Internal error in regular expression engine

[roman]

Trac gives an "internal error in regular expression engine" on WikiStart page. the source of wikiStart page is attached.

Environment: packaged Trac 0.10.4 distribution, Windows Vista, Python24, MySQL 5.1, default DB encoding: UTF8

---

Python Traceback
Traceback (most recent call last):
  File "C:\Python24\Lib\site-packages\trac\web\main.py", line 406, in dispatch_request
    dispatcher.dispatch(req)
  File "C:\Python24\Lib\site-packages\trac\web\main.py", line 237, in dispatch
    resp = chosen_handler.process_request(req)
  File "build\bdist.win32\egg\tractags\web_ui.py", line 64, in process_request
  File "C:\Python24\Lib\site-packages\trac\wiki\web_ui.py", line 135, in process_request
    self._render_view(req, db, page)
  File "C:\Python24\Lib\site-packages\trac\wiki\web_ui.py", line 443, in _render_view
    req.hdf['wiki'] = {
  File "C:\Python24\Lib\site-packages\trac\wiki\formatter.py", line 1001, in wiki_to_html
    Formatter(env, req, absurls, db).format(wikitext, out, escape_newlines)
  File "C:\Python24\Lib\site-packages\trac\wiki\formatter.py", line 824, in format
    result = re.sub(self.wiki.rules, self.replace, line)
  File "C:\Python24\lib\sre.py", line 142, in sub
    return _compile(pattern, 0).sub(repl, string, count)
RuntimeError: internal error in regular expression engine

[roman]

source of erroneous page

[roman]

this is the project's config file

[roman]

Apache version: 2.2;

and seems like the same error occurs when I go to Timeline and View Tickets pages.

however, some wiki pages do not give this error; don't know why.

another thing is that if I remove all content from, for example, wikistart, then it stops displaying error. But even the simplest content, like string "hello world" makes it fail again.

[Christian Boos]

I see you're using lots of plugins. Disable them one by one until you find the culprit.

[roman]

actually I suspected that it was TracTags who made the bug; but it proved to be wrong.

here is what I've done: 1) last weeks I entered pretty lot of data into the wiki; it was working fine; 2) today I wanted to disable camelcase links for inexistent pages, modified trac.ini and restarted apache; I also played with splitting page names. 3) and disaster happened. returning values back did not help; reinstalling trac did not help;

Just a minute ago I completed restoring the project environment from backup. After I restored all disk files, everything started working OK.

I'll investigate if WikiCalendar could be the reason (I added it today).

[roman]

I also restored database content from backup, and it is still working OK. but some plugins are not present at this time (since this is a restored environment version); will look at them.

[Emmanuel Blot]

(Fixing title)

[roman]

Reproduced the bad situation again several minutes ago.

Seems like the problem is in HierWiki plugin. The stack trace is in attached text file; but you probably can not be responsible for this.

To fix, I just disabled "Enforce page hierarchy" and "RelativeWikiFormatter" modules of TracHierWiki plugin. After I disabled them and restarted Apache, wiki started working again.

I'll not post here anymore, though, since this problem does not seem to be of your scope.

[roman]

HierWiki fails, maybe because of too many pages in DB

[Emmanuel Blot]

Ok, thanks for the update.