[wp-trac] [WordPress Trac] #28167: Intermittent hanging of scripts when loading plugins.php or update-core.php

[WordPress Trac]

#28167: Intermittent hanging of scripts when loading plugins.php or update-core.php
---------------------------+-----------------------------
 Reporter:  ryan.burnette  |      Owner:
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  General        |    Version:  3.9
 Severity:  normal         |   Keywords:
  Focuses:                 |
---------------------------+-----------------------------
 When loading plugins.php or update-core.php I am intermittently having the
 process hang, and the subsequent dump fails. This is happening on multiple
 sites. All are running WordPress 3.9.

 The configuration is the same on each server. Ubuntu 14.04, Nginx 1.6.0
 and PHP 5.5.9. I'm using php5-fpm referenced through a .sock. Let me know
 if I need to provide more detail there.

 I changed my PHP settings to log slow requests and this is what appears in
 the log.

 `[07-May-2014 13:19:08]  [pool www] pid 5020
 script_filename = /srv/staging.mysite.com/wordpress/wp-admin/update-
 core.php
 [0x00007f77aa537b68] fread() /srv/staging.mysite.com/wordpress/wp-includes
 /class-http.php:1008
 [0x00007f77aa5379c0] request() /srv/staging.mysite.com/wordpress/wp-
 includes/class-http.php:333
 [0x00007f77aa5377d8] _dispatch_request() /srv/staging.mysite.com/wordpress
 /wp-includes/class-http.php:249
 [0x00007f77aa537660] request() /srv/staging.mysite.com/wordpress/wp-
 includes/class-http.php:378
 [0x00007f77aa537538] post() /srv/staging.mysite.com/wordpress/wp-
 includes/http.php:195
 [0x00007f77aa537428] wp_remote_post() /srv/staging.mysite.com/wordpress
 /wp-content/plugins/acf-gallery/acf-gallery-update.php:136
 [0x00007f77aa537310] get_remote() /srv/staging.mysite.com/wordpress/wp-
 content/plugins/acf-gallery/acf-gallery-update.php:165
 [0x00007fff2e87c320] check_update() unknown:0
 [0x00007f77aa537178] call_user_func_array()
 /srv/staging.mysite.com/wordpress/wp-includes/plugin.php:192
 [0x00007f77aa537000] apply_filters() /srv/staging.mysite.com/wordpress/wp-
 includes/option.php:1379
 [0x00007f77aa536d98] set_site_transient()
 /srv/staging.mysite.com/wordpress/wp-includes/update.php:253
 [0x00007fff2e87c9a0] wp_update_plugins() unknown:0
 [0x00007f77aa536bb0] call_user_func_array()
 /srv/staging.mysite.com/wordpress/wp-includes/plugin.php:470
 [0x00007f77aa5369c8] do_action() /srv/staging.mysite.com/wordpress/wp-
 admin/admin.php:315
 [0x00007f77aa536808] +++ dump failed`

 Through my troubleshooting I have found that this is not related to a
 plugin. It happens even when I completely empty the plugins directory.

 I want to troubleshoot further to determine if there's a bug or
 incompatibility here but I'm not sure what to try next.

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Ticket URL: <https://core.trac.wordpress.org/ticket/28167>
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