Cannot load Zend OPcache - it was already loaded

[matthewlswanson]

We are running our Moodle server on AWS using the Ubuntu 18.04 bionic AMI. Almost twice a second we are getting the message "Cannot load Zend OPcache - it was already loaded" in /var/log/apache2/error.log. We have them set up in auto-scaling groups to spin up or down with workload.

PHP 7.2.24-0ubuntu0.18.04.4 (cli) (built: Apr 8 2020 15:45:57) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v7.2.24-0ubuntu0.18.04.4, Copyright (c) 1999-2018, by Zend Technologies

Our php version is 7.2. I've looked around quite a bit and most people are getting this error due to having 2 versions of opcache.ini in /etc/php/7.2/cli/conf.d but this isn't the case for me:

ls /etc/php/7.2/cli/conf.d 10-opcache.ini 20-apcu_bc.ini 20-curl.ini 20-ftp.ini 20-igbinary.ini 20-mbstring.ini 20-posix.ini 20-simplexml.ini 20-sysvsem.ini 20-xmlreader.ini 20-zip.ini 10-pdo.ini 20-bcmath.ini 20-dom.ini 20-gd.ini 20-intl.ini 20-pdo_pgsql.ini 20-readline.ini 20-soap.ini 20-sysvshm.ini 20-xmlrpc.ini 15-xml.ini 20-calendar.ini 20-exif.ini 20-gettext.ini 20-json.ini 20-pgsql.ini 20-redis.ini 20-sockets.ini 20-tokenizer.ini 20-xmlwriter.ini 20-apcu.ini 20-ctype.ini 20-fileinfo.ini 20-iconv.ini 20-ldap.ini 20-phar.ini 20-shmop.ini 20-sysvmsg.ini 20-wddx.ini 20-xsl.ini

How else can I troubleshoot this? It has been spamming the logs for quite a while. Let me know if there is any other relevant info I can add.

[requinix]

Have you tried grepping for any files that mention opcache?

[matthewlswanson]

On 4/27/2020 at 4:21 PM, requinix said:

Have you tried grepping for any files that mention opcache?

I just ran a grep -r for the string opcache and there are hundreds if not thousands of results. Anything specific I should be looking for in the results?

[requinix]

Actually, before that,
You're having the problem through Apache but you were looking at the CLI configuration files. You need to look in /etc/php/7.2/apache2 (I think) for the appropriate configuration files.

But if you still don't see it there, first grep through /etc/php/7.2/apache2. There should not be many results at all. Look for references to the INI file or the extension's .so.
The next place would be /etc/apache2 in case someone put PHP configuration settings in there.
After that comes your website's configuration.

[matthewlswanson]

3 hours ago, requinix said:

Actually, before that,
You're having the problem through Apache but you were looking at the CLI configuration files. You need to look in /etc/php/7.2/apache2 (I think) for the appropriate configuration files.

But if you still don't see it there, first grep through /etc/php/7.2/apache2. There should not be many results at all. Look for references to the INI file or the extension's .so.
The next place would be /etc/apache2 in case someone put PHP configuration settings in there.
After that comes your website's configuration.

Thanks for the response!

 

I'm looking in /etc/php/7.2/apache2/conf.d/ and here is the list of files, looks like the linking to /etc/php/7.2/mods-available:

