RuntimeError: instance.__dict__ not accessible in restricted mode

[batchheizer]

How to Reproduce

While doing a GET operation on /attachment/ticket/143/, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'action': u'new',
 'attachfilebutton': u'Attach file',
 'path': u'143/',
 'realm': u'ticket'}

User Agent was: Mozilla/5.0 (OS/2; U; Warp 4.5; en-US; rv:1.8.1.16) Gecko/20080715 PmWFx/2.0.0.16

System Information

Trac	0.11
Python	2.5.2 (r252:60911, Jul 31 2008, 14:58:20) [GCC 3.4.6 [FreeBSD] 20060305]
setuptools	0.6c8
SQLite	3.3.7
pysqlite	2.3.5
Genshi	0.5.1
mod_python	3.3.1
Pygments	0.10
Subversion	1.5.1 (r32289)
jQuery:	1.2.3

Python Traceback

Traceback (most recent call last):
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/web/main.py", line 423, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/web/main.py", line 173, in dispatch
    chosen_handler)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/web/main.py", line 286, in _pre_process_request
    chosen_handler = filter_.pre_process_request(req, chosen_handler)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/versioncontrol/api.py", line 79, in pre_process_request
    self.get_repository(req.authname).sync()
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/versioncontrol/api.py", line 142, in get_repository
    repos = self._connector.get_repository(rtype, rdir, authname)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/versioncontrol/svn_fs.py", line 277, in get_repository
    'branches': self.branches})
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/versioncontrol/svn_fs.py", line 387, in __init__
    self.pool = Pool()
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11-py2.5.egg/trac/versioncontrol/svn_fs.py", line 151, in __init__
    self._pool = core.svn_pool_create(self._parent_pool())
  File "/usr/local/lib/python2.5/site-packages/svn/core.py", line 248, in svn_pool_create
    return Pool(parent_pool)
  File "/usr/local/lib/python2.5/site-packages/libsvn/core.py", line 1440, in svn_pool_create
    return apply(_core.svn_pool_create, args)
  File "/usr/local/lib/python2.5/site-packages/libsvn/core.py", line 5010, in _wrap
    obj.set_parent_pool(self)
  File "/usr/local/lib/python2.5/site-packages/libsvn/core.py", line 4923, in set_parent_pool
    self._parent_pool = parent_pool or application_pool
  File "/usr/local/lib/python2.5/site-packages/libsvn/core.py", line 4911, in <lambda>
    __setattr__ = lambda self, name, value: _swig_setattr(self, apr_pool_t, name, value)
  File "/usr/local/lib/python2.5/site-packages/libsvn/core.py", line 24, in _swig_setattr
    return _swig_setattr_nondynamic(self,class_type,name,value,0)
  File "/usr/local/lib/python2.5/site-packages/libsvn/core.py", line 19, in _swig_setattr_nondynamic
    self.__dict__[name] = value
RuntimeError: instance.__dict__ not accessible in restricted mode