Earlier today 5 exceptions were logged by CentralAuthHooks::attemptAddUser.

User::addToDatabase: hit a key conflict attempting to insert user 'Mkhz2' row, but it was not present in select!
#0 /usr/local/apache/common-local/php-1.24wmf6/extensions/CentralAuth/CentralAuthHooks.php(856): User->addToDatabase()
#1 /usr/local/apache/common-local/php-1.24wmf6/extensions/CentralAuth/CentralAuthHooks.php(581): CentralAuthHooks::attemptAddUser(Object(User))
#2 [internal function]: CentralAuthHooks::onUserLoadFromSession(Object(User), NULL)
#3 /usr/local/apache/common-local/php-1.24wmf6/includes/Hooks.php(206): call_user_func_array('CentralAuthHook...', Array)
#4 /usr/local/apache/common-local/php-1.24wmf6/includes/GlobalFunctions.php(4001): Hooks::run('UserLoadFromSes...', Array, NULL)
#5 /usr/local/apache/common-local/php-1.24wmf6/includes/User.php(1094): wfRunHooks('UserLoadFromSes...', Array)
#6 /usr/local/apache/common-local/php-1.24wmf6/includes/User.php(343): User->loadFromSession()
#7 /usr/local/apache/common-local/php-1.24wmf6/includes/User.php(1932): User->load()
#8 /usr/local/apache/common-local/php-1.24wmf6/includes/User.php(3058): User->getId()
#9 /usr/local/apache/common-local/php-1.24wmf6/includes/Wiki.php(541): User->isLoggedIn()
#10 /usr/local/apache/common-local/php-1.24wmf6/includes/Wiki.php(451): MediaWiki->main()
#11 /usr/local/apache/common-local/php-1.24wmf6/index.php(46): MediaWiki->run()
#12 /usr/local/apache/common-local/w/index.php(3): require('/usr/local/apac...')

2014-06-05T02:10:04.000Z
exception
fawiki
mw1092
User::addToDatabase: hit a key conflict attempting to insert user 'Mkhz2' row, but it was not present in select!

2014-06-05T02:10:04.000Z
exception-json
fawiki
mw1164
User::addToDatabase: hit a key conflict attempting to insert user 'Mkhz2' row, but it was not present in select!

2014-06-05T02:10:04.000Z
exception
fawiki
mw1112
User::addToDatabase: hit a key conflict attempting to insert user 'Mkhz2' row, but it was not present in select!

2014-06-05T02:10:04.000Z
exception
fawiki
mw1081
User::addToDatabase: hit a key conflict attempting to insert user 'Mkhz2' row, but it was not present in select!

2014-06-05T02:10:04.000Z
exception-json
fawiki
mw1085
User::addToDatabase: hit a key conflict attempting to insert user 'Mkhz2' row, but it was not present in select!

See also:

• bug 16020
• bug 41609

Version: unspecified
Severity: normal