I have read the threads, searched google... to no avail. Stuck.

I have Django running with Apache2  on Debian Squeeze and mod_wsgi in a 
WSGIDaemonProcess with user=www-data, my user_media directory belongs to 
www-data and is 777, as is the cache directory inside it. And sometimes the 
sub-directories inside cache (like d1, f7...) are created by www-data and 
sometimes they are created by lrprod1 (which is the system user I use to 
host the code). I have no idea why, and it causes some permissions denied 
that I cannot workaround with some simple group changing since the 
directories are not even writable by group.
I did not install this system myself so I may be missing so basic config 
here. But yet I can't understand how the directories could be created by 
Django with another user than the one specified in wsgi. I can provide more 
info, right now I don't see what. How could I investigate that?

Here is an example traceback:

Traceback (most recent call last):

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/core/handlers/base.py",
 
line 111, in get_response
   response = callback(request, *callback_args, **callback_kwargs)

 File 
"/home/lrprod1/apps/project/apache/../src/project/application/project/generic/views.py",
 
line 23, in home
   context_instance=RequestContext(request))

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/shortcuts/__init__.py",
 
line 20, in render_to_response
   return HttpResponse(loader.render_to_string(*args, **kwargs), 
**httpresponse_kwargs)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/loader.py",
 
line 188, in render_to_string
   return t.render(context_instance)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 123, in render
   return self._render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 117, in _render
   return self.nodelist.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 744, in render
   bits.append(self.render_node(node, context))

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 757, in render_node
   return node.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/loader_tags.py",
 
line 127, in render
   return compiled_parent._render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 117, in _render
   return self.nodelist.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 744, in render
   bits.append(self.render_node(node, context))

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 757, in render_node
   return node.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/loader_tags.py",
 
line 64, in render
   result = block.nodelist.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 744, in render
   bits.append(self.render_node(node, context))

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 757, in render_node
   return node.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/defaulttags.py",
 
line 311, in render
   return self.nodelist_true.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 744, in render
   bits.append(self.render_node(node, context))

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 757, in render_node
   return node.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/defaulttags.py",
 
line 500, in render
   output = self.nodelist.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 744, in render
   bits.append(self.render_node(node, context))

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 757, in render_node
   return node.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/templatetags/cache.py",
 
line 31, in render
   value = self.nodelist.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 744, in render
   bits.append(self.render_node(node, context))

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 757, in render_node
   return node.render(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/defaulttags.py",
 
line 227, in render
   nodelist.append(node.render(context))

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/defaulttags.py",
 
line 184, in render
   values = self.sequence.resolve(context, True)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 510, in resolve
   obj = self.var.resolve(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 653, in resolve
   value = self._resolve_lookup(context)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/template/base.py",
 
line 698, in _resolve_lookup
   current = current()

 File 
"/home/lrprod1/apps/project/apache/../src/project/application/project/street/models.py",
 
line 265, in thumbnails_of_related_objects
   crop="center").url,

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/sorl/thumbnail/shortcuts.py",
 
line 8, in get_thumbnail
   return default.backend.get_thumbnail(file_, geometry_string, **options)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/sorl/thumbnail/base.py",
 
line 61, in get_thumbnail
   thumbnail)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/sorl/thumbnail/base.py",
 
line 87, in _create_thumbnail
   default.engine.write(image, options, thumbnail)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/sorl/thumbnail/engines/base.py",
 
line 74, in write
   thumbnail.write(raw_data)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/sorl/thumbnail/images.py",
 
line 127, in write
   return self.storage.save(self.name, content)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/core/files/storage.py",
 
line 49, in save
   name = self._save(name, content)

 File 
"/home/lrprod1/apps/virtual_environments/project/lib/python2.6/site-packages/django/core/files/storage.py",
 
line 187, in _save
   fd = os.open(full_path, os.O_WRONLY | os.O_CREAT | os.O_EXCL | 
getattr(os, 'O_BINARY', 0))

OSError: [Errno 13] Permission denied: 
'/home/lrprod1/lr_user_media/cache/75/00/75005dc960e794042cf8d5dca0463898.jpg'

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