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We're getting lots of lock timeout exceptions on moodle.org cron:

$ grep locktimeout moodle_cron.log | wc -l

It looks like its just the general '1 minute' lock -

 grep -A3 locktimeout moodle_cron.log

[2014-10-28 06:59:13.034470340+08:00] Error code: locktimeout

[2014-10-28 06:59:13.035358522+08:00] * line 476 of /lib/classes/task/manager.php: moodle_exception thrown

[2014-10-28 06:59:13.036230663+08:00] * line 66 of /lib/cronlib.php: call to coretaskmanager::get_next_scheduled_task()

[2014-10-28 06:59:13.037088407+08:00] * line 61 of /admin/cli/cron.php: call to cron_run()

--

[2014-10-28 07:02:13.052908571+08:00] Error code: locktimeout

[2014-10-28 07:02:13.053541452+08:00] * line 476 of /lib/classes/task/manager.php: moodle_exception thrown

[2014-10-28 07:02:13.054185565+08:00] * line 66 of /lib/cronlib.php: call to coretaskmanager::get_next_scheduled_task()

[2014-10-28 07:02:13.054889632+08:00] * line 61 of /admin/cli/cron.php: call to cron_run()

So perhaps this shouldn't be an exception?

has a non-specific relationship to

MDL-50719 Long-running scheduled task slows down all cron processing / task contention and re-proccessing bugs

MDL-50694 Cron message "The operation timed out while waiting for a lock" isn't really an error

has been marked as being related by

MDL-57852 Disable cron at site config level via gui and cli with fast shutdown

Participants:: Brendan Heywood, Colin Campbell, Dan Bennett, Dan Poltawski, David Binney, Jordi Pujol-Ahulló, Matt Porritt