kern/47817: procfs related panic

[nick@zoom.localdomain]

>Number:         47817
>Category:       kern
>Synopsis:       procfs related panic
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 15 08:10:01 +0000 2013
>Originator:     Nick Hudson
>Release:        NetBSD 6.99.19
>Organization:
        N/A
>Environment:
System: NetBSD zoom 6.99.19 NetBSD 6.99.19 (GENERIC) #3: Sun May 5 11:38:19 BST 
2013 nick@zoom:/wrk/obj/amd64/usr/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:

panic: kernel diagnostic assertion "vp->v_usecount != 0" failed: file 
"/usr/src/sys/kern/vfs_vnode.c", line 924 
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x136
kern_assert() at netbsd:kern_assert+0x48
vref() at netbsd:vref+0x7e
getcwd_common() at netbsd:getcwd_common+0x6a
procfs_dir.clone.0() at netbsd:procfs_dir.clone.0+0xcd
procfs_readlink() at netbsd:procfs_readlink+0x172
VOP_READLINK() at netbsd:VOP_READLINK+0x37
namei_tryemulroot() at netbsd:namei_tryemulroot+0x965
namei() at netbsd:namei+0x2b
fd_nameiat.clone.0() at netbsd:fd_nameiat.clone.0+0x54
do_sys_accessat() at netbsd:do_sys_accessat+0xbd
syscall() at netbsd:syscall+0x94
--- syscall (number 33) ---
7f7ff3eacd9a:

>How-To-Repeat:
        Do stuff.

>Fix:
        yes please.