kobject_add_internal failed for hci3:200 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci3: failed to register connection device
==================================================================
BUG: KASAN: slab-out-of-bounds in bacpy include/net/bluetooth/bluetooth.h:274 [inline]
BUG: KASAN: slab-out-of-bounds in hci_extended_inquiry_result_evt net/bluetooth/hci_event.c:4397 [inline]
BUG: KASAN: slab-out-of-bounds in hci_event_packet+0x6c7/0x18260 net/bluetooth/hci_event.c:6127
Read of size 6 at addr ffff8880a2012606 by task kworker/u5:0/1530

CPU: 0 PID: 1530 Comm: kworker/u5:0 Not tainted 5.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci3 hci_rx_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 print_address_description+0x66/0x5a0 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:183 [inline]
 check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192
 memcpy+0x25/0x60 mm/kasan/common.c:105
 bacpy include/net/bluetooth/bluetooth.h:274 [inline]
 hci_extended_inquiry_result_evt net/bluetooth/hci_event.c:4397 [inline]
 hci_event_packet+0x6c7/0x18260 net/bluetooth/hci_event.c:6127
 hci_rx_work+0x236/0x9c0 net/bluetooth/hci_core.c:4705
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Allocated by task 28369:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xde/0x4f0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:377 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline]
 vhci_write+0xb7/0x400 drivers/bluetooth/hci_vhci.c:285
 call_write_iter include/linux/fs.h:1908 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0xa08/0xc70 fs/read_write.c:578
 ksys_write+0x11b/0x220 fs/read_write.c:631
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 27182:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x220 mm/slab.c:3757
 rcu_do_batch kernel/rcu/tree.c:2414 [inline]
 rcu_core+0x816/0x1120 kernel/rcu/tree.c:2641
 __do_softirq+0x268/0x80c kernel/softirq.c:292

The buggy address belongs to the object at ffff8880a2012400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 6 bytes to the right of
 512-byte region [ffff8880a2012400, ffff8880a2012600)
The buggy address belongs to the page:
page:ffffea0002880480 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00029cf288 ffffea0002a12bc8 ffff8880aa400a80
raw: 0000000000000000 ffff8880a2012000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a2012500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a2012580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a2012600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8880a2012680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a2012700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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