Connection.sudo() sometimes raises ThreadException/OSError instead of AuthFailure

invoke.exceptions.ThreadException: 
Saw 1 exceptions within threads (OSError):


Thread args: {'kwargs': {'buffer_': ['[sudo] password: '],
            'hide': False,
            'output': <_io.TextIOWrapper name='<stderr>' mode='w' encoding='UTF-8'>},
 'target': <bound method Runner.handle_stderr of <fabric.runners.Remote object at 0x7f066e63a9e8>>}

Traceback (most recent call last):

  File "/home/amezin/test/.venv/lib/python3.6/site-packages/invoke/util.py", line 233, in run
    super(ExceptionHandlingThread, self).run()

  File "/usr/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)

  File "/home/amezin/test/.venv/lib/python3.6/site-packages/invoke/runners.py", line 750, in handle_stderr
    buffer_, hide, output, reader=self.read_proc_stderr

  File "/home/amezin/test/.venv/lib/python3.6/site-packages/invoke/runners.py", line 717, in _handle_output
    self.respond(buffer_)

  File "/home/amezin/test/.venv/lib/python3.6/site-packages/invoke/runners.py", line 884, in respond
    self.write_proc_stdin(response)

  File "/home/amezin/test/.venv/lib/python3.6/site-packages/invoke/runners.py", line 960, in write_proc_stdin
    self._write_proc_stdin(data.encode(self.encoding))

  File "/home/amezin/test/.venv/lib/python3.6/site-packages/fabric/runners.py", line 67, in _write_proc_stdin
    return self.channel.sendall(data)

  File "/home/amezin/test/.venv/lib/python3.6/site-packages/paramiko/channel.py", line 846, in sendall
    sent = self.send(s)

  File "/home/amezin/test/.venv/lib/python3.6/site-packages/paramiko/channel.py", line 801, in send
    return self._send(s, m)

  File "/home/amezin/test/.venv/lib/python3.6/site-packages/paramiko/channel.py", line 1198, in _send
    raise socket.error("Socket is closed")

OSError: Socket is closed

[matt-hayden]

I think what you might be seeing is a different error: I don’t think it’s getting to the sudo auth phase. I’m seeing this on Python 2.7 but only when stdin is redirected from /dev/null. Maybe try again with pty=True?

[luke-goddard]

@matt-hayden After hours of debugging you just saved me from a mental breakdown. I would also like to add that I only got this error while using multiprocessing.Process even if it’s just one process.