BUG: unable to handle kernel NULL pointer dereference at 00000040
IP: [<c0482454>] aa_cred_policy+0x14/0x30
*pde = de6d4067 
Oops: 0000 [#2] SMP 
last sysfs file: /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0/charge_full
Modules linked in: nvidia(P) hidp ipt_LOG xt_limit xt_tcpudp xt_state ipt_addrtype ip6table_filter ip6_tables nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp nf_conntrack ppdev bnep vboxnetflt vboxnetadp binfmt_misc bridge stp sha256_generic aes_i586 aes_generic cbc tun em28xx_dvb snd_hda_codec_idt dvb_core snd_hda_intel snd_hda_codec em28xx ir_common snd_hwdep v4l2_common snd_pcm_oss snd_mixer_oss videodev v4l1_compat videobuf_vmalloc arc4 ecb videobuf_core tveeprom snd_pcm snd_seq_dummy snd_seq_oss iwlagn vboxdrv snd_seq_midi iptable_filter snd_rawmidi iwlcore sbp2 ip_tables snd_seq_midi_event x_tables snd_seq led_class lp joydev parport pcmcia mac80211 snd_timer dm_crypt dell_wmi snd_seq_device cfg80211 snd psmouse btusb serio_raw dell_laptop dcdbas yenta_socket soundcore rsrc_nonstatic snd_page_alloc pcmcia_core ohci1394 ieee1394 video output tg3 intel_agp agpgart

Pid: 3563, comm: qmgr Tainted: P      D    (2.6.31-14-generic #48-Ubuntu) Latitude D830                   
EIP: 0060:[<c0482454>] EFLAGS: 00210246 CPU: 0
EIP is at aa_cred_policy+0x14/0x30
EAX: 00000000 EBX: f65ebe68 ECX: c077c580 EDX: 00000000
ESI: f3547a2c EDI: f684ba80 EBP: f65ebe50 ESP: f65ebe4c
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process qmgr (pid: 3563, ti=f65ea000 task=f670bed0 task.ti=f65ea000)
Stack:
 f5ed0c00 f65ebe78 c0486f76 f1f2f000 f65ebe74 c01fd88a f65ebe74 f65ebe70
<0> f5ed0c00 f3547a2c f684ba80 f65ebe80 c02c7c3f f65ebe9c c01e5750 ee1b9e58
<0> f3547a2c ee1b9e58 f5ed0c00 f65ebef0 f65ebeb8 c01e59c5 f5ed0c00 00000000
Call Trace:
 [<c0486f76>] ? apparmor_dentry_open+0x46/0x100
 [<c01fd88a>] ? mntput_no_expire+0x1a/0xd0
 [<c02c7c3f>] ? security_dentry_open+0xf/0x20
 [<c01e5750>] ? __dentry_open+0xa0/0x230
 [<c01e59c5>] ? nameidata_to_filp+0x55/0x70
 [<c01f34fa>] ? do_filp_open+0x53a/0x890
 [<c048becf>] ? sock_poll+0xf/0x20
 [<c0127c38>] ? default_spin_lock_flags+0x8/0x10
 [<c021705a>] ? ep_scan_ready_list+0x13a/0x150
 [<c01e5500>] ? do_sys_open+0x50/0x150
 [<c01e5669>] ? sys_open+0x29/0x40
 [<c010336c>] ? syscall_call+0x7/0xb
Code: c0 89 d8 e8 ef 16 d0 ff 8b 5d f8 8b 75 fc 89 ec 5d c3 90 90 90 90 90 55 89 e5 53 8b 40 58 89 d3 85 c0 74 19 8b 00 e8 6c 20 00 00 <8b> 50 40 83 e2 02 83 fa 01 19 d2 21 d0 89 03 5b 5d c3 0f 0b eb 
EIP: [<c0482454>] aa_cred_policy+0x14/0x30 SS:ESP 0068:f65ebe4c
CR2: 0000000000000040
---[ end trace 6ddd3685c5266fd1 ]---