if ($lock != 1) {
                    $this->_log(sprintf(
                        "Successfully broke lock for ID %s after %.5f seconds (%d attempts). Lock: %dnLast request of broken lock: %s",
                        $sessionId, (microtime(true) - $timeStart), $tries, $lock, $this->_redis->hGet($sessionId, 'req')
                    ), Zend_Log::INFO);

tail -f exception.log
#4 /home/magento/master/html/app/code/community/Aoe/Scheduler/Model/Schedule.php(196): call_user_func_array(Array, Array)
#5 /home/magento/master/html/app/code/community/Aoe/Scheduler/Model/Schedule.php(582): Aoe_Scheduler_Model_Schedule->runNow(true)
#6 /home/magento/master/html/app/code/community/Aoe/Scheduler/Model/Observer.php(39): Aoe_Scheduler_Model_Schedule->process()
#7 /home/magento/master/html/app/code/core/Mage/Core/Model/App.php(1358): Aoe_Scheduler_Model_Observer->dispatch(Object(Varien_Event_Observer))
#8 /home/magento/master/html/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App->_callObserverMethod(Object(Aoe_Scheduler_Model_Observer), 'dispatch', Object(Varien_Event_Observer))
#9 /home/magento/master/html/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('default', Array)
#10 /home/magento/master/html/shell/scheduler.php(377): Mage::dispatchEvent('default', Array)
#11 /home/magento/master/html/shell/scheduler.php(37): Aoe_Scheduler_Shell_Scheduler->cronAction()
#12 /home/magento/master/html/shell/scheduler.php(403): Aoe_Scheduler_Shell_Scheduler->run()
#13 {main}