3 /tmp/ec2/userdata.sh
	exit 1
	fi
	for needle in "${EPHEMERAL_RUNNER_NAME}" "${RUNNER_URL}" "${RUNNER_VERSION}" "${RUNNER_SHA256}"; do
	if ! grep -qF "$needle" /tmp/ec2/userdata.sh; then
	echo "::error::Rendered userData missing expected value (sanity check failed)"
	exit 1
	fi
	done

	# Spot-first across 3 AZs, then on-demand across the same 3 AZs.
	# Outputs instance_id, az, market (=spot\|on-demand) so delete-runner-aws
	# and the GHA summary can report what was launched.
	#
	# Tags applied on the RunInstances call (not as a follow-up
	# CreateTags) because the cluster IAM policy attaches a
	# condition that requires iit-billing-tag + PerconaKeep to be
	# present in the RunInstances request itself.
	#
	# --client-token (P1-7): provides launch idempotency keyed on
	# run_id + run_attempt + AZ + market, so a retried step does not
	# double-launch the same instance.
	#
	# --iam-instance-profile is DELIBERATELY ABSENT (P0-2 fix). The
	# ephemeral VM intentionally holds no AWS credentials; PR code
	# cannot reach the AWS API from the runner.
	- id: run
	name: RunInstances (spot eu-central-1a/1b/1c, then on-demand)
	env:
	AMI_ID: ${{ steps.ami.outputs.ami }}
	run: \|
	set -euo pipefail

	TAG_SPEC="ResourceType=instance,Tags=[\
	{Key=Name,Value=ps-arm64-${{ github.run_id }}-${{ github.run_attempt }}},\
	{Key=iit-billing-tag,Value=percona-server-gha-fallback},\
	{Key=PerconaKeep,Value=True},\
	{Key=github_run_id,Value=${{ github.run_id }}},\
	{Key=github_run_attempt,Value=${{ github.run_attempt }}},\
	{Key=github_workflow,Value=builds},\
	{Key=github_repository,Value=${{ github.repository }}}]"

	AZS=(eu-central-1a eu-central-1b eu-central-1c)
	INSTANCE_ID=""
	CHOSEN_AZ=""
	CHOSEN_MARKET=""

	# Helper: try to launch in $1=az with market $2=spot\|on-demand.
	# Echoes the instance id on success, empty on InsufficientCapacity.
	# Any other AWS error exits the job non-zero (fail fast).
	try_launch() {
	local az="$1" market="$2"
	local market_opts=()
	if [ "$market" = "spot" ]; then
	market_opts=(--instance-market-options 'MarketType=spot')
	fi
	# Client-token: stable per (run_id, run_attempt, az, market) so a
	# retried RunInstances call returns the same instance instead of
	# launching a duplicate. AWS requires <= 64 chars; the run-id +
	# attempt + az + market fits comfortably.
	local client_token="ps-${{ github.run_id }}-${{ github.run_attempt }}-${az}-${market}"
	set +e
	# Canonical's Ubuntu 24.04 ARM64 AMI defaults the root volume to
	# 8 GB which fills up partway through the percona-server Debug
	# build (boost + ccache + intermediate objects). Override to
	# 80 GB gp3, delete-on-termination so the volume dies with the
	# ephemeral instance and the cleanup Lambdas have nothing to do.
	OUT=$(aws ec2 run-instances \
	--region "$AWS_REGION" \
	--image-id "$AMI_ID" \
	--instance-type "$AWS_INSTANCE_TYPE" \
	--placement "AvailabilityZone=$az" \
	--instance-initiated-shutdown-behavior terminate \
	--user-data file:///tmp/ec2/userdata.sh \
	--tag-specifications "$TAG_SPEC" \
	--block-device-mappings '[{"DeviceName":"/dev/sda1","Ebs":{"VolumeSize":80,"VolumeType":"gp3","DeleteOnTermination":true}}]' \
	--client-token "$client_token" \
	--metadata-options 'HttpTokens=required,HttpPutResponseHopLimit=2,HttpEndpoint=enabled' \
	"${market_opts[@]}" \
	--query 'Instances[0].InstanceId' --output text 2>/tmp/ec2/run.err)
	rc=$?
	set -e
	if [ $rc -eq 0 ] && [ -n "$OUT" ] && [ "$OUT" != "None" ]; then
	echo "$OUT"
	return 0
	fi
	ERR=$(cat /tmp/ec2/run.err)
	# Match the two capacity-shaped errors AWS returns; everything
	# else (auth, quota, malformed request) is fatal because retrying
	# will not help.
	# IMPORTANT: warnings/errors must go to STDERR (>&2), otherwise the
	# surrounding `$(try_launch ...)` capture swallows them silently.
	if echo "$ERR" \| grep -qE 'InsufficientInstanceCapacity\|SpotMaxPriceTooLow\|MaxSpotInstanceCountExceeded'; then
	echo "::warning::$market launch failed in $az: $(echo "$ERR" \| head -1)" >&2
	return 1
	fi
	echo "::error::Fatal RunInstances error in $az ($market): $ERR" >&2
	return 2
	}

