https://bugzilla.wikimedia.org/show_bug.cgi?id=38577

       Web browser: ---
             Bug #: 38577
           Summary: old data returning from editing
           Product: MediaWiki
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: Unprioritized
         Component: Page editing
        AssignedTo: [email protected]
        ReportedBy: [email protected]
    Classification: Unclassified
   Mobile Platform: ---


This is something I noticed with [[User:COIBot]] on meta when it is maintaining
a log on [[User:COIBot/LinkReports]].  One can see it in this history:
http://meta.wikimedia.org/w/index.php?title=User:COIBot/LinkReports&offset=20120718115734&action=history
- there are edits by the bot that remove a huge chunk of data, and then later
there are edits that re-insert a huge chunk of data - the re-inserted data is
ALWAYS the same, also when it gets manually blanked.  Resetting the procedures
that do that or even restarting the bot (including: killing the bot, blanking
the page, starting the bot again) does not help, suggesting it is not a
memory-problem with the bot.

Today I noticed this - when you go to this diff
http://meta.wikimedia.org/w/index.php?title=User:COIBot/LinkReports&diff=3941288&oldid=3941163
(recent) - where I have both left and right only edits of July 2012 in the
logs, and I press 'undo', I get a conflict with intermediate edits (as
expected), and on approx 90% of the attempts an edit window which does NOT
contain the current content of the page, but old data.  Note that that old data
is ALWAYS the same, and is the same as that the bot gets when it reinstates the
huge chunk of data.

Note: I have made a bug-catch in the bot, so it retries and eventually blanks
when it gets the old data, but that is just a symptom patch, it still gets the
wrong page on a regular basis.

Other Note: User:COIBot/LinkReports has a massive number of revids, maybe that
is a hint to the source of the problem?

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