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[ 3290.868237] sd 11:0:0:0: [sdb] 7683072 512-byte logical blocks: (3.93 GB/3.66 GiB)
[ 3290.869216] sd 11:0:0:0: [sdb] Write Protect is off
[ 3290.869238] sd 11:0:0:0: [sdb] Mode Sense: 0b 00 00 08
[ 3290.869877] sd 11:0:0:0: [sdb] No Caching mode page present
[ 3290.869898] sd 11:0:0:0: [sdb] Assuming drive cache: write through
[ 3290.876261] sd 11:0:0:1: Attached scsi generic sg2 type 0
[ 3290.905457] sd 11:0:0:0: [sdb] No Caching mode page present
[ 3290.905468] sd 11:0:0:0: [sdb] Assuming drive cache: write through
[ 3290.906201] sd 11:0:0:1: [sdc] Attached SCSI removable disk
[ 3290.908679]  sdb:
[ 3321.936246] usb 1-2: reset high-speed USB device number 10 using ehci_hcd
[ 3337.048247] usb 1-2: device descriptor read/64, error -110
[ 3352.264258] usb 1-2: device descriptor read/64, error -110
[ 3352.480163] usb 1-2: reset high-speed USB device number 10 using ehci_hcd
[ 3367.592138] usb 1-2: device descriptor read/64, error -110
[ 3382.808199] usb 1-2: device descriptor read/64, error -110
[ 3383.024163] usb 1-2: reset high-speed USB device number 10 using ehci_hcd
[ 3393.432113] usb 1-2: device not accepting address 10, error -110
[ 3393.544100] usb 1-2: reset high-speed USB device number 10 using ehci_hcd
[ 3403.952105] usb 1-2: device not accepting address 10, error -110
[ 3403.952184] usb 1-2: USB disconnect, device number 10
[ 3403.952300] sd 11:0:0:1: Device offlined - not ready after error recovery
[ 3403.952948] sd 11:0:0:0: [sdb] Attached SCSI removable disk
[ 3403.971062] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[ 3403.971240] IP: [<ffffffff8143fae0>] sd_revalidate_disk+0x30/0x2a0
[ 3403.971380] PGD 2956f067 PUD 35075067 PMD 0 
[ 3403.971486] Oops: 0000 [#1] SMP 
[ 3403.971559] CPU 0 
[ 3403.971601] Modules linked in: nls_iso8859_1 nls_cp437 vfat fat usb_storage uas bnep rfcomm bluetooth parport_pc ppdev lp parport binfmt_misc dm_crypt bcma arc4 joydev acer_wmi sparse_keymap snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event brcmsmac snd_seq snd_timer uvcvideo snd_seq_device videodev v4l2_compat_ioctl32 mac80211 psmouse brcmutil cfg80211 serio_raw snd crc8 soundcore cordic snd_page_alloc coretemp i915 drm_kms_helper drm wmi atl1c i2c_algo_bit video
[ 3403.972020] 
[ 3403.972020] Pid: 15543, comm: blkid Not tainted 3.2.0-5-generic #11-Ubuntu eMachines eM350/eM350
[ 3403.972020] RIP: 0010:[<ffffffff8143fae0>]  [<ffffffff8143fae0>] sd_revalidate_disk+0x30/0x2a0
[ 3403.972020] RSP: 0018:ffff8800350ffb08  EFLAGS: 00010246
[ 3403.972020] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8800295c8380
[ 3403.972020] RDX: 0000000000000002 RSI: 0000000000000001 RDI: ffff88000b7ffc00
[ 3403.972020] RBP: ffff8800350ffb28 R08: 0000000800000000 R09: 00000008ffffffff
[ 3403.972020] R10: 000003188c6c8b4c R11: ffffc90000203000 R12: ffff88000b7ffc00
[ 3403.972020] R13: 00000000ffffff85 R14: ffff880009748018 R15: ffff88000b7ffc00
[ 3403.972020] FS:  00007f84d7cb9760(0000) GS:ffff88007f200000(0000) knlGS:0000000000000000
[ 3403.972020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3403.972020] CR2: 0000000000000008 CR3: 000000003648d000 CR4: 00000000000006f0
[ 3403.972020] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3403.972020] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 3403.972020] Process blkid (pid: 15543, threadinfo ffff8800350fe000, task ffff8800351e8000)
[ 3403.972020] Stack:
[ 3403.972020]  ffff880009748000 ffff88000b7ffc00 00000000ffffff85 ffff880009748018
[ 3403.972020]  ffff8800350ffba8 ffffffff811e274a ffff88000b7ffc0c ffff88000b7ffc78
[ 3403.972020]  00000000350ffb68 ffff880009748000 ffff88000b7fe400 ffff88000b7ffc00
[ 3403.972020] Call Trace:
[ 3403.972020]  [<ffffffff811e274a>] rescan_partitions+0xaa/0x300
[ 3403.972020]  [<ffffffff811ae72c>] __blkdev_get+0x2bc/0x420
[ 3404.021551]  [<ffffffff811ae8ee>] blkdev_get+0x5e/0x1e0
[ 3404.021551]  [<ffffffff811aeacd>] blkdev_open+0x5d/0x80
[ 3404.021551]  [<ffffffff81173ee0>] __dentry_open+0x290/0x360
[ 3404.021551]  [<ffffffff811aea70>] ? blkdev_get+0x1e0/0x1e0
[ 3404.021551]  [<ffffffff81299fdc>] ? security_inode_permission+0x1c/0x30
[ 3404.021551]  [<ffffffff811755dd>] nameidata_to_filp+0xad/0xb0
[ 3404.021551]  [<ffffffff811843b8>] do_last+0x3f8/0x730
[ 3404.021551]  [<ffffffff81185a91>] path_openat+0xd1/0x3f0
[ 3404.021551]  [<ffffffff81139b19>] ? __pte_alloc+0xa9/0x160
[ 3404.021551]  [<ffffffff81185ed2>] do_filp_open+0x42/0xa0
[ 3404.021551]  [<ffffffff813147d1>] ? strncpy_from_user+0x31/0x40
[ 3404.021551]  [<ffffffff8118122a>] ? do_getname+0x10a/0x180
[ 3404.021551]  [<ffffffff81651a1e>] ? _raw_spin_lock+0xe/0x20
[ 3404.021551]  [<ffffffff81193157>] ? alloc_fd+0xf7/0x150
[ 3404.021551]  [<ffffffff811756cd>] do_sys_open+0xed/0x220
[ 3404.021551]  [<ffffffff81175820>] sys_open+0x20/0x30
[ 3404.021551]  [<ffffffff81659f42>] system_call_fastpath+0x16/0x1b
[ 3404.021551] 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 0d 8a 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 
[ 3404.021551] RIP  [<ffffffff8143fae0>] sd_revalidate_disk+0x30/0x2a0
[ 3404.021551]  RSP <ffff8800350ffb08>
[ 3404.021551] CR2: 0000000000000008
[ 3404.120635] ---[ end trace fb9c54eecb18eebe ]---
[ 3404.144164] usb 1-2: new high-speed USB device number 11 using ehci_hcd
[ 3409.760340] hub 1-0:1.0: unable to enumerate USB device on port 2