I just encountered the following WordPress upgrade error when moving to 3.6 (though you may be experiencing it with WordPress 3.7 or newer):
Fatal error: Cannot redeclare _wp_post_revision_fields() in /home/xxxx/public_html/xxxx/wp-includes/revision.php on line 25
Pesky, huh? Easily fixed though. Download the latest copy of WordPress, then connect to your site via FTP. Rename wp-includes (or delete it) and upload a new copy from your newly downloaded version.
All should now be well!
It may have been related to my server load at the time causing a timeout.
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