File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 314, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 186, in dispatch
    req.session = Session(self.env, req)
  File "/usr/lib/python2.3/site-packages/trac/web/session.py", line 52, in __init__
    self.promote_session(sid)
  File "/usr/lib/python2.3/site-packages/trac/web/session.py", line 125, in promote_session
    "AND authenticated=0", (sid,))
  File "/usr/lib/python2.3/site-packages/trac/db/util.py", line 47, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "/usr/lib/python2.3/site-packages/trac/db/sqlite_backend.py", line 44, in execute
    args or [])
  File "/usr/lib/python2.3/site-packages/trac/db/sqlite_backend.py", line 36, in _rollback_on_error
    return function(self, *args, **kwargs)
OperationalError: database is locked