	# Pass 1: spot across 3 AZs.
	for az in "${AZS[@]}"; do
	if ID=$(try_launch "$az" spot); then
	INSTANCE_ID="$ID"
	CHOSEN_AZ="$az"
	CHOSEN_MARKET="spot"
	break
	fi
	rc=$?
	[ $rc -eq 2 ] && exit 1
	done

	# Pass 2: on-demand across the same 3 AZs if spot is fully exhausted.
	if [ -z "$INSTANCE_ID" ]; then
	echo "::notice::All 3 AZs returned no spot capacity for $AWS_INSTANCE_TYPE; retrying on-demand"
	for az in "${AZS[@]}"; do
	if ID=$(try_launch "$az" on-demand); then
	INSTANCE_ID="$ID"
	CHOSEN_AZ="$az"
	CHOSEN_MARKET="on-demand"
	break
	fi
	rc=$?
	[ $rc -eq 2 ] && exit 1
	done
	fi

	if [ -z "$INSTANCE_ID" ]; then
	echo "::error::No c7g.4xlarge capacity in eu-central-1a/1b/1c for either spot or on-demand. Giving up."
	exit 1
	fi

	echo "Launched $INSTANCE_ID ($CHOSEN_MARKET) in $CHOSEN_AZ"
	{
	echo "### EC2 fallback runner launched"
	echo ""
	echo "- Instance: \`$INSTANCE_ID\`"
	echo "- Type: \`$AWS_INSTANCE_TYPE\`"
	echo "- AZ: \`$CHOSEN_AZ\`"
	echo "- Market: \`$CHOSEN_MARKET\`"
	echo "- AMI: \`$AMI_ID\`"
	} >> "$GITHUB_STEP_SUMMARY"
	{
	echo "instance_id=$INSTANCE_ID"
	echo "az=$CHOSEN_AZ"
	echo "market=$CHOSEN_MARKET"
	} >> "$GITHUB_OUTPUT"

	# Wait for the runner to register itself with GitHub. Poll the
	# repository-scoped runners list every 10s for up to 5 minutes
	# (30 polls). cloud-init typically completes in 60-120s on c7g.4xlarge;
	# the 5-minute budget absorbs the worst-case GitHub release CDN delay
	# observed on Hetzner (Codex 2026-05-22).
	- name: Wait for runner to come online
	env:
	GH_TOKEN: ${{ secrets.GHA_RUNNER_PAT }}
	INSTANCE_ID: ${{ steps.run.outputs.instance_id }}
	run: \|
	set -euo pipefail
	# 10 min budget. Cloud-init on a fresh c7g.4xlarge spot needs
	# apt-update + runner download + extract + configure + register;
	# 5 min was too tight (PS-11219 PoC iteration 3 timed out at 5m15s).
	# First-boot worst case is ~6-7 min on cold AMI/runner-release cache.
	deadline=$(( $(date +%s) + 600 ))
	attempt=0
	while [ "$(date +%s)" -lt "$deadline" ]; do
	attempt=$((attempt + 1))
	STATUS=$(gh api -X GET /repos/${{ github.repository }}/actions/runners --paginate \
	--jq ".runners[] \| select(.name == \"$EPHEMERAL_RUNNER_NAME\") \| .status" \|\| true)
	if [ "$STATUS" = "online" ]; then
	echo "Runner $EPHEMERAL_RUNNER_NAME online after ${attempt} polls"
	exit 0
	fi
	echo "Attempt $attempt: runner status='${STATUS:-not-registered}' (waiting 10s)"
	sleep 10
	done
	# On timeout, capture EC2 console output BEFORE terminating so we
	# have a post-mortem (no SSM available; the no-IAM-on-VM design
	# means we can't shell in either).
	echo "::error::Runner $EPHEMERAL_RUNNER_NAME did not come online within 10m; capturing console output and terminating $INSTANCE_ID"
	aws ec2 get-console-output --region "$AWS_REGION" --instance-id "$INSTANCE_ID" --output text --query Output 2>&1 \| tail -200 \|\| true
	aws ec2 terminate-instances --region "$AWS_REGION" --instance-ids "$INSTANCE_ID" >/dev/null \|\| true
	exit 1

