[Mlir-commits] [mlir] [mlir][python] Fix segfault at interpreter shutdown with entered contexts (PR #203826)

llvmlistbot at llvm.org llvmlistbot at llvm.org
Sun Jun 14 22:27:32 PDT 2026


github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- mlir/lib/Bindings/Python/IRCore.cpp --diff_from_common_commit
``````````

:warning:
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
:warning:

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/mlir/lib/Bindings/Python/IRCore.cpp b/mlir/lib/Bindings/Python/IRCore.cpp
index e0a141d09..fc69ef888 100644
--- a/mlir/lib/Bindings/Python/IRCore.cpp
+++ b/mlir/lib/Bindings/Python/IRCore.cpp
@@ -5299,10 +5299,8 @@ void populateIRCore(nb::module_ &m) {
   // the main thread. When the thread_local vector destructs, its nb::object
   // members call Py_DECREF through the dead runtime, causing a segfault.
   // Clearing the stack in atexit releases references while alive.
-  nb::module_::import_("atexit")
-      .attr("register")(nb::cpp_function([]() {
-        PyThreadContextEntry::getStack().clear();
-      }));
+  nb::module_::import_("atexit").attr("register")(
+      nb::cpp_function([]() { PyThreadContextEntry::getStack().clear(); }));
 }
 } // namespace MLIR_BINDINGS_PYTHON_DOMAIN
 } // namespace python

``````````

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https://github.com/llvm/llvm-project/pull/203826


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