BUG: unable to handle kernel NULL pointer dereference at 0000000000000228
IP: [<ffffffff80310aa0>] touch_atime+0x20/0x150
PGD 125430067 PUD 12549d067 PMD 0 
Oops: 0000 [#8] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/rfkill/rfkill1/state
CPU 0 
Modules linked in: cbc cryptd aes_x86_64 aes_generic binfmt_misc ppdev bridge stp bnep lp parport joydev snd_hda_codec_conexant snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss arc4 snd_pcm ecb snd_seq_dummy i2400m_usb i2400m snd_seq_oss wimax snd_seq_midi snd_rawmidi iwlagn snd_seq_midi_event iwlcore mac80211 snd_seq snd_timer snd_seq_device psmouse cfg80211 serio_raw uvcvideo videodev v4l1_compat v4l2_compat_ioctl32 snd pcspkr iTCO_wdt soundcore snd_page_alloc iTCO_vendor_support i915 heci(C) drm i2c_algo_bit intel_agp video output thinkpad_acpi led_class nvram btusb usb_storage e1000e fbcon tileblit font bitblit softcursor
Pid: 12935, comm: mutt Tainted: G      D  C 2.6.30-9-generic #10-Ubuntu 2777CTO
RIP: 0010:[<ffffffff80310aa0>]  [<ffffffff80310aa0>] touch_atime+0x20/0x150
RSP: 0018:ffff880125479d58  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff880138868f00 RCX: 000000004a355cd7
RDX: 0000000000000000 RSI: ffff88007c9abd80 RDI: ffff8800280331c0
RBP: ffff880125479d88 R08: 0000000000000002 R09: ffffe20003c5f9b0
R10: 0000000000000022 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000315 R14: ffff880125479f48 R15: 00007fffea9b5210
FS:  00007f1da894f710(0000) GS:ffff880028023000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000228 CR3: 0000000112039000 CR4: 00000000000006a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process mutt (pid: 12935, threadinfo ffff880125478000, task ffff88008c88c350)
Stack:
 ffff880085cc9040 ffff880125479dc8 ffff8800b4cd9600 ffff880125479eb8
 ffff880125479dc8 ffff8800b4cd9600 ffff880125479db8 ffffffff803c3837
 ffff880125479df8 ffff880125479dc8 ffff8800b4cd9600 ffff880125479eb8
Call Trace:
 [<ffffffff803c3837>] ecryptfs_read_update_atime+0x47/0x70
 [<ffffffff802fbbb2>] do_sync_read+0xf2/0x130
 [<ffffffff80268e90>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff8022f479>] ? default_spin_lock_flags+0x9/0x10
 [<ffffffff803ebdd1>] ? security_file_permission+0x11/0x20
 [<ffffffff802fbee5>] vfs_read+0xb5/0x180
 [<ffffffff802fc7ac>] sys_read+0x4c/0x80
 [<ffffffff80212042>] system_call_fastpath+0x16/0x1b
Code: 31 c9 e9 6d ff ff ff 0f 1f 40 00 55 48 89 e5 48 83 ec 30 48 89 5d f0 4c 89 65 f8 48 89 fb 4c 8b 66 10 e8 34 38 00 00 85 c0 75 13 <41> f6 84 24 28 02 00 00 02 74 15 48 89 df e8 ed 45 00 00 48 8b 
RIP  [<ffffffff80310aa0>] touch_atime+0x20/0x150
 RSP <ffff880125479d58>
CR2: 0000000000000228
---[ end trace 0e5907e1d6750ecc ]---