Public bug reported:

I'm seeing this in the regiond.log every time a system contacts the MAAS server 
as part of network booting. The enlistment continues successfully.

2018-05-08 16:06:48 maasserver.utils.dbtasks: [critical] Unhandled failure in 
database task.
        Traceback (most recent call last):
          File "/usr/lib/python3.6/threading.py", line 864, in run
            self._target(*self._args, **self._kwargs)
          File 
"/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 850, 
in worker
            return target()
          File 
"/usr/lib/python3/dist-packages/twisted/_threads/_threadworker.py", line 46, in 
work
            task()
          File "/usr/lib/python3/dist-packages/twisted/_threads/_team.py", line 
190, in doWork
            task()
        --- <exception caught here> ---
          File "/usr/lib/python3/dist-packages/twisted/python/threadpool.py", 
line 250, in inContext
            result = inContext.theWork()
          File "/usr/lib/python3/dist-packages/twisted/python/threadpool.py", 
line 266, in <lambda>
            inContext.theWork = lambda: context.call(ctx, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 
122, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 
85, in callWithContext
            return func(*args,**kw)
          File 
"/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 883, 
in callInContext
            return func(*args, **kwargs)
          File 
"/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 232, 
in wrapper
            result = func(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 
756, in call_within_transaction
            return func_outside_txn(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 
563, in retrier
            return func(*args, **kwargs)
          File "/usr/lib/python3.6/contextlib.py", line 52, in inner
            return func(*args, **kwds)
          File "/usr/lib/python3/dist-packages/maasserver/rpc/events.py", line 
88, in send_event_mac_address
            "address '%s'.", type_name, description, mac_address)
        builtins.TypeError: debug() takes from 1 to 2 positional arguments but 
5 were given
        
2018-05-08 16:06:48 maasserver.utils.dbtasks: [critical] Unhandled failure in 
database task.
        Traceback (most recent call last):
          File "/usr/lib/python3.6/threading.py", line 864, in run
            self._target(*self._args, **self._kwargs)
          File 
"/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 850, 
in worker
            return target()
          File 
"/usr/lib/python3/dist-packages/twisted/_threads/_threadworker.py", line 46, in 
work
            task()
          File "/usr/lib/python3/dist-packages/twisted/_threads/_team.py", line 
190, in doWork
            task()
        --- <exception caught here> ---
          File "/usr/lib/python3/dist-packages/twisted/python/threadpool.py", 
line 250, in inContext
            result = inContext.theWork()
          File "/usr/lib/python3/dist-packages/twisted/python/threadpool.py", 
line 266, in <lambda>
            inContext.theWork = lambda: context.call(ctx, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 
122, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 
85, in callWithContext
            return func(*args,**kw)
          File 
"/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 883, 
in callInContext
            return func(*args, **kwargs)
          File 
"/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 232, 
in wrapper
            result = func(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 
756, in call_within_transaction
            return func_outside_txn(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 
563, in retrier
            return func(*args, **kwargs)
          File "/usr/lib/python3.6/contextlib.py", line 52, in inner
            return func(*args, **kwds)
          File "/usr/lib/python3/dist-packages/maasserver/rpc/events.py", line 
88, in send_event_mac_address
            "address '%s'.", type_name, description, mac_address)
        builtins.TypeError: debug() takes from 1 to 2 positional arguments but 
5 were given
        
2018-05-08 16:06:49 maasserver.utils.dbtasks: [critical] Unhandled failure in 
database task.
        Traceback (most recent call last):
          File "/usr/lib/python3.6/threading.py", line 864, in run
            self._target(*self._args, **self._kwargs)
          File 
"/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 850, 
in worker
            return target()
          File 
"/usr/lib/python3/dist-packages/twisted/_threads/_threadworker.py", line 46, in 
work
            task()
          File "/usr/lib/python3/dist-packages/twisted/_threads/_team.py", line 
190, in doWork
            task()
        --- <exception caught here> ---
          File "/usr/lib/python3/dist-packages/twisted/python/threadpool.py", 
line 250, in inContext
            result = inContext.theWork()
          File "/usr/lib/python3/dist-packages/twisted/python/threadpool.py", 
line 266, in <lambda>
            inContext.theWork = lambda: context.call(ctx, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 
122, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 
85, in callWithContext
            return func(*args,**kw)
          File 
"/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 883, 
in callInContext
            return func(*args, **kwargs)
          File 
"/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 232, 
in wrapper
            result = func(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 
756, in call_within_transaction
            return func_outside_txn(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 
563, in retrier
            return func(*args, **kwargs)
          File "/usr/lib/python3.6/contextlib.py", line 52, in inner
            return func(*args, **kwds)
          File "/usr/lib/python3/dist-packages/maasserver/rpc/events.py", line 
88, in send_event_mac_address
            "address '%s'.", type_name, description, mac_address)
        builtins.TypeError: debug() takes from 1 to 2 positional arguments but 
5 were given

** Affects: maas
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1769929

Title:
  [2.4b3] traceback while enlisting

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