Wikimedia Bugzilla is closed!

https://wikitech.wikimedia.org/w/index.php?title=Incident_documentation&oldid=89337 yields "Database error: A database query error has occurred. This may indicate a bug in the software."  The error log says: "PHP Notice: Uncommitted DB writes (transaction from DatabaseBase::query (WikiPage::pageData)). in /srv/org/wikimedia/controller/wikis/slot0/includes/db/Database.php on line 4104".

Bisecting shows that this started with the addition of "{{#ask: [[Category:Events reports]] | format=ul }}" to the page, but must have been worked in the past.

Playing around with some queries shows that #ask'ing for categories with only plain pages works (Category:Tools Access Requests), but for categories with subcategories (Category:Events reports, Category:Linode) fails.

Currently, wikitech is running 1.8.0.5.

"format=debug" says (not failing):

| Debug Output by SMWSQLStore3
| Generated Wiki-Query
| [[Category:Events reports]]
| Query Metrics
| Query-Size:1
| Query-Depth:0
| SQL Query
| SELECT DISTINCT t2.smw_title AS t,t2.smw_namespace AS ns FROM `smw_object_ids` AS t2 INNER JOIN `smw_fpt_inst` AS t0 ON t2.smw_id=t0.s_id INNER JOIN `t1` AS t1 ON t0.o_id=t1.id ORDER BY t2.smw_sortkey ASC LIMIT 51 OFFSET 0;
| Auxilliary Tables Used
| Temporary table t1
|   Recursively computed hierarchy for element(s) ('3544').
| Errors and Warnings
| None