port-xen/53569: wskbd double attach with DIAGNOSTIC xen kernel NetBSD-8.0_STABLE

[oster%netbsd.org@localhost]

>Number:         53569
>Category:       port-xen
>Synopsis:       wskbd double attaches with xen on NetBSD-8.0_STABLE
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-xen-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Sep 02 20:40:00 +0000 2018
>Originator:     Greg Oster
>Release:        NetBSD 8.0_STABLE
>Organization:
>Environment:
	
	
System: NetBSD thog 8.0_STABLE NetBSD 8.0_STABLE (THOG.gdb) #0: Sat Sep 1 11:17:06 CST 2018 oster@thog:/u1/builds/build187/src/obj/amd64/u1/builds/build187/src/sys/arch/amd64/compile/XEN3_DOM0.gdb amd64
Architecture: x86_64
Machine: amd64
>Description:

With DIAGNOSTIC turned on for XEN3_DOM0 kernel build, the following
panic is encountered:

...
ukbd0 at uhidev0: 8 Variable keys. 6 Array codes
panic: kernel diagnostic assertion "!wskbd_console_initted" failed: file
"/u1/builds/build187/src/sys/dev/wscons/wskbd.c", line 540
fatal breakpoint trap in supervisor mode
...


>How-To-Repeat:

Build a XEN3_DOM0 with DIAGNOSTIC turned on.  Perhaps have a USB keyboard 
plugged in?

>Fix:

Looks like an attempt to double-attach, but there was only one USB keyboard
ever hooked up.