kern/52935: cat /dev/urandom crashes -current

[alnsn%NetBSD.org@localhost]

>Number:         52935
>Category:       kern
>Synopsis:       cat /dev/urandom crashes -current
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jan 20 22:45:00 +0000 2018
>Originator:     Alexander Nasonov
>Release:        NetBSD 8.99.12
>Organization:
	XMM SWAP LTD
>Environment:
NetBSD neva 8.99.12 NetBSD 8.99.12 (GENERIC_KASLR) #1: Sat Jan 20 13:30:24 GMT 2018  alnsn@neva:/home/alnsn/netbsd-current/clean/src/sys/arch/amd64/compile/obj/GENERIC_KASLR amd64
Architecture: x86_64
Machine: amd64
>Description:
Boot in single user mode (to minimise damage)
Run cat /dev/urandom
Boom:
panic: kernel diagnostic assertion "edp->state < __arraycount(vt100_output) - 1"
 failed: file "/path/to/src/sys/dev/wscons/wsemul_vt100.c", line 1009
>How-To-Repeat:
	See above
>Fix:
	Not known to me.

>Unformatted: