[  382.513642] usb 7-6: new high speed USB device using ehci_hcd and address 3
[  382.651247] usb 7-6: configuration #1 chosen from 1 choice
[  382.652359] scsi7 : SCSI emulation for USB Mass Storage devices
[  382.652543] usb-storage: device found at 3
[  382.652546] usb-storage: waiting for device to settle before scanning
[  387.640900] usb-storage: device scan complete
[  388.232674] scsi 7:0:0:0: Direct-Access     Generic                   6000 PQ: 0 ANSI: 0 CCS
[  388.235267] sd 7:0:0:0: [sdb] 121088 512-byte hardware sectors (62 MB)
[  388.235895] sd 7:0:0:0: [sdb] Write Protect is off
[  388.235899] sd 7:0:0:0: [sdb] Mode Sense: 4b 00 00 08
[  388.235902] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[  388.238007] sd 7:0:0:0: [sdb] 121088 512-byte hardware sectors (62 MB)
[  388.238632] sd 7:0:0:0: [sdb] Write Protect is off
[  388.238636] sd 7:0:0:0: [sdb] Mode Sense: 4b 00 00 08
[  388.238637] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[  388.238640]  sdb:end_request: I/O error, dev sdb, sector 0
[  388.367820] Buffer I/O error on device sdb, logical block 0
[  411.872158] usb 7-6: usbfs: USBDEVFS_CONTROL failed cmd lsusb rqt 128 rq 6 len 255 ret -110
[  412.869656] usb 7-6: usbfs: USBDEVFS_CONTROL failed cmd lsusb rqt 128 rq 6 len 255 ret -110
[  413.867158] usb 7-6: usbfs: USBDEVFS_CONTROL failed cmd lsusb rqt 128 rq 6 len 255 ret -110
[  418.411688] usb 7-6: reset high speed USB device using ehci_hcd and address 3
[  433.485898] usb 7-6: device descriptor read/64, error -110
[  448.667849] usb 7-6: device descriptor read/64, error -110
[  448.883309] usb 7-6: reset high speed USB device using ehci_hcd and address 3
[  463.957529] usb 7-6: device descriptor read/64, error -110
[  479.135489] usb 7-6: device descriptor read/64, error -110
[  479.350950] usb 7-6: reset high speed USB device using ehci_hcd and address 3
[  489.732917] usb 7-6: device not accepting address 3, error -110
[  489.844642] usb 7-6: reset high speed USB device using ehci_hcd and address 3
[  500.226617] usb 7-6: device not accepting address 3, error -110
[  500.226651] usb 7-6: USB disconnect, address 3
[  500.226789] Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: 
[  500.226792]  [<ffffffff80325bf2>] strlen+0x2/0x20
[  500.226802] PGD 1a9b4067 PUD 1a9b3067 PMD 0 
[  500.226806] Oops: 0000 [1] SMP 
[  500.226809] CPU 0 
[  500.226811] Modules linked in: i915 drm rfcomm l2cap bluetooth capability ppdev parport_pc lp parport cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_ondemand freq_table cpufreq_conservative video sbs container button dock ac fuse ipv6 snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_hwdep snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device psmouse serio_raw pcspkr snd iTCO_wdt iTCO_vendor_support soundcore intel_agp af_packet evdev battery squashfs loop unionfs nls_cp437 isofs sr_mod cdrom ext3 jbd mbcache sg sd_mod usbhid hid usb_storage ide_core libusual ohci1394 ieee1394 ahci libata scsi_mod ehci_hcd uhci_hcd usbcore e1000 thermal processor fan apparmor commoncap aamatch_pcre
[  500.226858] Pid: 2059, comm: khubd Not tainted 2.6.22-10-generic #1
[  500.226860] RIP: 0010:[<ffffffff80325bf2>]  [<ffffffff80325bf2>] strlen+0x2/0x20
[  500.226865] RSP: 0018:ffff81001f06bc38  EFLAGS: 00010246
[  500.226868] RAX: 0000000000000000 RBX: ffffffff880c0da0 RCX: ffff810016c8f000
[  500.226871] RDX: ffff81001d688a00 RSI: ffff810016c8f398 RDI: 0000000000000000
[  500.226873] RBP: ffffffff880ab01d R08: 0000000000000000 R09: 0000000000000000
[  500.226876] R10: 0000000000000001 R11: ffffffff802e7140 R12: ffff810016c8f398
[  500.226879] R13: ffffffff880c0e40 R14: ffffffff880c0ce0 R15: 0000000000000000
[  500.226882] FS:  0000000000000000(0000) GS:ffffffff80561000(0000) knlGS:0000000000000000
[  500.226885] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[  500.226887] CR2: 0000000000000000 CR3: 000000001aa2d000 CR4: 00000000000006e0
