[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:  needs-unit-tests needs-patch  |     Focuses:
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Comment (by galbaras):

 Maybe I'm missing something, but could this output not be described as "2
 crons ran successfully, then 1 triggered an error, then 1 ran succefully,
 and another 1 triggering an error, then 3 ran successfully"?

 The error MAY imply concurrent crons, but are we **sure** that's what's
 causing it?

 @emilycestmoi Could you perhaps use this code to catch those duplicates in
 the act:

 {{{#!php
 /*
  * The cron lock (a unix timestamp set when the cron was spawned),
  * must match $doing_wp_cron (the "key").
  */
 if ( $doing_cron_transient !== $doing_wp_cron ) {
     error_log( "doing_cron_transient: "$doing_cron_transient,
 doing_wp_cron: $doing_wp_cron \n", 0 );
     return;
 } else {
     error_log( "identical cron transients: $doing_cron_transient \n", 0 );
 }
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/57271#comment:78>
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