@@ -52,6 +52,8 @@ jobs:
 
     env:
       NUGET_PACKAGES: ${{ github.workspace }}/.nuget/packages
+      # Apply to every Mono host, including pytest and the .NET Python test runner.
+      MONO_THREADS_SUSPEND: preemptive # https://github.com/mono/mono/issues/21466
     steps:
       - name: Checkout code
         uses: actions/checkout@v7
@@ -84,8 +86,6 @@ jobs:
       - name: Embedding tests (Mono/.NET Framework)
         if: always()
         run: dotnet test --runtime any-${{ matrix.os.platform }} --framework net472 --logger "console;verbosity=detailed" src/embed_tests/
-        env:
-          MONO_THREADS_SUSPEND: preemptive # https://github.com/mono/mono/issues/21466
 
       - name: Embedding tests (.NET Core)
         if: always()
@@ -97,7 +97,7 @@ jobs:
 
       - name: Python Tests (Mono)
         if: always()
-        run: pytest --runtime mono
+        run: uv run pytest --runtime mono -v -o faulthandler_timeout=60
 
       - name: Python Tests (.NET Framework)
         if: ${{ matrix.os.category == 'windows' }}
 
@@ -93,6 +93,20 @@ Forgetting this is the most common pythonnet threading bug.  Symptoms range
 from immediate segfaults to subtle refcount corruption that crashes much
 later.
 
+Mono thread suspension
+----------------------
+
+On Linux and macOS, Mono's cooperative/hybrid thread suspension can hang
+when Python and managed threads interact. If affected, set
+``MONO_THREADS_SUSPEND=preemptive`` before starting the process, as described
+in `mono/mono#21466 <https://github.com/mono/mono/issues/21466>`_.
+CI uses this workaround for both embedding and Python-hosted tests.
+
+To run the Mono Python tests with per-test output and a Python thread
+stack dump if a test takes longer than 60 seconds::
+
+    MONO_THREADS_SUSPEND=preemptive uv run pytest --runtime mono -v -o faulthandler_timeout=60
+
 Reference counting and finalizers
 ---------------------------------