Not sure if this should be a bugreport, but it seems something is misconfigured in ulogd or the kernel by default.
I've tried installing ulogd and running it as per default configuration, it throws this warning:
WARNING: scheduler configuration failed: Function not implemented
Here's some references I found
https://git.netfilter.org/ulogd2/commit/?id=10a85d467da4e045fbc754489dfcdd8c097ed44e
https://git.netfilter.org/ulogd2/tree/src/ulogd.c?id=10a85d467da4e045fbc754489dfcdd8c097ed44e#n1399
Further info
https://bugzilla.kernel.org/show_bug.cgi?id=16011
https://www.man7.org/linux/man-pages/man2/sched_setscheduler.2.html
https://bugzilla.kernel.org/show_bug.cgi?id=16011
In another blog someone suggested to modprobe
modprobe nf_conntrack_ipv4
modprobe nf_conntrack_ipv6
Both of these modules seem merged into main modules in later versions of the kernel as it does not appear in config for recent kernels, nor does sched_rr or similar seem like they need to be loaded via modules
I've also tried installing
kmod-ipt-conntrack-extra kmod-sched kmod-crypto-hash kmod-crypto-crc32 kmod-lib-crc32c kmod-sched-core
Not sure if those modules would be autoloaded, but it clearly seems like something is missing.
Does anyone have a clue? Should I just ignore this warning? Does OpenWrt kernel or base system lack sched_setscheduler or sched_rr in particular ?