So as i said below, my custom kernel is the problem, and i can't recompile one anymore on my rpi without getting errors, can't rpi-update to get a new kernel cause it's a custom one with 3G/1G split low memory 1G.
Do i missed something when compiling the kernel? anyways, i need to download a new kernel and apply it to my rpi.
(Kernel version before issue : 4.14.98)
