I've upgraded Moodle from Version 3.3 to 3.5 and now I recieve the error message "The operation timed out while waiting for a lock." when accessing any site of moodle.
For the upgrade I've followed the instructions of this article: https://docs.moodle.org/35/en/Upgrading
Befor upgrading the site which causes Problems, I've upgraded an other, similar site. No problem showed up on the other site.
I've already restored the Server ro re-run the upgrade. But I recieve the error "The operation timed out while waiting for a lock." again and can't access moodle at all.
The only further error message I've found is when I try to access https://my.moodle.site/admin/settings.php. On this page I can see the error message "Required parameter 'section' is missing" and "The operation timed out while waiting for a lock".
Any idea how to solve this error? I currently can't access moodle at all.