Populate PluginInfo::tritonVersion + CI smoke test

.github/workflows/ci.yml

@@ -112,6 +112,18 @@ jobs:
                TRITON_INSTALL_DIR="${{ steps.build-triton.outputs.triton_install_dir }}"
                EXTRA_CMAKE_ARGS="-DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_COMPILER_LAUNCHER=sccache"
 
+      - name: Smoke test plugin import
+        # `make test` only runs lit/FileCheck tests, which exercise MLIR passes
+        # but never load the plugin into Python. Regressions in the plugin's
+        # static init (e.g. PluginInfo fields read by libtriton's loader) slip
+        # through unless we actually `import triton` with TRITON_PLUGIN_PATHS
+        # pointing at the freshly-built libutlx.so.
+        env:
+          TRITON_PLUGIN_PATHS: ${{ github.workspace }}/build/lib/libutlx.so
+        run: |
+          test -f "$TRITON_PLUGIN_PATHS" || { echo "libutlx.so missing at $TRITON_PLUGIN_PATHS"; exit 1; }
+          python3 -c "import triton; print('triton', triton.__version__, 'loaded with utlx plugin from', '$TRITON_PLUGIN_PATHS')"
+
       - name: Run tests
         run: >
           make test LLVM_INSTALL_DIR="${{ steps.build-llvm.outputs.llvm_install_dir }}"

extensions/utlx/uTLXPlugin.cpp

@@ -13,6 +13,7 @@
 #include "triton/Dialect/TritonGPU/IR/Dialect.h"
 #include "triton/Dialect/TritonNvidiaGPU/IR/Dialect.h"
 #include "triton/Tools/PluginUtils.h"
+#include "triton/Version.h"
 
 // TLX dialect headers
 #include "tlx/dialect/include/IR/Dialect.h"
@@ -803,6 +804,11 @@ TRITON_PLUGIN_API plugin::PluginInfo *tritonGetPluginInfo() {
       1, // numDialects
       ops,
       48, // numOps
+      // Triton commit `8497c845a` (#9937) added `isTritonAndPluginsVersionsMatch`
+      // which dereferences `info->tritonVersion` unconditionally — leaving this
+      // field nullptr crashes libtriton's import with `basic_string::_M_construct
+      // null not valid` before any Python-side workaround can run.
+      TRITON_VERSION,
   };
   return &info;
 }