prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Can't start Buildbot master
  Ansible updated buildbot.buildbot.net to the latest commit (81d1179e5a) and it quickly gets this in `twisted.log`
  ```
  2021-05-15 02:23:55+0000 [-] while starting BuildMaster
          Traceback (most recent call last):
          --- <exception caught here> ---
            File "/usr/home/bbuser/buildbot/master/buildbot/master.py", line 300, in startService
              yield self.reconfigServiceWithBuildbotConfig(self.config)
            File "/usr/home/bbuser/buildbot/master/buildbot/util/service.py", line 49, in reconfigServiceW
  ithBuildbotConfig
              yield svc.reconfigServiceWithBuildbotConfig(new_config)
            File "/usr/home/bbuser/buildbot/master/buildbot/process/measured_service.py", line 31, in reco
  nfigServiceWithBuildbotConfig
              yield super().reconfigServiceWithBuildbotConfig(new_config)
            File "/usr/home/bbuser/buildbot/master/buildbot/util/service.py", line 507, in reconfigService
  WithBuildbotConfig
              yield child.setServiceParent(self)
            File "/usr/home/bbuser/buildbot/master/buildbot/util/service.py", line 64, in setServiceParent
              yield self.parent.addService(self)
            File "/usr/home/bbuser/buildbot/master/buildbot/worker/base.py", line 262, in startService
              yield super().startService()
            File "/usr/home/bbuser/buildbot/master/buildbot/util/service.py", line 244, in startService
              yield super().startService()
          twisted.internet.defer.FirstError: FirstError[#0, [Failure instance: Traceback: <class 'TypeError'>: __init__() takes 2 positional arguments but 3 were given
          /usr/home/bbuser/buildbot/master/buildbot/util/service.py:94:startService
          /home/bbuser/venv/lib/python3.6/site-packages/twisted/internet/defer.py:151:maybeDeferred
          /home/bbuser/venv/lib/python3.6/site-packages/twisted/internet/defer.py:1613:unwindGenerator
          /home/bbuser/venv/lib/python3.6/site-packages/twisted/internet/defer.py:1529:_cancellableInlineCallbacks
          --- <exception caught here> ---
          /home/bbuser/venv/lib/python3.6/site-packages/twisted/internet/defer.py:1418:_inlineCallbacks
          /home/bbuser/venv/lib/python3.6/site-packages/buildbot_worker/null.py:34:startService
          ]]
  ```
  
  I reset to the previous merge, 1b16975313, and now it runs fine.
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `master/buildbot/worker/protocols/null.py`
  Content:
  ```
  1 # This file is part of Buildbot.  Buildbot is free software: you can
  2 # redistribute it and/or modify it under the terms of the GNU General Public
  3 # License as published by the Free Software Foundation, version 2.
  4 #
  5 # This program is distributed in the hope that it will be useful, but WITHOUT
  6 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  7 # FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  8 # details.
