I am pretty sure it's caused by the changes for 0004235.

None of my test installations is running at the moment. I saw similar errors and got also web server crashes.

@vboctor I found the following endless loop

auth_get_current_user_id
    access_denied
        auth_login_page
            auth_flags
                auth_get_current_user_id

Is there specific steps or configuration that trigger this error vs. not? I will look into it and see if I can reproduce.

I was able to reproduce this. It happens when anonymous access is disabled and attempting to access a bug. Working on a fix.

PR: https://github.com/mantisbt/mantisbt/pull/1096

@libregeek can you confirm that the latest changes fix also your memory size issue?

Yes, the issue is fixed.