Cron schedule bug

[adrok]

Steps to reproduce

1. Install Magento from develop branch.
2. run bin/magento cron:run

Expected result

1. With default configuration, generated 4 jobs for "newsletter_send_all" (every 5 minutes, ahead 20 minutes)

Actual result

1. Generated one job

---

magento2/app/code/Magento/Cron/Observer/ProcessCronQueueObserver.php wrong return statement (for cycle)

if ($schedule->trySchedule()) {
                // time matches cron expression
                $schedule->save();
                return; //remove it!
            }

[mazhalai]

@adrok thank you for reporting, we have MAGETWO-51939 to investigate and fix.

[kanduvisla]

Could this also be related with an issue I am having at the moment? I'm trying to schedule multiple jobs in one group, with the same instance, but different methods:

<job name="sync_inventory_5m" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_5m">
    <schedule>*/5 * * * *</schedule>
</job>
<job name="sync_inventory_10m" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_10m">
    <schedule>*/10 * * * *</schedule>
</job>
<job name="sync_inventory_15m" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_15m">
    <schedule>*/15 * * * *</schedule>
</job>
<job name="sync_inventory_30m" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_30m">
    <schedule>*/30 * * * *</schedule>
</job>
<job name="sync_inventory_1h" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_1h">
    <schedule>0 * * * *</schedule>
</job>
<job name="sync_inventory_2h" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_2h">
    <schedule>0 */2 * * *</schedule>
</job>
<job name="sync_inventory_3h" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_3h">
    <schedule>0 */3 * * *</schedule>
</job>
<job name="sync_inventory_6h" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_6h">
    <schedule>0 */6 * * *</schedule>
</job>
<job name="sync_inventory_12h" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_12h">
    <schedule>0 */12 * * *</schedule>
</job>
<job name="sync_inventory_24h" instance="Vendor\Module\Cron\SynchronizeInventory" method="execute_24h">
    <schedule>0 0 * * *</schedule>
</job>

The result in the database table are crons for 5m, 10m and 15m and sometimes 30m. Could it be that Magento 2 thinks these are duplicate crons and thinks 'hey 5 minutes also fits in 10 and 15, so I don't need te re-schedule it'. Fact is that I do need to run those different methods on different intervals

[kanduvisla]

Perhaps related to this bug: tested in M2.1.1: when I add a cronjob that needs to be executed every 5 minutes, it's executed every 20 minutes or so.