Ubuntu 18.10
Bluez Version: 5.50-0ubuntu1

After changing batteries in my bluetooth mouse, it is connected but
doesn't work (no movement or clicking). Fix is to re-pair it.

~$ dmesg | tail -40
[12650.520061]  sysfs_warn_dup.cold.4+0x17/0x32
[12650.520064]  sysfs_create_dir_ns+0xa9/0xd0
[12650.520067]  kobject_add_internal+0xac/0x260
[12650.520071]  ? kvasprintf+0x7f/0xd0
[12650.520073]  kobject_add+0x7d/0xb0
[12650.520076]  device_add+0x128/0x650
[12650.520092]  hci_conn_add_sysfs+0x4b/0xc0 [bluetooth]
[12650.520106]  hci_conn_complete_evt.isra.47+0xc7/0x400 [bluetooth]
[12650.520109]  ? __switch_to_asm+0x34/0x70
[12650.520123]  hci_event_packet+0x1670/0x27d0 [bluetooth]
[12650.520124]  ? __switch_to_asm+0x40/0x70
[12650.520126]  ? __switch_to_asm+0x34/0x70
[12650.520127]  ? __switch_to_asm+0x40/0x70
[12650.520129]  ? __switch_to_asm+0x34/0x70
[12650.520130]  ? __switch_to_asm+0x40/0x70
[12650.520132]  ? __switch_to_asm+0x40/0x70
[12650.520144]  hci_rx_work+0x190/0x380 [bluetooth]
[12650.520148]  ? __schedule+0x2a6/0x840
[12650.520153]  process_one_work+0x20f/0x410
[12650.520156]  worker_thread+0x34/0x400
[12650.520159]  kthread+0x120/0x140
[12650.520162]  ? pwq_unbound_release_workfn+0xd0/0xd0
[12650.520164]  ? kthread_bind+0x40/0x40
[12650.520165]  ret_from_fork+0x35/0x40
[12650.520168] kobject_add_internal failed for hci0:11 with -EEXIST, don't try 
to register things with the same name in the same directory.
[12650.520172] Bluetooth: hci0: failed to register connection device
[12650.582899] kobject_add_internal failed for 0005:05AC:030D.0008 (error: -2 
parent: hci0:11)
[12651.761999] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12667.896097] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12684.202210] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12688.792774] audit: type=1107 audit(1552483496.482:112): pid=1858 uid=105 
auid=4294967295 ses=4294967295 subj==unconfined msg='apparmor="DENIED" 
operation="dbus_method_call"  bus="system" 
path="/org/freedesktop/NetworkManager" 
interface="org.freedesktop.NetworkManager" member="GetDevices" mask="send" 
name="org.freedesktop.NetworkManager" pid=4519 label="snap.chromium.chromium" 
peer_pid=2026 peer_label="unconfined"
                exe="/usr/bin/dbus-daemon" sauid=105 hostname=? addr=? 
terminal=?'
[12699.892349] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12716.204418] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12732.080523] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12747.954625] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12764.078740] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12779.952841] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12796.084949] Bluetooth: hci0: last event is not cmd complete (0x0f)
[12812.215051] Bluetooth: hci0: last event is not cmd complete (0x0f)

~$ dpkg --status bluez | grep '^Version:'
Version: 5.50-0ubuntu1

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https://bugs.launchpad.net/bugs/1818140

Title:
  [Dell DW1560 / BCM20702A1] kobject_add_internal failed for hci0:11
  with --EEXIST, don't try to register things with the same name in the
  same directory

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