/etc/php/7.2/apache2/conf.d$ ls -l
total 0
lrwxrwxrwx 1 root root 39 Oct 22  2018 10-opcache.ini -> /etc/php/7.2/mods-available/opcache.ini
lrwxrwxrwx 1 root root 35 Oct 22  2018 10-pdo.ini -> /etc/php/7.2/mods-available/pdo.ini
lrwxrwxrwx 1 root root 35 Oct 22  2018 15-xml.ini -> /etc/php/7.2/mods-available/xml.ini
lrwxrwxrwx 1 root root 36 Oct 22  2018 20-apcu.ini -> /etc/php/7.2/mods-available/apcu.ini
lrwxrwxrwx 1 root root 39 Oct 22  2018 20-apcu_bc.ini -> /etc/php/7.2/mods-available/apcu_bc.ini
lrwxrwxrwx 1 root root 38 Feb 14  2019 20-bcmath.ini -> /etc/php/7.2/mods-available/bcmath.ini
lrwxrwxrwx 1 root root 40 Oct 22  2018 20-calendar.ini -> /etc/php/7.2/mods-available/calendar.ini
lrwxrwxrwx 1 root root 37 Oct 22  2018 20-ctype.ini -> /etc/php/7.2/mods-available/ctype.ini
lrwxrwxrwx 1 root root 36 Oct 22  2018 20-curl.ini -> /etc/php/7.2/mods-available/curl.ini
lrwxrwxrwx 1 root root 35 Oct 22  2018 20-dom.ini -> /etc/php/7.2/mods-available/dom.ini
lrwxrwxrwx 1 root root 36 Oct 22  2018 20-exif.ini -> /etc/php/7.2/mods-available/exif.ini
lrwxrwxrwx 1 root root 40 Oct 22  2018 20-fileinfo.ini -> /etc/php/7.2/mods-available/fileinfo.ini
lrwxrwxrwx 1 root root 35 Oct 22  2018 20-ftp.ini -> /etc/php/7.2/mods-available/ftp.ini
lrwxrwxrwx 1 root root 34 Oct 22  2018 20-gd.ini -> /etc/php/7.2/mods-available/gd.ini
lrwxrwxrwx 1 root root 39 Oct 22  2018 20-gettext.ini -> /etc/php/7.2/mods-available/gettext.ini
lrwxrwxrwx 1 root root 37 Oct 22  2018 20-iconv.ini -> /etc/php/7.2/mods-available/iconv.ini
lrwxrwxrwx 1 root root 40 Nov  6  2018 20-igbinary.ini -> /etc/php/7.2/mods-available/igbinary.ini
lrwxrwxrwx 1 root root 36 Oct 22  2018 20-intl.ini -> /etc/php/7.2/mods-available/intl.ini
lrwxrwxrwx 1 root root 36 Oct 22  2018 20-json.ini -> /etc/php/7.2/mods-available/json.ini
lrwxrwxrwx 1 root root 36 Oct 22  2018 20-ldap.ini -> /etc/php/7.2/mods-available/ldap.ini
lrwxrwxrwx 1 root root 40 Oct 22  2018 20-mbstring.ini -> /etc/php/7.2/mods-available/mbstring.ini
lrwxrwxrwx 1 root root 41 Oct 22  2018 20-pdo_pgsql.ini -> /etc/php/7.2/mods-available/pdo_pgsql.ini
lrwxrwxrwx 1 root root 37 Oct 22  2018 20-pgsql.ini -> /etc/php/7.2/mods-available/pgsql.ini
lrwxrwxrwx 1 root root 36 Oct 22  2018 20-phar.ini -> /etc/php/7.2/mods-available/phar.ini
lrwxrwxrwx 1 root root 37 Oct 22  2018 20-posix.ini -> /etc/php/7.2/mods-available/posix.ini
lrwxrwxrwx 1 root root 40 Oct 22  2018 20-readline.ini -> /etc/php/7.2/mods-available/readline.ini
lrwxrwxrwx 1 root root 37 Nov  6  2018 20-redis.ini -> /etc/php/7.2/mods-available/redis.ini
lrwxrwxrwx 1 root root 37 Oct 22  2018 20-shmop.ini -> /etc/php/7.2/mods-available/shmop.ini
lrwxrwxrwx 1 root root 41 Oct 22  2018 20-simplexml.ini -> /etc/php/7.2/mods-available/simplexml.ini
lrwxrwxrwx 1 root root 36 Oct 22  2018 20-soap.ini -> /etc/php/7.2/mods-available/soap.ini
lrwxrwxrwx 1 root root 39 Oct 22  2018 20-sockets.ini -> /etc/php/7.2/mods-available/sockets.ini
lrwxrwxrwx 1 root root 39 Oct 22  2018 20-sysvmsg.ini -> /etc/php/7.2/mods-available/sysvmsg.ini
lrwxrwxrwx 1 root root 39 Oct 22  2018 20-sysvsem.ini -> /etc/php/7.2/mods-available/sysvsem.ini
lrwxrwxrwx 1 root root 39 Oct 22  2018 20-sysvshm.ini -> /etc/php/7.2/mods-available/sysvshm.ini
lrwxrwxrwx 1 root root 41 Oct 22  2018 20-tokenizer.ini -> /etc/php/7.2/mods-available/tokenizer.ini
lrwxrwxrwx 1 root root 36 Oct 22  2018 20-wddx.ini -> /etc/php/7.2/mods-available/wddx.ini
lrwxrwxrwx 1 root root 41 Oct 22  2018 20-xmlreader.ini -> /etc/php/7.2/mods-available/xmlreader.ini
lrwxrwxrwx 1 root root 38 Oct 22  2018 20-xmlrpc.ini -> /etc/php/7.2/mods-available/xmlrpc.ini
lrwxrwxrwx 1 root root 41 Oct 22  2018 20-xmlwriter.ini -> /etc/php/7.2/mods-available/xmlwriter.ini
lrwxrwxrwx 1 root root 35 Oct 22  2018 20-xsl.ini -> /etc/php/7.2/mods-available/xsl.ini
lrwxrwxrwx 1 root root 35 Oct 22  2018 20-zip.ini -> /etc/php/7.2/mods-available/zip.ini

