BUG (sd_revalidate_disk): unable to handle kernel NULL pointer dereference at 0000000000000008

Kernel oops'd when I ran 'fdisk -l', then after the output, I removed the USB stick (it wasn't mounted).

Relevant dmesg output:
Jan 18 09:59:41 undacuvabrutha-X220 kernel: [10437.588138] usb 2-1.2: new high-speed USB device number 5 using ehci_hcd
Jan 18 09:59:41 undacuvabrutha-X220 kernel: [10437.683470] scsi7 : usb-storage 2-1.2:1.0
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.679789] scsi 7:0:0:0: Direct-Access IT1167B USB Flash Disk 0.00 PQ: 0 ANSI: 2
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.681134] sd 7:0:0:0: Attached scsi generic sg1 type 0
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.683696] sd 7:0:0:0: [sdb] 15760384 512-byte logical blocks: (8.06 GB/7.51 GiB)
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.686340] sd 7:0:0:0: [sdb] Write Protect is off
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.686353] sd 7:0:0:0: [sdb] Mode Sense: 00 00 00 00
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.687692] sd 7:0:0:0: [sdb] Asking for cache data failed
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.687701] sd 7:0:0:0: [sdb] Assuming drive cache: write through
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.690549] sd 7:0:0:0: [sdb] Asking for cache data failed
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.690581] sd 7:0:0:0: [sdb] Assuming drive cache: write through
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.692991] sdb: sdb1
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.695556] sd 7:0:0:0: [sdb] Asking for cache data failed
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.695564] sd 7:0:0:0: [sdb] Assuming drive cache: write through
Jan 18 09:59:42 undacuvabrutha-X220 kernel: [10438.695570] sd 7:0:0:0: [sdb] Attached SCSI removable disk
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.597275] usb 2-1.2: USB disconnect, device number 5
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.598615] scsi 7:0:0:0: killing request
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.599949] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.600121] IP: [<ffffffff814422c0>] sd_revalidate_disk+0x30/0x2a0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.600259] PGD 1f2c89067 PUD 1f2c8a067 PMD 0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.600368] Oops: 0000 [#1] SMP
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.600444] CPU 2
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.600484] Modules linked in: usb_storage veth ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_conexant usbhid hid joydev bnep rfcomm kvm_intel kvm binfmt_misc arc4 snd_hda_intel snd_hda_codec snd_hwdep psmouse serio_raw wacom snd_pcm iwlwifi thinkpad_acpi mac80211 snd_seq_midi snd_rawmidi cfg80211 snd_page_alloc snd_seq_midi_event snd_seq btusb bluetooth mei(C) i915 drm_kms_helper drm i2c_algo_bit snd_timer snd_seq_device snd soundcore nvram wmi mac_hid tpm_tis video coretemp lp parport sdhci_pci sdhci e1000e
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.602106]
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.602145] Pid: 1852, comm: udisks-daemon Tainted: G C 3.2.0-9-generic #16-Ubuntu LENOVO 4294CTO/4294CTO
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.602347] RIP: 0010:[<ffffffff814422c0>] [<ffffffff814422c0>] sd_revalidate_disk+0x30/0x2a0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.602510] RSP: 0018:ffff8801f7a57b08 EFLAGS: 00010246
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.602607] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88020c53f340
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.602735] RDX: 0000000000000005 RSI: 0000000000000002 RDI: ffff88020c5fb800
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.602860] RBP: ffff8801f7a57b28 R08: 0000000800000000 R09: 00000008ffffffff
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.602981] R10: 0000000000000000 R11: ffffc90000808000 R12: ffff88020c5fb800
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.603102] R13: 00000000ffffff85 R14: ffff880215429d58 R15: ffff88020c5fb800
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.603229] FS: 00007f7db44307c0(0000) GS:ffff88021e280000(0000) knlGS:0000000000000000
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.603361] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.603464] CR2: 0000000000000008 CR3: 00000001f2c88000 CR4: 00000000000406e0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.603589] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.603716] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.603842] Process udisks-daemon (pid: 1852, threadinfo ffff8801f7a56000, task ffff880210b55c40)
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.603998] Stack:
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604042] ffff880215429d40 ffff88020c5fb800 00000000ffffff85 ffff880215429d58
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604202] ffff8801f7a57ba8 ffffffff811e296a ffff88020c5fb80c ffff88020c5fb878
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604362] 00000000f7a57b68 ffff880215429d40 ffff88020c5fb400 ffff88020c5fb800
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604517] Call Trace:
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604576] [<ffffffff811e296a>] rescan_partitions+0xaa/0x300
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604656] [<ffffffff811ae97c>] __blkdev_get+0x2bc/0x420
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604683] [<ffffffff81189210>] ? __pollwait+0xf0/0xf0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604709] [<ffffffff811aeb3e>] blkdev_get+0x5e/0x1e0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604735] [<ffffffff811aed1d>] blkdev_open+0x5d/0x80
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604762] [<ffffffff81173f30>] __dentry_open+0x290/0x360
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604788] [<ffffffff811aecc0>] ? blkdev_get+0x1e0/0x1e0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604816] [<ffffffff8129a32c>] ? security_inode_permission+0x1c/0x30
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604846] [<ffffffff8117562d>] nameidata_to_filp+0xad/0xb0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604874] [<ffffffff811844f8>] do_last+0x3f8/0x730
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604898] [<ffffffff81185bd1>] path_openat+0xd1/0x3f0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604926] [<ffffffff81308a47>] ? kobject_put+0x27/0x60
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604952] [<ffffffff813edea7>] ? put_device+0x17/0x20
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.604978] [<ffffffff81186012>] do_filp_open+0x42/0xa0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.605005] [<ffffffff81314be1>] ? strncpy_from_user+0x31/0x40
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.605033] [<ffffffff8118136a>] ? do_getname+0x10a/0x180
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.605062] [<ffffffff81653e6e>] ? _raw_spin_lock+0xe/0x20
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.605089] [<ffffffff81193297>] ? alloc_fd+0xf7/0x150
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.606263] [<ffffffff8117571d>] do_sys_open+0xed/0x220
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.607425] [<ffffffff81175870>] sys_open+0x20/0x30
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.608597] [<ffffffff8165c3c2>] system_call_fastpath+0x16/0x1b
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.609703] Code: 83 ec 20 48 89 5d e0 4c 89 65 e8 4c 89 6d f0 4c 89 75 f8 66 66 66 66 90 8b 05 6d 82 ad 00 48 8b 9f 38 03 00 00 49 89 fc c1 e8 15 <4c> 8b 6b 08 83 e0 07 83 f8 03 0f 87 0d 02 00 00 41 8b 85 70 06
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.613569] RIP [<ffffffff814422c0>] sd_revalidate_disk+0x30/0x2a0
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.616656] RSP <ffff8801f7a57b08>
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.619559] CR2: 0000000000000008
Jan 18 10:00:58 undacuvabrutha-X220 kernel: [10514.690827] ---[ end trace d9e8a62efb84ee43 ]---
Jan 18 10:01:15 undacuvabrutha-X220 kernel: Kernel logging (proc) stopped.
(rebooted and ran 'ubuntu-bug linux')

