Last modified: 2014-10-07 14:03:36 UTC
If $wgCentralAuthAutoMigrate is set to true, when a user logs in and has no global account, in case all local accouns with same username match the email and/or password, create a global account and merge everything. It was noted on https://meta.wikimedia.org/?oldid=9740729#RenameUser_announcement that this case is fairly frequent and not handled by $wgCentralAuthAutoMigrate yet. Bug 69291 should have taken care of all the unmerged accounts sharing email. Example: https://tools.wmflabs.org/meta/stalktoy/Nemo+nonies , two local accounts with same password and no email set; I logged in for both and no global account was created.
Change 158578 had a related patch set uploaded by Legoktm: Auto-migrate matching accounts where no global account exists https://gerrit.wikimedia.org/r/158578
Change 158578 merged by jenkins-bot: Auto-migrate matching accounts where no global account exists https://gerrit.wikimedia.org/r/158578
Patch was reverted due to bug 71223.
And now fixed again. Thanks Lego, Ori, Reedy. * b01c59a2436e87ed4bb204a63ef2ab8bc74a4157 * 58c2fc8387f0a14d266ebd0e23eb874ce9c71f14 Should reach all Wikipedias with 1.25wmf1 on Thursday, 2 October 2014 (with https://gerrit.wikimedia.org/r/#/c/162971/ ).