[wp-trac] [WordPress Trac] #57271: Cron unschedule / reschedule event errors

[WordPress Trac]

#57271: Cron unschedule / reschedule event errors
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 Reporter:  domainsupport               |       Owner:  audrasjb
     Type:  defect (bug)                |      Status:  assigned
 Priority:  normal                      |   Milestone:  Awaiting Review
Component:  Cron API                    |     Version:  6.0
 Severity:  normal                      |  Resolution:
 Keywords:  has-patch needs-unit-tests  |     Focuses:
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Comment (by domainsupport):

 Replying to [comment:61 j3gaming]:
 > Replying to [comment:60 galbaras]:
 > > I run O/S crons once every 15 minutes, so definitely not too quickly,
 and still have MANY unschedule & reschedule errors.
 > >
 > > Also, those errors seem to correlate with actual issues, like missed
 scans, so I'm not sure it's just a matter of preventing an update with the
 same value.
 >
 > I don't the frequency you set the cron to run is the issue. I'm thinking
 that your 15min cron, for some reason runs twice. Are you also using
 Linux? Did we all just stumble across an OS bug and we're all in the wrong
 spot to fix it?

 The main server that we ''were'' seeing this issue on (we don't see it
 anymore since we allocated more resources to MySQL) is running Ubuntu
 20.04 and we use an hourly system fired cron. We don't get duplicate cron
 events and never have done that we know of.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57271#comment:62>
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