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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 22.2.6
Operating system and version (eg, Ubuntu 20.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.29
PHP version (eg, 7.4): 7.3.33
The issue you are facing:
I’ve been upgrading my NextCloud server from version 18 all the way up to 22, including upgrading MariaDB to a supported version. With NC18, the server was synchronising correctly with LDAP for users and groups but, after going through all of the upgrades, a lot of the groups are not being populated with members.
There is a “disconnect” between what NextCloud says about the groups a user is in:
$ /usr/bin/php7.3 occ user:info pierrick.bouvier
- user_id: pierrick.bouvier
- display_name: Pierrick Bouvier
- email: REDACTED
- cloud_id: REDACTED
- enabled: true
- groups:
- team-woa
- quota: none
- last_seen: 2022-04-08T07:35:52+00:00
- user_directory: /srv/nextcloud-data/pierrick.bouvier
- backend: LDAP
and the membership of a group:
$ /usr/bin/php7.3 occ group:info team-woa
- groupID: team-woa
- displayName: team-woa
- backends:
- LDAP
I can’t find a way of getting NextCloud to “rescan” the LDAP groups and refresh its group membership information.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Configure system to use LDAP
- Upgrade from 18 all the way up to 22
- Check group membership
The output of your Nextcloud log in Admin > Logging:
{"reqId":"mwZ17Vwb1zJi8VoRJw5b","level":3,"time":"2022-04-08T07:28:58+00:00","remoteAddr":"83.226.143.29","user":"diana.picus","app":"PHP","method":"GET","url":"/apps/files/?dir=/WoA","message":"disk_free_space(): No such file or directory at /srv/nextcloud-18/lib/private/Files/Storage/Local.php#381","userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36","version":"22.2.6.2","exception":{"Exception":"Error","Message":"disk_free_space(): No such file or directory at /srv/nextcloud-18/lib/private/Files/Storage/Local.php#381","Code":0,"Trace":[{"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::","args":[2,"disk_free_space(): No such file or directory","/srv/nextcloud-18/lib/private/Files/Storage/Local.php",381,{"path":"files","sourcePath":"/srv/nextcloud-data/diana.picus"}]},{"file":"/srv/nextcloud-18/lib/private/Files/Storage/Local.php","line":381,"function":"disk_free_space","args":["/srv/nextcloud-data/diana.picus"]},{"file":"/srv/nextcloud-18/lib/private/Files/Storage/Wrapper/Wrapper.php","line":334,"function":"free_space","class":"OC\\Files\\Storage\\Local","type":"->","args":["files"]},{"file":"/srv/nextcloud-18/lib/private/legacy/OC_Helper.php","line":534,"function":"free_space","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->","args":["files"]},{"file":"/srv/nextcloud-18/apps/files/lib/Controller/ViewController.php","line":154,"function":"getStorageInfo","class":"OC_Helper","type":"::","args":["/",{"__class__":"OC\\Files\\FileInfo"}]},{"file":"/srv/nextcloud-18/apps/files/lib/Controller/ViewController.php","line":204,"function":"getStorageInfo","class":"OCA\\Files\\Controller\\ViewController","type":"->","args":[]},{"file":"/srv/nextcloud-18/lib/private/AppFramework/Http/Dispatcher.php","line":217,"function":"index","class":"OCA\\Files\\Controller\\ViewController","type":"->","args":["/WoA","",null,false,null]},{"file":"/srv/nextcloud-18/lib/private/AppFramework/Http/Dispatcher.php","line":126,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Files\\Controller\\ViewController"},"index"]},{"file":"/srv/nextcloud-18/lib/private/AppFramework/App.php","line":156,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Files\\Controller\\ViewController"},"index"]},{"file":"/srv/nextcloud-18/lib/private/Route/Router.php","line":302,"function":"main","class":"OC\\AppFramework\\App","type":"::","args":["OCA\\Files\\Controller\\ViewController","index",{"__class__":"OC\\AppFramework\\DependencyInjection\\DIContainer"},{"_route":"files.view.index"}]},{"file":"/srv/nextcloud-18/lib/base.php","line":1006,"function":"match","class":"OC\\Route\\Router","type":"->","args":["/apps/files/"]},{"file":"/srv/nextcloud-18/index.php","line":36,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"/srv/nextcloud-18/lib/private/Log/ErrorHandler.php","Line":92,"CustomMessage":"--"},"id":"624fe49cd69f3"}
