Copied from T160565#4405170
2018-07-07 09:25:54 [W0CHIQpAIC8AAKPYmWEAAADY] mw1326 mediawikiwiki 1.32.0-wmf.10 exception ERROR: [W0CHIQpAIC8AAKPYmWEAAADY] /w/index.php?title=Special:LanguageStats&language=zh&uselang=en Exception from line 156 of /srv/mediawiki/php-1.32.0-wmf.10/includes/libs/objectcache/MemcachedBagOStuff.php: Key contains invalid characters: mediawikiwiki:SpecialLanguageStats%3A%3AmakeGroupRow:19-0-0-0--page-Extension%3AAzhàr_Authentication-en-zh {"exception_id":"W0CHIQpAIC8AAKPYmWEAAADY","exception_url":"/w/index.php?title=Special:LanguageStats&language=zh&uselang=en","caught_by":"mwe_handler"} [Exception Exception] (/srv/mediawiki/php-1.32.0-wmf.10/includes/libs/objectcache/MemcachedBagOStuff.php:156) Key contains invalid characters: mediawikiwiki:SpecialLanguageStats%3A%3AmakeGroupRow:19-0-0-0--page-Extension%3AAzhàr_Authentication-en-zh #0 /srv/mediawiki/php-1.32.0-wmf.10/includes/libs/objectcache/MemcachedPeclBagOStuff.php(154): MemcachedBagOStuff->validateKeyEncoding(string) #1 /srv/mediawiki/php-1.32.0-wmf.10/includes/libs/objectcache/MemcachedBagOStuff.php(56): MemcachedPeclBagOStuff->getWithToken(string, NULL, integer) #2 /srv/mediawiki/php-1.32.0-wmf.10/includes/libs/objectcache/BagOStuff.php(197): MemcachedBagOStuff->doGet(string, integer) #3 /srv/mediawiki/php-1.32.0-wmf.10/includes/libs/objectcache/ReplicatedBagOStuff.php(80): BagOStuff->get(string, integer) #4 /srv/mediawiki/php-1.32.0-wmf.10/includes/libs/objectcache/BagOStuff.php(197): ReplicatedBagOStuff->doGet(string, integer) #5 /srv/mediawiki/php-1.32.0-wmf.10/extensions/Translate/specials/SpecialLanguageStats.php(486): BagOStuff->get(string) #6 /srv/mediawiki/php-1.32.0-wmf.10/extensions/Translate/specials/SpecialLanguageStats.php(424): SpecialLanguageStats->makeGroupRow(WikiPageMessageGroup, array, AggregateMessageGroup) #7 /srv/mediawiki/php-1.32.0-wmf.10/extensions/Translate/specials/SpecialLanguageStats.php(434): SpecialLanguageStats->makeGroupGroup(WikiPageMessageGroup, array, AggregateMessageGroup) #8 /srv/mediawiki/php-1.32.0-wmf.10/extensions/Translate/specials/SpecialLanguageStats.php(381): SpecialLanguageStats->makeGroupGroup(array, array) #9 /srv/mediawiki/php-1.32.0-wmf.10/extensions/Translate/specials/SpecialLanguageStats.php(158): SpecialLanguageStats->getTable() #10 /srv/mediawiki/php-1.32.0-wmf.10/includes/specialpage/SpecialPage.php(565): SpecialLanguageStats->execute(NULL) #11 /srv/mediawiki/php-1.32.0-wmf.10/includes/specialpage/SpecialPageFactory.php(569): SpecialPage->run(NULL) #12 /srv/mediawiki/php-1.32.0-wmf.10/includes/MediaWiki.php(288): SpecialPageFactory::executePath(Title, RequestContext) #13 /srv/mediawiki/php-1.32.0-wmf.10/includes/MediaWiki.php(867): MediaWiki->performRequest() #14 /srv/mediawiki/php-1.32.0-wmf.10/includes/MediaWiki.php(524): MediaWiki->main() #15 /srv/mediawiki/php-1.32.0-wmf.10/index.php(42): MediaWiki->run() #16 /srv/mediawiki/w/index.php(3): include(string) #17 {main}
This applies to ALL valid language codes, which shouldn't happen.