e to handle kernel NULL pointer dereference at 0000000000000020
IP: [<ffffffff8125575b>] decrypt_scatterlist+0x8b/0x110
PGD 399bb067 PUD 399b4067 PMD 0 
Oops: 0000 [#1] SMP 
CPU 1 
Modules linked in: nls_utf8 hfsplus ses enclosure usb_storage uas parport_pc ppdev dm_crypt bnep rfcomm bluetooth snd_hda_codec_analog joydev snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event pcmcia snd_seq psmouse serio_raw arc4 binfmt_misc snd_timer snd_seq_device yenta_socket pcmcia_rsrc pcmcia_core iwl3945 tpm_tis iwl_legacy thinkpad_acpi nvram mac80211 snd cfg80211 soundcore snd_page_alloc lp parport usbhid hid firewire_ohci firewire_core crc_itu_t wmi i915 drm_kms_helper drm ahci libahci e1000e i2c_algo_bit video

Pid: 17252, comm: banshee Not tainted 3.0.0-12-generic #19-Ubuntu LENOVO 7661E26/7661E26
RIP: 0010:[<ffffffff8125575b>]  [<ffffffff8125575b>] decrypt_scatterlist+0x8b/0x110
RSP: 0018:ffff8800355d5b08  EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000001000 RCX: 0000000000001000
RDX: ffff8800355d5b80 RSI: ffff8800355d5ba0 RDI: ffff8800355d5b10
RBP: ffff8800355d5b58 R08: 0000000002d0958f R09: 000000008f02d095
R10: 0000000000000028 R11: ffff88001f8f1cf8 R12: ffff8800355d5b80
R13: ffff88001f8eda88 R14: ffff88001f8edb78 R15: ffff8800355d5ba0
FS:  00007ff2b0ead760(0000) GS:ffff88013bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000020 CR3: 0000000038f8a000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process banshee (pid: 17252, threadinfo ffff8800355d4000, task ffff88013209c560)
Stack:
 0000000000000000 0000000000000000 ffff8800355d5bc0 0000000000000200
 0000000000020000 ffff88001f8eda88 ffffea00041aa090 0000000000000000
 ffffea0003c97190 0000000000000000 ffff8800355d5c08 ffffffff81255fa1
Call Trace:
 [<ffffffff81255fa1>] ecryptfs_decrypt_extent+0x121/0x2c0
 [<ffffffff81256b22>] ecryptfs_decrypt_page+0xc2/0x1a0
 [<ffffffff81254498>] ecryptfs_readpage+0xd8/0x120
 [<ffffffff8110adbd>] do_generic_file_read.constprop.36+0x10d/0x440
 [<ffffffff8110bee0>] generic_file_aio_read+0x120/0x290
 [<ffffffff815e9efe>] ? _raw_spin_lock+0xe/0x20
 [<ffffffff81250dbc>] ecryptfs_read_update_atime+0x1c/0x60
 [<ffffffff81167172>] do_sync_read+0xd2/0x110
 [<ffffffff81282d43>] ? security_file_permission+0x93/0xb0
 [<ffffffff811674b1>] ? rw_verify_area+0x61/0xf0
 [<ffffffff81167990>] vfs_read+0xb0/0x180
 [<ffffffff81167aaa>] sys_read+0x4a/0x90
 [<ffffffff815f22c2>] system_call_fastpath+0x16/0x1b
Code: 85 c0 75 7c 31 c0 89 da 48 c7 c6 a0 9b 62 81 48 c7 c7 e0 ca 7f 81 e8 85 dc ff ff 48 8b 45 b8 4c 89 e2 89 d9 4c 89 fe 48 8d 7d b8 <ff> 50 20 4c 89 f7 41 89 c4 e8 47 32 39 00 45 85 e4 75 22 41 89 
RIP  [<ffffffff8125575b>] decrypt_scatterlist+0x8b/0x110
 RSP <ffff8800355d5b08>
CR2: 0000000000000020
---[ end trace c710c282b8b698e8 ]---