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

WordPress Trac noreply at wordpress.org
Wed Dec 7 06:46:30 UTC 2016

#39135: Update to WP 4.7 results in white screen bug
 Reporter:  gaelan           |      Owner:
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Upgrade/Install  |    Version:  4.7
 Severity:  normal           |   Keywords:
  Focuses:                   |
 After doing a manual upgrade to WP 4.7, the browser is redirected to:


 and you get a blank white screen.  If you quickly enable PHP debugging and
 refresh the white screen page, you get this error:

 Fatal error: Call to undefined function get_user_locale() in
 /var/www/winshuttle.fr/wp-admin/about.php on line 22

 If you wait about 1-2 minutes and refresh, the admin area works again
 you're taken to the usual "Database upgrade" page at this URL:


 I wonder if this has something to do with the PHP cache not being cleared
 properly after the upgrade operation finishes?


 Two separate installs on two separate servers showed this behavior.  Each
 server is running:

 - Debian 8.6
 - Apache 2.4.10-10
 - PHP 5.6.27 (phpinfo() output: https://gaelanlloyd-
 - MariaDB Client/Server 10.0.28-0

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