[CI][ROCm] Fix test_correctness_sliding_window (#29243)

Signed-off-by: Divakar Verma <divakar.verma@amd.com>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>

tests/v1/e2e/test_correctness_sliding_window.py

@@ -5,6 +5,7 @@ from dataclasses import dataclass
 import pytest
 
 from vllm import LLM, SamplingParams
+from vllm.platforms import current_platform
 
 from ...utils import check_answers, prep_prompts
 
@@ -40,10 +41,17 @@ def test_sliding_window_retrieval(
     If we tell it upfront which we are going to be looking for, then
     it answers correctly (mostly).
     """
+    # NOTE: For ROCm, we have to enforce eager mode to use custom kernel
+    # implementation of GELU with tanh approximation, as PyTorch's native
+    # implementation is currently unstable with torch.compile and produces garbage.
+    enforce_eager = current_platform.is_rocm()
+
     test_config = model_config[model]
 
     llm = LLM(
-        model=model, disable_hybrid_kv_cache_manager=disable_hybrid_kv_cache_manager
+        model=model,
+        disable_hybrid_kv_cache_manager=disable_hybrid_kv_cache_manager,
+        enforce_eager=enforce_eager,
     )
     sampling_params = SamplingParams(temperature=0.0, max_tokens=100)