[Bugfix] Validate --stage-overrides shape in parse_stage_overrides (drop field allowlist) (#6230)

Signed-off-by: Chiquan Mo <mcigggg399026@gmail.com>
Signed-off-by: MciG-ggg <MciG-ggg@users.noreply.github.com>
Co-authored-by: MciG-ggg <MciG-ggg@users.noreply.github.com>

tests/entrypoints/test_utils.py

@@ -3,6 +3,7 @@
 
 """Unit tests for vllm_omni.entrypoints.utils module."""
 
+import logging
 import os
 from collections import Counter
 from dataclasses import dataclass
@@ -255,8 +256,12 @@ class TestFilterDataclassKwargs:
         with pytest.raises(ValueError, match="kwargs must be a dictionary"):
             filter_dataclass_kwargs(SimpleConfig, "invalid")
 
-    def test_filters_omni_engine_args_unknown_fields(self):
-        """Test that OmniEngineArgs kwargs are filtered to valid fields only."""
+    def test_filters_omni_engine_args_unknown_fields(self, caplog):
+        """Test that OmniEngineArgs kwargs are filtered to valid fields only,
+        and that the WARNING contract fires for every drop — the affordance
+        that lets a ``--stage-overrides`` typo (``{"0":{"kv_cache_dtpye":...}}``)
+        surface in the log rather than being silently misapplied downstream.
+        """
         kwargs = {
             "model": "dummy",
             "stage_id": 1,
@@ -264,12 +269,16 @@ class TestFilterDataclassKwargs:
             "unknown_field": "drop_me",
         }
 
-        result = filter_dataclass_kwargs(OmniEngineArgs, kwargs)
+        with caplog.at_level(logging.WARNING, logger="vllm_omni.entrypoints.utils"):
+            result = filter_dataclass_kwargs(OmniEngineArgs, kwargs)
 
         assert "model" in result
         assert "stage_id" in result
         assert "engine_output_type" in result
         assert "unknown_field" not in result
+        assert any(rec.levelno == logging.WARNING and "unknown_field" in rec.message for rec in caplog.records), (
+            f"expected WARNING naming 'unknown_field'; got {[r.message for r in caplog.records]}"
+        )
 
     def test_filters_omni_diffusion_config_union_dataclass(self):
         """Test that OmniDiffusionConfig filters nested dataclass in Union fields."""