instance build failure when building from snapshot

Instance fails to build from a swift container. Error from Glance API:

2011-09-14 17:40:42 DEBUG [routes.middleware] Matched GET /images/16
2011-09-14 17:40:42 DEBUG [routes.middleware] Route path: '/images/:(id)', defaults: {'action': u'show', 'controller': <glance.common.wsgi.Resource object at 0x23f1e90>}
2011-09-14 17:40:42 DEBUG [routes.middleware] Match dict: {'action': u'show', 'controller': <glance.common.wsgi.Resource object at 0x23f1e90>, 'id': u'16'}
2011-09-14 17:40:42 DEBUG [glance.api.v1.images] image '16' is a cache MISS
2011-09-14 17:40:42 DEBUG [glance.api.v1.images] tee'ing image '16' into cache
2011-09-14 17:40:42 WARNING [glance.utils] xattrs not supported, skipping...
2011-09-14 17:40:42 DEBUG [glance.store.swift] Creating Swift connection with (auth_address=swift, user=user, key=blahblah, snet=False)
2011-09-14 17:40:43 DEBUG [eventlet.wsgi.server] Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/eventlet/wsgi.py", line 351, in handle_one_response
    write(''.join(towrite))
  File "/usr/lib/pymodules/python2.6/eventlet/wsgi.py", line 301, in write
    _writelines(towrite)
  File "/usr/lib/python2.6/socket.py", line 328, in writelines
    self.flush()
  File "/usr/lib/python2.6/socket.py", line 297, in flush
    self._sock.sendall(buffer(data, write_offset, buffer_size))
  File "/usr/lib/pymodules/python2.6/eventlet/greenio.py", line 283, in sendall
    tail = self.send(data, flags)
  File "/usr/lib/pymodules/python2.6/eventlet/greenio.py", line 269, in send
    total_sent += fd.send(data[total_sent:], flags)
error: [Errno 32] Broken pipe
2011-09-14 17:40:43 DEBUG [eventlet.wsgi.server] - - [14/Sep/2011 17:40:43] "GET /v1/images/16 HTTP/1.1" 200 263377 1.304464
2011-09-14 17:40:44 DEBUG [glance.api.middleware.version_negotiation] Processing request: GET / Accept:
2011-09-14 17:40:44 DEBUG [glance.api.middleware.version_negotiation] Unknown accept header: ...returning version choices.
2011-09-14 17:40:44 DEBUG [eventlet.wsgi.server] - - [14/Sep/2011 17:40:44] "GET / HTTP/1.0" 300 358 0.000812
2011-09-14 17:40:46 DEBUG [glance.api.middleware.version_negotiation] Processing request: GET / Accept:
2011-09-14 17:40:46 DEBUG [glance.api.middleware.version_negotiation] Unknown accept header: ...returning version choices.