Intermittent problem

[trac@…]

I realise this is one of those problems that is close to impossible to diagnose, but maybe the Python traceback is more helpful than I can be.

Lately, every once in a while I get an error trying to access Trac on our Xubuntu server. The traceback is below. After refreshing the page once or twice, it usually returns.

Sometimes when I am editting a page and submit, I don't get an error, but merely a blank page.

I have since upgraded Trac from 0.10dev to 0.10.3rc1, but to no avail. This server has worked well for a long time and it servers only a an svn, Trac and file server. No new software gets installed, except for the occasional Xubuntu update to already installed software.

Hope this helps somehow.

Python Traceback

Traceback (most recent call last):

File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 387, in dispatch_request

dispatcher.dispatch(req)

File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 191, in dispatch

chosen_handler = self._pre_process_request(req, chosen_handler)

File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 263, in _pre_process_request

chosen_handler = f.pre_process_request(req, chosen_handler)

File "/usr/lib/python2.4/site-packages/trac/versioncontrol/api.py", line 73, in pre_process_request

self.get_repository(req.authname) # triggers a sync if applicable

File "/usr/lib/python2.4/site-packages/trac/versioncontrol/api.py", line 101, in get_repository

repos = self._connector.get_repository(rtype, rdir, authname)

File "/usr/lib/python2.4/site-packages/trac/versioncontrol/svn_fs.py", line 259, in get_repository

repos = SubversionRepository(dir, None, self.log)

File "/usr/lib/python2.4/site-packages/trac/versioncontrol/svn_fs.py", line 287, in init

self.path = repos.svn_repos_find_root_path(path, self.pool())

File "/usr/lib/python2.4/site-packages/libsvn/repos.py", line 43, in svn_repos_find_root_path

return apply(_repos.svn_repos_find_root_path, args)

TypeError: argument number 2: a 'apr_pool_t *' is expected, 'instance(<libsvn.core.GenericSWIGWrapper instance at 0xb559db0c>)' is received

[Matthew Good]

This is a duplicate of #2611 and is a problem with using the SVN libraries with mod_python in multiple virtual hosts.

In your Apache config add:

    PythonInterpreter main_interpreter

after:

SetHandler    mod_python

This will force mod_python to run in the same interpreter and should avoid the issue described in #2611.