{"reqId":"XV37oL14KEvRNiKDqrgt","level":3,"time":"2022-04-08T07:22:08+00:00","remoteAddr":"92.11.187.118","user":"philip.colmer","app":"PHP","method":"GET","url":"/settings/admin/serverinfo","message":"Undefined offset: 4 at /srv/nextcloud-18/apps/serverinfo/templates/settings-admin.php#38","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.60 Safari/537.36 Edg/100.0.1185.29","version":"22.2.6.2","exception":{"Exception":"Error","Message":"Undefined offset: 4 at /srv/nextcloud-18/apps/serverinfo/templates/settings-admin.php#38","Code":0,"Trace":[{"file":"/srv/nextcloud-18/apps/serverinfo/templates/settings-admin.php","line":38,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::","args":[8,"Undefined offset: 4","/srv/nextcloud-18/apps/serverinfo/templates/settings-admin.php",38,{"byte":7.999999578005372,"count":4}]},{"file":"/srv/nextcloud-18/apps/serverinfo/templates/settings-admin.php","line":142,"function":"FormatMegabytes","args":[7.999999578005372]},{"file":"/srv/nextcloud-18/lib/private/Template/Base.php","line":180,"args":["/srv/nextcloud-18/apps/serverinfo/templates/settings-admin.php"],"function":"include"},{"file":"/srv/nextcloud-18/lib/private/Template/Base.php","line":150,"function":"load","class":"OC\\Template\\Base","type":"->","args":["/srv/nextcloud-18/apps/serverinfo/templates/settings-admin.php",{"0":"And 9 more entries, set log level to debug to see all entries","hostname":"fileserver","osname":"Linux 5.4.0-1071-aws x86_64","memory":{"__class__":"OCA\\ServerInfo\\Resources\\Memory"},"cpu":"Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz (2 cores)","diskinfo":[{"__class__":"OCA\\ServerInfo\\Resources\\Disk"},{"__class__":"OCA\\ServerInfo\\Resources\\Disk"},{"__class__":"OCA\\ServerInfo\\Resources\\Disk"}]}]},{"file":"/srv/nextcloud-18/lib/private/legacy/OC_Template.php","line":179,"function":"fetchPage","class":"OC\\Template\\Base","type":"->","args":[{"0":"And 9 more entries, set log level to debug to see all entries","hostname":"fileserver","osname":"Linux 5.4.0-1071-aws x86_64","memory":{"__class__":"OCA\\ServerInfo\\Resources\\Memory"},"cpu":"Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz (2 cores)","diskinfo":[{"__class__":"OCA\\ServerInfo\\Resources\\Disk"},{"__class__":"OCA\\ServerInfo\\Resources\\Disk"},{"__class__":"OCA\\ServerInfo\\Resources\\Disk"}]}]},{"file":"/srv/nextcloud-18/lib/public/AppFramework/Http/TemplateResponse.php","line":204,"function":"fetchPage","class":"OC_Template","type":"->","args":[{"0":"And 9 more entries, set log level to debug to see all entries","hostname":"fileserver","osname":"Linux 5.4.0-1071-aws x86_64","memory":{"__class__":"OCA\\ServerInfo\\Resources\\Memory"},"cpu":"Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz (2 