BUG: unable to handle kernel NULL pointer dereference at 00000020
IP: [<c10c5006>] iput+0x32/0x106
*pde = 00000000 
Oops: 0000 [#1] SMP 
Modules linked in: snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm 
snd_timer snd iwl3945 iwl_legacy snd_page_alloc dm_snapshot scsi_wait_scan

Pid: 604, comm: kswapd0 Not tainted 3.0.4-gentoo #3 Dell Inc. MM061                           /0XD720
EIP: 0060:[<c10c5006>] EFLAGS: 00010246 CPU: 1
EIP is at iput+0x32/0x106
EAX: 00000001 EBX: c003fd98 ECX: 00000001 EDX: 00000301
ESI: d9212280 EDI: 00000000 EBP: f5dd7e4c ESP: f5dd7e40
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
Process kswapd0 (pid: 604, ti=f5dd6000 task=f5e34a10 task.ti=f5dd6000)
Stack:
 c0039a80 d9212280 c003fd98 f5dd7e64 c10c21bf 00000000 c0039ae0 f5dd7e98
 c0039a80 f5dd7e80 c10c24fe f5dd7e74 c0039ae0 f551a600 c0039d00 c0039d60
 f5dd7eb4 c10c2654 f551a680 f5dd7ec8 00000008 00000000 c00385e0 c0039a60
Call Trace:
 [<c10c21bf>] dentry_kill+0xdc/0xf2
 [<c10c24fe>] shrink_dentry_list+0x53/0x92
 [<c10c2654>] __shrink_dcache_sb+0x117/0x127
 [<c10c272d>] shrink_dcache_memory+0xc9/0x133
 [<c1095de4>] shrink_slab+0xe8/0x144
 [<c1097946>] kswapd+0x46b/0x687
 [<c1046e2a>] ? wake_up_bit+0x1b/0x1b
 [<c10974db>] ? shrink_zone+0x3d2/0x3d2
 [<c1046b05>] kthread+0x62/0x67
 [<c1046aa3>] ? kthread_worker_fn+0x107/0x107
 [<c14d5c76>] kernel_thread_helper+0x6/0xd
Code: 53 89 c3 0f 84 f1 00 00 00 f6 40 1c 40 74 02 0f 0b 8d 50 14 8d 40 68 e8 6d 7c 11 00 85 c0 0f 84 d6 00 00 00 8b 7b 10 f6 43 1c 08 <8b> 77 20 74 0f ba 34 05 00 00 b8 2e 18 6a c1 e8 d1 c2 f6 ff 85 
EIP: [<c10c5006>] iput+0x32/0x106 SS:ESP 0068:f5dd7e40
CR2: 0000000000000020