Turris Omnia - rtrom01
Turris OS 3.9.6
Kernel 4.4.119-082ea0f4a4e204b99821bedcb349ed54-0
having set option log_file '/data/log/system.log'
in /etc/config/system
does not produce a single byte there.
/data is a mount point (exf4 partition) of an msata (sda) drive mounted inside the router.
There are various other log files in the same directory and being written too just fine. File is owned by root with rw-r–r-- (0644) permission.