cores)","diskinfo":[{"__class__":"OCA\\ServerInfo\\Resources\\Disk"},{"__class__":"OCA\\ServerInfo\\Resources\\Disk"},{"__class__":"OCA\\ServerInfo\\Resources\\Disk"}]}]},{"file":"/srv/nextcloud-18/apps/settings/lib/Controller/CommonSettingsTrait.php","line":138,"function":"render","class":"OCP\\AppFramework\\Http\\TemplateResponse","type":"->","args":[]},{"file":"/srv/nextcloud-18/apps/settings/lib/Controller/AdminSettingsController.php","line":82,"function":"formatSettings","class":"OCA\\Settings\\Controller\\AdminSettingsController","type":"->","args":[[[{"__class__":"OCA\\ServerInfo\\Settings\\AdminSettings"}]]]},{"file":"/srv/nextcloud-18/apps/settings/lib/Controller/CommonSettingsTrait.php","line":148,"function":"getSettings","class":"OCA\\Settings\\Controller\\AdminSettingsController","type":"->","args":["serverinfo"]},{"file":"/srv/nextcloud-18/apps/settings/lib/Controller/AdminSettingsController.php","line":67,"function":"getIndexResponse","class":"OCA\\Settings\\Controller\\AdminSettingsController","type":"->","args":["admin","serverinfo"]},{"file":"/srv/nextcloud-18/lib/private/AppFramework/Http/Dispatcher.php","line":217,"function":"index","class":"OCA\\Settings\\Controller\\AdminSettingsController","type":"->","args":["serverinfo"]},{"file":"/srv/nextcloud-18/lib/private/AppFramework/Http/Dispatcher.php","line":126,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Settings\\Controller\\AdminSettingsController"},"index"]},{"file":"/srv/nextcloud-18/lib/private/AppFramework/App.php","line":156,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Settings\\Controller\\AdminSettingsController"},"index"]},{"file":"/srv/nextcloud-18/lib/private/Route/Router.php","line":302,"function":"main","class":"OC\\AppFramework\\App","type":"::","args":["OCA\\Settings\\Controller\\AdminSettingsController","index",{"__class__":"OC\\AppFramework\\DependencyInjection\\DIContainer"},{"section":"serverinfo","_route":"settings.AdminSettings.index"}]},{"file":"/srv/nextcloud-18/lib/base.php","line":1006,"function":"match","class":"OC\\Route\\Router","type":"->","args":["/settings/admin/serverinfo"]},{"file":"/srv/nextcloud-18/index.php","line":36,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"/srv/nextcloud-18/lib/private/Log/ErrorHandler.php","Line":92,"CustomMessage":"--"},"id":"624fe32c17230"}
{"reqId":"NQwt7JmcKvcWtb9vKnBz","level":3,"time":"2022-04-07T13:38:06+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Uninitialized string offset: 0 at /srv/nextcloud-18/core/Command/Maintenance/Mimetype/GenerateMimetypeFileBuilder.php#39","userAgent":"--","version":"22.2.6.2","exception":{"Exception":"Error","Message":"Uninitialized string offset: 0 at /srv/nextcloud-18/core/Command/Maintenance/Mimetype/GenerateMimetypeFileBuilder.php#39","Code":0,"Trace":[{"file":"/srv/nextcloud-18/core/Command/Maintenance/Mimetype/GenerateMimetypeFileBuilder.php","line":39,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::","args":[8,"Uninitialized string offset: 0","/srv/nextcloud-18/core/Command/Maintenance/Mimetype/GenerateMimetypeFileBuilder.php",39,{"k":"*** sensitive parameter replaced ***"}]},{"function":"OC\\Core\\Command\\Maintenance\\Mimetype\\{closure}","class":"OC\\Core\\Command\\Maintenance\\Mimetype\\GenerateMimetypeFileBuilder","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/srv/nextcloud-18/core/Command/Maintenance/Mimetype/GenerateMimetypeFileBuilder.php","line":40,"function":"array_filter","args":[["_comment","_comment2","_comment3","_comment4","_comment5","And 102 more entries, set log level to debug to see all entries"],{"__class__":"Closure"}]},{"file":"/srv/nextcloud-18/apps/onlyoffice/lib/Migration/MimeRepair.php","line":110,"function":"generateFile","class":"OC\\Core\\Command\\Maintenance\\Mimetype\\GenerateMimetypeFileBuilder","type":"->","args":[{"0":"And 102 more entries, set log level to debug to see all entries","_comment":"Array of mimetype aliases.","_comment2":"Any changes you make here will be overwritten on an update of Nextcloud.","_comment3":"Put any custom mappings in a new file mimetypealiases.json in the config/ folder of Nextcloud","_comment4":"After any change to mimetypealiases.json run:","_comment5":"./occ maintenance:mimetype:update-js"}]},{"file":"/srv/nextcloud-18/lib/private/Repair.php","line":124,"function":"run","class":"OCA\\Onlyoffice\\Migration\\MimeRepair","type":"->","args":[{"__class__":"OC\\Repair"}]},{"file":"/srv/nextcloud-18/core/Command/Maintenance/Repair.php","line":125,"function":"run","class":"OC\\Repair","type":"->","args":[]},{"file":"/srv/nextcloud-18/3rdparty/symfony/console/Command/Command.php","line":255,"function":"execute","class":"OC\\Core\\Command\\Maintenance\\Repair","type":"->","args":[{"__class__":"Symfony\\Component\\Console\\Input\\ArgvInput"},{"__class__":"Symfony\\Component\\Console\\Output\\ConsoleOutput"}]},{"file":"/srv/nextcloud-18/3rdparty/symfony/console/Application.php","line":1009,"function":"run","class":"Symfony\\Component\\Console\\Command\\Command","type":"->","args":[{"__class__":"Symfony\\Component\\Console\\Input\\ArgvInput"},{"__class__":"Symfony\\Component\\Console\\Output\\ConsoleOutput"}]},{"file":"/srv/nextcloud-18/3rdparty/symfony/console/Application.php","line":273,"function":"doRunCommand","class":"Symfony\\Component\\Console\\Application","type":"->","args":[{"__class__":"OC\\Core\\Command\\Maintenance\\Repair"},{"__class__":"Symfony\\Component\\Console\\Input\\ArgvInput"},{"__class__":"Symfony\\Component\\Console\\Output\\ConsoleOutput"}]},{"file":"/srv/nextcloud-18/3rdparty/symfony/console/Application.php","line":149,"function":"doRun","class":"Symfony\\Component\\Console\\Application","type":"->","args":[{"__class__":"Symfony\\Component\\Console\\Input\\ArgvInput"},{"__class__":"Symfony\\Component\\Console\\Output\\ConsoleOutput"}]},{"file":"/srv/nextcloud-18/lib/private/Console/Application.php","line":209,"function":"run","class":"Symfony\\Component\\Console\\Application","type":"->","args":[{"__class__":"Symfony\\Component\\Console\\Input\\ArgvInput"},{"__class__":"Symfony\\Component\\Console\\Output\\ConsoleOutput"}]},{"file":"/srv/nextcloud-18/console.php","line":99,"function":"run","class":"OC\\Console\\Application","type":"->","args":[]},{"file":"/srv/nextcloud-18/occ","line":11,"args":["/srv/nextcloud-18/console.php"],"function":"require_once"}],"File":"/srv/nextcloud-18/lib/private/Log/ErrorHandler.php","Line":92,"CustomMessage":"--"},"id":"624fe49cd7686"}
^^^ Note that this is a very small selection from the log. I’ve focussed on the most recent ones. I’m seeing quite a few errors from disc_free_space() but they seem to be all No such file or directory rather than an actual issue around free disc space.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'ocolokkavppu',
'passwordsalt' => 'REDACTED',
'secret' => 'REDACTED',
'trusted_domains' =>
array (
0 => 'fileserver.linaro.org',
1 => 'fileserver-ec2.linaro.org',
),
'datadirectory' => '/srv/nextcloud-data',
'overwrite.cli.url' => 'https://fileserver.linaro.org/',
'htaccess.RewriteBase' => '/',
'dbtype' => 'mysql',
'version' => '22.2.6.2',
'dbname' => 'owncloud',
'dbhost' => 'localhost',
'dbtableprefix' => 'oc_',
'dbuser' => 'REDACTED',
'dbpassword' => 'REDACTED',
'logtimezone' => 'UTC',
'installed' => true,
'ldapIgnoreNamingRules' => false,
'mail_smtpmode' => 'smtp',
'mail_smtphost' => '127.0.0.1',
'mail_from_address' => 'fileserver-dont-reply',
'mail_domain' => 'linaro.org',
'loglevel' => 3,
'lost_password_link' => '',
'mail_smtpport' => '25',
'theme' => '',
'maintenance' => false,
'updatechecker' => false,
'ldapProviderFactory' => '\\OCA\\User_LDAP\\LDAPProviderFactory',
'mysql.utf8mb4' => true,
'skeletondirectory' => '',
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
),
'data-fingerprint' => 'REDACTED',
'updater.secret' => 'REDACTED',
);
The Apache log is very “busy” with various activities going on. Happy to provide snippets if any are required, rather than the whole log.