[CI] Fix failed CI step "PyTorch Compilation Unit Tests"

tests/utils.py

@@ -1557,16 +1557,18 @@ def wrapper(*args: _P.args, **kwargs: _P.kwargs) -> None:
             )
 
             if result.returncode != 0:
-                # Read traceback written by child, fall back to stderr
-                tb = ""
+                # Read traceback written by child; stderr is shown separately
+                tb = "(no traceback file written)"
                 if os.path.exists(tb_file) and os.path.getsize(tb_file) > 0:
                     with open(tb_file) as fp:
                         tb = fp.read()
-                else:
-                    tb = result.stderr.decode()
+                stdout = result.stdout.decode(errors="replace")
+                stderr = result.stderr.decode(errors="replace")
                 raise RuntimeError(
                     f"Test subprocess '{f.__name__}' failed "
                     f"(exit code {result.returncode}):\n{tb}"
+                    f"\n=== child stdout ===\n{stdout}"
+                    f"\n=== child stderr ===\n{stderr}"
                 )
         finally:
             with contextlib.suppress(OSError):

vllm/compilation/compiler_interface.py

@@ -141,6 +141,7 @@ class AlwaysHitShapeEnv:
 
     def __init__(self) -> None:
         self.guards: list[Any] = []
+        self.var_to_hint_override: dict[Any, int] = {}
 
     def evaluate_guards_expression(self, *args: Any, **kwargs: Any) -> Literal[True]:
         return True