kernel BUG at /build/buildd/linux-2.6.31/include/linux/cred.h:207!
invalid opcode: 0000 [#2] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda1/stat
Modules linked in: tun aes_i586 aes_generic binfmt_misc ppdev vboxnetadp vboxnetflt vboxdrv snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy arc4 snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event iptable_filter ecb snd_seq ip_tables joydev iwl3945 snd_timer x_tables coretemp tuner_xc2028 iwlcore snd_seq_device sbp2 sdhci_pci mac80211 psmouse sdhci dell_wmi snd led_class serio_raw dell_laptop soundcore cfg80211 snd_page_alloc lp parport dcdbas dvb_usb_dib0700 dib7000p dib7000m dvb_usb dvb_core dib3000mc dibx000_common dib0070 video ohci1394 ieee1394 b44 ssb mii radeon output ttm drm i2c_algo_bit intel_agp agpgart

Pid: 26, comm: khubd Tainted: G      D    (2.6.31-14-generic #48-Ubuntu) MM061                           
EIP: 0060:[<c0144775>] EFLAGS: 00010286 CPU: 0
EIP is at __put_task_struct+0x75/0xb0
EAX: f37f4d80 EBX: f3588000 ECX: 00000000 EDX: f37f4600
ESI: 00000000 EDI: f66367ec EBP: f711dd98 ESP: f711dd94
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process khubd (pid: 26, ti=f711c000 task=f70bcb60 task.ti=f711c000)
Stack:
 f3588000 f711dda8 c015c007 f64cd000 f6b2c800 f711ddbc f80b20e5 c056f684
<0> f64cd000 f64cd000 f711dde8 f80b217f f711ddd0 c03a0312 f6434000 f711dde8
<0> c0433d2e 00000000 f6636000 f66367ec 00000001 f711ddf4 f80ebe55 f6636000
Call Trace:
 [<c015c007>] ? kthread_stop+0x67/0xa0
 [<f80b20e5>] ? dvb_frontend_stop+0x35/0xa0 [dvb_core]
 [<c056f684>] ? mutex_lock+0x14/0x40
 [<f80b217f>] ? dvb_unregister_frontend+0x2f/0xe0 [dvb_core]
 [<c03a0312>] ? device_unregister+0x12/0x20
 [<c0433d2e>] ? input_unregister_device+0xbe/0xe0
 [<f80ebe55>] ? dvb_usb_adapter_frontend_exit+0x15/0x30 [dvb_usb]
 [<f80eb3e9>] ? dvb_usb_exit+0x39/0xb0 [dvb_usb]
 [<f80eb48d>] ? dvb_usb_device_exit+0x2d/0x50 [dvb_usb]
 [<c04148c9>] ? usb_unbind_interface+0xe9/0x120
 [<c03a26de>] ? __device_release_driver+0x3e/0x90
 [<c03a27f0>] ? device_release_driver+0x20/0x40
 [<c03a1b33>] ? bus_remove_device+0x73/0x90
 [<c03a029f>] ? device_del+0xef/0x150
 [<c041172d>] ? usb_disable_device+0x7d/0xf0
 [<c040c37e>] ? usb_disconnect+0x9e/0x110
 [<c040c72c>] ? hub_port_connect_change+0x7c/0x830
 [<c0412400>] ? usb_control_msg+0xd0/0x120
 [<c0400100>] ? ppp_mp_reconstruct+0x210/0x2c0
 [<c040df95>] ? hub_events+0x1f5/0x500
 [<c056e97c>] ? schedule+0x40c/0x730
 [<c015c3da>] ? finish_wait+0x4a/0x70
 [<c040e2a0>] ? hub_thread+0x0/0x150
 [<c040e2d5>] ? hub_thread+0x35/0x150
 [<c015c280>] ? autoremove_wake_function+0x0/0x40
 [<c015bf8c>] ? kthread+0x7c/0x90
 [<c015bf10>] ? kthread+0x0/0x90
 [<c0104007>] ? kernel_thread_helper+0x7/0x10
Code: 7e 25 f0 ff 08 0f 94 c2 84 d2 74 05 e8 75 d9 01 00 89 d8 e8 8e f5 01 00 85 c0 75 07 89 d8 e8 63 f2 ff ff 5b 5d 90 c3 0f 0b eb fe <0f> 0b eb fe ba 99 00 00 00 b8 88 61 6a c0 e8 38 0a 00 00 eb 9b 
EIP: [<c0144775>] __put_task_struct+0x75/0xb0 SS:ESP 0068:f711dd94
---[ end trace 2c9682c5c3fd1898 ]---