And here are the contents of opcache.ini

/etc/php/7.2/mods-available$ cat opcache.ini
; configuration for php opcache module
; priority=10
zend_extension=opcache.so

And here is what I get when I do a grep -r 'opcache' . of the php directory

/etc/php/7.2$ sudo grep -r 'opcache' .
./mods-available/opcache.ini:; configuration for php opcache module
./mods-available/opcache.ini:zend_extension=opcache.so
./cli/php.ini:[opcache]
./cli/php.ini:;opcache.enable=1
./cli/php.ini:;opcache.enable_cli=0
./cli/php.ini:;opcache.memory_consumption=128
./cli/php.ini:;opcache.interned_strings_buffer=8
./cli/php.ini:;opcache.max_accelerated_files=10000
./cli/php.ini:;opcache.max_wasted_percentage=5
./cli/php.ini:;opcache.use_cwd=1
./cli/php.ini:;opcache.validate_timestamps=1
./cli/php.ini:;opcache.revalidate_freq=2
./cli/php.ini:;opcache.revalidate_path=0
./cli/php.ini:;opcache.save_comments=1
./cli/php.ini:;opcache.enable_file_override=0
./cli/php.ini:;opcache.optimization_level=0xffffffff
./cli/php.ini:;opcache.inherited_hack=1
./cli/php.ini:;opcache.dups_fix=0
./cli/php.ini:;opcache.blacklist_filename=
./cli/php.ini:;opcache.max_file_size=0
./cli/php.ini:;opcache.consistency_checks=0
./cli/php.ini:;opcache.force_restart_timeout=180
./cli/php.ini:;opcache.error_log=
./cli/php.ini:;opcache.log_verbosity_level=1
./cli/php.ini:;opcache.preferred_memory_model=
./cli/php.ini:;opcache.protect_memory=0
./cli/php.ini:;opcache.restrict_api=
./cli/php.ini:;opcache.mmap_base=
./cli/php.ini:;opcache.file_cache=
./cli/php.ini:;opcache.file_cache_only=0
./cli/php.ini:;opcache.file_cache_consistency_checks=1
./cli/php.ini:; Implies opcache.file_cache_only=1 for a certain process that failed to
./cli/php.ini:;opcache.file_cache_fallback=1
./cli/php.ini:;opcache.huge_code_pages=1
./cli/php.ini:;opcache.validate_permission=0
./cli/php.ini:;opcache.validate_root=0
./cli/php.ini:;opcache.opt_debug_level=0
./cli/php.ini.ucf-dist:[opcache]
./cli/php.ini.ucf-dist:;opcache.enable=1
./cli/php.ini.ucf-dist:;opcache.enable_cli=0
./cli/php.ini.ucf-dist:;opcache.memory_consumption=128
./cli/php.ini.ucf-dist:;opcache.interned_strings_buffer=8
./cli/php.ini.ucf-dist:;opcache.max_accelerated_files=10000
./cli/php.ini.ucf-dist:;opcache.max_wasted_percentage=5
./cli/php.ini.ucf-dist:;opcache.use_cwd=1
./cli/php.ini.ucf-dist:;opcache.validate_timestamps=1
./cli/php.ini.ucf-dist:;opcache.revalidate_freq=2
./cli/php.ini.ucf-dist:;opcache.revalidate_path=0
./cli/php.ini.ucf-dist:;opcache.save_comments=1
./cli/php.ini.ucf-dist:;opcache.enable_file_override=0
./cli/php.ini.ucf-dist:;opcache.optimization_level=0xffffffff
./cli/php.ini.ucf-dist:;opcache.inherited_hack=1
./cli/php.ini.ucf-dist:;opcache.dups_fix=0
./cli/php.ini.ucf-dist:;opcache.blacklist_filename=
./cli/php.ini.ucf-dist:;opcache.max_file_size=0
./cli/php.ini.ucf-dist:;opcache.consistency_checks=0
./cli/php.ini.ucf-dist:;opcache.force_restart_timeout=180
./cli/php.ini.ucf-dist:;opcache.error_log=
./cli/php.ini.ucf-dist:;opcache.log_verbosity_level=1
./cli/php.ini.ucf-dist:;opcache.preferred_memory_model=
./cli/php.ini.ucf-dist:;opcache.protect_memory=0
./cli/php.ini.ucf-dist:;opcache.restrict_api=
./cli/php.ini.ucf-dist:;opcache.mmap_base=
./cli/php.ini.ucf-dist:;opcache.file_cache=
./cli/php.ini.ucf-dist:;opcache.file_cache_only=0
./cli/php.ini.ucf-dist:;opcache.file_cache_consistency_checks=1
./cli/php.ini.ucf-dist:; Implies opcache.file_cache_only=1 for a certain process that failed to
./cli/php.ini.ucf-dist:;opcache.file_cache_fallback=1
./cli/php.ini.ucf-dist:;opcache.huge_code_pages=1
./cli/php.ini.ucf-dist:;opcache.validate_permission=0
./cli/php.ini.ucf-dist:;opcache.validate_root=0
