### Description related with #17817 repro: https://3v4l.org/AEfvC Currently, it is not possible to set `error_log` ini config to a non-FS path. When error log needs to be asserted in an app, real tmp file needs to be created. This is slow and RW FS is required. I would be happy if VFS/custom stream wrapper could be supported in `error_log`.