[wp-trac] [WordPress Trac] #51716: WP Cron - looses entries

[WordPress Trac]

#51716: WP Cron - looses entries
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 Reporter:  Nate1         |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Cron API      |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:  performance
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Comment (by kkmuffme):

 This isn't only an issue due to it being stored as a single object, but
 also bc of object caching (even if non-persistent).
 If plugin A calls `wp_schedule_event` (or any function that loads the cron
 tasks via _get_cron_array()) on e.g. plugins_loaded, and plugin B calls
 `wp_schedule_event` later (e.g. shutdown), the option value retrieved
 initially is modified. If any other requests modified/scheduled crons in
 the meantime, all their scheduled crons are lost - or vice versa if cron
 is running at the same time but finishes before we call wp_schedule_event
 the 2nd time, it could mean that suddenly old crons that are already
 completed will be added back and run a 2nd time.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51716#comment:8>
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