./cli/php.ini.ucf-dist:;opcache.opt_debug_level=0
./apache2/php.ini:zend_extension = /usr/lib/php/20170718/opcache.so
./apache2/php.ini:[opcache]
./apache2/php.ini:opcache.enable=1
./apache2/php.ini:;opcache.enable_cli=0
./apache2/php.ini:opcache.memory_consumption=128
./apache2/php.ini:;opcache.interned_strings_buffer=8
./apache2/php.ini:opcache.max_accelerated_files=10000
./apache2/php.ini:;opcache.max_wasted_percentage=5
./apache2/php.ini:opcache.use_cwd=1
./apache2/php.ini:opcache.validate_timestamps=1
./apache2/php.ini:opcache.revalidate_freq=60
./apache2/php.ini:;opcache.revalidate_path=0
./apache2/php.ini:opcache.save_comments=1
./apache2/php.ini:opcache.enable_file_override=0
./apache2/php.ini:;opcache.optimization_level=0xffffffff
./apache2/php.ini:;opcache.inherited_hack=1
./apache2/php.ini:;opcache.dups_fix=0
./apache2/php.ini:;opcache.blacklist_filename=
./apache2/php.ini:;opcache.max_file_size=0
./apache2/php.ini:;opcache.consistency_checks=0
./apache2/php.ini:;opcache.force_restart_timeout=180
./apache2/php.ini:;opcache.error_log=
./apache2/php.ini:;opcache.log_verbosity_level=1
./apache2/php.ini:;opcache.preferred_memory_model=
./apache2/php.ini:;opcache.protect_memory=0
./apache2/php.ini:;opcache.restrict_api=
./apache2/php.ini:;opcache.mmap_base=
./apache2/php.ini:;opcache.file_cache=
./apache2/php.ini:;opcache.file_cache_only=0
./apache2/php.ini:;opcache.file_cache_consistency_checks=1
./apache2/php.ini:; Implies opcache.file_cache_only=1 for a certain process that failed to
./apache2/php.ini:;opcache.file_cache_fallback=1
./apache2/php.ini:;opcache.huge_code_pages=1
./apache2/php.ini:;opcache.validate_permission=0
./apache2/php.ini:;opcache.validate_root=0
./apache2/php.ini:;opcache.opt_debug_level=0
./apache2/php.ini.ucf-dist:[opcache]
./apache2/php.ini.ucf-dist:;opcache.enable=1
./apache2/php.ini.ucf-dist:;opcache.enable_cli=0
./apache2/php.ini.ucf-dist:;opcache.memory_consumption=128
./apache2/php.ini.ucf-dist:;opcache.interned_strings_buffer=8
./apache2/php.ini.ucf-dist:;opcache.max_accelerated_files=10000
./apache2/php.ini.ucf-dist:;opcache.max_wasted_percentage=5
./apache2/php.ini.ucf-dist:;opcache.use_cwd=1
./apache2/php.ini.ucf-dist:;opcache.validate_timestamps=1
./apache2/php.ini.ucf-dist:;opcache.revalidate_freq=2
./apache2/php.ini.ucf-dist:;opcache.revalidate_path=0
./apache2/php.ini.ucf-dist:;opcache.save_comments=1
./apache2/php.ini.ucf-dist:;opcache.enable_file_override=0
./apache2/php.ini.ucf-dist:;opcache.optimization_level=0xffffffff
./apache2/php.ini.ucf-dist:;opcache.inherited_hack=1
./apache2/php.ini.ucf-dist:;opcache.dups_fix=0
./apache2/php.ini.ucf-dist:;opcache.blacklist_filename=
./apache2/php.ini.ucf-dist:;opcache.max_file_size=0
./apache2/php.ini.ucf-dist:;opcache.consistency_checks=0
./apache2/php.ini.ucf-dist:;opcache.force_restart_timeout=180
./apache2/php.ini.ucf-dist:;opcache.error_log=
./apache2/php.ini.ucf-dist:;opcache.log_verbosity_level=1
./apache2/php.ini.ucf-dist:;opcache.preferred_memory_model=
./apache2/php.ini.ucf-dist:;opcache.protect_memory=0
./apache2/php.ini.ucf-dist:;opcache.restrict_api=
./apache2/php.ini.ucf-dist:;opcache.mmap_base=
./apache2/php.ini.ucf-dist:;opcache.file_cache=
./apache2/php.ini.ucf-dist:;opcache.file_cache_only=0
./apache2/php.ini.ucf-dist:;opcache.file_cache_consistency_checks=1
./apache2/php.ini.ucf-dist:; Implies opcache.file_cache_only=1 for a certain process that failed to
./apache2/php.ini.ucf-dist:;opcache.file_cache_fallback=1
./apache2/php.ini.ucf-dist:;opcache.huge_code_pages=1
./apache2/php.ini.ucf-dist:;opcache.validate_permission=0
./apache2/php.ini.ucf-dist:;opcache.validate_root=0
./apache2/php.ini.ucf-dist:;opcache.opt_debug_level=0

