[45883.065648] Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: 
[45883.065656] <ffffffff802ba0f0>{page_to_pfn+0}
[45883.065664] PGD 404d067 PUD 8160067 PMD 0 
[45883.065668] Oops: 0000 [1] SMP 
[45883.065670] CPU 0 
[45883.065672] Modules linked in: nvidia vmnet vmmon binfmt_misc rfcomm l2cap bluetooth powernow_k8 cpufreq_userspace cpufreq_stats freq_table cpufreq_powersave cpufreq_ondemand cpufreq_conservative video tc1100_wmi sony_acpi sbs pcc_acpi i2c_ec hotkey dev_acpi container button battery asus_acpi ac ext3 jbd ipv6 snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_seq_device lp af_packet tsdev i2c_core joydev sg evdev psmouse floppy snd_intel8x0 snd_ac97_codec snd_ac97_bus parport_pc parport serio_raw snd_pcm_oss snd_mixer_oss pcspkr snd_pcm snd_timer sis_agp snd soundcore snd_page_alloc sis900 mii shpchp pci_hotplug xfs usbhid ehci_hcd ohci_hcd usbcore ide_generic sd_mod sata_sis libata scsi_mod ide_cd cdrom ide_disk generic sis5513 thermal processor fan capability commoncap aes_x86_64 sha256 dm_crypt dm_mod vesafb cfbcopyarea cfbimgblt cfbfillrect fbcon tileblit font bitblit softcursor
[45883.065715] Pid: 20821, comm: pdflush Tainted: P      2.6.17-11-generic #2
[45883.065718] RIP: 0010:[<ffffffff802ba0f0>] <ffffffff802ba0f0>{page_to_pfn+0}
[45883.065724] RSP: 0018:ffff8100330dd740  EFLAGS: 00010246
[45883.065727] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[45883.065730] RDX: 0000000000000000 RSI: ffff81001f811800 RDI: 0000000000000000
[45883.065734] RBP: ffff81001f8117f0 R08: 0000000000000000 R09: ffff81001f811800
[45883.065737] R10: 0000000000000000 R11: 000000000000000a R12: ffff810000fd3f40
[45883.065740] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[45883.065745] FS:  00002ae9af484890(0000) GS:ffffffff805f3000(0000) knlGS:00000000f7db1a40
[45883.065748] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[45883.065751] CR2: 0000000000000000 CR3: 000000000404c000 CR4: 00000000000006e0
[45883.065756] Process pdflush (pid: 20821, threadinfo ffff8100330dc000, task ffff81003c51d890)
[45883.065758] Stack: ffffffff8022ffcc 00000001012e64f2 ffff81003d9e4048 ffff81003c51d890 
[45883.065765]        0000000000000040 0000000000fd3f40 0000000000000000 0000000100000001 
[45883.065770]        ffff81003b1cf9c0 ffff810000fd3f40 
[45883.065774] Call Trace: <ffffffff8022ffcc>{blk_recount_segments+140}
[45883.065792]        <ffffffff802d141e>{__bio_clone+126} <ffffffff802d149d>{bio_clone+61}
[45883.065804]        <ffffffff8803c944>{:dm_crypt:crypt_map+228} <ffffffff880283e6>{:dm_mod:__map_bio+86}
[45883.065845]        <ffffffff88028fb9>{:dm_mod:__split_bio+393} <ffffffff880299be>{:dm_mod:dm_request+286}
[45883.065881]        <ffffffff8021c6b0>{generic_make_request+368} <ffffffff80236048>{submit_bio+200}
[45883.065896]        <ffffffff8022eabe>{__bio_add_page+446} <ffffffff881906be>{:xfs:xfs_submit_ioend_bio+30}
[45883.065973]        <ffffffff881912a7>{:xfs:xfs_page_state_convert+3031}
[45883.066045]        <ffffffff881916a8>{:xfs:xfs_vm_writepage+184} <ffffffff8021d584>{mpage_writepages+468}
[45883.066095]        <ffffffff881978f5>{:xfs:xfs_bdstrat_cb+69} <ffffffff881915f0>{:xfs:xfs_vm_writepage+0}
[45883.066197]        <ffffffff80263d09>{do_writepages+41} <ffffffff802320cf>{__writeback_single_inode+495}
[45883.066208]        <ffffffff80232279>{__writeback_single_inode+921} <ffffffff8802ad85>{:dm_mod:dm_table_any_congested+21}
[45883.066232]        <ffffffff80221757>{sync_sb_inodes+487} <ffffffff80257b78>{writeback_inodes+152}
[45883.066249]        <ffffffff802bbaf2>{background_writeout+130} <ffffffff8025e390>{pdflush+0}
[45883.066267]        <ffffffff802a38d0>{keventd_create_kthread+0} <ffffffff8025e4d4>{pdflush+324}
[45883.066274]        <ffffffff802bba70>{background_writeout+0} <ffffffff80235479>{kthread+217}
[45883.066289]        <ffffffff80266662>{child_rip+8} <ffffffff802a38d0>{keventd_create_kthread+0}
[45883.066303]        <ffffffff802353a0>{kthread+0} <ffffffff8026665a>{child_rip+0}
[45883.066314] 
[45883.066315] Code: 48 8b 07 48 c1 e8 3a 48 8b 14 c5 40 d0 5f 80 48 b8 b7 6d db 
[45883.066324] RIP <ffffffff802ba0f0>{page_to_pfn+0} RSP <ffff8100330dd740>
[45883.066329] CR2: 0000000000000000
[45883.066331]