kern/38596: mounting a null filesystem causes a panic

[bjs%NetBSD.org@localhost]

>Number:         38596
>Category:       kern
>Synopsis:       mounting a null filesystem causes a panic
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 06 07:35:01 +0000 2008
>Originator:     Blair Sadewitzs
>Release:        4.99.62
>Organization:
The NetBSD Foundation
>Environment:
NetBSD/amd64 4.99.62
>Description:
Upon mounting a null mount, the system panics due to an already-held rwlock 
("locking against myself").  This can be reliably
reproduced.
>How-To-Repeat:
Attempt to mount a null mount.
>Fix:
None thusfar. :(