Add TSan CI job conditioned to PR label

.github/workflows/tsan.yml

@@ -0,0 +1,93 @@
+# Build the compiler and run the testsuite with ThreadSanitizer, if PR is
+# labelled with run-thread-sanitizer
+name: Run testsuite with ThreadSanitizer
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+
+# Restrict the GITHUB_TOKEN
+permissions: {}
+
+# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#concurrency
+# Concurrent workflows are grouped by the PR or branch that triggered them
+# (github.ref) and the name of the workflow (github.workflow). The
+# 'cancel-in-progress' option then make sure that only one workflow is running
+# at a time. This doesn't prevent new jobs from running, rather it cancels
+# already running jobs before scheduling new jobs.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name == 'pull_request' || github.sha }}
+  cancel-in-progress: true
+
+jobs:
+# This job will do the initial build of the compiler (on linux).
+# We then upload the compiler tree as a build artifact to enable re-use in
+# subsequent jobs.
+  build:
+    if: contains(github.event.pull_request.labels.*.name, 'run-thread-sanitizer')
+    runs-on: 'ubuntu-latest'
+    outputs:
+      manual_changed: ${{ steps.manual.outputs.manual_changed }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          persist-credentials: false
+      - name: Install libunwind
+        run: sudo apt install -y libunwind-dev
+      - name: Configure tree
+        run: |
+          MAKE_ARG=-j CONFIG_ARG='--enable-cmm-invariants --enable-dependency-generation --enable-native-toplevel --enable-tsan --enable-ocamltest CFLAGS=-DTSAN_INSTRUMENT_ALL' OCAMLRUNPARAM=b,v=0 bash -xe tools/ci/actions/runner.sh configure
+      - name: Build
+        run: |
+          MAKE_ARG=-j bash -xe tools/ci/actions/runner.sh build
+      - name: Prepare Artifact
+        run: tar --zstd -cf /tmp/sources.tar.zstd .
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: compiler
+          path: /tmp/sources.tar.zstd
+          retention-days: 1
+
+# Testsuite run jobs:
+# normal: Run the full testsuite
+# debug: Run the full testsuite with the debug runtime and minor heap
+#        verification.
+  normal:
+    if: contains(github.event.pull_request.labels.*.name, 'run-thread-sanitizer')
+    name: ${{ matrix.name }}
+    needs: build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - id: normal
+            name: normal
+            dependencies: libunwind-dev
+          - id: debug
+            name: extra (debug)
+            dependencies: libunwind-dev
+    steps:
+      - name: Download Artifact
+        uses: actions/download-artifact@v3
+        with:
+          name: compiler
+      - name: Unpack Artifact
+        run: |
+          tar --zstd -xf sources.tar.zstd
+          rm -f sources.tar.zstd
+      - name: Packages
+        if: matrix.dependencies != ''
+        run: |
+          sudo apt-get update -y && sudo apt-get install -y ${{ matrix.dependencies }}
+      - name: Run the testsuite
+        if: matrix.id == 'normal'
+        run: |
+          TSAN_OPTIONS=history_size=6 MAKE_ARG=-j OCAMLRUNPARAM=b,v=0 bash -xe tools/ci/actions/runner.sh test_sequential
+      - name: Run the testsuite (debug runtime)
+        if: matrix.id == 'debug'
+        env:
+          OCAMLRUNPARAM: v=0,V=1
+          USE_RUNTIME: d
+        run: |
+          bash -cxe "TSAN_OPTIONS=history_size=6 SHOW_TIMINGS=1 tools/ci/actions/runner.sh test_sequential"

tools/ci/actions/runner.sh

@@ -70,8 +70,13 @@ Build () {
 }
 
 Test () {
-  echo Running the testsuite
-  $MAKE -C testsuite parallel
+  if [ "$1" = "sequential" ]; then
+    echo Running the testsuite sequentially
+    $MAKE -C testsuite all
+  else
+    echo Running the testsuite
+    $MAKE -C testsuite parallel
+  fi
   cd ..
 }
 
@@ -169,6 +174,7 @@ case $1 in
 configure) Configure;;
 build) Build;;
 test) Test;;
+test_sequential) Test sequential;;
 test_prefix) TestPrefix $2;;
 api-docs) API_Docs;;
 install) Install;;