The bug is present on my system.
It was temporarily solved with workaround from https://dev.solus-project.com/T5224, but I don't use Bluetooth and so don't know if it is now working.

* Infos from uname
Linux 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:15:38 UTC 2018 i686 i686 i686 GNU/Linux
Ubuntu 4.15.0-20.21-generic 4.15.17

* From dmidecode
System Information
	Manufacturer: Dell Inc.
	Product Name: Vostro 3700
	Version: A10

Base Board Information
	Manufacturer: Dell Inc.
	Product Name: 07VWR8
	Version: A10
	Features:
		Board is a hosting board
		Board is replaceable
	Type: Motherboard

OEM Strings
	String 1: Dell System
	String 2: 5[0003]
	String 3: 13[PP41L]

BIOS Information
	Vendor: Dell Inc.
	Version: A10
	Release Date: 10/25/2010
	Address: 0xF0000
	Runtime Size: 64 kB
	ROM Size: 2048 kB
	Characteristics:
		MCA is supported
		PCI is supported
		BIOS is upgradeable
		BIOS shadowing is allowed
		ESCD support is available
		Boot from CD is supported
		Selectable boot is supported
		BIOS ROM is socketed
		EDD is supported
		5.25"/1.2 MB floppy services are supported (int 13h)
		3.5"/720 kB floppy services are supported (int 13h)
		3.5"/2.88 MB floppy services are supported (int 13h)
		Print screen service is supported (int 5h)
		8042 keyboard services are supported (int 9h)
		Serial services are supported (int 14h)
		Printer services are supported (int 17h)
		CGA/mono video services are supported (int 10h)
		ACPI is supported
		USB legacy is supported
		ATAPI Zip drive boot is supported
		BIOS boot specification is supported
		Targeted content distribution is supported
	BIOS Revision: 1.254
	Firmware Revision: 1.254

* From /sys/kernel/debug/usb/devices
T:  Bus=01 Lev=03 Prnt=03 Port=02 Cnt=03 Dev#=  7 Spd=12   MxCh= 0
D:  Ver= 2.00 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=413c ProdID=8160 Rev= 1.73
S:  Manufacturer=Dell Computer Corp
S:  Product=Dell Wireless 365 Bluetooth Module
C:* #Ifs= 4 Cfg#= 1 Atr=e0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=81(I) Atr=03(Int.) MxPS=  16 Ivl=1ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=   0 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=   0 Ivl=1ms
I:  If#= 1 Alt= 1 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=   9 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=   9 Ivl=1ms
I:  If#= 1 Alt= 2 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  17 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  17 Ivl=1ms
I:  If#= 1 Alt= 3 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  32 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  32 Ivl=1ms
I:  If#= 1 Alt= 4 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  64 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  64 Ivl=1ms
I:  If#= 1 Alt= 5 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  64 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  64 Ivl=1ms
I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E:  Ad=84(I) Atr=02(Bulk) MxPS=  32 Ivl=0ms
E:  Ad=04(O) Atr=02(Bulk) MxPS=  32 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 0 Cls=fe(app. ) Sub=01 Prot=00 Driver=(none)

* From udevadm
UDEV  [947.284638] unbind   /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0 (usb)
KERNEL[947.289860] bind     /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0 (usb)
KERNEL[947.290052] unbind   /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0 (usb)

* From journalctl
mag 18 17:07:42 upowerd[10489]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0
mag 18 17:07:42 systemd-udevd[323]: Process 'hid2hci --method=dell  --devpath=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0' failed with exit code 1.
mag 18 17:07:42 upowerd[10489]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0

* From systemd-udevd
'hid2hci --method=dell --devpath=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0'(err) 'error: switching device '/sys//devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0' failed.'

* From /proc/modules
btusb 40960 0 - Live 0xf8ae7000
btrtl 16384 1 btusb, Live 0xf8957000
btbcm 16384 1 btusb, Live 0xf88ea000
btintel 16384 1 btusb, Live 0xf88c4000
bluetooth 466944 31 rfcomm,bnep,btusb,btrtl,btbcm,btintel, Live 0xf8f77000
ecdh_generic 28672 1 bluetooth, Live 0xf88ef000

* From /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/product
BCM2046B1

* From /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/uevent
MAJOR=189
MINOR=2
DEVNAME=bus/usb/001/003
DEVTYPE=usb_device
DRIVER=usb
PRODUCT=a5c/4500/100
TYPE=9/0/0
BUSNUM=001
DEVNUM=003

* From /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/version
 2.00

* From /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/uevent
MAJOR=189
MINOR=5
DEVNAME=bus/usb/001/006
DEVTYPE=usb_device
DRIVER=usb
PRODUCT=413c/8162/100
TYPE=0/0/0
BUSNUM=001
DEVNUM=006

* From /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0/uevent
DEVTYPE=usb_interface
PRODUCT=413c/8162/100
TYPE=0/0/0
INTERFACE=3/1/2
MODALIAS=usb:v413Cp8162d0100dc00dsc00dp00ic03isc01ip02in00