____________________ test_tls_comm_closed_explicit[tornado] ____________________

tcp = <module 'distributed.comm.tcp' from '/home/runner/work/distributed/distributed/distributed/comm/tcp.py'>

    @pytest.mark.asyncio
    async def test_tls_comm_closed_explicit(tcp):
>       await check_comm_closed_explicit("tls://127.0.0.1", **tls_kwargs)

distributed/comm/tests/test_comms.py:774: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
distributed/comm/tests/test_comms.py:753: in check_comm_closed_explicit
    await b_read
distributed/comm/tcp.py:205: in read
    frames_nbytes = await stream.read_bytes(fmt_size)
/usr/share/miniconda3/envs/dask-distributed/lib/python3.7/site-packages/tornado/iostream.py:441: in read_bytes
    self._try_inline_read()
/usr/share/miniconda3/envs/dask-distributed/lib/python3.7/site-packages/tornado/iostream.py:913: in _try_inline_read
    pos = self._read_to_buffer_loop()
/usr/share/miniconda3/envs/dask-distributed/lib/python3.7/site-packages/tornado/iostream.py:815: in _read_to_buffer_loop
    if self._read_to_buffer() == 0:
/usr/share/miniconda3/envs/dask-distributed/lib/python3.7/site-packages/tornado/iostream.py:945: in _read_to_buffer
    bytes_read = self.read_from_fd(buf)
/usr/share/miniconda3/envs/dask-distributed/lib/python3.7/site-packages/tornado/iostream.py:1690: in read_from_fd
    return self.socket.recv_into(buf)
/usr/share/miniconda3/envs/dask-distributed/lib/python3.7/ssl.py:1071: in recv_into
    return self.read(nbytes, buffer)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <ssl.SSLSocket [closed] fd=-1, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6>
len = 65536
buffer = bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x...0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')

    def read(self, len=1024, buffer=None):
        """Read up to LEN bytes and return them.
        Return zero-length string on EOF."""
    
        self._checkClosed()
        if self._sslobj is None:
            raise ValueError("Read on closed or unwrapped SSL socket.")
        try:
            if buffer is not None:
>               return self._sslobj.read(len, buffer)
E               ssl.SSLError: [SSL: KRB5_S_TKT_NYV] unexpected eof while reading (_ssl.c:2570)

/usr/share/miniconda3/envs/dask-distributed/lib/python3.7/ssl.py:929: SSLError