[  500.226891] Process khubd (pid: 2059, threadinfo ffff81001f06a000, task ffff81001d61f4a0)
[  500.226892] Stack:  ffffffff80391ff0 ffffffff880c0da0 ffff810016c8f388 ffff810016c8f398
[  500.226899]  ffffffff803921d1 ffff81001d2ae238 ffff810016c8f388 ffff810016c8f0e8
[  500.226903]  0000000000000246 ffffffff881575c0 0000000000000000 ffff81001d10d4d0
[  500.226907] Call Trace:
[  500.226914]  [<ffffffff80391ff0>] make_class_name+0x20/0x90
[  500.226925]  [<ffffffff803921d1>] class_device_del+0xc1/0x170
[  500.226946]  [<ffffffff80392289>] class_device_unregister+0x9/0x20
[  500.226973]  [<ffffffff880a3273>] :scsi_mod:__scsi_remove_device+0x43/0xa0
[  500.226998]  [<ffffffff880a02d1>] :scsi_mod:scsi_forget_host+0x61/0x80
[  500.227023]  [<ffffffff88099d91>] :scsi_mod:scsi_remove_host+0x61/0x100
[  500.227043]  [<ffffffff88147f90>] :usb_storage:storage_disconnect+0x10/0x20
[  500.227068]  [<ffffffff88060aad>] :usbcore:usb_unbind_interface+0x6d/0xd0
[  500.227085]  [<ffffffff80391552>] __device_release_driver+0x82/0xc0
[  500.227096]  [<ffffffff80391a78>] device_release_driver+0x38/0x60
[  500.227107]  [<ffffffff80390cc6>] bus_remove_device+0x76/0xb0
[  500.227118]  [<ffffffff8038ea1a>] device_del+0x1ba/0x2f0
[  500.227147]  [<ffffffff8805d971>] :usbcore:usb_disable_device+0x91/0x110
[  500.227172]  [<ffffffff880595db>] :usbcore:usb_disconnect+0xab/0x150
[  500.227206]  [<ffffffff88059d38>] :usbcore:hub_thread+0x2c8/0xda0
[  500.227251]  [<ffffffff8024b230>] autoremove_wake_function+0x0/0x30
[  500.227287]  [<ffffffff88059a70>] :usbcore:hub_thread+0x0/0xda0
[  500.227298]  [<ffffffff8024ae6b>] kthread+0x4b/0x80
[  500.227310]  [<ffffffff8020aca8>] child_rip+0xa/0x12
[  500.227348]  [<ffffffff8024ae20>] kthread+0x0/0x80
[  500.227354]  [<ffffffff8020ac9e>] child_rip+0x0/0x12
[  500.227365] 
[  500.227366] 
[  500.227367] Code: 80 3f 00 74 15 48 89 f8 66 0f 1f 44 00 00 48 83 c0 01 80 38 
[  500.227375] RIP  [<ffffffff80325bf2>] strlen+0x2/0x20
[  500.227379]  RSP <ffff81001f06bc38>
[  500.227381] CR2: 0000000000000000
[  500.227410] sd 7:0:0:0: scsi: Device offlined - not ready after error recovery
[  500.229818] sd 7:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
[  500.229823] end_request: I/O error, dev sdb, sector 0
[  500.229826] Buffer I/O error on device sdb, logical block 0
[  500.229862] Buffer I/O error on device sdb, logical block 0
[  500.229872] Buffer I/O error on device sdb, logical block 0
[  500.229880] Buffer I/O error on device sdb, logical block 0
[  500.229884] ldm_validate_partition_table(): Disk read failed.
[  500.229889] Buffer I/O error on device sdb, logical block 0
[  500.229895] Buffer I/O error on device sdb, logical block 0
[  500.229901] Buffer I/O error on device sdb, logical block 0
[  500.229907] Buffer I/O error on device sdb, logical block 0
[  500.229911] Dev sdb: unable to read RDB block 0
[  500.229916] Buffer I/O error on device sdb, logical block 0
[  500.229922] Buffer I/O error on device sdb, logical block 0
[  500.229947]  unable to read partition table
[  500.230010] sd 7:0:0:0: [sdb] Attached SCSI removable disk
[  500.230061] sd 7:0:0:0: Attached scsi generic sg2 type 0
[  500.341685] sd 7:0:0:0: [sdb] READ CAPACITY failed
[  500.341692] sd 7:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
[  500.341697] sd 7:0:0:0: [sdb] Sense not available.
[  500.342100] sd 7:0:0:0: [sdb] Write Protect is off
[  500.342104] sd 7:0:0:0: [sdb] Mode Sense: 00 00 00 00
[  500.342106] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[  500.342770] sd 7:0:0:0: [sdb] READ CAPACITY failed
[  500.342776] sd 7:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
[  500.342780] sd 7:0:0:0: [sdb] Sense not available.
[  500.343113] sd 7:0:0:0: [sdb] Write Protect is off
[  500.343117] sd 7:0:0:0: [sdb] Mode Sense: 00 00 00 00
[  500.343119] sd 7:0:0:0: [sdb] Assuming drive cache: write through