OperationalError: database is locked

[muthue]

How to Reproduce

While doing a GET operation on /, Trac issued an internal error.

(please provide additional details here)

System Information

Trac	0.11.5
Python	2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)]
setuptools	0.6c9
SQLite	3.5.9
pysqlite	2.4.1
Genshi	0.6
mod_wsgi	3.3
Pygments	1.3.1
Subversion	1.6.13 (r1002816)
RPC	1.0.5
CustomFieldAdmin	0.2.2

Python Traceback

Traceback (most recent call last):
  File "C:\Program Files (x86)\Grey Sparling Version Control\python\lib\site-packages\trac-0.11.5-py2.6.egg\trac\web\main.py", line 444, in _dispatch_request
    dispatcher.dispatch(req)
  File "C:\Program Files (x86)\Grey Sparling Version Control\python\lib\site-packages\trac-0.11.5-py2.6.egg\trac\web\main.py", line 228, in dispatch
    req.session.save()
  File "C:\Program Files (x86)\Grey Sparling Version Control\python\lib\site-packages\trac-0.11.5-py2.6.egg\trac\web\session.py", line 97, in save
    (self.sid,))
  File "C:\Program Files (x86)\Grey Sparling Version Control\python\lib\site-packages\trac-0.11.5-py2.6.egg\trac\db\util.py", line 59, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "C:\Program Files (x86)\Grey Sparling Version Control\python\lib\site-packages\trac-0.11.5-py2.6.egg\trac\db\sqlite_backend.py", line 58, in execute
    args or [])
  File "C:\Program Files (x86)\Grey Sparling Version Control\python\lib\site-packages\trac-0.11.5-py2.6.egg\trac\db\sqlite_backend.py", line 50, in _rollback_on_error
    return function(self, *args, **kwargs)
OperationalError: database is locked

[Jun Omae]

Duplicate of #3446, one of our MostFrequentDuplicates.