	# UNTRUSTED. PR code (Debug) or 8.4 HEAD (RelWithDebInfo nightly) runs here.
	# Build shape ported from azure-pipelines.yml on 8.4 (per Przemek 2026-05-18:
	# ".cirrus.yml is just a simplified port from Azure"). arm64-specific
	# deviations (system-gcc selection, MTR libeatmydata, -j cap at 16) are
	# annotated inline.
	#
	# PS-11179: needs lists BOTH create-runner-hetzner + create-runner-aws so
	# the dependency wiring works regardless of which provider ran. The
	# `runs-on` expression coalesces the two outputs with `\|\|`; exactly one of
	# them is populated (the other job was skipped via `if:` and has empty
	# outputs), so the coalescing resolves to the active runner label.
	build-arm64:
	needs: [dispatch, pick-target, create-runner-hetzner, create-runner-aws]
	# GHA defaults to skipping a job when ANY needed job is skipped. Since
	# exactly ONE of create-runner-hetzner / create-runner-aws is skipped
	# (the other ran), we explicitly require: dispatch + pick-target green,
	# AND at least one of the two create-runner jobs succeeded.
	if: \|
	always()
	&& needs.dispatch.result == 'success'
	&& needs.pick-target.result == 'success'
	&& (needs.create-runner-hetzner.result == 'success' \|\| needs.create-runner-aws.result == 'success')
	runs-on: ${{ needs.create-runner-hetzner.outputs.runner_label \|\| needs.create-runner-aws.outputs.runner_label }}
	permissions:
	contents: read
	timeout-minutes: 240
	env:
	BUILD_TYPE: ${{ needs.dispatch.outputs.build_type }}
	MTR_SUITE: ${{ needs.dispatch.outputs.mtr_suite }}
	CCACHE_MAXSIZE: ${{ needs.dispatch.outputs.ccache_maxsize }}
	CCACHE_DIR: /home/runner/ccache
	BOOST_DIR: /tmp/boost
	DEBIAN_FRONTEND: noninteractive
	steps:
	- name: System info
	run: \|
	set -eux
	# PS-11179: report whichever provider actually fired.
	echo "Provider: ${{ needs.pick-target.outputs.provider }}"
	if [ "${{ needs.pick-target.outputs.provider }}" = "hetzner" ]; then
	echo "Server type: ${{ needs.create-runner-hetzner.outputs.server_type }}"
	else
	echo "Instance: ${{ needs.create-runner-aws.outputs.instance_id }} (${{ needs.create-runner-aws.outputs.market }} in ${{ needs.create-runner-aws.outputs.az }})"
	fi
	echo "Build type: $BUILD_TYPE"
	echo "MTR suite: $MTR_SUITE"
	uname -a
	nproc
	free -h
	df -h /

	- name: Conditional swap (only when RAM < 16 GB)
	run: \|
	set -eux
	MEM_GB=$(awk '/MemTotal/ {print int($2/1024/1024)}' /proc/meminfo)
	if [ "$MEM_GB" -lt 16 ]; then
	sudo fallocate -l 16G /swapfile
	sudo chmod 600 /swapfile
	sudo mkswap /swapfile
	sudo swapon /swapfile
	fi
	free -h

