kernel: [11204.772898] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
kernel: [11204.772950] IP: [<ffffffffa03e9c3d>] radeon_fence_ref+0xd/0x50 [radeon]
kernel: [11204.773017] PGD 0 
kernel: [11204.773030] Oops: 0002 [#1] SMP 
kernel: [11204.773051] Modules linked in: bnep bluetooth 6lowpan_iphc uinput nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc ctr ccm nls_utf8 nls_cp437 vfat fat lp arc4 kvm_amd kvm rt2800pci hp_wmi ppdev rt2800mmio sparse_keymap crc32_pclmul rt2800lib rt2x00pci rt2x00mmio rt2x00lib eeprom_93cx6 mac80211 efi_pstore aesni_intel cfg80211 crc_ccitt aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media pcspkr serio_raw joydev i2c_piix4 evdev efivars k10temp rfkill radeon sg parport_pc wmi hp_accel ttm drm_kms_helper snd_hda_codec_hdmi lis3lv02d drm snd_hda_intel snd_hda_controller input_polldev snd_hda_codec snd_hwdep snd_pcm snd_timer i2c_algo_bit i2c_core snd parport hp_wireless video soundcore shpchp ac battery button acpi_cpufreq processor ext4 crc16 mbcache jbd2 dm_mod hid_generic usbhid hid sr_mod sd_mod crc_t10dif cdrom crct10dif_generic ohci_pci crct10dif_pclmul crct10dif_common crc32c_intel psmouse ehci_pci ohci_hcd ehci_hcd ahci libahci libata scsi_mod xhci_hcd usbcore usb_common thermal thermal_sys r8169 mii
kernel: [11204.773682] CPU: 0 PID: 1982 Comm: Xorg Not tainted 3.16.0-4-amd64 #1 Debian 3.16.7-ckt25-1
kernel: [11204.773721] Hardware name: Hewlett-Packard HP ProBook 455 G1/194E, BIOS 68CPE Ver. F.02 04/26/2013
kernel: [11204.773763] task: ffff880086300390 ti: ffff88008cb34000 task.ti: ffff88008cb34000
kernel: [11204.773798] RIP: 0010:[<ffffffffa03e9c3d>]  [<ffffffffa03e9c3d>] radeon_fence_ref+0xd/0x50 [radeon]
kernel: [11204.773854] RSP: 0018:ffff88008cb37b18  EFLAGS: 00010292
kernel: [11204.773879] RAX: 0000000000000000 RBX: ffff8800861c55f8 RCX: ffff8800861c4d08
kernel: [11204.773912] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
kernel: [11204.773945] RBP: ffff8800861c5550 R08: ffff8800861c4000 R09: 0000000000000000
kernel: [11204.773978] R10: 0000000000000002 R11: ffff88008cb37e08 R12: 0000000000000020
kernel: [11204.774011] R13: ffff88008cb37be0 R14: ffff88008cb37bb0 R15: ffff8800861c55f8
kernel: [11204.774047] FS:  00007f5890cb1980(0000) GS:ffff88013ec00000(0000) knlGS:0000000000000000
kernel: [11204.774087] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: [11204.774115] CR2: 0000000000000008 CR3: 000000008bc5a000 CR4: 00000000000407f0
kernel: [11204.774148] Stack:
kernel: [11204.774158]  ffffffffa044a0bc 0020000000044560 0000f02000000100 ffff88008cb37cd0
kernel: [11204.774199]  ffff8800861c4000 ffff880086300390 ffff880086300390 0000000000000001
kernel: [11204.774238]  0000000000000000 0000000000000000 0000000000000000 0000000000000000
kernel: [11204.774278] Call Trace:
kernel: [11204.774311]  [<ffffffffa044a0bc>] ? radeon_sa_bo_new+0x25c/0x460 [radeon]
kernel: [11204.774360]  [<ffffffffa03fef3e>] ? radeon_ib_get+0x2e/0xd0 [radeon]
kernel: [11204.774406]  [<ffffffffa040147c>] ? radeon_cs_ioctl+0x13c/0x730 [radeon]
kernel: [11204.774451]  [<ffffffffa03288b7>] ? drm_ioctl+0x1c7/0x5b0 [drm]
kernel: [11204.774486]  [<ffffffff81057311>] ? __do_page_fault+0x1d1/0x4f0
kernel: [11204.774527]  [<ffffffffa03ce046>] ? radeon_drm_ioctl+0x46/0x80 [radeon]
kernel: [11204.774561]  [<ffffffff811bacdf>] ? do_vfs_ioctl+0x2cf/0x4b0
kernel: [11204.774590]  [<ffffffff811baf41>] ? SyS_ioctl+0x81/0xa0
kernel: [11204.774617]  [<ffffffff81514a0d>] ? system_call_fast_compare_end+0x10/0x15
kernel: [11204.774649] Code: e4 48 8b 3b 89 c1 89 ea 48 c7 c6 80 96 4d a0 31 c0 e8 68 77 fb e0 eb cb 66 0f 1f 44 00 00 66 66 66 66 90 48 89 f8 ba 01 00 00 00 <f0> 0f c1 57 08 83 c2 01 83 fa 01 7e 01 c3 80 3d 0e 43 11 00 00 
kernel: [11204.774837] RIP  [<ffffffffa03e9c3d>] radeon_fence_ref+0xd/0x50 [radeon]
kernel: [11204.774882]  RSP <ffff88008cb37b18>
kernel: [11204.774899] CR2: 0000000000000008
kernel: [11204.780836] ---[ end trace f8ec848dd350e268 ]---