The latest RCPL (we can assume they refer to RCPL0008) appears to have picked up: [http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto/commit/drivers/net/tun.c?h=v4.18.40&id=cf652d77ac4506556a41063d4542482bcc49b200] This fix appears to have caused another issue where the kernel sees one less queue than what is configured. With this change tun_set_real_num_queues would be called before the number of queues is increased. This causes the kernel to see one less queue,