r0 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1)
ioctl$sock_SIOCGIFCONF(r0, 0x8912, &(0x7f0000000180)=@req={0x28, &(0x7f00000000c0)={'ip_vti0\x00', @ifru_mtu}})