Nvidia-Beta drivers crash with Kernel 3.18.2

Question

After the upgrade to kernel 3.18.2 I recompiled the NVIDIA-Beta drivers to discover that crashes in the kernel.  Has anyone got any ideas on how to rectify this issue or have had similar problems?
Log is at the following link - http://pastebin.com/frfMi9qJ
And below is a tiny snippet
[ 15.933352] ------------[ cut here ]------------
[ 15.933363] WARNING: CPU: 0 PID: 663 at drivers/gpu/drm/drm_ioctl.c:143 drm_setversion+0x17e/0x190 [drm]()
[ 15.933393] No drm_driver.set_busid() implementation provided by nvidia_frontend_exit_module [nvidia]. Use drm_dev_set_unique() to set the unique name explicitly.
[ 15.933394] Modules linked in:
[ 15.933395] arc4 ecb md4 md5 hmac nls_utf8 cifs dns_resolver fscache tda18271 tda10048 cfg80211 rfkill snd_hda_codec_hdmi xpad ff_memless led_class mousedev joydev nvidia(PO) coretemp hwmon intel_rapl x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul saa7164(+) iTCO_wdt crc32_pclmul crc32c_intel iTCO_vendor_support ghash_clmulni_intel mxm_wmi evdev aesni_intel mac_hid tveeprom aes_x86_64 lrw dvb_core gf128mul alx glue_helper v4l2_common ablk_helper videodev cryptd drm psmouse tpm_tis media nuvoton_cir mdio tpm serio_raw rc_core battery video processor snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer mei_me snd i2c_i801 mei i2c_core soundcore lpc_ich shpchp wmi pcspkr button sch_fq_codel vboxdrv(O) sg ext4 crc16
[ 15.933420] mbcache jbd2 uvesafb hid_generic usbhid hid sr_mod cdrom sd_mod atkbd libps2 ahci libahci libata ehci_pci xhci_pci xhci_hcd ehci_hcd scsi_mod usbcore usb_common i8042 serio
[ 15.933429] CPU: 0 PID: 663 Comm: Xorg.bin Tainted: P O 3.18.2-2-ARCH #1
[ 15.933430] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z87 Killer, BIOS P1.00 09/16/2013
[ 15.933431] 0000000000000000 00000000aa63387f ffff8807eb967c98 ffffffff8154f134
[ 15.933432] 0000000000000000 ffff8807eb967cf0 ffff8807eb967cd8 ffffffff81072bc1
[ 15.933433] ffff8807eb967f1c ffff8807eb967df0 ffff8807eb990000 ffff8807f295a780
[ 15.933435] Call Trace:
[ 15.933439] [<ffffffff8154f134>] dump_stack+0x4e/0x71
[ 15.933442] [<ffffffff81072bc1>] warn_slowpath_common+0x81/0xa0
[ 15.933444] [<ffffffff81072c35>] warn_slowpath_fmt+0x55/0x70
[ 15.933449] [<ffffffffa03f037e>] drm_setversion+0x17e/0x190 [drm]
[ 15.933451] [<ffffffff811de6b2>] ? path_openat+0xc2/0x6e0
[ 15.933455] [<ffffffffa03efe0c>] drm_ioctl+0x2cc/0x680 [drm]
[ 15.933458] [<ffffffffa03f0200>] ? drm_noop+0x40/0x40 [drm]
[ 15.933460] [<ffffffff811dfd59>] ? do_filp_open+0x49/0xd0
[ 15.933462] [<ffffffff811e23e0>] do_vfs_ioctl+0x2d0/0x4b0
[ 15.933463] [<ffffffff811df196>] ? final_putname+0x26/0x50
[ 15.933465] [<ffffffff811e2641>] SyS_ioctl+0x81/0xa0
[ 15.933468] [<ffffffff81554ca9>] system_call_fastpath+0x12/0x17
[ 15.933469] ---[ end trace 1f206c9a64b932eb ]---
[ 17.257683] ------------[ cut here ]------------

Answer 1

ok, that worked.
but my x server will not start after downgrading linux kernel, nvidia and nvidia-utils. oO
looks like the known problem with the kernel and nvidia freeze. are there more packages that i have to downgrade?