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PHP Fatal Error from line 221 of /srv/mediawiki/php-1.41.0-wmf.29/includes/AutoLoader.php: require(): Failed opening required '/srv/mediawiki/php-1.41.0-wmf.29/includes/libs/rdbms/exception/DBConnectionError.php' (include_path=
Closed, ResolvedPublicPRODUCTION ERROR


[{reqId}] {exception_url}   PHP Fatal Error from line 221 of /srv/mediawiki/php-1.41.0-wmf.29/includes/AutoLoader.php: require(): Failed opening required '/srv/mediawiki/php-1.41.0-wmf.29/includes/libs/rdbms/exception/DBConnectionError.php' (include_path=
from /srv/mediawiki/php-1.41.0-wmf.29/includes/AutoLoader.php(221)
#0 [internal function]: MWExceptionHandler::handleFatalError()
#1 {main}

I can't tell about the impact, looks like some job fails with a database error. The big unknown is why DBConnectionError.php could not be opened?!

There are similar issues with Failed opening required '/srv/mediawiki/php-1.41.0-wmf.29/includes/libs/HttpStatus.php


Looking at the error log, the errors appears between 7:50 UTC and 9:50 UTC possibly due to a scheduled job? Here is the view over 7 days with the filter "/srv/mediawiki/php-1.41.0-wmf.29/includes/AutoLoader.php"

autoload_fatal_7days.png (273×628 px, 16 KB)


Request URL

Event Timeline

When looking at the log entries for the trace id used to generate this task ( Find in Logstash ), there are close to 20k messages from PageViewInfo Failed fetching {requesturl}: {error}.

We found an issue with PageViewInfo yesterday and filed it as T348517

But the devil is why the Autoloader.php can not find the requested files (either DbConnectionError.php or HttpStatus.php. Maybe that is because PHP is shutting down and the autoloader entries have already been deleted.

The similar report for HttpStatus.php not being found:

[{reqId}] {exception_url}   PHP Fatal Error from line 221 of /srv/mediawiki/php-1.41.0-wmf.29/includes/AutoLoader.php: require(): Failed opening required '/srv/mediawiki/php-1.41.0-wmf.29/includes/libs/HttpStatus.php' (include_path='/srv/mediawiki/php-1.4
from /srv/mediawiki/php-1.41.0-wmf.29/includes/AutoLoader.php(221)
#0 [internal function]: MWExceptionHandler::handleFatalError()
#1 {main}

That trace id also have a bunch of Class 'Cdb\Exception' not found which got filed as T341658. So that might be a duplicate.

Urbanecm_WMF claimed this task.
Urbanecm_WMF subscribed.

Based on the timing and the fact it's happening on the jobrunners, I'm fairly certain this is related to T344428#9279661 in some way. It also seems to no longer happen since the T344428#9279661 change was deployed, which also signalizes the root cause is the same.

In any case, since logstash says this doesn't happen since yesterday, I'm closing this one (and linking to T344428 for future reference).