sudo grep -r 'opcache' /etc/apache2/ returned no results

 

And just for kicks

/etc/php/7.2$ sudo grep -r 'opcache.so' .
./mods-available/opcache.ini:zend_extension=opcache.so
./apache2/php.ini:zend_extension = /usr/lib/php/20170718/opcache.so

 

[requinix]

14 minutes ago, matthewlswanson said:

And just for kicks

/etc/php/7.2$ sudo grep -r 'opcache.so' .
./mods-available/opcache.ini:zend_extension=opcache.so
./apache2/php.ini:zend_extension = /usr/lib/php/20170718/opcache.so

 

There's the problem. Your distro manages PHP extensions with the INI files, where opcache is enabled, but there's also a modification to your php.ini to load it again.

Open up php.ini and remove the zend_extension line. Then look nearby for other edits that also don't belong in that file.

[matthewlswanson]

23 hours ago, requinix said:

There's the problem. Your distro manages PHP extensions with the INI files, where opcache is enabled, but there's also a modification to your php.ini to load it again.

Open up php.ini and remove the zend_extension line. Then look nearby for other edits that also don't belong in that file.

I think you're right! That file it is pointing to no longer exists and I should comment it out. I will have to wait a couple weeks because this is finals week for our students and we absolutely cannot make changes on production until grading it done. I will keep this page up and comment when I am able to change it and confirm.

 

Thank you so much, you are a wizard!

[requinix]

It no longer exists? I assume it existed when Apache was last restarted?

[matthewlswanson]

On 4/30/2020 at 1:59 PM, requinix said:

It no longer exists? I assume it existed when Apache was last restarted?

Correct, it's pointing to a file that must have been there years ago but is no longer there. Commenting out that line fixed the message from spamming us! Thank you so much!