Hi everyone,

I am encountering a problem whenever updating my website's SSL certificate and then restarting Nginx (I use nginx -s quit for stopping Nginx). After Nginx is restarted, it continues processing incoming requests as normal. However, after a few hours (10-12 hours), it stops processing requests. The process id(s) of all Nginx processes after the restart and when the issue happens are the same, which indicates there is no process exiting or crashing suddenly. When this happens, I see the following error message:

ignore long locked inactive cache entry

Does anyone know what might cause this issue? I am wondering why Nginx only stops processing requests after a few hours from the restart? Thank you very much.