[ 9539.423871] usb 2-3.5.2: USB disconnect, address 12
[ 9540.721027] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 9540.721032] IP: [<ffffffff815c1441>] mutex_lock+0x21/0x50
[ 9540.721040] PGD 25ea69067 PUD 269c46067 PMD 0
[ 9540.721043] Oops: 0002 [#1] SMP
[ 9540.721045] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
[ 9540.721047] CPU 1
[ 9540.721048] Modules linked in: snd_seq_dummy rfcomm binfmt_misc sco bnep l2cap vboxnetadp vboxnetflt vboxdrv hid_g110 hid_g13 hid_g19 hid_g15 hid_gfb fb_sys_fops sysimgblt sysfillrect syscopyarea nfs lockd fscache nfs_acl auth_rpcgss sunrpc parport_pc ppdev vesafb snd_hda_codec_hdmi snd_hda_codec_realtek uvcvideo videodev btusb snd_usb_audio bluetooth joydev snd_usbmidi_lib v4l2_compat_ioctl32 snd_seq_midi nvidia(P) snd_hda_intel snd_hda_codec snd_rawmidi snd_hwdep snd_seq_midi_event snd_seq snd_pcm psmouse serio_raw snd_timer snd_seq_device asus_atk0110 snd i7core_edac soundcore snd_page_alloc xhci_hcd edac_core lp parport hid_pl ff_memless usbhid hid r8169 firewire_ohci firewire_core crc_itu_t ahci libahci
[ 9540.721081]
[ 9540.721083] Pid: 16393, comm: python Tainted: P            2.6.38-8-generic #42-Ubuntu System manufacturer System Product Name/SABERTOOTH X58
[ 9540.721086] RIP: 0010:[<ffffffff815c1441>]  [<ffffffff815c1441>] mutex_lock+0x21/0x50
[ 9540.721089] RSP: 0018:ffff88025ec0dcd8  EFLAGS: 00010246
[ 9540.721091] RAX: 0000000000000000 RBX: 0000000000000010 RCX: 00007fd60e676800
[ 9540.721092] RDX: ffff88025ec0dfd8 RSI: 0000000000004602 RDI: 0000000000000010
[ 9540.721093] RBP: ffff88025ec0dce8 R08: ffffffff81321410 R09: 0000000000000000
[ 9540.721094] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010
[ 9540.721096] R13: 0000000000004602 R14: 00007fd60e676800 R15: 0000000003b9bbc8
[ 9540.721097] FS:  00007fd60e678700(0000) GS:ffff8800bf420000(0000) knlGS:0000000000000000
[ 9540.721099] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 9540.721100] CR2: 0000000000000010 CR3: 00000002f2300000 CR4: 00000000000006e0
[ 9540.721102] DR0: 000000003c952bb0 DR1: 000000003c971280 DR2: 000000003c9846b0
[ 9540.721103] DR3: 000000003c956cd0 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 9540.721105] Process python (pid: 16393, threadinfo ffff88025ec0c000, task ffff88025ed744a0)
[ 9540.721106] Stack:
[ 9540.721107]  0000000000000000 0000000000000010 ffff88025ec0dd08 ffffffff8131f585
[ 9540.721109]  0000000000000000 00007fd60e676800 ffff88025ec0dec8 ffffffff81320d25
[ 9540.721111]  ffff88025ec0dd68 ffffffff8112ca77 ffff88025ec0dd88 ffffea0008722780
[ 9540.721114] Call Trace:
[ 9540.721119]  [<ffffffff8131f585>] lock_fb_info+0x25/0x60
[ 9540.721121]  [<ffffffff81320d25>] do_fb_ioctl+0x195/0x5e0
[ 9540.721126]  [<ffffffff8112ca77>] ? do_anonymous_page.clone.40+0x117/0x310
[ 9540.721128]  [<ffffffff81130ac1>] ? handle_pte_fault+0x1f1/0x210
[ 9540.721132]  [<ffffffff8111561d>] ? __free_pages+0x2d/0x40
[ 9540.721133]  [<ffffffff8112de3f>] ? __pte_alloc+0xdf/0x100
[ 9540.721135]  [<ffffffff81131d4d>] ? handle_mm_fault+0x16d/0x250
[ 9540.721138]  [<ffffffff815c6af8>] ? do_page_fault+0x258/0x540
[ 9540.721142]  [<ffffffff8100a777>] ? __switch_to+0x157/0x2f0
[ 9540.721145]  [<ffffffff81321439>] fb_ioctl+0x29/0x30
[ 9540.721148]  [<ffffffff8117648f>] do_vfs_ioctl+0x8f/0x360
[ 9540.721150]  [<ffffffff815c059c>] ? schedule+0x3ec/0x760
[ 9540.721152]  [<ffffffff811767f1>] sys_ioctl+0x91/0xa0
[ 9540.721154]  [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b
[ 9540.721155] Code: c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 48 83 ec 10 48 89 1c 24 4c 89 64 24 08 0f 1f 44 00 00 48 89 fb e8 e2 f5 ff ff 48 89 df <f0> ff 0f 79 05 e8 b5 04 00 00 65 48 8b 04 25 88 cc 00 00 48 2d
[ 9540.721173] RIP  [<ffffffff815c1441>] mutex_lock+0x21/0x50
[ 9540.721175]  RSP <ffff88025ec0dcd8>
[ 9540.721176] CR2: 0000000000000010
[ 9540.721178] ---[ end trace e6bc87f79a6d4212 ]---