  9 #
  10 # You should have received a copy of the GNU General Public License along with
  11 # this program; if not, write to the Free Software Foundation, Inc., 51
  12 # Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  13 #
  14 # Copyright Buildbot Team Members
  15 
  16 
  17 from twisted.internet import defer
  18 from twisted.python import log
  19 
  20 from buildbot.util.eventual import fireEventually
  21 from buildbot.worker.protocols import base
  22 
  23 
  24 class Listener(base.Listener):
  25     pass
  26 
  27 
  28 class ProxyMixin():
  29 
  30     def __init__(self, impl):
  31         assert isinstance(impl, self.ImplClass)
  32         self.impl = impl
  33         self._disconnect_listeners = []
  34 
  35     def callRemote(self, message, *args, **kw):
  36         method = getattr(self.impl, "remote_{}".format(message), None)
  37         if method is None:
  38             raise AttributeError("No such method: remote_{}".format(message))
  39         try:
  40             state = method(*args, **kw)
  41         except TypeError:
  42             log.msg("{} didn't accept {} and {}".format(method, args, kw))
  43             raise
  44         # break callback recursion for large transfers by using fireEventually
  45         return fireEventually(state)
  46 
  47     def notifyOnDisconnect(self, cb):
  48         pass
  49 
  50     def dontNotifyOnDisconnect(self, cb):
  51         pass
  52 
  53 
  54 # just add ProxyMixin capability to the RemoteCommandProxy
  55 # so that callers of callRemote actually directly call the proper method
  56 class RemoteCommandProxy(ProxyMixin):
  57     ImplClass = base.RemoteCommandImpl
  58 
  59 
  60 class FileReaderProxy(ProxyMixin):
  61     ImplClass = base.FileReaderImpl
  62 
  63 
  64 class FileWriterProxy(ProxyMixin):
  65     ImplClass = base.FileWriterImpl
  66 
  67 
  68 class Connection(base.Connection):
  69     proxies = {base.FileWriterImpl: FileWriterProxy,
  70                base.FileReaderImpl: FileReaderProxy}
  71 
  72     def __init__(self, worker):
  73         super().__init__(worker.workername)
  74         self.worker = worker
  75 
  76     def loseConnection(self):
  77         self.notifyDisconnected()
  78 
  79     def remotePrint(self, message):
  80         return defer.maybeDeferred(self.worker.bot.remote_print, message)
  81 
  82     def remoteGetWorkerInfo(self):
  83         return defer.maybeDeferred(self.worker.bot.remote_getWorkerInfo)
  84 
  85     def remoteSetBuilderList(self, builders):
  86         return defer.maybeDeferred(self.worker.bot.remote_setBuilderList, builders)
  87 
  88     def remoteStartCommand(self, remoteCommand, builderName, commandId, commandName, args):
  89         remoteCommand = RemoteCommandProxy(remoteCommand)
  90         args = self.createArgsProxies(args)
  91         workerforbuilder = self.worker.bot.builders[builderName]
  92         return defer.maybeDeferred(workerforbuilder.remote_startCommand, remoteCommand,
  93                                    commandId, commandName, args)
  94 
  95     def remoteShutdown(self):
  96         return defer.maybeDeferred(self.worker.stopService)
  97 
  98     def remoteStartBuild(self, builderName):
  99         return defer.succeed(self.worker.bot.builders[builderName].remote_startBuild())
  100 
  101     def remoteInterruptCommand(self, builderName, commandId, why):
  102         workerforbuilder = self.worker.bot.builders[builderName]
  103         return defer.maybeDeferred(workerforbuilder.remote_interruptCommand, commandId, why)
  104
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/master/buildbot/worker/protocols/null.py b/master/buildbot/worker/protocols/null.py
  --- a/master/buildbot/worker/protocols/null.py
  +++ b/master/buildbot/worker/protocols/null.py
  @@ -18,6 +18,7 @@
   from twisted.python import log
   
   from buildbot.util.eventual import fireEventually
  +from buildbot.warnings import warn_deprecated
   from buildbot.worker.protocols import base
   
   
  @@ -69,7 +70,15 @@
       proxies = {base.FileWriterImpl: FileWriterProxy,
                  base.FileReaderImpl: FileReaderProxy}
   
  -    def __init__(self, worker):
  +    def __init__(self, master_or_worker, worker=None):
  +        # All the existing code passes just the name to the Connection, however we'll need to
  +        # support an older versions of buildbot-worker using two parameter signature for some time.
