Happened when simply viewing Special:NewPagesFeed. No entries show up at all. Tested while logged in and logged out.
A similar error also occurs at https://en.wikipedia.org/w/api.php?action=pagetriagestats&format=json&namespace=0&showunreviewed=1&showdeleted=1&showothers=1&show_predicted_issues_copyvio=1&non_autoconfirmed_users=1
Error
- mwversion: 1.42.0-wmf.12
- reqId: 6af294ab-e92f-450f-9bb5-a7ea9e55adcf
- Find reqId in Logstash
[{reqId}] {exception_url} Wikimedia\Rdbms\DBTransactionStateError: Cannot execute query from MediaWiki\User\UserGroupManager::getUserGroupMemberships while transaction status is ERRORfrom /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/TransactionManager.php(207)
#0 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/Database.php(989): Wikimedia\Rdbms\TransactionManager->assertTransactionStatus(Wikimedia\Rdbms\DatabaseMySQL, array, string)
#1 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/Database.php(637): Wikimedia\Rdbms\Database->assertQueryIsCurrentlyAllowed(string, string)
#2 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/Database.php(1347): Wikimedia\Rdbms\Database->query(Wikimedia\Rdbms\Query, string)
#3 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/DBConnRef.php(119): Wikimedia\Rdbms\Database->select(array, array, array, string, array, array)
#4 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/DBConnRef.php(351): Wikimedia\Rdbms\DBConnRef->__call(string, array)
#5 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/querybuilder/SelectQueryBuilder.php(708): Wikimedia\Rdbms\DBConnRef->select(array, array, array, string, array, array)
#6 /srv/mediawiki/php-1.42.0-wmf.12/includes/user/UserGroupManager.php(767): Wikimedia\Rdbms\SelectQueryBuilder->fetchResultSet()
#7 /srv/mediawiki/php-1.42.0-wmf.12/includes/user/UserGroupManager.php(733): MediaWiki\User\UserGroupManager->getUserGroupMemberships(MediaWiki\User\User, integer)
#8 /srv/mediawiki/php-1.42.0-wmf.12/includes/user/UserGroupManager.php(321): MediaWiki\User\UserGroupManager->getUserGroups(MediaWiki\User\User, integer)
#9 /srv/mediawiki/php-1.42.0-wmf.12/includes/Permissions/PermissionManager.php(1586): MediaWiki\User\UserGroupManager->getUserEffectiveGroups(MediaWiki\User\User)
#10 /srv/mediawiki/php-1.42.0-wmf.12/includes/Permissions/PermissionManager.php(1537): MediaWiki\Permissions\PermissionManager->getUserPermissions(MediaWiki\User\User)
#11 /srv/mediawiki/php-1.42.0-wmf.12/extensions/FlaggedRevs/includes/backend/FlaggedRevsHooks.php(1289): MediaWiki\Permissions\PermissionManager->userHasRight(MediaWiki\User\User, string)
#12 /srv/mediawiki/php-1.42.0-wmf.12/includes/HookContainer/HookContainer.php(161): FlaggedRevsHooks->onUserLoadAfterLoadFromSession(MediaWiki\User\User)
#13 /srv/mediawiki/php-1.42.0-wmf.12/includes/HookContainer/HookRunner.php(4298): MediaWiki\HookContainer\HookContainer->run(string, array)
#14 /srv/mediawiki/php-1.42.0-wmf.12/includes/user/User.php(432): MediaWiki\HookContainer\HookRunner->onUserLoadAfterLoadFromSession(MediaWiki\User\User)
#15 /srv/mediawiki/php-1.42.0-wmf.12/includes/user/User.php(1613): MediaWiki\User\User->load()
#16 /srv/mediawiki/php-1.42.0-wmf.12/includes/api/ApiMain.php(1975): MediaWiki\User\User->getName()
#17 /srv/mediawiki/php-1.42.0-wmf.12/includes/api/ApiMain.php(916): ApiMain->logRequest(double, Wikimedia\Rdbms\DBQueryError)
#18 /srv/mediawiki/php-1.42.0-wmf.12/includes/api/ApiMain.php(879): ApiMain->executeActionWithErrorHandling()
#19 /srv/mediawiki/php-1.42.0-wmf.12/api.php(95): ApiMain->execute()
#20 /srv/mediawiki/php-1.42.0-wmf.12/api.php(48): wfApiMain()
#21 /srv/mediawiki/w/api.php(3): require(string)
#22 {main}from /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/Database.php(1200)
#0 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/Database.php(898): Wikimedia\Rdbms\Database->getQueryException(string, integer, string, string)
#1 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/Database.php(829): Wikimedia\Rdbms\Database->handleErroredQuery(Wikimedia\Rdbms\QueryStatus, Wikimedia\Rdbms\Query, string, double, Wikimedia\Rdbms\CriticalSessionInfo)
#2 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/Database.php(713): Wikimedia\Rdbms\Database->attemptQuery(Wikimedia\Rdbms\Query, string, boolean)
#3 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/Database.php(640): Wikimedia\Rdbms\Database->executeQuery(Wikimedia\Rdbms\Query, string, integer)
#4 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/Database.php(1347): Wikimedia\Rdbms\Database->query(Wikimedia\Rdbms\Query, string)
#5 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/DBConnRef.php(119): Wikimedia\Rdbms\Database->select(array, string, array, string, array, array)
#6 /srv/mediawiki/php-1.42.0-wmf.12/includes/libs/rdbms/database/DBConnRef.php(351): Wikimedia\Rdbms\DBConnRef->__call(string, array)
#7 /srv/mediawiki/php-1.42.0-wmf.12/extensions/PageTriage/includes/Api/ApiPageTriageList.php(508): Wikimedia\Rdbms\DBConnRef->select(array, string, array, string, array, array)
#8 /srv/mediawiki/php-1.42.0-wmf.12/extensions/PageTriage/includes/Api/ApiPageTriageList.php(74): MediaWiki\Extension\PageTriage\Api\ApiPageTriageList::getPageIds(array)
#9 /srv/mediawiki/php-1.42.0-wmf.12/includes/api/ApiMain.php(1931): MediaWiki\Extension\PageTriage\Api\ApiPageTriageList->execute()
#10 /srv/mediawiki/php-1.42.0-wmf.12/includes/api/ApiMain.php(908): ApiMain->executeAction()
#11 /srv/mediawiki/php-1.42.0-wmf.12/includes/api/ApiMain.php(879): ApiMain->executeActionWithErrorHandling()
#12 /srv/mediawiki/php-1.42.0-wmf.12/api.php(95): ApiMain->execute()
#13 /srv/mediawiki/php-1.42.0-wmf.12/api.php(48): wfApiMain()
#14 /srv/mediawiki/w/api.php(3): require(string)
#15 {main}