Oops...
If you think this really should work and you can reproduce it. Then you should consider to report this problem to the Trac team.
Go to http://trac.edgewall.com/ and create a new ticket where you describe the problem, how to reproduce it. Don't forget to include the python traceback found below.
TracGuide — The Trac User and Administration Guide
Python traceback
Traceback (most recent call last): File "/usr/lib/python2.4/site-packages/trac/web/modpython_frontend.py", line 206, in handler dispatch_request(mpr.path_info, mpr, env) File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 139, in dispatch_request dispatcher.dispatch(req) File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 107, in dispatch resp = chosen_handler.process_request(req) File "/usr/lib/python2.4/site-packages/trac/versioncontrol/web_ui/changeset.py", line 86, in process_request self._render_html(req, repos, chgset, diff_options) File "/usr/lib/python2.4/site-packages/trac/versioncontrol/web_ui/changeset.py", line 158, in _render_html escape_newlines=True) File "/usr/lib/python2.4/site-packages/trac/wiki/formatter.py", line 747, in wiki_to_html Formatter(env, req, absurls, db).format(wikitext, out, escape_newlines) File "/usr/lib/python2.4/site-packages/trac/wiki/formatter.py", line 599, in format result = re.sub(self.rules, self.replace, line) File "/usr/lib/python2.4/sre.py", line 142, in sub return _compile(pattern, 0).sub(repl, string, count) File "/usr/lib/python2.4/site-packages/trac/wiki/formatter.py", line 219, in replace return wiki.external_handlers[itype](self, match, fullmatch) File "/usr/lib/python2.4/site-packages/trac/wiki/api.py", line 192, in <lambda> ignore_missing)) File "/usr/lib/python2.4/site-packages/trac/wiki/api.py", line 208, in _format_link if not self.has_page(page): File "/usr/lib/python2.4/site-packages/trac/wiki/api.py", line 121, in has_page self._update_index() File "/usr/lib/python2.4/site-packages/trac/wiki/api.py", line 95, in _update_index self.log.debug('Updating wiki page index') File "/usr/lib/python2.4/logging/__init__.py", line 918, in debug apply(self._log, (DEBUG, msg, args), kwargs) File "/usr/lib/python2.4/logging/__init__.py", line 1039, in _log self.handle(record) File "/usr/lib/python2.4/logging/__init__.py", line 1049, in handle self.callHandlers(record) File "/usr/lib/python2.4/logging/__init__.py", line 1082, in callHandlers hdlr.handle(record) File "/usr/lib/python2.4/logging/__init__.py", line 617, in handle self.emit(record) File "/usr/lib/python2.4/logging/__init__.py", line 717, in emit self.handleError(record) File "/usr/lib/python2.4/logging/__init__.py", line 668, in handleError traceback.print_exception(ei[0], ei[1], ei[2], None, sys.stderr) File "/usr/lib/python2.4/traceback.py", line 124, in print_exception _print(file, 'Traceback (most recent call last):') File "/usr/lib/python2.4/traceback.py", line 13, in _print file.write(str+terminator) IOError: [Errno 28] No space left on device