.github/workflows/reusable-san.yml

name: Reusable Sanitizer

on:
  workflow_call:
    inputs:
      sanitizer:
        required: true
        type: string
      free-threading:
        description: Whether to use free-threaded mode
        required: false
        type: boolean
        default: false

permissions:
  contents: read

env:
  FORCE_COLOR: 1

jobs:
  build-san-reusable:
    name: >-
      ${{ inputs.sanitizer }}${{
        inputs.free-threading
        && ' (free-threading)'
        || ''
      }}
    runs-on: ubuntu-24.04
    timeout-minutes: 60
    steps:
    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
      with:
        persist-credentials: false
    - name: Runner image version
      run: echo "IMAGE_OS_VERSION=${ImageOS}-${ImageVersion}" >> "$GITHUB_ENV"
    - name: Install dependencies
      run: |
        sudo ./.github/workflows/posix-deps-apt.sh
        # Install clang
        wget https://apt.llvm.org/llvm.sh
        chmod +x llvm.sh
        sudo ./llvm.sh 20
        sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-20 100
        sudo update-alternatives --set clang /usr/bin/clang-20
        sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-20 100
        sudo update-alternatives --set clang++ /usr/bin/clang++-20

        if [ "${SANITIZER}" = "TSan" ]; then
          # Reduce ASLR to avoid TSan crashing
          sudo sysctl -w vm.mmap_rnd_bits=28
        fi

    - name: Sanitizer option setup
      run: |
        if [ "${SANITIZER}" = "TSan" ]; then
          echo "TSAN_OPTIONS=${SAN_LOG_OPTION} suppressions=${GITHUB_WORKSPACE}/Tools/tsan/suppressions${{
              fromJSON(inputs.free-threading)
              && '_free_threading'
              || ''
            }}.txt handle_segv=0" >> "$GITHUB_ENV"
        else
          echo "UBSAN_OPTIONS=${SAN_LOG_OPTION} halt_on_error=1 suppressions=${GITHUB_WORKSPACE}/Tools/ubsan/suppressions.txt" >> "$GITHUB_ENV"
        fi
        echo "CC=clang" >> "$GITHUB_ENV"
        echo "CXX=clang++" >> "$GITHUB_ENV"
      env:
        SANITIZER: ${{ inputs.sanitizer }}
        SAN_LOG_OPTION: log_path=${{ github.workspace }}/san_log
    - name: Configure CPython
      run: >-
        ./configure
        --config-cache
        ${{
          inputs.sanitizer == 'TSan'
          && '--with-thread-sanitizer'
          || '--with-undefined-behavior-sanitizer --with-strict-overflow'
        }}
        --with-pydebug
        ${{ fromJSON(inputs.free-threading) && '--disable-gil' || '' }}
    - name: Build CPython
      run: make -j4
    - name: Display build info
      run: make pythoninfo
    # test_{capi,faulthandler} are skipped under UBSan because
    # they raise signals that UBSan with halt_on_error=1 intercepts.
    - name: Tests
      run: >-
        ./python -m test
        ${{ inputs.sanitizer == 'TSan' && '--tsan' || '' }}
        ${{ inputs.sanitizer == 'UBSan' && '-x test_capi -x test_faulthandler' || '' }}
        -j4 -W
    - name: Parallel tests
      if: >-
        inputs.sanitizer == 'TSan'
        && fromJSON(inputs.free-threading)
      run: ./python -m test --tsan-parallel --parallel-threads=4 -j4 -W
    - name: Display logs
      if: always()
      run: find "${GITHUB_WORKSPACE}" -name 'san_log.*' | xargs head -n 1000
    - name: Archive logs
      if: always()
      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
      with:
        name: >-
          ${{ inputs.sanitizer }}-logs-${{
            fromJSON(inputs.free-threading)
            && 'free-threading'
            || 'default'
          }}
        path: san_log.*
        if-no-files-found: ignore