[wp-trac] [WordPress Trac] #39243: fatal error by upgrading to WordPress 4.7 from 4.6

[WordPress Trac]

#39243: fatal error by upgrading to WordPress 4.7 from 4.6
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 Reporter:  websitenum1   |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Taxonomy      |     Version:  4.7
 Severity:  normal        |  Resolution:
 Keywords:  close         |     Focuses:
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Changes (by dd32):

 * keywords:   => close


Comment:

 This appears to be caused by either
 a) A bad update - `wp-includes/taxonomy.php` / `wp-includes/version.php`
 updated but `wp-settings.php` didn't
 or
 b) A bad plugin - which includes `wp-includes/session.php` & `wp-
 includes/taxonomy.php` but not their dependencies before WordPress is
 fully loaded.

 It's much more likely that these have been caused by failed updates IMHO,
 rather than a plugin, seems like an odd thing for a plugin to do - I can't
 rule it out though.
 This would be a very common failure in the event that `wp-settings.php`
 didn't get updated, or the `wp-includes/class-wp-taxonomy.php` file didn't
 get created, as it's the first real piece of code which runs which has
 dependancies upon new files.

 Unfortunately update issues are going to happen occasionally, and I don't
 see anything we can do here.

 @websitenum1 Were you able to do any debugging of your site to determine
 the cause of your problems? I note that it's currently running WordPress
 4.7.1

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Ticket URL: <https://core.trac.wordpress.org/ticket/39243#comment:3>
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