Comment 4 for bug 228746

From Brunellus' attachment:

[ 82.204035] usb 1-6: reset high speed USB device using ehci_hcd and address 8
[ 82.260071] scsi 10:0:0:1: Device offlined - not ready after error recovery
[ 82.260175] usb 1-6: USB disconnect, address 8
[ 82.262702] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[ 82.262708] IP: [<ffffffff804346d9>] device_pm_remove+0x39/0x60
[ 82.262717] PGD 0
[ 82.262720] Oops: 0002 [1] SMP
[ 82.262723] CPU 1
[ 82.262725] Modules linked in: af_packet binfmt_misc bridge stp bnep sco rfcomm l2cap bluetooth ppdev cpufreq_powersave cpufreq_ondemand cpufreq_stats cpufreq_userspace freq_table cpufreq_conservative container video output wmi sbs pci_slot sbshc battery iptable_filter ip_tables x_tables ac sbp2 lp k8temp pcspkr evdev nvidia(P) gspca_spca561 gspca_main compat_ioctl32 videodev v4l1_compat shpchp pci_hotplug snd_ice1724 snd_ice17xx_ak4xxx snd_ac97_codec ac97_bus snd_ak4xxx_adda snd_ak4114 snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_pt2258 snd_i2c snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device parport_pc parport snd soundcore button i2c_nforce2 i2c_core ext3 jbd mbcache sr_mod cdrom sd_mod crc_t10dif sg usbhid hid usb_storage libusual ata_generic pata_amd sata_nv pata_acpi ohci1394 ohci_hcd ieee1394 libata scsi_mod forcedeth ehci_hcd dock usbcore thermal processor fan fbcon tileblit font bitblit softcursor fuse
[ 82.262789] Pid: 1319, comm: khubd Tainted: P 2.6.27-9-generic #1
[ 82.262792] RIP: 0010:[<ffffffff804346d9>] [<ffffffff804346d9>] device_pm_remove+0x39/0x60
[ 82.262796] RSP: 0018:ffff880037555aa0 EFLAGS: 00010286
[ 82.262799] RAX: 0000000000000000 RBX: ffff88007d403368 RCX: ffff88007d403510
[ 82.262801] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffffff80673da0
[ 82.262803] RBP: ffff880037555ab0 R08: 00000000ffffffff R09: 000000168d25073e
[ 82.262805] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88007d403368
[ 82.262808] R13: 0000000000000246 R14: ffff88007d403120 R15: ffffffffa0173168
[ 82.262811] FS: 00007f296006d770(0000) GS:ffff88007f802880(0000) knlGS:0000000000000000
[ 82.262813] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 82.262815] CR2: 0000000000000008 CR3: 0000000000201000 CR4: 00000000000006e0
[ 82.262818] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 82.262820] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 82.262823] Process khubd (pid: 1319, threadinfo ffff880037554000, task ffff8800375159c0)
[ 82.262825] Stack: ffff88007d403864 ffff88007d403368 ffff880037555ae0 ffffffff8042d8df
[ 82.262830] ffff88007d403368 ffff88007d403120 0000000000000246 ffff88007d403800
[ 82.262834] ffff880037555b00 ffffffff8042dac6 ffff88007d403800 ffff88007d403000
[ 82.262838] Call Trace:
[ 82.262843] [<ffffffff8042d8df>] device_del+0x1f/0x1f0
[ 82.262846] [<ffffffff8042dac6>] device_unregister+0x16/0x30
[ 82.262867] [<ffffffffa00af60b>] __scsi_remove_device+0x4b/0xa0 [scsi_mod]
[ 82.262880] [<ffffffffa00abc92>] scsi_forget_host+0x72/0x80 [scsi_mod]
[ 82.262894] [<ffffffffa00a3dd1>] scsi_remove_host+0x71/0x130 [scsi_mod]
[ 82.262902] [<ffffffffa0163326>] quiesce_and_remove_host+0x76/0xd0 [usb_storage]
[ 82.262908] [<ffffffffa016346d>] storage_disconnect+0x1d/0x30 [usb_storage]
[ 82.262934] [<ffffffffa0058b4a>] usb_unbind_interface+0x6a/0x140 [usbcore]
[ 82.262940] [<ffffffff80430212>] __device_release_driver+0xa2/0xe0
[ 82.262944] [<ffffffff80430360>] device_release_driver+0x30/0x50
[ 82.262948] [<ffffffff8042f65d>] bus_remove_device+0xad/0xf0
[ 82.262951] [<ffffffff8042d9f0>] device_del+0x130/0x1f0
[ 82.262964] [<ffffffffa00557d5>] usb_disable_device+0xa5/0x130 [usbcore]
[ 82.262977] [<ffffffffa0050d5c>] usb_disconnect+0xbc/0x180 [usbcore]
[ 82.262991] [<ffffffffa00513d6>] hub_port_connect_change+0x1c6/0xad0 [usbcore]
[ 82.263004] [<ffffffffa00564c4>] ? usb_control_msg+0xf4/0x110 [usbcore]
[ 82.263018] [<ffffffffa00520f3>] hub_events+0x2e3/0x650 [usbcore]
[ 82.263031] [<ffffffffa00524a5>] hub_thread+0x45/0x190 [usbcore]
[ 82.263038] [<ffffffff80267050>] ? autoremove_wake_function+0x0/0x40
[ 82.263051] [<ffffffffa0052460>] ? hub_thread+0x0/0x190 [usbcore]
[ 82.263055] [<ffffffff80266c1e>] kthread+0x4e/0x90
[ 82.263060] [<ffffffff80213c99>] child_rip+0xa/0x11
[ 82.263062] [<ffffffff80266bd0>] ? kthread+0x0/0x90
[ 82.263065] [<ffffffff80213c8f>] ? child_rip+0x0/0x11
[ 82.263067]
[ 82.263068]
[ 82.263069] Code: 48 89 fb 48 c7 c7 a0 3d 67 80 e8 b3 ca 0c 00 48 8b 93 a8 01 00 00 48 8b 83 b0 01 00 00 48 8d 8b a8 01 00 00 48 c7 c7 a0 3d 67 80 <48> 89 42 08 48 89 10 48 89 8b b0 01 00 00 48 89 8b a8 01 00 00
[ 82.263095] RIP [<ffffffff804346d9>] device_pm_remove+0x39/0x60
[ 82.263099] RSP <ffff880037555aa0>
[ 82.263101] CR2: 0000000000000008
[ 82.263110] ---[ end trace 82a9f61719c0b0a2 ]---