	# Azure: `*** Install Build Dependencies`. arm64 picks system gcc (no
	# version selector + LLVM repo plumbing needed).
	- name: Install Build Dependencies
	run: \|
	set -eux
	SELECTED_CC="${COMPILER}${COMPILER_VER:+-${COMPILER_VER}}"
	SELECTED_CXX="${COMPILER}++${COMPILER_VER:+-${COMPILER_VER}}"
	[ "$COMPILER" = "gcc" ] && SELECTED_CXX="g++${COMPILER_VER:+-${COMPILER_VER}}"
	echo "SELECTED_CC=$SELECTED_CC" >> "$GITHUB_ENV"
	echo "SELECTED_CXX=$SELECTED_CXX" >> "$GITHUB_ENV"
	PACKAGES="$SELECTED_CC"
	[ "$COMPILER" = "gcc" ] && PACKAGES="$SELECTED_CXX"
	sudo apt-get -yq update
	sudo apt-get -yq --no-install-suggests --no-install-recommends install \
	$PACKAGES make pkg-config dpkg-dev unzip lz4 git cmake cmake-curses-gui ccache bison \
	libtirpc-dev libudev-dev libaio-dev libmecab-dev libnuma-dev \
	libssl-dev libreadline-dev libedit-dev libpam-dev \
	libcurl4-openssl-dev libldap2-dev libkrb5-dev libsasl2-dev \
	libsasl2-modules-gssapi-mit \
	libxml-simple-perl
	# Azure: SYSTEM_LIBRARIES path (BUILD_PARAMS_TYPE != inverted).
	sudo apt-get -yq --no-install-suggests --no-install-recommends install \
	libicu-dev libevent-dev liblz4-dev zlib1g-dev \
	protobuf-compiler libprotobuf-dev libprotoc-dev \
	libzstd-dev libfido2-dev
	# arm64-only addition: libeatmydata1 needed for MTR LD_PRELOAD
	# (Cirrus arm64 task uses it; Azure x86 jobs do not run MTR).
	sudo apt-get -yq --no-install-suggests --no-install-recommends install libeatmydata1
	REAL_COMPILER_VER=$($SELECTED_CC --version \| head -1 \| awk '{print $4}')
	echo "REAL_COMPILER_VER=$REAL_COMPILER_VER" >> "$GITHUB_ENV"

	# Azure ccache key shape: "ccache \| PARENT_BRANCH \| imageName-Compiler-VER-BuildType \| BUILD_PARAMS_TYPE \| <run id>"
	# run_id keeps nightly + dispatch + PR runs each save their own slot;
	# restore-keys falls back to the most-recent matching prefix.
	- name: ccache cache (Azure key shape; build_type-scoped)
	uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.2.0
	with:
	path: /home/runner/ccache
	key: ccache-${{ env.PARENT_BRANCH }}-${{ env.IMAGE_NAME }}-${{ env.COMPILER }}-${{ env.BUILD_TYPE }}-${{ env.BUILD_PARAMS_TYPE }}-${{ github.run_id }}
	restore-keys: \|
	ccache-${{ env.PARENT_BRANCH }}-${{ env.IMAGE_NAME }}-${{ env.COMPILER }}-${{ env.BUILD_TYPE }}-${{ env.BUILD_PARAMS_TYPE }}-

	- name: boost cache (Azure key shape)
	uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.2.0
	with:
	path: /tmp/boost
	key: ${{ env.BOOST_VERSION }}

	- name: Checkout (fetchDepth 32 mirrors Azure)
	uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.2.2
	with:
	fetch-depth: 32
	# PS-11254: on pull_request_target the default checkout ref is the
	# base branch, so explicitly check out the fork PR head. Safe here:
	# build-arm64 holds no secrets (see header trust-split note).
	ref: ${{ github.event_name == 'pull_request_target' && github.event.pull_request.head.sha \|\| '' }}

	- name: Update git submodules
	run: \|
	set -eux
	git submodule sync
	git submodule update --init --force --depth=256
	git submodule

	- name: Compiler and cmake info
	run: \|
	set -eux
	$SELECTED_CC -v
	$SELECTED_CXX -v
	ccache --version
	mkdir -p "$CCACHE_DIR" "$BOOST_DIR"
	ccache -p \| grep -E "max_size\|cache_dir"
	ccache --zero-stats

	# Azure `*** cmake ...` step, 8.4 Linux non-inverted branch.
	- name: cmake (Azure parity, 8.4 Linux non-inverted)
	run: \|
	set -eux
	mkdir bin && cd bin
	COMPILE_OPT=(
	-DCMAKE_C_FLAGS_DEBUG=-g1
	-DCMAKE_CXX_FLAGS_DEBUG=-g1
	)
	CMAKE_OPT="
	-DCMAKE_BUILD_TYPE=$BUILD_TYPE
	-DBUILD_CONFIG=mysql_release
	-DWITH_PACKAGE_FLAGS=OFF
	-DDOWNLOAD_BOOST=1
	-DWITH_BOOST=$BOOST_DIR
	-DCMAKE_C_COMPILER=$SELECTED_CC
	-DCMAKE_CXX_COMPILER=$SELECTED_CXX
	-DCMAKE_C_COMPILER_LAUNCHER=ccache
	-DCMAKE_CXX_COMPILER_LAUNCHER=ccache
	-DWITH_ROCKSDB=ON
	-DWITH_COREDUMPER=ON
	-DWITH_COMPONENT_KEYRING_VAULT=ON
	-DWITH_PAM=ON
	-DMYSQL_MAINTAINER_MODE=ON
	-DWITH_MECAB=system
	-DWITH_NUMA=ON
	-DWITH_EDITLINE=system
	-DWITH_SYSTEM_LIBS=ON
	"
	cmake .. $CMAKE_OPT "${COMPILE_OPT[@]}"
	rm -f "$BOOST_DIR/$BOOST_VERSION.tar.gz"
	cmake -L .

