Spotted in production on commonswiki. Only happening to a couple of URLs:
{F9380293 alt="Screenshotted because I was too lazy to copy+paste all these weird urls"}
```
#0 /srv/mediawiki/php-1.30.0-wmf.16/includes/specialpage/RedirectSpecialPage.php(55): RedirectSpecialPage->showNoRedirectPage()
#1 /srv/mediawiki/php-1.30.0-wmf.16/includes/specialpage/SpecialPage.php(522): RedirectSpecialPage->execute(NULL)
#2 /srv/mediawiki/php-1.30.0-wmf.16/includes/specialpage/SpecialPageFactory.php(578): SpecialPage->run(NULL)
#3 /srv/mediawiki/php-1.30.0-wmf.16/includes/MediaWiki.php(287): SpecialPageFactory::executePath(Title, RequestContext)
#4 /srv/mediawiki/php-1.30.0-wmf.16/includes/MediaWiki.php(848): MediaWiki->performRequest()
#5 /srv/mediawiki/php-1.30.0-wmf.16/includes/MediaWiki.php(523): MediaWiki->main()
#6 /srv/mediawiki/php-1.30.0-wmf.16/index.php(43): MediaWiki->run()
#7 /srv/mediawiki/w/index.php(3): include(string)
#8 {main}
```