Bug 892935

Description of problem:
I was performing step 5 of installing de packs for connection between Fedora 17 and Samsung Galaxy SIII Android:
mounting de device, using this command "# jmtpfs -o allow_other ~/Samsung_Galaxy_S3" 
site refference --> http://forums.fedoraforum.org/showthread.php?t=284741


Additional info:
libreport version: 2.0.18
abrt_version:   2.0.18
cmdline:        BOOT_IMAGE=/vmlinuz-3.6.7-4.fc17.x86_64 root=/dev/mapper/vg_fedorastilgar-lv_root ro rd.md=0 rd.dm=0 KEYTABLE=us SYSFONT=True rd.luks=0 rd.lvm.lv=vg_fedorastilgar/lv_root rd.lvm.lv=vg_fedorastilgar/lv_swap LANG=en_US.UTF-8 rhgb quiet
kernel:         3.6.7-4.fc17.x86_64

backtrace:
:BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
:IP: [<ffffffff81466be3>] xhci_free_dev+0x63/0x160
:PGD 120fd7067 PUD 12007c067 PMD 0 
:Oops: 0002 [#1] SMP 
:Modules linked in: cdc_acm fuse bnep bluetooth ip6t_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables binfmt_misc uvcvideo arc4 ath9k snd_hda_codec_hdmi ath9k_common videobuf2_vmalloc videobuf2_memops videobuf2_core videodev ath9k_hw snd_hda_codec_realtek media snd_hda_intel ath coretemp snd_seq snd_hda_codec kvm_intel mac80211 kvm snd_seq_device iTCO_wdt iTCO_vendor_support snd_hwdep snd_pcm snd_page_alloc snd_timer snd soundcore cfg80211 asus_nb_wmi asus_wmi microcode i2c_i801 lpc_ich mei atl1c sparse_keymap rfkill mfd_core serio_raw uinput crc32c_intel ghash_clmulni_intel wmi video radeon i2c_algo_bit drm_kms_helper ttm drm i2c_core
:CPU 0 
:Pid: 33, comm: khubd Not tainted 3.6.7-4.fc17.x86_64 #1 ASUSTeK Computer Inc. K54HR/K54HR
:RIP: 0010:[<ffffffff81466be3>]  [<ffffffff81466be3>] xhci_free_dev+0x63/0x160
:RSP: 0018:ffff880138edbd60  EFLAGS: 00010246
:RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
:RDX: ffff880138eec000 RSI: ffff880116a69000 RDI: ffff880134ad4600
:RBP: ffff880138edbda0 R08: 0000000000000001 R09: ffffffff8186f04c
:R10: 0000000000000000 R11: 0000000000000457 R12: 0000000000000000
:R13: ffff880116a69000 R14: ffff880138eec000 R15: 0000000000000040
:FS:  0000000000000000(0000) GS:ffff88013f400000(0000) knlGS:0000000000000000
:CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
:CR2: 0000000000000040 CR3: 00000001200b2000 CR4: 00000000000407f0
:DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
:DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
:Process khubd (pid: 33, threadinfo ffff880138eda000, task ffff880138de4530)
:Stack:
: ffff880134b00000 ffff880134ad4600 00000000ffffff00 0000000000000001
: ffff880134b00000 ffff880116a69000 00000000ffffff00 ffff880134ad4800
: ffff880138edbee0 ffffffff8143723a ffff880138cb7058 0000000200000000
:Call Trace:
: [<ffffffff8143723a>] hub_thread+0x8ea/0x1740
: [<ffffffff810807f0>] ? wake_up_bit+0x40/0x40
: [<ffffffff81436950>] ? usb_remote_wakeup+0x70/0x70
: [<ffffffff8107fde3>] kthread+0x93/0xa0
: [<ffffffff81627e04>] kernel_thread_helper+0x4/0x10
: [<ffffffff8107fd50>] ? kthread_freezable_should_stop+0x70/0x70
: [<ffffffff81627e00>] ? gs_change+0x13/0x13
:Code: ff ff 83 f8 ed 0f 85 e5 00 00 00 49 63 85 b8 04 00 00 31 db 4d 8b a4 c6 10 01 00 00 4d 8d 7c 24 40 0f 1f 80 00 00 00 00 48 63 c3 <41> 83 27 fb 83 c3 01 48 69 c0 e8 00 00 00 49 81 c7 e8 00 00 00 
:RIP  [<ffffffff81466be3>] xhci_free_dev+0x63/0x160
: RSP <ffff880138edbd60>
:CR2: 0000000000000040