e kernel NULL pointer dereference at (null)
IP: [<c012d31b>] kmap_atomic_prot+0x1b/0xf0
*pde = 3e689067 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:0f.0/host2/target2:0:0/2:0:0:0/block/sda/sda3/uevent
Modules linked in: aes_i586 aes_generic xts gf128mul dm_crypt xt_TCPMSS xt_tcpmss xt_tcpudp iptable_mangle pppoe pppox binfmt_misc snd_via82xx snd_via82xx_modem gameport snd_ac97_codec snd_pcm_oss ac97_bus snd_mixer_oss snd_mpu401_uart iptable_filter snd_pcm snd_seq_dummy ip_tables snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event x_tables snd_seq snd_timer psmouse snd_seq_device i2c_viapro serio_raw snd soundcore snd_page_alloc k8temp ppdev shpchp parport_pc lp parport radeon ttm drm amd64_agp i2c_algo_bit agpgart skge sata_via

Pid: 2204, comm: kcryptd Not tainted (2.6.31-14-generic #48-Ubuntu) System Product Name
EIP: 0060:[<c012d31b>] EFLAGS: 00010202 CPU: 0
EIP is at kmap_atomic_prot+0x1b/0xf0
EAX: 00000000 EBX: f19d6000 ECX: 00000163 EDX: 00000003
ESI: f19d6000 EDI: 00000000 EBP: f19d7d90 ESP: f19d7d80
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process kcryptd (pid: 2204, ti=f19d6000 task=f1c26480 task.ti=f19d6000)
Stack:
 fffff000 f19d7e4c f19d6000 00000000 f19d7d98 c012d3fe f19d7da8 c02ef0d2
<0> f19d7e3c 3e8287c0 f19d7dd4 c02f0ec8 00000000 00000000 00000000 00000007
<0> 00000000 00000010 f19d7e3c 00000007 f0d41e40 f19d7df8 c02f1131 c174b678
Call Trace:
 [<c012d3fe>] ? kmap_atomic+0xe/0x10
 [<c02ef0d2>] ? scatterwalk_map+0x32/0x50
 [<c02f0ec8>] ? blkcipher_walk_next+0x1c8/0x3c0
 [<c02f1131>] ? blkcipher_walk_first+0x71/0x170
 [<f816b710>] ? aes_encrypt+0x0/0x20 [aes_i586]
 [<c02f1287>] ? blkcipher_walk_virt+0x17/0x20
 [<f813b20b>] ? crypt+0x2b/0xf0 [xts]
 [<f816b710>] ? aes_encrypt+0x0/0x20 [aes_i586]
 [<f813b362>] ? encrypt+0x42/0x50 [xts]
 [<f816b710>] ? aes_encrypt+0x0/0x20 [aes_i586]
 [<f816b710>] ? aes_encrypt+0x0/0x20 [aes_i586]
 [<c02f07e8>] ? async_encrypt+0x38/0x50
 [<f80b7d61>] ? crypt_convert_block+0x181/0x1c0 [dm_crypt]
 [<f80b7e0b>] ? crypt_convert+0x6b/0xf0 [dm_crypt]
 [<f80b8086>] ? kcryptd_crypt_write_convert+0xb6/0x1d0 [dm_crypt]
 [<f80b8227>] ? kcryptd_crypt+0x87/0xa0 [dm_crypt]
 [<c056e97c>] ? schedule+0x40c/0x730
 [<c0157a7e>] ? run_workqueue+0x6e/0x140
 [<f80b81a0>] ? kcryptd_crypt+0x0/0xa0 [dm_crypt]
 [<c0157bd8>] ? worker_thread+0x88/0xe0
 [<c015c280>] ? autoremove_wake_function+0x0/0x40
 [<c0157b50>] ? worker_thread+0x0/0xe0
 [<c015bf8c>] ? kthread+0x7c/0x90
 [<c015bf10>] ? kthread+0x0/0x90
 [<c0104007>] ? kernel_thread_helper+0x7/0x10
Code: 8b 0d 04 80 82 c0 55 89 e5 e8 52 f9 ff ff 5d c3 55 89 e5 83 ec 10 89 5d f4 89 e3 81 e3 00 e0 ff ff 89 75 f8 89 7d fc 83 43 14 01 <8b> 18 c1 eb 1e 8d 1c 9b c1 e3 08 81 c3 00 49 78 c0 2b 9b ec 04 
EIP: [<c012d31b>] kmap_atomic_prot+0x1b/0xf0 SS:ESP 0068:f19d7d80
CR2: 0000000000000000
---[ end trace ab5526a2bd15a5cf ]---