Manually disable locking state:
put Nextcloud in maintenance mode: edit config/config.php and change this line:
‘maintenance’ => true,
Empty table oc_file_locks: Use tools such as phpmyadmin or connect directly to your database and run (the default table prefix is oc_, this prefix can be different or even empty):
DELETE FROM oc_file_locks WHERE 1
disable maintenance mode (undo first step).
Make sure your cron-jobs run properly (you admin page tells you when cron ran the last time): https://docs.nextcloud.org/server/13/admin_manual/configuration_server/background_jobs_configuration.html 866
Permanent solution (if it happens regularly):
On your own server: Use redis for this feature. It is faster and so far no problems have been reported. You can follow the instructions for memory-caching in the docs: https://docs.nextcloud.org/server/13/admin_manual/configuration_server/caching_configuration.html#id4 2.8k
Shared hosting (others who can’t install redis): You can disable the file locking, edit your configuration file config/config.php:
‘filelocking.enabled’ => false,
However, disabling is not a good solution. You can run into problems when several processes try to write to a file (especially online editors in the web-interface).”