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-9-generic 3.2.0-9.16
ProcVersionSignature: Ubuntu 3.2.0-9.16-generic 3.2.1
Uname: Linux 3.2.0-9-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.90-0ubuntu2
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: robbiew 1915 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xf2520000 irq 45'
   Mixer name : 'Intel CougarPoint HDMI'
   Components : 'HDA:14f1506e,17aa21db,00100002 HDA:80862805,80860101,00100000'
   Controls : 23
   Simple ctrls : 8
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
   Mixer name : 'ThinkPad EC (unknown)'
   Components : ''
   Controls : 1
   Simple ctrls : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Wed Jan 18 10:06:00 2012
HibernationDevice: RESUME=UUID=09cda1bb-fd76-41f6-8a49-cfeaae6d380f
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110705.1)
MachineType: LENOVO 4294CTO
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-9-generic root=UUID=f0c9e0e0-e3b1-450a-a592-75d05a586ac3 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-9-generic N/A
 linux-backports-modules-3.2.0-9-generic N/A
 linux-firmware 1.67
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: Upgraded to precise on 2011-12-23 (25 days ago)
dmi.bios.date: 07/01/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET49WW (1.19 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4294CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8DET49WW(1.19):bd07/01/2011:svnLENOVO:pn4294CTO:pvrThinkPadX220Tablet:rvnLENOVO:rn4294CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4294CTO
dmi.product.version: ThinkPad X220 Tablet
dmi.sys.vendor: LENOVO