https://bugzilla.wikimedia.org/show_bug.cgi?id=31576

Roan Kattouw <roan.katt...@gmail.com> changed:

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--- Comment #11 from Roan Kattouw <roan.katt...@gmail.com> 2011-11-23 18:37:01 
UTC ---
I've investigated some of the occurrences, and discovered the following:
* this bug is related to bug 31577: all the wrongly-categorized pages there
also had PAGENAME, NAMESPACE, etc. in the template list
* the current parse results (from the parser cache) actually DON'T list the bad
templates, but the templatelinks table does. Purging the page doesn't remove
them, but null editing the page does

I've put in a live hack for debugging in r104059 that does the following
things:
* add the server name to the parser cache comment, so we can see which server
rendered the cached HTML. This is probably generally useful for debugging and
I'll probably put it in MediaWiki as an optional feature later
* before saving a parse result to the parser cache, check the templates list
for PAGENAME, FULLPAGENAME and NAMESPACE. If any of those three are in the
templates list, write the details (page name, pcache key, timestamp, server
name) to a log file

Hopefully this'll allow me to narrow down this issue. What I'm particularly
interested in, meanwhile, is NEW occurrences of this bug, because I want to
determine whether these bad template/category entries are still being created.
If they aren't, we can just clean up the old ones and be done with it, but if
they are, we have a real bug to fix.

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