	# Azure: `*** Compile` uses `make -j2` (MS-hosted has 2 cores). arm64
	# deviation: scale to cax* cores, capped at 16 (Cirrus pattern). Literal
	# -j2 would waste cax41's 16 cores; arm64 builds benefit linearly from
	# parallelism (THE migration win).
	- name: Compile (make -j, capped at 16)
	run: \|
	set -eux
	cd bin
	NPROC=$(nproc --all)
	NTHREADS=$(( NPROC > 16 ? 16 : NPROC ))
	echo "Using $NTHREADS/$NPROC threads"
	make -j${NTHREADS}
	ccache --show-stats
	df -h /

	# arm64-only step (Azure x86 does not run MTR; Cirrus arm64 does).
	# Suite picked by dispatch:
	# - main.1st (Debug, per-PR; Cirrus arm64 PR task parity)
	# - binlog_nogtid (RelWithDebInfo, nightly; Cirrus RelWithDebInfo parity, Przemek 2026-05-18)
	- name: MTR (suite per build_type)
	run: \|
	set -eux
	cd bin
	NPROC=$(nproc --all)
	NTHREADS=$(( NPROC > 16 ? 16 : NPROC ))
	LIBEATMYDATA=$(whereis libeatmydata.so \| awk '{print $2}')
	if [ "$MTR_SUITE" = "main.1st" ]; then
	mysql-test/mysql-test-run.pl main.1st \
	--parallel=$NTHREADS \
	--junit-output=/tmp/MTR_results.xml \
	--mysqld-env=LD_PRELOAD=${LIBEATMYDATA} \
	--force --max-test-fail=0 --retry-failure=0 \
	--debug-server
	else
	mysql-test/mysql-test-run.pl \
	--suite=$MTR_SUITE \
	--parallel=$NTHREADS \
	--junit-output=/tmp/MTR_results.xml \
	--mysqld-env=LD_PRELOAD=${LIBEATMYDATA} \
	--force --max-test-fail=0 --retry-failure=0
	fi

	- name: Upload MTR results
	if: always()
	uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.0
	with:
	name: mtr-${{ env.BUILD_TYPE }}-${{ env.MTR_SUITE }}
	path: /tmp/MTR_results.xml
	if-no-files-found: ignore

	# Renamed from `delete-runner` to `delete-runner-hetzner` in PS-11179.
	# Body otherwise unchanged. Only fires when the Hetzner provisioning path
	# actually created a VM.
	delete-runner-hetzner:
	needs: [dispatch, pick-target, create-runner-hetzner, build-arm64]
	# Skip delete when debug_keep_vm is set AND create-runner-hetzner failed,
	# so the broken VM stays alive for manual SSH diagnosis. orphan-sweep
	# reaps it after 6h regardless. Normal happy path is unaffected.
	# Also gated on provider==hetzner so this is a no-op on EC2 fallback runs.
	if: \|
	always()
	&& needs.pick-target.outputs.provider == 'hetzner'
	&& needs.create-runner-hetzner.outputs.server_id != ''
	&& !(inputs.debug_keep_vm == true && needs.create-runner-hetzner.result == 'failure')
	runs-on: ubuntu-latest
	permissions: {}
	steps:
	- uses: olexandr-havryliak/hcloud-github-runner@bb1089d8b718a06493cb37c51dfe596e44baefc2
	with:
	mode: delete
	name: ${{ env.EPHEMERAL_RUNNER_NAME }}
	server_id: ${{ needs.create-runner-hetzner.outputs.server_id }}
	hcloud_token: ${{ secrets.GHA_RUNNER_HCLOUD_TOKEN }}
	github_token: ${{ secrets.GHA_RUNNER_PAT }}

	# PS-11179: Always-runs safety net for the EC2 fallback path.
	#
	# The instance self-terminates after the runner exits (userData does
	# `shutdown -h now` and we pass --instance-initiated-shutdown-behavior
	# terminate), so on the happy path TerminateInstances is idempotent /
	# no-op. This job exists for the failure cases:
	# - Workflow cancelled mid-build
	# - build-arm64 timed out
	# - userData crashed before reaching the shutdown line
	# - registration polling failed and bailed out of create-runner-aws
	#
	# Also de-registers the runner from GitHub so the next run does not
	# collide on the same EPHEMERAL_RUNNER_NAME. The runner usually self-removes
	# via `./run.sh --ephemeral`, but if it died before --ephemeral kicked in,
	# the orphan entry would block re-registration.
	#
	# Drops the create-runner-aws.outputs.instance_id != '' gate (P1-7 fix):
	# if the job was cancelled between RunInstances and `>> $GITHUB_OUTPUT`,
	# the output is empty but a live instance still exists. We discover by
	# tag (github_run_id == ${{ github.run_id }}) instead, then union with
	# the published output as a belt-and-braces measure.
	delete-runner-aws:
	needs: [dispatch, pick-target, create-runner-aws, build-arm64]
	if: \|
	always()
	&& needs.pick-target.outputs.provider == 'aws'
	runs-on: ubuntu-latest
	permissions:
	contents: read
	id-token: write
	steps:
	- name: Configure AWS credentials via OIDC
	uses: aws-actions/configure-aws-credentials@7474bc4690e29a8392af63c5b98e7449536d5c3a # v4.3.1
	with:
	role-to-assume: ${{ secrets.AWS_ROLE_ARN }}
	role-session-name: gha-${{ github.run_id }}-${{ github.run_attempt }}-cleanup
	aws-region: ${{ env.AWS_REGION }}

	# Tag-based discovery first, then union with the published output.
	# Covers: (a) happy path (output populated; tag query agrees),
	# (b) cancelled mid-launch (output empty; tag query finds it),
	# (c) double-launch from a retry that escaped client-token (both
	# share the tag and both get terminated).
	- name: Terminate EC2 instance (safety net)
	env:
	PUBLISHED_INSTANCE_ID: ${{ needs.create-runner-aws.outputs.instance_id }}
	run: \|
	set -euo pipefail
	IDS=$(aws ec2 describe-instances \
	--region "$AWS_REGION" \
	--filters \
	"Name=tag:github_run_id,Values=${{ github.run_id }}" \
	"Name=tag:github_run_attempt,Values=${{ github.run_attempt }}" \
	"Name=tag:github_repository,Values=${{ github.repository }}" \
	"Name=tag:iit-billing-tag,Values=percona-server-gha-fallback" \
	"Name=instance-state-name,Values=pending,running,stopping,stopped" \
	--query 'Reservations[].Instances[].InstanceId' --output text 2>/dev/null \|\| true)
	# Union with whatever the create job published; dedupe via sort -u.
	ALL_IDS=$(printf '%s\n%s\n' "$IDS" "${PUBLISHED_INSTANCE_ID:-}" \
	\| tr '\t' '\n' \| grep -E '^i-' \| sort -u \|\| true)
	if [ -z "$ALL_IDS" ]; then
	echo "No live EC2 instance found for run ${{ github.run_id }} attempt ${{ github.run_attempt }} (already terminated or never launched)"
	exit 0
	fi
	echo "Terminating: $ALL_IDS"
	# \|\| true: instance may race to terminated between describe and
	# terminate; either way we want this job to succeed so the
	# workflow status is not contaminated by cleanup-only errors.
	# shellcheck disable=SC2086
	aws ec2 terminate-instances \
	--region "$AWS_REGION" \
	--instance-ids $ALL_IDS >/dev/null 2>&1 \|\| true

	- name: De-register orphaned runner (if still present)
	env:
	GH_TOKEN: ${{ secrets.GHA_RUNNER_PAT }}
	run: \|
	set -euo pipefail
	ID=$(gh api -X GET /repos/${{ github.repository }}/actions/runners --paginate \
	--jq ".runners[] \| select(.name == \"$EPHEMERAL_RUNNER_NAME\") \| .id" \|\| true)
	if [ -n "$ID" ]; then
	gh api -X DELETE "/repos/${{ github.repository }}/actions/runners/$ID" \|\| true
	echo "Removed orphan runner $EPHEMERAL_RUNNER_NAME (id=$ID)"
	else
	echo "Runner $EPHEMERAL_RUNNER_NAME already de-registered (ephemeral self-removal)"
	fi

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PS-10595 [8.4]: Lazy initialization for buffer pool block latches #152

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PS-10595 [8.4]: Lazy initialization for buffer pool block latches #152

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