From fe0b8a2aaf49ff5f33a866309ed8730fd7675674 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Fri, 10 Feb 2017 03:09:43 +0000
Subject: [PATCH] Pings/Trackbacks: Avoid scheduling multiple `do_pings` events
 in `_publish_post_hook()`.

Props ethitter.
Fixes #39828.
Built from https://develop.svn.wordpress.org/trunk@40054


git-svn-id: http://core.svn.wordpress.org/trunk@39991 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/post.php    | 4 +++-
 wp-includes/version.php | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/wp-includes/post.php b/wp-includes/post.php
index d879491910..a33236cc7f 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -5932,7 +5932,9 @@ function _publish_post_hook( $post_id ) {
 		add_post_meta( $post_id, '_pingme', '1' );
 	add_post_meta( $post_id, '_encloseme', '1' );
 
-	wp_schedule_single_event(time(), 'do_pings');
+	if ( ! wp_next_scheduled( 'do_pings' ) ) {
+		wp_schedule_single_event( time(), 'do_pings' );
+	}
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 194943f16a..b48f2d2f33 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-40053';
+$wp_version = '4.8-alpha-40054';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.