  +        if worker is None:
  +            worker = master_or_worker
  +        else:
  +            warn_deprecated('3.2.0', 'LocalWorker: Using different version of buildbot-worker ' +
  +                            'than buildbot is not supported')
  +
           super().__init__(worker.workername)
           self.worker = worker
  
verification_info: {"golden_diff": "diff --git a/master/buildbot/worker/protocols/null.py b/master/buildbot/worker/protocols/null.py\n--- a/master/buildbot/worker/protocols/null.py\n+++ b/master/buildbot/worker/protocols/null.py\n@@ -18,6 +18,7 @@\n from twisted.python import log\n \n from buildbot.util.eventual import fireEventually\n+from buildbot.warnings import warn_deprecated\n from buildbot.worker.protocols import base\n \n \n@@ -69,7 +70,15 @@\n     proxies = {base.FileWriterImpl: FileWriterProxy,\n                base.FileReaderImpl: FileReaderProxy}\n \n-    def __init__(self, worker):\n+    def __init__(self, master_or_worker, worker=None):\n+        # All the existing code passes just the name to the Connection, however we'll need to\n+        # support an older versions of buildbot-worker using two parameter signature for some time.\n+        if worker is None:\n+            worker = master_or_worker\n+        else:\n+            warn_deprecated('3.2.0', 'LocalWorker: Using different version of buildbot-worker ' +\n+                            'than buildbot is not supported')\n+\n         super().__init__(worker.workername)\n         self.worker = worker\n", "issue": "Can't start Buildbot master\nAnsible updated buildbot.buildbot.net to the latest commit (81d1179e5a) and it quickly gets this in `twisted.log`\r\n```\r\n2021-05-15 02:23:55+0000 [-] while starting BuildMaster\r\n        Traceback (most recent call last):\r\n        --- <exception caught here> ---\r\n          File \"/usr/home/bbuser/buildbot/master/buildbot/master.py\", line 300, in startService\r\n            yield self.reconfigServiceWithBuildbotConfig(self.config)\r\n          File \"/usr/home/bbuser/buildbot/master/buildbot/util/service.py\", line 49, in reconfigServiceW\r\nithBuildbotConfig\r\n            yield svc.reconfigServiceWithBuildbotConfig(new_config)\r\n          File \"/usr/home/bbuser/buildbot/master/buildbot/process/measured_service.py\", line 31, in reco\r\nnfigServiceWithBuildbotConfig\r\n            yield super().reconfigServiceWithBuildbotConfig(new_config)\r\n          File \"/usr/home/bbuser/buildbot/master/buildbot/util/service.py\", line 507, in reconfigService\r\nWithBuildbotConfig\r\n            yield child.setServiceParent(self)\r\n          File \"/usr/home/bbuser/buildbot/master/buildbot/util/service.py\", line 64, in setServiceParent\r\n            yield self.parent.addService(self)\r\n          File \"/usr/home/bbuser/buildbot/master/buildbot/worker/base.py\", line 262, in startService\r\n            yield super().startService()\r\n          File \"/usr/home/bbuser/buildbot/master/buildbot/util/service.py\", line 244, in startService\r\n            yield super().startService()\r\n        twisted.internet.defer.FirstError: FirstError[#0, [Failure instance: Traceback: <class 'TypeError'>: __init__() takes 2 positional arguments but 3 were given\r\n        /usr/home/bbuser/buildbot/master/buildbot/util/service.py:94:startService\r\n        /home/bbuser/venv/lib/python3.6/site-packages/twisted/internet/defer.py:151:maybeDeferred\r\n        /home/bbuser/venv/lib/python3.6/site-packages/twisted/internet/defer.py:1613:unwindGenerator\r\n        /home/bbuser/venv/lib/python3.6/site-packages/twisted/internet/defer.py:1529:_cancellableInlineCallbacks\r\n        --- <exception caught here> ---\r\n        /home/bbuser/venv/lib/python3.6/site-packages/twisted/internet/defer.py:1418:_inlineCallbacks\r\n        /home/bbuser/venv/lib/python3.6/site-packages/buildbot_worker/null.py:34:startService\r\n        ]]\r\n```\r\n\r\nI reset to the previous merge, 1b16975313, and now it runs fine.