https://bugzilla.wikimedia.org/show_bug.cgi?id=60618

       Web browser: ---
            Bug ID: 60618
           Summary: Database error when using Special:WhatLinksHere on
                    Commons
           Product: MediaWiki
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Database
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: jaroslaw.w.tuszyn...@leidos.com
    Classification: Unclassified
   Mobile Platform: ---

Special:WhatLinksHere on Commons occasionally gives Database errors. For
example:

https://commons.wikimedia.org/w/index.php?title=Special%3AWhatLinksHere&target=Template%3ALocation%2Flayout&namespace=10
 

and 

https://commons.wikimedia.org/w/index.php?title=Special%3AWhatLinksHere&target=Module%3AFallbacklist&namespace=828
 

gave me:

  Database error
  A database query error has occurred. This may indicate a bug in the software.
    Function: SpecialWhatLinksHere::showIndirectLinks
    Error: 0 

Antoine "hashar" Musso checked on that and wrote:
"The first URL worked for me, the second throws a database error.

Thu Jan 30 14:11:19 UTC 2014 /* query */ Thu Jan 30 14:19:33 UTC 2014 /* query
*/ Connection lost and reconnected after 59.754s".

This might be related to the fact that both pages within last month or two went
through changes that affects update links tables on millions of pages, and
those link tables are slow to update, resulting in a state when results of
Special:WhatLinksHere do not match the actual linking dependencies.

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