Skip AOTI tests on macOS CI and bump job timeout to 120 min

Summary:
AOTI tests (llama3_2_vision and select extension/llm tests) hang
indefinitely on macOS CI runners after the PyTorch 2.12 pin update.
The hang is in native C/C++ code (inductor compilation / dlopen),
which prevents faulthandler from producing a traceback. Diagnosis
is ongoing in pytorch#19886.

Skip the affected tests and bump the macOS job timeout from the
default 90 to 120 minutes to add margin (observed completion at
~79 min with skips applied).

Co-Authored-By: Claude <noreply@anthropic.com>

Author: SS-JIA

.ci/scripts/unittest-macos-cmake.sh

@@ -12,8 +12,19 @@ set -eux
 export TORCHINDUCTOR_CACHE_DIR="$(mktemp -d "${RUNNER_TEMP:-/tmp}/torchinductor_cache_XXXXXX")"
 trap 'rm -rf "${TORCHINDUCTOR_CACHE_DIR}"' EXIT
 
-# Run pytest with coverage
-${CONDA_RUN} pytest -n auto --cov=./ --cov-report=xml
+# TODO(SS-JIA): AOTI tests hang on macOS CI runners — the thread blocks in
+# native C/C++ code (dlopen / inductor compilation) so faulthandler cannot
+# even produce a traceback. Diagnosis ongoing in #19886.
+AOTI_SKIPS=(
+  --ignore=examples/models/llama3_2_vision/preprocess/test_preprocess.py
+  --ignore=examples/models/llama3_2_vision/vision_encoder/test/test_vision_encoder.py
+  --ignore=examples/models/llama3_2_vision/text_decoder/test/test_text_decoder.py
+  --deselect=extension/llm/modules/test/test_position_embeddings.py::TilePositionalEmbeddingTest::test_tile_positional_embedding_aoti
+  --deselect=extension/llm/modules/test/test_position_embeddings.py::TiledTokenPositionalEmbeddingTest::test_tiled_token_positional_embedding_aoti
+  --deselect=extension/llm/modules/test/test_attention.py::AttentionTest::test_attention_aoti
+)
+
+${CONDA_RUN} pytest -n auto --cov=./ --cov-report=xml "${AOTI_SKIPS[@]}"
 # Run gtest
 LLVM_PROFDATA="xcrun llvm-profdata" LLVM_COV="xcrun llvm-cov" \
 ${CONDA_RUN} test/run_oss_cpp_tests.sh

.github/workflows/_unittest.yml

@@ -49,6 +49,7 @@ jobs:
       python-version: '3.11'
       submodules: 'recursive'
       ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
+      timeout: 120
       script: |
         set -eux
         # This is needed to get the prebuilt PyTorch wheel from S3