[  668.997100] Bluetooth: Failed to register connection device
[  711.218567] ------------[ cut here ]------------
[  711.218660] WARNING: at fs/sysfs/dir.c:455 sysfs_add_one+0xa0/0xc8()
[  711.218720] sysfs: cannot create duplicate filename '/class/bluetooth/hci0:42'
[  711.218768] Modules linked in: bnep rfcomm aes_generic ecb btusb bluetooth snd_bcm2835 snd_pcm snd_seq snd_timer snd_seq_device snd snd_page_alloc joydev evdev
[  711.219170] [<c00153d4>] (unwind_backtrace+0x0/0xfc) from [<c03f9598>] (dump_stack+0x20/0x24)
[  711.219275] [<c03f9598>] (dump_stack+0x20/0x24) from [<c002d828>] (warn_slowpath_common+0x5c/0x74)
[  711.219434] [<c002d828>] (warn_slowpath_common+0x5c/0x74) from [<c002d8fc>] (warn_slowpath_fmt+0x40/0x48)
[  711.219503] [<c002d8fc>] (warn_slowpath_fmt+0x40/0x48) from [<c015d924>] (sysfs_add_one+0xa0/0xc8)
[  711.219571] [<c015d924>] (sysfs_add_one+0xa0/0xc8) from [<c015e2f8>] (sysfs_do_create_link+0x148/0x238)
[  711.219632] [<c015e2f8>] (sysfs_do_create_link+0x148/0x238) from [<c015e404>] (sysfs_create_link+0x1c/0x20)
[  711.219701] [<c015e404>] (sysfs_create_link+0x1c/0x20) from [<c029b454>] (device_add+0x29c/0x5a4)
[  711.219934] [<c029b454>] (device_add+0x29c/0x5a4) from [<bf0b79f0>] (add_conn+0x48/0x188 [bluetooth])
[  711.220108] [<bf0b79f0>] (add_conn+0x48/0x188 [bluetooth]) from [<c0049208>] (process_one_work+0x154/0x480)
[  711.220206] [<c0049208>] (process_one_work+0x154/0x480) from [<c004bf40>] (worker_thread+0x168/0x3ac)
[  711.220279] [<c004bf40>] (worker_thread+0x168/0x3ac) from [<c0050b54>] (kthread+0x98/0xa0)
[  711.220357] [<c0050b54>] (kthread+0x98/0xa0) from [<c000f1dc>] (kernel_thread_exit+0x0/0x8)
[  711.220428] ---[ end trace 3016cda796f819e0 ]---