-bash-4.1$ ipython
Traceback (most recent call last):
  File "/usr/bin/ipython", line 7, in <module>
    launch_new_instance()
  File "/usr/lib/python2.6/site-packages/IPython/frontend/terminal/ipapp.py", line 388, in launch_new_instance
    app.initialize()
  File "<string>", line 2, in initialize
  File "/usr/lib/python2.6/site-packages/IPython/config/application.py", line 84, in catch_config_error
    return method(app, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/IPython/frontend/terminal/ipapp.py", line 324, in initialize
    self.init_shell()
  File "/usr/lib/python2.6/site-packages/IPython/frontend/terminal/ipapp.py", line 340, in init_shell
    ipython_dir=self.ipython_dir)
  File "/usr/lib/python2.6/site-packages/IPython/config/configurable.py", line 318, in instance
    inst = cls(*args, **kwargs)
  File "/usr/lib/python2.6/site-packages/IPython/frontend/terminal/interactiveshell.py", line 360, in __init__
    user_module=user_module, custom_exceptions=custom_exceptions
  File "/usr/lib/python2.6/site-packages/IPython/core/interactiveshell.py", line 436, in __init__
    self.init_history()
  File "/usr/lib/python2.6/site-packages/IPython/core/interactiveshell.py", line 1489, in init_history
    self.history_manager = HistoryManager(shell=self, config=self.config)
  File "/usr/lib/python2.6/site-packages/IPython/core/history.py", line 409, in __init__
    self.new_session()
  File "<string>", line 2, in new_session
  File "/usr/lib/python2.6/site-packages/IPython/core/history.py", line 60, in needs_sqlite
    return f(*a,**kw)
  File "/usr/lib/python2.6/site-packages/IPython/core/history.py", line 427, in new_session
    NULL, "") """, (datetime.datetime.now(),))
OperationalError: database is locked

If you suspect this is an IPython bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@scipy.org

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    c.Application.verbose_crash=True