as i'm testing current LEDE trunk now with kernel 4.9.x  ...
I'm getting this errors in logs..

root@router.rocam.com:/root # logread -f
Sat Jul 22 14:20:36 2017 kern.err kernel: [  467.600000] 3g-4G: recursion detected
Sat Jul 22 14:20:46 2017 kern.err kernel: [  477.610000] 3g-4G: recursion detected
Sat Jul 22 14:20:56 2017 kern.err kernel: [  487.620000] 3g-4G: recursion detected
Sat Jul 22 14:21:06 2017 kern.err kernel: [  497.630000] 3g-4G: recursion detected
Sat Jul 22 14:21:16 2017 kern.err kernel: [  507.640000] 3g-4G: recursion detected

any idea what can be the reason for it ?
or any idea how to fix it ?

I'M using for 3g-4g ...
this packages install routine ...
#3g/4g + luci (https://wiki.openwrt.org/doc/recipes/3gdongle)
opkg install chat #--force-reinstall
opkg install comgt #--force-reinstall
opkg install luci-proto-3g #--force-reinstall
opkg install kmod-usb-serial #--force-reinstall
opkg install kmod-usb-serial-option #--force-reinstall
opkg install kmod-usb-serial-wwan #--force-reinstall #(mostly added now in current release or trunk)
#3ginfo package
opkg install http://dl.eko.one.pl/chaos_calmer/ar71x … 24_all.ipk
#opkg install http://dl.eko.one.pl/chaos_calmer/ar71x … 24_all.ipk --force-checksum --force-reinstall

doesn'T had problems on old 4.4 kernel ...
maybe an issue related on kernel ?

cu camel