Update the buildAndTestCMake: save core dumps

.github/workflows/buildAndTestCMake.yml

@@ -65,18 +65,29 @@ jobs:
       uses: ./.github/actions/setup-build
       with:
         llvm-version: ${{ steps.llvm-version.outputs.version }}
-
+    - name: Setup Core Dumps
+      run: |
+          sudo mkdir /cores
+          sudo chmod 777 /cores
+          # Core filenames will be of the form executable.pid.timestamp:
+          sudo bash -c 'echo "/cores/%e.%p.%t" > /proc/sys/kernel/core_pattern'
+    - name: Build and Run X
+      run: |
+        ulimit -c unlimited
+        make x
+        cat /proc/sys/kernel/core_pattern
+        ./x
     - name: Configure and Build LLVM
       shell: bash
       run: |
         ./build_tools/github_actions/ci_build_cmake_llvm.sh "$LLVM_PROJECT_DIR" "$LLVM_BUILD_DIR"
       env:
           CMAKE_BUILD_TYPE: Release
           MLIR_ENABLE_BINDINGS_PYTHON: ON
-
     - name: Build and Test StableHLO (with AddressSanitizer)
       shell: bash
       run: |
+        ulimit -c unlimited         # Enable core dumps to be captured (must be in same run block)
         ./build_tools/github_actions/ci_build_cmake.sh "$LLVM_BUILD_DIR" "$STABLEHLO_BUILD_DIR"
       env:
           CMAKE_BUILD_TYPE: Release
@@ -89,4 +100,12 @@ jobs:
         ./build_tools/github_actions/ci_build_cmake.sh "$LLVM_BUILD_DIR" "$STABLEHLO_BUILD_DIR"
       env:
           CMAKE_BUILD_TYPE: Release
-          STABLEHLO_ENABLE_BINDINGS_PYTHON: ON
+          STABLEHLO_ENABLE_BINDINGS_PYTHON: ON
+
+    - name: Upload Core Dumps
+      if: ${{ failure() }}
+      uses: actions/upload-artifact@v4
+      with:
+        name: crashes
+        path: /cores/*
+        if-no-files-found: ignore

x.c

@@ -0,0 +1,19 @@
+#include <signal.h>
+#include <unistd.h>
+
+int x() {
+    return 1;
+}
+
+int y() {
+    return 1 + x();
+}
+
+int z() {
+    return 2 + y();
+}
+
+int main() {
+    kill(getpid(), SIGABRT);
+    return 3 + z();
+}