Notice: Array to string conversion in /var/www/wiki/mediawiki/extensions/ShortUrl/ShortUrl.utils.php on line 81
Call Stack
# Time Memory Function Location
1 0.0001 362280 {main}( ) .../index.php:0
2 0.1515 3268560 MediaWiki->run( ) .../index.php:43
3 0.1521 3268816 MediaWiki->main( ) .../MediaWiki.php:522
4 0.3485 4873968 MediaWiki->{closure:/var/www/wiki/mediawiki/core/includes/MediaWiki.php:866-872}( ) .../MediaWiki.php:880
5 0.3485 4873968 OutputPage->output( ) .../MediaWiki.php:868
6 0.3584 4922088 SkinTemplate->outputPage( ) .../OutputPage.php:2345
7 0.7238 5775472 VectorTemplate->execute( ) .../SkinTemplate.php:252
8 1.0467 5851136 VectorTemplate->renderPortals( ) .../VectorTemplate.php:195
9 1.0628 5855296 VectorTemplate->renderPortal( ) .../VectorTemplate.php:273
10 1.0771 5856696 Hooks::run( ) .../VectorTemplate.php:319
11 1.0771 5857472 ShortUrlHooks::addToolboxLink( ) .../Hooks.php:195
12 1.0779 5857552 ShortUrlUtils::encodeTitle( ) .../ShortUrl.hooks.php:48
13 1.0785 5858176 base_convert ( ) .../ShortUrl.utils.php:81Description
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Code as of Nov 2016: https://github.com/wikimedia/mediawiki-extensions-ShortUrl/blob/3c6015c5ffb461234f2e801f369980fd896ed28c/ShortUrl.utils.php#L81.
Not sure how it can be an array, short of Memcached being poisoned by another code path, or one of Database::selectField or Database::insertId returning an array.
Not seen in WMF Logstash for at least 30 days. Shall we close this?
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Looks like that was on my dev wiki, but obviously quite a while ago. Let me test it on my dev wiki tonight and see if I can still reproduce it anywhere
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Thought: It wouldn't surprise me if it's related to the memcached interface changes in PHP7 (ala T196125: php-memcached 3.0 (PHP 7) incompatible with BagOStuff)