Question

我正在研究一个django项目。其中一个观点称为Popen（）。大部分时间一切正常。但偶尔Popen（）会因以下错误消息而失败：

Traceback (most recent call last):
  File "C:\***\views.py", line 116, in process_request
    proc = Popen(['python', exec_path, input_excel, current_tab, project])
  File "C:\Python34\lib\subprocess.py", line 754, in __init__
    _cleanup()
  File "C:\Python34\lib\subprocess.py", line 474, in _cleanup
    res = inst._internal_poll(_deadstate=sys.maxsize)
  File "C:\Python34\lib\subprocess.py", line 1146, in _internal_poll
    if _WaitForSingleObject(self._handle, 0) == _WAIT_OBJECT_0:
OSError: [WinError 6] The handle is invalid

重新启动服务器通常可以解决问题，但以后可能会再次显示。失败后立即尝试通常也会失败（用循环实现）。多次手动重新加载页面有时可以解决问题。

我也尝试了64位和32位python版本。问题显示在两者上。

似乎_cleanup（）管理用于避免僵尸进程的_active列表。考虑到我在Windows上，我在Popen（）中注释掉了_cleanup（），这似乎到目前为止工作正常。显然，这不是一个正确的解决方案。还有更好的主意吗？

更新

按照eryksun的建议，我仔细看了看手柄。由于某种原因，似乎django的autoreload.py关闭了进程句柄。请参阅下文了解详情。

---------------------------------------------------
try handle:

Handle(908)
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Python34\lib\site-packages\django\core\management\__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "C:\Python34\lib\site-packages\django\core\management\__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Python34\lib\site-packages\django\core\management\base.py", line 393, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Python34\lib\site-packages\django\core\management\commands\runserver.py", line 49, in execute
    super(Command, self).execute(*args, **options)
  File "C:\Python34\lib\site-packages\django\core\management\base.py", line 444, in execute
    output = self.handle(*args, **options)
  File "C:\Python34\lib\site-packages\django\core\management\commands\runserver.py", line 88, in handle
    self.run(**options)
  File "C:\Python34\lib\site-packages\django\core\management\commands\runserver.py", line 97, in run
    autoreload.main(self.inner_run, None, options)
  File "C:\Python34\lib\site-packages\django\utils\autoreload.py", line 325, in main
    reloader(wrapped_main_func, args, kwargs)
  File "C:\Python34\lib\site-packages\django\utils\autoreload.py", line 291, in python_reloader
    reloader_thread()
  File "C:\Python34\lib\site-packages\django\utils\autoreload.py", line 267, in reloader_thread
    change = fn()
  File "C:\Python34\lib\site-packages\django\utils\autoreload.py", line 204, in code_changed
    for filename in gen_filenames():
  File "C:\Python34\lib\site-packages\django\utils\autoreload.py", line 92, in gen_filenames
    _cached_filenames = clean_files(_cached_filenames)
  File "C:\Python34\lib\site-packages\django\utils\autoreload.py", line 139, in clean_files
    if os.path.exists(filename):
  File "C:\Python34\lib\genericpath.py", line 19, in exists
    os.stat(path)
  File "C:\Python34\lib\subprocess.py", line 452, in Close
    print(traceback.print_stack())
None
handle closed.
---------------------------------------------------

以上修改产生以上错误信息。

def Close(self, CloseHandle=_winapi.CloseHandle):
            print ('---------------------------------------------------')
            print ('try handle:')
            print (self)
            if not self.closed:
                self.closed = True
                CloseHandle(self)
                print(traceback.print_stack())
                print ('handle closed.')
            print ('---------------------------------------------------')

后来异常抱怨Handle（908）。我无法理解os.stat（path）如何关闭句柄以及为什么该进程不会被subprocess.py从_active列表中删除。

Popen（）失败，并且＃34; [WinError 6]句柄无效＆＃34;在_cleanup（）有时候

0 个答案: