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Bug #80862 "Class not found" using Opcache & Xenforo
Submitted: 2021-03-14 11:55 UTC Modified: 2021-03-17 21:42 UTC
From: alex at ndros dot com Assigned: cmb (profile)
Status: Not a bug Package: opcache
PHP Version: 7.4.16 OS: Windows Server 2019
Private report: No CVE-ID: None
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From: alex at ndros dot com
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 [2021-03-14 11:55 UTC] alex at ndros dot com 
Description:
------------
Hi,

We're using PHP 7.4.16 NTS with Opcache. 
We randomly get "class not found" errors with the software that we run (Xenforo 2.2).

For example:

Class 'XF\Mvc\Entity\Repository' not found

This is solved after an IIS reset, but after a few minutes, we may get the same on another class not found error.

Our Opcache config is:

[OPCACHE]
zend_extension = "php_opcache.dll"
opcache.memory_consumption=256
opcache.cache_id=node1
opcache.error_log="D:\temp\php\opcache.log"
opcache.validate_timestamps=1
opcache.revalidate_freq=30
opcache.interned_strings_buffer=32
opcache.save_comments=0
opcache.max_file_size=0
opcache.file_update_protection=2
;opcache.file_cache_consistency_checks=0 // not used
;opcache.file_cache="D:\temp\php\opcache_filecache" // not used
opcache.max_accelerated_files=10000
opcache.log_verbosity_level=4
opcache.blacklist_filename= "D:\inetpub\wwwroot\******.com\conf\opcache\opcache-blacklist.txt"
opcache.enable_cli=1
opcache.max_wasted_percentage=10

Thank you
Alex

Test script:
---------------
We haven't found a specific way to reproduce the issue.

Expected result:
----------------
We haven't found a specific way to reproduce the issue.

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 [2021-03-14 11:57 UTC] alex at ndros dot com
-Operating System: Windows 2019 +Operating System: Windows Server 2019
 [2021-03-14 11:57 UTC] alex at ndros dot com 
Typo: we may get the same OR another class not found error.
 [2021-03-15 09:17 UTC] cmb@php.net 
Does this happen after you modified some of the PHP files?

Are there other PHP processes running for the same user with the
same cache_id?

Are there any relevant warnings in the OPcache error log?
 [2021-03-15 09:17 UTC] cmb@php.net
-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb
 [2021-03-15 14:01 UTC] alex at ndros dot com
-Status: Feedback +Status: Assigned
 [2021-03-15 14:01 UTC] alex at ndros dot com 
Hi,

No, there's no modification on the files. This appears to happen randomly.

---Are there other PHP processes running for the same user with the
same cache_id?

I'm not sure about that. We do use 2 worker processes for the IIS application pool. We did try to use just 1, but the error happens with this configuration as well.

----Are there any relevant warnings in the OPcache error log?

No, the OPcache error log only contains entries like:

Message Cached script
Message Added key
Debug Loading blacklist file:
 [2021-03-15 14:50 UTC] cmb@php.net 
> We do use 2 worker processes for the IIS application pool. We
> did try to use just 1, but the error happens with this
> configuration as well.

Nonetheless, please try

    opcache.cache_id=${APP_POOL_ID}

and use separate application pools for different applications.
 [2021-03-15 14:50 UTC] cmb@php.net
-Status: Assigned +Status: Feedback
 [2021-03-15 19:38 UTC] alex at ndros dot com 
ah nice, I didn't know I could use an environment var in php.ini
we've done:

opcache.cache_id=${APP_POOL_ID}

and also running different application pool for each app (joomla, xenforo).

I will report if this solves our problem.

Thanks !
 [2021-03-17 20:00 UTC] alex at ndros dot com
-Status: Feedback +Status: Assigned
 [2021-03-17 20:00 UTC] alex at ndros dot com 
Hi,

It seems that the new configuration has solved our issue.

Thank you
 [2021-03-17 21:42 UTC] cmb@php.net
-Status: Assigned +Status: Not a bug
 [2021-03-17 21:42 UTC] cmb@php.net 
> It seems that the new configuration has solved our issue.

Happy to hear that!  Thanks for the confirmation.
 
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