system lockup on interface deletion/addition

[bol-van]

branch v5.8.7
kernel 5.14.0
ubuntu 20.04

T:  Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  6 Spd=480 MxCh= 0
D:  Ver= 2.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=0bda ProdID=b812 Rev=02.10
S:  Manufacturer=Realtek
S:  Product=USB3.0 802.11ac 1200M Adapter
S:  SerialNumber=123456
C:  #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA
I:  If#=0x0 Alt= 0 #EPs= 5 Cls=ff(vend.) Sub=ff Prot=ff Driver=rtl88x2bu

Attempt to
iw dev wlan1 del
iw phy phy1 interface add type monitor
lead to command hang and then many other processes also hang so reboot is required
for example :
iw phy (hang)
rmmod 88x2bu (hang)
ping 1.1.1.1 (hang)

[moham96]

same problem here on archlinux