https://bugzilla.wikimedia.org/show_bug.cgi?id=60417
Web browser: ---
Bug ID: 60417
Summary: Flow: "fetchSubtreeNodeList() on a non-object" errors
viewing history of some topics
Product: MediaWiki extensions
Version: master
Hardware: All
URL: https://en.wikipedia.beta.wmflabs.org/w/index.php?titl
e=Talk:Flow_QA&workflow=050ecd04b9bd5cb204fa02163e0fb6
8f&action=topic-history
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Flow
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Classification: Unclassified
Mobile Platform: ---
Bug 60349 reports database errors (duplicate entry for key
'flow_revision_unique_parent' in `flow_revision`) when browser tests edit topic
titles. I scrolled down in the Flow board
https://en.wikipedia.beta.wmflabs.org/wiki/Talk:Flow_QA to load the topic in
the screenshot that had a database error. When I click the timestamp in the
topic titlebar for either
Title edited0.8243609783129688
(probably the one before the title edit that failed)
Title edited0.42354122292114904
(probably the title whose edit failed), I get a 500 error. The error page has
PHP fatal error in
/data/project/apache/common-local/php-master/extensions/Flow/includes/Data/RevisionStorage.php
line 550:
Call to a member function fetchSubtreeNodeList() on a non-object
This may be coincidental, but I clicked a bunch of other timestamps in topic
titlebars and they show history fine. (The real proof would be to work out the
workflow IDs for the other 14 database errors in dberror.log in bug 60349 and
attempt to view the topic-history for each of them.) Clicking the mini-pencil
icon > Show change for these topics works fine, as does viewing board history.
The 500 URLs are
https://en.wikipedia.beta.wmflabs.org/w/index.php?title=Talk:Flow_QA&workflow=050ecd04b9bd5cb204fa02163e0fb68f&action=topic-history
and
https://en.wikipedia.beta.wmflabs.org/w/index.php?title=Talk:Flow_QA&workflow=050ecd00e76d5cb204fa02163e0fb68f&action=topic-history
fatal.log contains
#0
/data/project/apache/common-local/php-master/extensions/Flow/includes/Data/RevisionStorage.php(550):
Flow\Data\TopicHistoryIndex::backingStoreFindMulti()
#1
/data/project/apache/common-local/php-master/extensions/Flow/includes/Data/ObjectManager.php(1134):
Flow\Data\TopicHistoryIndex->backingStoreFindMulti(Array, Array, Array)
#2
/data/project/apache/common-local/php-master/extensions/Flow/includes/Data/ObjectManager.php(243):
Flow\Data\FeatureIndex->findMulti(Array)
#3
/data/project/apache/common-local/php-master/extensions/Flow/includes/Data/ObjectManager.php(217):
Flow\Data\ObjectLocator->findMulti(Array, Array)
#4 [internal function]: Flow\Data\ObjectLocator->find(Array, Array)
#5
/data/project/apache/common-local/php-master/extensions/Flow/includes/Data/ObjectManager.php(177):
call_user_func_array(Array, Array)
...
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