Seems like "all" is causing grief, although it is handled by inspect.isbuiltin()

I think the "ERROR" part of this trace is a different issue.

2011-08-27 03:05:24,701 ERROR nova.exception [-] Problem '<built-in function all> is not JSON serializable' attempting to send to notification system.
(nova.exception): TRACE: Traceback (most recent call last):
(nova.exception): TRACE:   File "/usr/lib/pymodules/python2.6/nova/notifier/api.py", line 95, in notify
(nova.exception): TRACE:     driver.notify(msg)
(nova.exception): TRACE:   File "/usr/lib/pymodules/python2.6/nova/notifier/rabbit_notifier.py", line 36, in notify
(nova.exception): TRACE:     rpc.cast(context, topic, message)
(nova.exception): TRACE:   File "/usr/lib/pymodules/python2.6/nova/rpc/__init__.py", line 58, in cast
(nova.exception): TRACE:     return RPCIMPL.cast(context, topic, msg)
(nova.exception): TRACE:   File "/usr/lib/pymodules/python2.6/nova/rpc/amqp.py", line 539, in cast
(nova.exception): TRACE:     publisher.send(msg)
(nova.exception): TRACE:   File "/usr/lib/pymodules/python2.6/carrot/messaging.py", line 758, in send
(nova.exception): TRACE:     serializer=serializer)
(nova.exception): TRACE:   File "/usr/lib/pymodules/python2.6/carrot/messaging.py", line 687, in create_message
(nova.exception): TRACE:     serializer=serializer)
(nova.exception): TRACE:   File "/usr/lib/pymodules/python2.6/carrot/serialization.py", line 144, in encode
(nova.exception): TRACE:     payload = encoder(data)
(nova.exception): TRACE:   File "/usr/lib/pymodules/python2.6/anyjson/__init__.py", line 123, in <lambda>
(nova.exception): TRACE:     serialize = lambda value: implementation.serialize(value)
(nova.exception): TRACE:   File "/usr/lib/pymodules/python2.6/anyjson/__init__.py", line 85, in serialize
(nova.exception): TRACE:     raise TypeError(*exc.args)
(nova.exception): TRACE: TypeError: <built-in function all> is not JSON serializable
(nova.exception): TRACE: 
2011-08-27 03:05:24,760 ERROR nova [-] Exception during message handling
(nova): TRACE: Traceback (most recent call last):
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/rpc/amqp.py", line 230, in _process_data
(nova): TRACE:     rval = node_func(context=ctxt, **node_args)
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/exception.py", line 98, in wrapped
(nova): TRACE:     return f(*args, **kw)
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/compute/manager.py", line 459, in run_instance
(nova): TRACE:     self._run_instance(context, instance_id, **kwargs)
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/compute/manager.py", line 414, in _run_instance
(nova): TRACE:     instance, vpn=is_vpn)
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/network/api.py", line 156, in allocate_for_instance
(nova): TRACE:     'args': args})
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/rpc/__init__.py", line 54, in call
(nova): TRACE:     return RPCIMPL.call(context, topic, msg)
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/rpc/amqp.py", line 527, in call
(nova): TRACE:     rv = list(rv)
(nova): TRACE:   File "/usr/lib/pymodules/python2.6/nova/rpc/amqp.py", line 516, in wait
(nova): TRACE:     raise result
(nova): TRACE: RemoteError: AttributeError 'NoneType' object has no attribute '_keymap'
(nova): TRACE: [u'Traceback (most recent call last):\n', u'  File "/usr/lib/pymodules/python2.6/nova/rpc/amqp.py", line 230, in _process_data\n    rval = node_func(context=ctxt, **node_args)\n', u'  File "/usr/lib/pymodules/python2.6/nova/network/manager.py", line 439, in allocate_for_instance\n    networks, vpn=vpn)\n', u'  File "/usr/lib/pymodules/python2.6/nova/network/manager.py", line 900, in _allocate_fixed_ips_hack\n    self.allocate_fixed_ip(context, instance_id, nw)\n', u'  File "/usr/lib/pymodules/python2.6/nova/network/manager.py", line 621, in allocate_fixed_ip\n    instance_id)\n', u'  File "/usr/lib/pymodules/python2.6/nova/db/api.py", line 342, in fixed_ip_associate_pool\n    instance_id, host)\n', u'  File "/usr/lib/pymodules/python2.6/nova/db/sqlalchemy/api.py", line 99, in wrapper\n    return f(*args, **kwargs)\n', u'  File "/usr/lib/pymodules/python2.6/nova/db/sqlalchemy/api.py", line 686, in fixed_ip_associate_pool\n    with_lockmode(\'update\').\\\n', u'  File "/usr/lib/python2.6/dist-packages/sqlalchemy/orm/query.py", line 1496, in first\n    ret = list(self[0:1])\n', u'  File "/usr/lib/python2.6/dist-packages/sqlalchemy/orm/query.py", line 1405, in __getitem__\n    return list(res)\n', u'  File "/usr/lib/python2.6/dist-packages/sqlalchemy/orm/query.py", line 1669, in instances\n    fetch = cursor.fetchall()\n', u'  File "/usr/lib/python2.6/dist-packages/sqlalchemy/engine/base.py", line 2383, in fetchall\n    l = self.process_rows(self._fetchall_impl())\n', u'  File "/usr/lib/python2.6/dist-packages/sqlalchemy/engine/base.py", line 2366, in process_rows\n    keymap = metadata._keymap\n', u"AttributeError: 'NoneType' object has no attribute '_keymap'\n"]