\n", "before_files": [{"content": "# This file is part of Buildbot.  Buildbot is free software: you can\n# redistribute it and/or modify it under the terms of the GNU General Public\n# License as published by the Free Software Foundation, version 2.\n#\n# This program is distributed in the hope that it will be useful, but WITHOUT\n# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\n# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\n# details.\n#\n# You should have received a copy of the GNU General Public License along with\n# this program; if not, write to the Free Software Foundation, Inc., 51\n# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n#\n# Copyright Buildbot Team Members\n\n\nfrom twisted.internet import defer\nfrom twisted.python import log\n\nfrom buildbot.util.eventual import fireEventually\nfrom buildbot.worker.protocols import base\n\n\nclass Listener(base.Listener):\n    pass\n\n\nclass ProxyMixin():\n\n    def __init__(self, impl):\n        assert isinstance(impl, self.ImplClass)\n        self.impl = impl\n        self._disconnect_listeners = []\n\n    def callRemote(self, message, *args, **kw):\n        method = getattr(self.impl, \"remote_{}\".format(message), None)\n        if method is None:\n            raise AttributeError(\"No such method: remote_{}\".format(message))\n        try:\n            state = method(*args, **kw)\n        except TypeError:\n            log.msg(\"{} didn't accept {} and {}\".format(method, args, kw))\n            raise\n        # break callback recursion for large transfers by using fireEventually\n        return fireEventually(state)\n\n    def notifyOnDisconnect(self, cb):\n        pass\n\n    def dontNotifyOnDisconnect(self, cb):\n        pass\n\n\n# just add ProxyMixin capability to the RemoteCommandProxy\n# so that callers of callRemote actually directly call the proper method\nclass RemoteCommandProxy(ProxyMixin):\n    ImplClass = base.RemoteCommandImpl\n\n\nclass FileReaderProxy(ProxyMixin):\n    ImplClass = base.FileReaderImpl\n\n\nclass FileWriterProxy(ProxyMixin):\n    ImplClass = base.FileWriterImpl\n\n\nclass Connection(base.Connection):\n    proxies = {base.FileWriterImpl: FileWriterProxy,\n               base.FileReaderImpl: FileReaderProxy}\n\n    def __init__(self, worker):\n        super().__init__(worker.workername)\n        self.worker = worker\n\n    def loseConnection(self):\n        self.notifyDisconnected()\n\n    def remotePrint(self, message):\n        return defer.maybeDeferred(self.worker.bot.remote_print, message)\n\n    def remoteGetWorkerInfo(self):\n        return defer.maybeDeferred(self.worker.bot.remote_getWorkerInfo)\n\n    def remoteSetBuilderList(self, builders):\n        return defer.maybeDeferred(self.worker.bot.remote_setBuilderList, builders)\n\n    def remoteStartCommand(self, remoteCommand, builderName, commandId, commandName, args):\n        remoteCommand = RemoteCommandProxy(remoteCommand)\n        args = self.createArgsProxies(args)\n        workerforbuilder = self.worker.bot.builders[builderName]\n        return defer.maybeDeferred(workerforbuilder.remote_startCommand, remoteCommand,\n                                   commandId, commandName, args)\n\n    def remoteShutdown(self):\n        return defer.maybeDeferred(self.worker.stopService)\n\n    def remoteStartBuild(self, builderName):\n        return defer.succeed(self.worker.bot.builders[builderName].remote_startBuild())\n\n    def remoteInterruptCommand(self, builderName, commandId, why):\n        workerforbuilder = self.worker.bot.builders[builderName]\n        return defer.maybeDeferred(workerforbuilder.remote_interruptCommand, commandId, why)\n", "path": "master/buildbot/worker/protocols/null.py"}], "after_files": [{"content": "# This file is part of Buildbot.  Buildbot is free software: you can\n# redistribute it and/or modify it under the terms of the GNU General Public\n# License as published by the Free Software Foundation, version 2.