crash data:

Aug  3 16:23:41 karmic kernel: [   20.814640] Pid: 2853, comm: Xorg Tainted: P           2.6.31-5-generic #24-Ubuntu 64577WU
Aug  3 16:23:41 karmic kernel: [   20.814641] RIP: 0010:[<0000000000000000>]  [<(null)>] (null)
Aug  3 16:23:41 karmic kernel: [   20.814644] RSP: 0018:ffff88012dc15d20  EFLAGS: 00010292
Aug  3 16:23:41 karmic kernel: [   20.814646] RAX: ffff88012f90e000 RBX: ffff88013604afa8 RCX: 0000000000000001
Aug  3 16:23:41 karmic kernel: [   20.814648] RDX: ffff8801344ce854 RSI: ffff88012f90e000 RDI: ffff8801347f1000
Aug  3 16:23:41 karmic kernel: [   20.814649] RBP: ffff88013604af60 R08: ffff8801347f1000 R09: 0000000000000246
Aug  3 16:23:41 karmic kernel: [   20.814651] R10: 0000000000000010 R11: 0000000000000000 R12: ffff8801344ce850
Aug  3 16:23:41 karmic kernel: [   20.814653] R13: ffff8801347f1000 R14: 00007fff61d1f670 R15: 0000000000000000
Aug  3 16:23:41 karmic kernel: [   20.814655] FS:  00007fab318166f0(0000) GS:ffff880028022000(0000) knlGS:0000000000000000
Aug  3 16:23:41 karmic kernel: [   20.814657] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Aug  3 16:23:41 karmic kernel: [   20.814659] CR2: 0000000000000000 CR3: 000000012f8d0000 CR4: 00000000000006b0
Aug  3 16:23:41 karmic kernel: [   20.814661] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug  3 16:23:41 karmic kernel: [   20.814663] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Aug  3 16:23:41 karmic kernel: [   20.814665] Process Xorg (pid: 2853, threadinfo ffff88012dc14000, task ffff88012f9ac410)
Aug  3 16:23:41 karmic kernel: [   20.814666] Stack:
Aug  3 16:23:41 karmic kernel: [   20.814667]  ffffffffa0185577 ffff88013604afa8 00000000c1d00001 000000000000000c
Aug  3 16:23:41 karmic kernel: [   20.814671] <0> 00007fff61d1f670 0000000000000110 ffffffffa01872da 0000000000000020
Aug  3 16:23:41 karmic kernel: [   20.814674] <0> ffffffffa05816d1 0000000000000110 ffffffffa05812d9 0000000000000110
Aug  3 16:23:41 karmic kernel: [   20.814678] Call Trace:
Aug  3 16:23:41 karmic kernel: [   20.814820]  [<ffffffffa0185577>] ? _nv007272rm+0xaa/0x314 [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.814889]  [<ffffffffa01872da>] ? _nv019651rm+0x16/0x1c [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.814999]  [<ffffffffa05816d1>] ? _nv003836rm+0x9/0xe [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.815115]  [<ffffffffa05812d9>] ? _nv003802rm+0x179/0x1c2 [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.815228]  [<ffffffffa0581616>] ? _nv003838rm+0x98/0x13e [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.815347]  [<ffffffffa04b523e>] ? _nv007070rm+0x19/0x25 [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.815457]  [<ffffffffa02c30a6>] ? _nv003698rm+0x576/0x5b4 [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.815576]  [<ffffffffa053a181>] ? rm_ioctl+0x2f/0x67 [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.815667]  [<ffffffffa0611aec>] ? nv_kern_ioctl+0x12c/0x450 [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.815672]  [<ffffffff81273e32>] ? copy_user_generic_string+0x32/0x40
Aug  3 16:23:41 karmic kernel: [   20.815762]  [<ffffffffa0611e4c>] ? nv_kern_unlocked_ioctl+0x1c/0x20 [nvidia]
Aug  3 16:23:41 karmic kernel: [   20.815766]  [<ffffffff811272bd>] ? vfs_ioctl+0x1d/0xa0
Aug  3 16:23:41 karmic kernel: [   20.815769]  [<ffffffff811278e9>] ? do_vfs_ioctl+0x79/0x370
Aug  3 16:23:41 karmic kernel: [   20.815771]  [<ffffffff81118705>] ? vfs_read+0xb5/0x1a0
Aug  3 16:23:41 karmic kernel: [   20.815774]  [<ffffffff81127c61>] ? sys_ioctl+0x81/0xa0
Aug  3 16:23:41 karmic kernel: [   20.815778]  [<ffffffff81011fc2>] ? system_call_fastpath+0x16/0x1b
Aug  3 16:23:41 karmic kernel: [   20.815779] Code:  Bad RIP value.
Aug  3 16:23:41 karmic kernel: [   20.815784] RIP  [<(null)>] (null)
Aug  3 16:23:41 karmic kernel: [   20.815786]  RSP <ffff88012dc15d20>
Aug  3 16:23:41 karmic kernel: [   20.815787] CR2: 0000000000000000