Kill Chromium processes properly to avoid defunct/zombie processes

src/undetected_chromedriver/__init__.py

@@ -599,7 +599,8 @@ class Chrome(selenium.webdriver.chrome.webdriver.WebDriver):
     def quit(self):
         logger.debug("closing webdriver")
         if hasattr(self, "service") and getattr(self.service, "process", None):
-            self.service.process.kill()
+            self.service.process.terminate()
+            self.service.process.wait(5)
         try:
             if self.reactor and isinstance(self.reactor, Reactor):
                 logger.debug("shutting down reactor")

src/undetected_chromedriver/dprocess.py

@@ -27,12 +27,14 @@ def start_detached(executable, *args):
     reader, writer = multiprocessing.Pipe(False)
 
     # do not keep reference
-    multiprocessing.Process(
+    process = multiprocessing.Process(
         target=_start_detached,
         args=(executable, *args),
         kwargs={"writer": writer},
         daemon=True,
-    ).start()
+    )
+    process.start()
+    process.join()
     # receive pid from pipe
     pid = reader.recv()
     REGISTERED.append(pid)