[wp-trac] [WordPress Trac] #39135: Update to WP 4.7 results in white screen bug

[WordPress Trac]

#39135: Update to WP 4.7 results in white screen bug
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 Reporter:  gaelan           |       Owner:
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Upgrade/Install  |     Version:  4.7
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by charlestonsw):

 Just ran into the same issue on a WP Multisite upgrade.

 No Opcache or other caching of code running on my site.   I am using PHP 7
 and FPM though.

 Now sure how new code for about.php is executing before new code from
 i10n.php but it does seem to be a general problem.

 The error is transient.   The update appears to have worked pulling in the
 new code.  A simple site refresh cleared the problem but the question
 remains - how are some sites executing line 22 of about.php with the
 get_user_locale() call BEFORE the function is loaded from i10n.php?

 Don't want to be another "me too" +1 on this thread.  Trying to provide
 some clues to help isolate and resolve the issue.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39135#comment:13>
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