Fix process cleanup

Author: Ananto30

tests/utils.py

@@ -40,17 +40,21 @@ def _ping(port: int) -> bool:
 def kill_process(process: Process):
     pid = process.pid
     process.terminate()
-    process.kill()
-    _wait_for_process_to_die(process)
+    # allow the process a moment to exit cleanly
+    process.join(timeout=5)
+    if process.is_alive():
+        process.kill()
+        _wait_for_process_to_die(process, timeout=5)
     process.join()
     if pid and pid in process_map:
         del process_map[pid]
 
 
-def _wait_for_process_to_die(process, timeout: int = 5):
+def _wait_for_process_to_die(process, timeout: float = 5.0):
     start = time.time()
     while time.time() - start < timeout:
         if not process.is_alive():
+            process.join()
             return
         time.sleep(0.1)