kern/54241: urndis gives up easily

[coypu%sdf.org@localhost]

>Number:         54241
>Category:       kern
>Synopsis:       urndis gives up easily
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 28 20:15:00 +0000 2019
>Originator:     coypu
>Release:        NetBSD 8.99.41
>Organization:
>Environment:
NetBSD plu 8.99.41 NetBSD 8.99.41 (GENERIC) #0: Thu May 23 18:48:19 IDT 2019  fly@plu:/home/fly/obj/sys/arch/amd64/compile/GENERIC amd64

>Description:
Attempt to use urndis on (apparently) imperfect connection:

May 28 23:00:59 plu /netbsd: [ 886.4536486] urndis0 at uhub1 port 1 configuration 1 interface 0
May 28 23:00:59 plu /netbsd: [ 886.4536486] urndis0: Android (0x4e8) Android (0x6863), rev 2.00/2.26, addr 45
May 28 23:00:59 plu /netbsd: [ 886.4536486] urndis0: address 3e:4c:0e:39:2f:78
May 28 23:01:25 plu /netbsd: [ 912.2701719] urndis0: usb errors on rx: IOERROR
May 28 23:01:25 plu /netbsd: [ 912.2801860] urndis0: detached
May 28 23:01:25 plu /netbsd: [ 912.2701719] urndis0: usb errors on rx: ddr 45) disconnected
May 28 23:01:26 plu /netbsd: [ 913.2014892] urndis0 at uhub1 port 1 configuration 1 interface 0
May 28 23:01:26 plu /netbsd: [ 913.2014892] urndis0: Android (0x4e8) Android (0x6863), rev 2.00/2.26, addr 46
May 28 23:01:31 plu /netbsd: [ 913.2014892] urndis0: IOERROR
May 28 23:01:31 plu /netbsd: [ 913.2014892] urndis0: unable to get init response
May 28 23:01:31 plu /netbsd: [ 918.2085729] urndis0: TIMEOUT
May 28 23:01:31 plu /netbsd: [ 918.2085729] urndis0: query failed
May 28 23:01:31 plu /netbsd: [ 918.2085729] autoconfiguration error: urndis0: unable to get hardware address
May 28 23:01:44 plu /netbsd: [ 930.9465943] urndis0: detached
May 28 23:01:44 plu /netbsd: [ 930.9465943] urndis0: at uhub1 port 1 (addr 46) disconnected
May 28 23:01:45 plu /netbsd: [ 931.8779114] urndis0 at uhub1 port 1 configuration 1 interface 0
May 28 23:01:45 plu /netbsd: [ 931.8779114] urndis0: Android (0x4e8) Android (0x6863), rev 2.00/2.26, addr 47
May 28 23:01:45 plu /netbsd: [ 931.8779114] urndis0: usb errors on rx: IOERROR
May 28 23:01:45 plu /netbsd: [ 931.8779114] urndis0: address 3e:4c:0e:39:2f:78


The frequent detaches also lead to panics:

System panicked: kernel diagnostic assertion "ipq != NULL" failed: file "/cvs/src/sys/net/if.c", line 899

It's not viable as a network connection on my machine, since connections are often dropped on detach.
>How-To-Repeat:

>Fix: