Comment 2 for bug 387073

Still an issue with 2.6.31-5-generic

[ 2598.361308] BUG: unable to handle kernel NULL pointer dereference at 0000000000000220
[ 2598.361322] IP: [<ffffffff8112d4c0>] touch_atime+0x20/0x150
[ 2598.361340] PGD 127da0067 PUD 11c8d3067 PMD 0
[ 2598.361350] Oops: 0000 [#1] SMP
[ 2598.361358] last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda2/stat
[ 2598.361366] CPU 0
[ 2598.361371] Modules linked in: cbc cryptd aes_x86_64 aes_generic usb_storage binfmt_misc ppdev bridge stp bnep lp parport joydev snd_hda_codec_conexant arc4 ecb snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer i2400m_usb uvcvideo videodev v4l1_compat v4l2_compat_ioctl32 snd_seq_device i2400m iwlagn btusb iwlcore wimax mac80211 snd psmouse serio_raw soundcore cfg80211 snd_page_alloc pcspkr heci(C) thinkpad_acpi led_class nvram e1000e fbcon tileblit font bitblit softcursor i915 drm i2c_algo_bit video output intel_agp
[ 2598.361486] Pid: 4927, comm: mutt Tainted: G C 2.6.31-5-generic #24-Ubuntu 2777CTO
[ 2598.361492] RIP: 0010:[<ffffffff8112d4c0>] [<ffffffff8112d4c0>] touch_atime+0x20/0x150
[ 2598.361503] RSP: 0018:ffff8801028edd58 EFLAGS: 00010246
[ 2598.361509] RAX: 0000000000000000 RBX: ffff8801345d0200 RCX: 000000004a7abb90
[ 2598.361515] RDX: ffff880134c89800 RSI: ffff880110dede40 RDI: ffff8801345d0200
[ 2598.361521] RBP: ffff8801028edd88 R08: 0000000000000002 R09: ffffea0003ac7fa8
[ 2598.361527] R10: 0000000000000022 R11: 0000000000000001 R12: 0000000000000000
[ 2598.361533] R13: 00000000000005b1 R14: ffff8801028edf48 R15: 00007fffe8e16900
[ 2598.361540] FS: 00007fc3d8d5a710(0000) GS:ffff880028023000(0000) knlGS:0000000000000000
[ 2598.361546] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2598.361552] CR2: 0000000000000220 CR3: 0000000119c60000 CR4: 00000000000006b0
[ 2598.361558] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2598.361564] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 2598.361571] Process mutt (pid: 4927, threadinfo ffff8801028ec000, task ffff88011e274410)
[ 2598.361575] Stack:
[ 2598.361579] ffff880136094000 ffff8801028eddc8 ffff8800b56fa540 ffff8801028edeb8
[ 2598.361588] <0> ffff8801028eddc8 ffff8800b56fa540 ffff8801028eddb8 ffffffff811f0237
[ 2598.361599] <0> ffff8801028eddf8 ffff8801028eddc8 ffff8800b56fa540 ffff8801028edeb8
[ 2598.361610] Call Trace:
[ 2598.361623] [<ffffffff811f0237>] ecryptfs_read_update_atime+0x47/0x70
[ 2598.361633] [<ffffffff81118122>] do_sync_read+0xf2/0x130
[ 2598.361644] [<ffffffff81072da0>] ? autoremove_wake_function+0x0/0x40
[ 2598.361654] [<ffffffff812193a1>] ? security_file_permission+0x11/0x20
[ 2598.361662] [<ffffffff81118705>] vfs_read+0xb5/0x1a0
[ 2598.361670] [<ffffffff81118d0c>] sys_read+0x4c/0x80
[ 2598.361680] [<ffffffff81011fc2>] system_call_fastpath+0x16/0x1b
[ 2598.361685] Code: 66 66 2e 0f 1f 84 00 00 00 00 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 74 36 00 00 85 c0 75 13 <41> f6 84 24 20 02 00 00 02 74 15 48 89 df e8 8d 37 00 00 48 8b
[ 2598.361769] RIP [<ffffffff8112d4c0>] touch_atime+0x20/0x150
[ 2598.361778] RSP <ffff8801028edd58>
[ 2598.361782] CR2: 0000000000000220
[ 2598.361789] ---[ end trace f3b5484d5061cd8f ]---