fix the layer info test failure and deal with potential segfault

[narendasan]

Description

Cherry pick of the change for main #4042

Fixes # (issue)

Type of change

Please delete options that are not relevant and/or add your own.

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[github-actions]

There are some changes that do not conform to Python style guidelines:

--- /home/runner/work/TensorRT/TensorRT/tests/py/ts/api/test_classes.py	2026-01-26 20:43:20.314235+00:00
+++ /home/runner/work/TensorRT/TensorRT/tests/py/ts/api/test_classes.py	2026-01-26 20:44:02.246054+00:00
@@ -336,11 +336,14 @@
            TestTorchTensorRTModule._get_trt_mod(),
            TestTorchTensorRTModule._get_trt_mod(via_ts=True),
        ):
            layer_info = trt_mod.get_layer_info()
            trt_json = json.loads(layer_info)
-            [self.assertTrue(k in trt_json.keys(), f"Key {k} is missing") for k in ["Layers", "Bindings"]]
+            [
+                self.assertTrue(k in trt_json.keys(), f"Key {k} is missing")
+                for k in ["Layers", "Bindings"]
+            ]
            self.assertTrue(len(trt_json["Layers"]) == 4, "Not enough layers found")
            self.assertTrue(len(trt_json["Bindings"]) == 2, "Not enough bindings found")


if __name__ == "__main__":

[github-actions]

There are some changes that do not conform to Python style guidelines:

--- /home/runner/work/TensorRT/TensorRT/tests/py/ts/api/test_classes.py	2026-01-27 00:14:54.946736+00:00
+++ /home/runner/work/TensorRT/TensorRT/tests/py/ts/api/test_classes.py	2026-01-27 00:15:36.540336+00:00
@@ -369,6 +369,6 @@
            self.assertTrue(len(trt_json["Layers"]) == num_layers)
            self.assertTrue(len(trt_json["Bindings"]) == 2)


if __name__ == "__main__":
-    unittest.main()
\ No newline at end of file
+    unittest.main()