2018-08-19T12:13:20+0200 [SSHService b'ssh-connection' on SSHServerTransport,12,154.127.249.12] Unhandled Error
        Traceback (most recent call last):
          File "/usr/lib/python3/dist-packages/twisted/internet/tcp.py", line 208, in doRead
            return self._dataReceived(data)
          File "/usr/lib/python3/dist-packages/twisted/internet/tcp.py", line 214, in _dataReceived
            rval = self.protocol.dataReceived(data)
          File "/usr/lib/python3/dist-packages/twisted/conch/ssh/transport.py", line 727, in dataReceived
            self.dispatchMessage(messageNum, packet[1:])
          File "/usr/lib/python3/dist-packages/twisted/conch/ssh/transport.py", line 752, in dispatchMessage
            messageNum, payload)
        --- exception caught here ---
          File "/usr/lib/python3/dist-packages/twisted/python/log.py", line 103, in callWithLogger
            return callWithContext({"system": lp}, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/log.py", line 86, in callWithContext
            return context.call({ILogContext: newCtx}, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 118, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 81, in callWithContext
            return func(*args,**kw)
          File "/usr/lib/python3/dist-packages/twisted/conch/ssh/service.py", line 45, in packetReceived
            return f(packet)
          File "/usr/lib/python3/dist-packages/twisted/conch/ssh/connection.py", line 231, in ssh_CHANNEL_DATA
            channel = self.channels[localChannel]
        builtins.KeyError: 0

$ stat /dev/null
Soubor: /dev/null
Velikost: 641520        Bloků: 1256       I/O blok: 4096   běžný soubor
Zařízení: 6h/6d I-uzel: 42002       Odkazů: 1
Práva: (0666/-rw-rw-rw-)  UID: (    0/    root)   GID: (    0/    root)
Přístup: 2018-08-19 12:10:13.425102650 +0200
Změna obsahu: 2018-08-19 12:10:25.475194746 +0200
Změna i-uzlu: 2018-08-19 12:10:25.475194746 +0200
Vznik: -

Souborový systém Velikost Užito Volno Uži% Připojeno do
devtmpfs             460M  460M     0 100% /dev

pi@raspberrypi:~ $ sudo du -ha /dev
80K     /dev/null
980K    /dev/null.1
980K    /dev/null.2
980K    /dev/null.3
980K    /dev/null.4
980K    /dev/null.5
720K    /dev/null.6
980K    /dev/null.7
980K    /dev/null.8
980K    /dev/null.9
980K    /dev/null.10
980K    /dev/null.11
980K    /dev/null.12
980K    /dev/null.13
980K    /dev/null.14
a tak dále