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CentralAuthUser::register(): Duplicate entry for key 'gu_name'
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Same as T106850, but with private info redacted:

Query: INSERT  INTO `globaluser` (gu_name,gu_email,gu_email_authenticated,gu_salt,gu_password,gu_locked,gu_hidden,gu_registration) VALUES ('{username}','{email}',NULL,'','REDACTED','0','','...')
Function: CentralAuthUser::register
Error: 1062 Duplicate entry '...' for key 'gu_name' (

Seeing some duplicate key issues from multiple extensions (see T106849 for example). Not sure if they're all caused by the same underlying issue.

In T106850#1479986, @Anomie wrote:

It looks like the most likely situation here is a double-submission, where both submissions made it through the 'AbortNewAccount' hook before either one got as far as the call to $wgAuth->addUser().

Checking the logs, CentralAuth.log records the account was created at 09:25:39 on mw1254, while the exception you quoted is logged at the same timestamp on mw1099.

Event Timeline

Legoktm raised the priority of this task from to Needs Triage.
Legoktm updated the task description. (Show Details)
Legoktm added subscribers: Legoktm, ori, Anomie.

Change 230470 had a related patch set uploaded (by Legoktm):
Avoid duplicate key errors in CentralAuthUser::register()

Change 230470 merged by jenkins-bot:
Avoid duplicate key errors in CentralAuthUser::register()