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Bug #59352 WordPress plugin updates do not work with WinCache object-cache.php
Submitted: 2010-08-09 18:56 UTC Modified: 2011-03-31 13:57 UTC
From: Assigned: ksingla (profile)
Status: Closed Package: WinCache (PECL)
PHP Version: 5.3.1 OS: Windows Server 2008
Private report: No CVE-ID: None
 [2010-08-09 18:56 UTC]
I've been having a problem with Wordpress and it seems to be caused by wincache. Several others have reported the same problem on the forums

Essentially what happens is when attempting to upgrade a Wordpress plugin, the upgrade fails with a message similar to this -

Unpacking the update.
Installing the latest version.
Deactivating the plugin.
Removing the old version of the plugin.
Could not create directory. DIRECTORY\wwwroot/wp-content/plugins/akismet/
Plugin upgrade Failed. 

I'm running Wordpress 2.9.2 on a Windows 2008R2 VPS, with PHP 5.2.13 and wincache 1.1

Checking on the VPS, the plugin directory is there but inaccessible even as an administrator, with "access is denied". Restarting IIS results in the folder disappearing. The plugin can then be installed.

Clearly there's some locking problem occurring somewhere. Disabling wincache stops the problem.

Reproduce code:
Use the object-cache.php from here:


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 [2010-09-24 03:30 UTC] ksingla at microsoft dot com
Fix checked in trunk. This fix will be part of WinCache 1.2 release.
 [2011-01-20 15:44 UTC] ruslany at microsoft dot com
This still repros with the latest build.
 [2011-03-31 13:57 UTC] ruslany at microsoft dot com
This bug has been fixed in SVN.

In case this was a documentation problem, the fix will show up at the
end of next Sunday (CET) on

In case this was a website problem, the change will show
up on the website in short time.
Thank you for the report, and for helping us make PECL better.

The build with the fix is available here:
 [2011-08-29 14:18 UTC] ukcleaners at mail dot com
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 [2012-01-18 10:27 UTC] revfanatic at hotmail dot com
I am running WinCache for PHP on IIS7.5 with PHP 5.3.9 and WordPress 3.3.1 installed. 
Obviously, the latest official 1.1 release of WinCache causes WordPress plugin upgrades to fail.
On this server, dev version 1.2.427 does work and solves the plugin upgrades problem.
 Dev version 1.2.614 also seems to work well. 
 However, dev version 1.2.1208 does not work; the plugin upgrades problem appears with that version.
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