\n#\n# This program is distributed in the hope that it will be useful, but WITHOUT\n# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\n# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\n# details.\n#\n# You should have received a copy of the GNU General Public License along with\n# this program; if not, write to the Free Software Foundation, Inc., 51\n# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n#\n# Copyright Buildbot Team Members\n\n\nfrom twisted.internet import defer\nfrom twisted.python import log\n\nfrom buildbot.util.eventual import fireEventually\nfrom buildbot.warnings import warn_deprecated\nfrom buildbot.worker.protocols import base\n\n\nclass Listener(base.Listener):\n    pass\n\n\nclass ProxyMixin():\n\n    def __init__(self, impl):\n        assert isinstance(impl, self.ImplClass)\n        self.impl = impl\n        self._disconnect_listeners = []\n\n    def callRemote(self, message, *args, **kw):\n        method = getattr(self.impl, \"remote_{}\".format(message), None)\n        if method is None:\n            raise AttributeError(\"No such method: remote_{}\".format(message))\n        try:\n            state = method(*args, **kw)\n        except TypeError:\n            log.msg(\"{} didn't accept {} and {}\".format(method, args, kw))\n            raise\n        # break callback recursion for large transfers by using fireEventually\n        return fireEventually(state)\n\n    def notifyOnDisconnect(self, cb):\n        pass\n\n    def dontNotifyOnDisconnect(self, cb):\n        pass\n\n\n# just add ProxyMixin capability to the RemoteCommandProxy\n# so that callers of callRemote actually directly call the proper method\nclass RemoteCommandProxy(ProxyMixin):\n    ImplClass = base.RemoteCommandImpl\n\n\nclass FileReaderProxy(ProxyMixin):\n    ImplClass = base.FileReaderImpl\n\n\nclass FileWriterProxy(ProxyMixin):\n    ImplClass = base.FileWriterImpl\n\n\nclass Connection(base.Connection):\n    proxies = {base.FileWriterImpl: FileWriterProxy,\n               base.FileReaderImpl: FileReaderProxy}\n\n    def __init__(self, master_or_worker, worker=None):\n        # All the existing code passes just the name to the Connection, however we'll need to\n        # support an older versions of buildbot-worker using two parameter signature for some time.\n        if worker is None:\n            worker = master_or_worker\n        else:\n            warn_deprecated('3.2.0', 'LocalWorker: Using different version of buildbot-worker ' +\n                            'than buildbot is not supported')\n\n        super().__init__(worker.workername)\n        self.worker = worker\n\n    def loseConnection(self):\n        self.notifyDisconnected()\n\n    def remotePrint(self, message):\n        return defer.maybeDeferred(self.worker.bot.remote_print, message)\n\n    def remoteGetWorkerInfo(self):\n        return defer.maybeDeferred(self.worker.bot.remote_getWorkerInfo)\n\n    def remoteSetBuilderList(self, builders):\n        return defer.maybeDeferred(self.worker.bot.remote_setBuilderList, builders)\n\n    def remoteStartCommand(self, remoteCommand, builderName, commandId, commandName, args):\n        remoteCommand = RemoteCommandProxy(remoteCommand)\n        args = self.createArgsProxies(args)\n        workerforbuilder = self.worker.bot.builders[builderName]\n        return defer.maybeDeferred(workerforbuilder.remote_startCommand, remoteCommand,\n                                   commandId, commandName, args)\n\n    def remoteShutdown(self):\n        return defer.maybeDeferred(self.worker.stopService)\n\n    def remoteStartBuild(self, builderName):\n        return defer.succeed(self.worker.bot.builders[builderName].remote_startBuild())\n\n    def remoteInterruptCommand(self, builderName, commandId, why):\n        workerforbuilder = self.worker.bot.builders[builderName]\n        return defer.maybeDeferred(workerforbuilder.remote_interruptCommand, commandId, why)\n", "path": "master/buildbot/worker/protocols/null.py"}]}