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()

```

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

{"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"}]}