The wikitech sync on wikitech-static is spamming syslog with a ton of identical warnings, not sure of the impact on the sync itself.
The error is:
PHP Warning: call_user_func() expects parameter 1 to be a valid callback, cannot access private method ImageBuilde r::checkMissingImage() in /srv/mediawiki/w/includes/filerepo/FileRepo.php on line 1710
And this is a summary of its frequency:
# zgrep -c 'expects parameter 1 to be a valid callback' /var/log/syslog* /var/log/syslog:0 /var/log/syslog.1:7395 /var/log/syslog.2.gz:8359 /var/log/syslog.3.gz:8881 /var/log/syslog.4.gz:8938 /var/log/syslog.5.gz:8938 /var/log/syslog.6.gz:8938 /var/log/syslog.7.gz:8437