RuntimeError: instance.__dict__ not accessible in restricted mode

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How to Reproduce

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

(please provide additional details here)

User Agent was: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_2; en-US) AppleWebKit/533.2 (KHTML, like Gecko) Chrome/5.0.342.3 Safari/533.2

System Information

Trac	0.11.1
Python	2.5.2 (r252:60911, Jan 20 2010, 22:05:59) [GCC 4.2.4 (Ubuntu 4.2.4-1ubuntu3)]
setuptools	0.6c8
SQLite	3.4.2
pysqlite	2.4.0
Genshi	0.5.1
Pygments	0.9
Subversion	1.4.6 (r28521)
jQuery:	1.2.6

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/trac/web/main.py", line 423, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.5/site-packages/trac/web/main.py", line 173, in dispatch
    chosen_handler)
  File "/usr/lib/python2.5/site-packages/trac/web/main.py", line 286, in _pre_process_request
    chosen_handler = filter_.pre_process_request(req, chosen_handler)
  File "/usr/lib/python2.5/site-packages/trac/versioncontrol/api.py", line 86, in pre_process_request
    self.get_repository(req.authname).sync()
  File "/usr/lib/python2.5/site-packages/trac/versioncontrol/api.py", line 157, in get_repository
    repos = self._connector.get_repository(rtype, rdir, authname)
  File "/usr/lib/python2.5/site-packages/trac/versioncontrol/svn_fs.py", line 280, in get_repository
    'branches': self.branches})
  File "/usr/lib/python2.5/site-packages/trac/versioncontrol/svn_fs.py", line 390, in __init__
    self.pool = Pool()
  File "/usr/lib/python2.5/site-packages/trac/versioncontrol/svn_fs.py", line 151, in __init__
    self._pool = core.svn_pool_create(self._parent_pool())
  File "/var/lib/python-support/python2.5/svn/core.py", line 177, in svn_pool_create
    return Pool(parent_pool)
  File "/var/lib/python-support/python2.5/libsvn/core.py", line 1082, in svn_pool_create
    return apply(_core.svn_pool_create, args)
  File "/var/lib/python-support/python2.5/libsvn/core.py", line 3105, in _wrap
    obj.set_parent_pool(self)
  File "/var/lib/python-support/python2.5/libsvn/core.py", line 2996, in set_parent_pool
    self._parent_pool = parent_pool or application_pool
  File "/var/lib/python-support/python2.5/libsvn/core.py", line 2984, in <lambda>
    __setattr__ = lambda self, name, value: _swig_setattr(self, apr_pool_t, name, value)
  File "/var/lib/python-support/python2.5/libsvn/core.py", line 24, in _swig_setattr
    return _swig_setattr_nondynamic(self,class_type,name,value,0)
  File "/var/lib/python-support/python2.5/libsvn/core.py", line 19, in _swig_setattr_nondynamic
    self.__dict__[name] = value
RuntimeError: instance.__dict__ not accessible in restricted mode

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