fix bug

src/execution.py

@@ -74,7 +74,7 @@ def unsafe_execute(tmp_dir, language_type, timeout, sample, result, task_id):
             chdir = os.chdir
 
             # Disable functionalities that can make destructive changes to the test.
-            # reliability_guard()
+            reliability_guard()
 
             try:
                 exec_globals = {}
@@ -537,8 +537,8 @@ def reliability_guard(maximum_memory_bytes: Optional[int] = None):
     shutil.move = None
     shutil.chown = None
 
-    import subprocess
-    subprocess.Popen = None  # type: ignore
+    # import subprocess
+    # subprocess.Popen = None  # type: ignore
 
     __builtins__['help'] = None