p.a.discussion and infinite recursion after deleting a comment

Background: I have here an Plone 4.3 site which we upgraded from 4.2 
(which was upgraded some time ago from 4.1 and 4.0).

It happens if I delete an old comments, where there are more than one 
comments at the content.

Deleting the whole content breaks similar!

Theres a strange infinite recursion problem. I nailed it down to the 
indexer "total_comments" which call total_comments on Conversation.

https://github.com/plone/plone.app.discussion/blob/master/plone/app/discussion/conversation.py#L91

user_nobody.has_permission('View', x) runs in an infinite loop.

Debugging deeper I found the "x" - which is an Comment object - 
aqcuisition path is kind of broken.

See the pastebin http://pastebin.com/CdSPzaZP for details.

But if I use "instance debug", go to the content item and call 
absolute_url on it everythings fine:

 >>> content = 
app.Plone['eca-sekretariat'].termine.beratertage['millstatt-2013']['programm-eca-beratertag-millstatt-2013']

 >>> content.absolute_url()
'http://nohost/Plone/eca-sekretariat/termine/beratertage/millstatt-2013/programm-eca-beratertag-millstatt-2013'

 >>> content.__parent__
<ATFolder at /Plone/eca-sekretariat/termine/beratertage/millstatt-2013>

 >>> content.__parent__.__parent__
<ATFolder at /Plone/eca-sekretariat/termine/beratertage>

 >>> content.__parent__.__parent__.__parent__
<ATFolder at /Plone/eca-sekretariat/termine>

 >>> content.__parent__.__parent__.__parent__.__parent__
<ATFolder at /Plone/eca-sekretariat>

So any idea at which point the acquisition chain was modifed in this 
broken way?

Jens
-- 
Klein & Partner KG, member of BlueDynamics Alliance


------------------------------------------------------------------------------
Introducing Performance Central, a new site from SourceForge and 
AppDynamics. Performance Central is your source for news, insights, 
analysis and resources for efficient Application Performance Management. 
Visit us today!
http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk