[  695.587633] BUG: unable to handle kernel NULL pointer dereference at 00000001
 [  695.587670] IP: [<f8fd536e>] nouveau_fence_update+0xe/0xe0 [nouveau]
 [  695.587705] *pde = 00000000 
 [  695.587718] Oops: 0000 [#1] PREEMPT SMP 
 [  695.587737] Modules linked in: fuse cryptd aes_i586 aes_generic btusb bluetooth usbhid hid uvcvideo videodev media joydev snd_hda_codec_idt arc4 b43 nouveau mac80211 cfg80211 
 [  695.588005] 
 [  695.588010] Pid: 1316, comm: gnome-shell Not tainted 3.0-ARCH #1 Dell Inc. Inspiron 1520                   /0KY768
 [  695.588172] EIP: 0060:[<f8fd536e>] EFLAGS: 00210292 CPU: 1
 [  695.588187] EIP is at nouveau_fence_update+0xe/0xe0 [nouveau]
 [  695.588195] EAX: 00000001 EBX: f4f516c0 ECX: f6202980 EDX: 00000001
 [  695.588204] ESI: 000f4240 EDI: f3915aa0 EBP: f3a3bcf4 ESP: f3a3bcdc
 [  695.588212]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
 [  695.588221] Process gnome-shell (pid: 1316, ti=f3a3a000 task=f3915aa0 task.ti=f3a3a000)
 [  695.588231] Stack:
 [  695.588236]  0abbe649 00000000 001e8480 f4f516c0 000f4240 f3915aa0 f3a3bd00 f8fd577f
 [  695.588261]  00000000 f3a3bd30 f8fd57d3 f3915aa0 019252c0 0001d317 00000000 f4f516c0
 [  695.588285]  000f4240 00000000 00000050 f4f516c0 f4a80000 f3a3bd70 f8fd5a11 00000000
 [  695.588310] Call Trace:
 [  695.588324]  [<f8fd577f>] __nouveau_fence_signalled+0x1f/0x30 [nouveau]
 [  695.588340]  [<f8fd57d3>] __nouveau_fence_wait+0x43/0xd0 [nouveau]
 [  695.588358]  [<f8fd5a11>] nouveau_fence_sync+0x1b1/0x830 [nouveau]
 [  695.588372]  [<c0131d4c>] ? __wake_up_sync_key+0x4c/0x60
 [  695.588389]  [<f8fd6615>] validate_list+0x165/0x2f0 [nouveau]
 [  695.588401]  [<f8e1b4a2>] ? ttm_bo_list_ref_sub+0x22/0x30 [ttm] 
 [  695.588417]  [<f8fd7032>] nouveau_gem_ioctl_pushbuf+0x492/0xfd0 [nouveau]
 [  695.588431]  [<c0406481>] ? inet_sock_destruct+0xa1/0x190
 [  695.588444]  [<f8bbcd90>] drm_ioctl+0x390/0x450 [drm] 
 [  695.588454]  [<c0406481>] ? inet_sock_destruct+0xa1/0x190
 [  695.588471]  [<f8fd6ba0>] ? nouveau_gem_ioctl_new+0x1b0/0x1b0 [nouveau]
 [  695.588485]  [<f8bbca00>] ? drm_copy_field+0x80/0x80 [drm] 
 [  695.588496]  [<c02293f6>] do_vfs_ioctl+0x86/0x580
 [  695.588506]  [<c021983c>] ? rw_verify_area+0x6c/0x120
 [  695.588516]  [<c016f171>] ? ktime_get_ts+0xe1/0x110
 [  695.588525]  [<c016f2ef>] ? getnstimeofday+0x4f/0x110
 [  695.588535]  [<c021aff6>] ? fget_light+0x76/0xe0
 [  695.588544]  [<c022995f>] sys_ioctl+0x6f/0x80
 [  695.588553]  [<c014ba62>] ? sys_gettimeofday+0x32/0x70
 [  695.588565]  [<c0454bdf>] sysenter_do_call+0x12/0x28
 [  695.588574]  [<c0406481>] ? inet_sock_destruct+0xa1/0x190
 [  695.588583]  [<c0406481>] ? inet_sock_destruct+0xa1/0x190
 [  695.588593]  [<c0450000>] ? rio_unlock_device+0x29/0x6f
 [  695.588601] Code: e8 98 e9 47 c7 89 d8 e8 a1 3a 23 c7 8b 5d f8 8b 75 fc 89 ec 5d c3 8d b4 26 00 00 00 00 55 89 e5 57 56 53 83 ec 0c 3e 8d 74 26 00 <8b> 18 89 c7 8d 40 40 89 45
 [  695.588749] EIP: [<f8fd536e>] nouveau_fence_update+0xe/0xe0 [nouveau] SS:ESP 0068:f3a3bcdc
 [  695.588770] CR2: 0000000000000001
 [  695.605712] ---[ end trace f6402cf594d68629 ]---