These errors seem to come in pairs and recur quite often in the fatalmonitor/apache2 logs:
PHP Warning: Invalid argument supplied for foreach() in /usr/local/apache/common-local/php-1.23wmf10/includes/filebackend/SwiftFileBackend.php on line 180
PHP Warning: Invalid argument supplied for foreach() in /usr/local/apache/common-local/php-1.23wmf10/includes/filebackend/SwiftFileBackend.php on line 648
$ fgrep "SwiftFileBackend.php on line 180" /a/mw-log/apache2.log |wc -l 927 $ fgrep "SwiftFileBackend.php on line 648" /a/mw-log/apache2.log |wc -l 927
Version: 1.23.0
Severity: normal