https://bugzilla.wikimedia.org/show_bug.cgi?id=36116
Web browser: ---
Bug #: 36116
Summary: Deadlock on user account creation leaves account in
bad state
Product: MediaWiki
Version: 1.19
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: User login
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Mobile Platform: ---
When creating the user account "17iwang" on the English Wikipedia on behalf of
a student, I received this error message:
Last attempted database query: (SQL query hidden)
Function: User::saveOptions
MySQL error: 1213: Deadlock found when trying to get lock; try restarting
transaction (10.0.6.48)
I tried to repeat the create operation, but was told:
"The requested username is already taken in the unified login system. Please
choose a different name."
I visited the user's user page, but it stated:
"User account "17iwang" is not registered."
Eventually I worked around this issue by logging in to the English Wikipedia as
the student, using the password I supplied during the initial create attempt
(the one that produced the deadlock).
It appears to be rare and based on concurrent transactions - I've never seen it
before or since, despite creating many accounts.
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