2011-07-18T08:13:50 ERROR root Exception during task
Traceback (most recent call last):
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.server-3.6.1-py2.6.egg/zope/server/taskthreads.py", line 48, in handlerThread
    task.service()
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.server-3.6.1-py2.6.egg/zope/server/serverchannelbase.py", line 207, in service
    task.service()
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.server-3.6.1-py2.6.egg/zope/server/http/httptask.py", line 71, in service
    self.channel.server.executeRequest(self)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zc.zservertracelog-1.1.5-py2.6.egg/zc/zservertracelog/tracelog.py", line 114, in executeRequest
    response = self.application(env, start_response)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.app.wsgi-3.6.0-py2.6.egg/zope/app/wsgi/__init__.py", line 58, in __call__
    request = publish(request, handle_errors=handle_errors)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.publisher-3.12.0-py2.6.egg/zope/publisher/publish.py", line 144, in publish
    obj, request, exc_info, True)
  File "/srv/launchpad.net/production/launchpad-rev-13453/lib/canonical/launchpad/webapp/publication.py", line 600, in handleException
    db_policy = store_selector.pop()
  File "/srv/launchpad.net/production/launchpad-rev-13453/lib/canonical/launchpad/webapp/adapter.py", line 684, in pop
    db_policy.uninstall()
  File "/srv/launchpad.net/production/launchpad-rev-13453/lib/canonical/launchpad/webapp/dbpolicy.py", line 305, in uninstall
    session_data = ISession(self.request)['lp.dbpolicy']
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.session-3.9.1-py2.6.egg/zope/session/session.py", line 433, in __getitem__
    sd = sdc[self.client_id]
  File "/srv/launchpad.net/production/launchpad-rev-13453/lib/canonical/launchpad/webapp/pgsession.py", line 74, in __getitem__
    return PGSessionData(self, client_id)
  File "/srv/launchpad.net/production/launchpad-rev-13453/lib/canonical/launchpad/webapp/pgsession.py", line 104, in __init__
    self.store.execute(query, (self.client_id,), noresult=True)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/store.py", line 108, in execute
    return self._connection.execute(statement, params, noresult)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/databases/postgres.py", line 249, in execute
    return Connection.execute(self, statement, params, noresult)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/database.py", line 229, in execute
    self._event.emit("register-transaction")
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/zope/zstorm.py", line 219, in register_store_with_transaction
    zstorm.transaction_manager.get().join(data_manager)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/transaction-1.0.0-py2.6.egg/transaction/_transaction.py", line 213, in join
    self._prior_operation_failed() # doesn't return
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/transaction-1.0.0-py2.6.egg/transaction/_transaction.py", line 209, in _prior_operation_failed
    self._failure_traceback.getvalue())
TransactionFailedError: An operation previously failed, with traceback:

  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.server-3.6.1-py2.6.egg/zope/server/taskthreads.py", line 48, in handlerThread
    task.service()
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.server-3.6.1-py2.6.egg/zope/server/serverchannelbase.py", line 207, in service
    task.service()
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.server-3.6.1-py2.6.egg/zope/server/http/httptask.py", line 71, in service
    self.channel.server.executeRequest(self)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zc.zservertracelog-1.1.5-py2.6.egg/zc/zservertracelog/tracelog.py", line 114, in executeRequest
    response = self.application(env, start_response)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.app.wsgi-3.6.0-py2.6.egg/zope/app/wsgi/__init__.py", line 58, in __call__
    request = publish(request, handle_errors=handle_errors)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/zope.publisher-3.12.0-py2.6.egg/zope/publisher/publish.py", line 139, in publish
    publication.afterCall(request, obj)
  File "/srv/launchpad.net/production/launchpad-rev-13453/lib/canonical/launchpad/webapp/publication.py", line 539, in afterCall
    txn.commit()
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/transaction-1.0.0-py2.6.egg/transaction/_transaction.py", line 325, in commit
    t, v, tb = self._saveAndGetCommitishError()
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/transaction-1.0.0-py2.6.egg/transaction/_transaction.py", line 322, in commit
    self._commitResources()
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/transaction-1.0.0-py2.6.egg/transaction/_transaction.py", line 414, in _commitResources
    rm.tpc_begin(self)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/zope/zstorm.py", line 251, in tpc_begin
    self._store.flush()
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/store.py", line 503, in flush
    self._flush_one(obj_info)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/store.py", line 560, in _flush_one
    self._connection.execute(expr, noresult=True)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/databases/postgres.py", line 249, in execute
    return Connection.execute(self, statement, params, noresult)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/database.py", line 237, in execute
    raw_cursor = self.raw_execute(statement, params)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/databases/postgres.py", line 259, in raw_execute
    return Connection.raw_execute(self, statement, params)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/database.py", line 321, in raw_execute
    self._check_disconnect(raw_cursor.execute, *args)
  File "/srv/launchpad.net/production/launchpad-rev-13453/eggs/storm-0.18.0.99_lpwithnodatetime_r393-py2.6-linux-x86_64.egg/storm/database.py", line 366, in _check_disconnect
    return function(*args, **kwargs)
IntegrityError: new row for relation "potemplate" violates check constraint "valid_link"