kern/45896: usb keyboard broken in ddb

[martin%NetBSD.org@localhost]

>Number:         45896
>Category:       kern
>Synopsis:       usb keyboard broken in ddb
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 31 14:30:01 +0000 2012
>Originator:     Martin Husemann
>Release:        NetBSD 5.99.62
>Organization:
The NetBSD Foundation, Inc.

>Environment:
System: NetBSD nelly.aprisoft.de 5.99.62 NetBSD 5.99.62 (NELLY.MP) #193: Tue 
Jan 31 09:19:40 CET 2012 
martin%emmas.aprisoft.de@localhost:/nelly/usr/src/sys/arch/sparc64/compile/NELLY.MP
 sparc64
Architecture: sparc64
Machine: sparc64
>Description:

After a panic, trying to type "bt" when using an USB keyboard may result
in something like:

Skipping crash dump on recursive panic
panic: kernel diagnostic assertion "KERNEL_LOCKDED_P()" failed: file: 
"...../dev/usb/usbdi.c", line 760

>How-To-Repeat:
s/a
>Fix:
make the predicate always succeed if panicstr != NULL ?